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Document and Entity Information - shares	9 Months Ended
Document and Entity Information - shares	Sep. 30, 2013	Nov. 06, 2013
Document Information [Line Items]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Sep. 30, 2013
Document Fiscal Year Focus	2013
Document Fiscal Period Focus	Q3
Trading Symbol	PKG
Entity Registrant Name	PACKAGING CORP OF AMERICA
Entity Central Index Key	0000075677
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		98,075,901

Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Sep. 30, 2013	Dec. 31, 2012
Current assets:
Cash and cash equivalents	$ 396,595	$ 207,393
Accounts receivable, net of allowance for doubtful accounts and customer deductions of $6,795 and $5,353 as of September 30, 2013 and December 31, 2012, respectively	409,725	352,142
Inventories	266,892	268,767
Prepaid expenses and other current assets	31,478	20,915
Federal and state income taxes receivable	9,424	65,488
Deferred income taxes	21,814	22,328
Total current assets	1,135,928	937,033
Property, plant and equipment, net	1,369,053	1,366,069
Goodwill	67,160	67,160
Other intangible assets, net	35,742	38,283
Other long-term assets	49,226	45,223
Total assets	2,657,109	2,453,768
Current liabilities:
Current maturities of long-term debt	15,000	15,000
Capital lease obligations	1,013	964
Accounts payable	163,928	117,510
Dividends payable	39,261
Accrued interest	5,131	3,676
Accrued liabilities	129,569	122,696
Total current liabilities	353,902	259,846
Long-term liabilities:
Long-term debt	767,411	778,630
Capital lease obligations	24,138	24,904
Deferred income taxes	144,332	125,109
Pension and postretirement benefit plans	132,486	164,538
Cellulosic biofuel tax reserve	102,051	102,051
Other long-term liabilities	33,661	29,229
Total long-term liabilities	1,204,079	1,224,461
Stockholders' equity:
Common stock, par value $0.01 per share, 300,000,000 shares authorized, 98,073,901 and 98,142,782 shares issued as of September 30, 2013 and December 31, 2012, respectively	981	981
Additional paid in capital	396,557	378,794
Retained earnings	787,684	703,728
Accumulated other comprehensive loss, net of tax:
Unfunded employee benefit obligations	(56,660)	(81,999)
Total accumulated other comprehensive loss	(86,094)	(114,042)
Total stockholders' equity	1,099,128	969,461
Total liabilities and stockholders' equity	2,657,109	2,453,768
Accumulated Net Gain (Loss) From Designated Or Qualifying Cash Flow Hedges \| Treasury Lock
Accumulated other comprehensive loss, net of tax:
Unrealized loss	(29,057)	(31,651)
Total accumulated other comprehensive loss	(29,057)	(31,651)
Accumulated Net Gain (Loss) From Designated Or Qualifying Cash Flow Hedges \| Foreign Exchange Contract
Accumulated other comprehensive loss, net of tax:
Unrealized loss	(377)	(392)
Total accumulated other comprehensive loss	$ (377)	$ (392)

Condensed Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Sep. 30, 2013	Dec. 31, 2012
Allowance for doubtful accounts and customer deductions	$ 6,795	$ 5,353
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	300,000,000	300,000,000
Common stock, shares issued	98,073,901	98,142,782

Condensed Consolidated Statements of Income and Comprehensive Income - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Net sales	$ 845,440	$ 723,473	$ 2,400,877	$ 2,107,298
Cost of sales	(619,626)	(560,921)	(1,800,509)	(1,641,619)
Gross profit	225,814	162,552	600,368	465,679
Selling and administrative expenses	(56,469)	(51,529)	(167,009)	(156,339)
Corporate overhead	(21,143)	(16,990)	(59,852)	(51,614)
Alternative fuel mixture credits				95,500
Other expense, net	(6,242)	(1,961)	(21,031)	(8,186)
Income from operations	141,960	92,072	352,476	345,040
Interest expense, net	(11,850)	(30,590)	(30,333)	(53,529)
Income before taxes	130,110	61,482	322,143	291,511
Provision for income taxes	(45,930)	(21,691)	(112,885)	(188,722)
Net income	$ 84,180	$ 39,791	$ 209,258	$ 102,789
Weighted average common shares outstanding:
Basic	96,758	96,360	96,536	96,408
Diluted	97,597	97,349	97,512	97,520
Net income per common share:
Basic	$ 0.87	$ 0.41	$ 2.17	$ 1.07
Diluted	0.86	0.41	2.15	1.05
Dividends declared per common share	$ 0.40	$ 0.25	$ 1.1125	$ 0.7500
Net income	$ 84,180	$ 39,791	$ 209,258	$ 102,789
Other comprehensive income (loss), net of tax:
Fair value adjustments to cash flow hedges				(10,183)
Reclassification adjustment for cash flow hedges included in net income	870	(605)	2,609	977
Amortization of pension and postretirement plans actuarial loss and prior service cost	3,387	1,672	11,921	5,016
Unfunded employee benefit obligations	4,963		13,418
Other comprehensive income	9,220	1,067	27,948	(4,190)
Comprehensive income	$ 93,400	$ 40,858	$ 237,206	$ 98,599

Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012
Cash Flows from Operating Activities:
Net income	$ 209,258	$ 102,789
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation, depletion and amortization	129,838	127,994
Amortization of financing costs	3,332	912
Amortization of net loss on treasury lock	4,242	1,574
Share-based compensation expense	9,956	8,477
Deferred income tax provision	3,604	173,696
Alternative fuel mixture credits	76,280	(72,436)
Loss on disposals of property, plant and equipment	5,147	4,668
Loss on early extinguishment of debt		21,296
Pension and postretirement benefits	10,600	(7,775)
Other, net	(496)	(3,354)
(Increase) decrease in assets -
Accounts receivable	(57,583)	(52,528)
Inventories	1,875	(4,217)
Prepaid expenses and other current assets	(9,196)	(8,587)
Increase (decrease) in liabilities -
Accounts payable	46,418	(10,650)
Accrued liabilities	(13,107)	(30,048)
Net cash provided by operating activities	420,168	251,811
Cash Flows from Investing Activities:
Additions to property, plant and equipment	(130,410)	(94,396)
Acquisition of business		(35,393)
Treasury grant proceeds		57,399
Additions to other long term assets	(2,459)	(1,181)
Proceeds from disposals of property, plant and equipment	350	25
Net cash used for investing activities	(132,519)	(73,546)
Cash Flows from Financing Activities:
Proceeds on long-term debt		397,044
Payments on long-term debt	(11,967)	(433,202)
Financing costs paid	(8,220)	(821)
Settlement of treasury lock		(65,500)
Common stock dividends paid	(69,883)	(68,776)
Repurchases of common stock	(7,799)	(41,524)
Proceeds from exercise of stock options	2,756	16,121
Excess tax benefits from share-based awards	7,539	2,986
Shares withheld to cover employee restricted stock taxes	(10,873)
Net cash used for financing activities	(98,447)	(193,672)
Net increase (decrease) in cash and cash equivalents	189,202	(15,407)
Cash and cash equivalents, beginning of period	207,393	156,313
Cash and cash equivalents, end of period	$ 396,595	$ 140,906

Basis of Presentation

9 Months Ended

Sep. 30, 2013

Basis of Presentation

1. Basis of Presentation

The condensed consolidated financial statements of Packaging Corporation of America (“PCA” or the “Company”) as of September 30, 2013 and 2012 and for the three- and nine-month periods ended are unaudited but include all adjustments (consisting only of normal recurring adjustments) that management considers necessary for a fair presentation of such financial statements. These financial statements have been prepared in accordance with accounting principles generally accepted in the United States for interim financial information and with Article 10 of SEC Regulation S-X. Accordingly, they do not include all of the information and footnotes required by accounting principles generally accepted in the United States for complete audited financial statements. Operating results for the period ended September 30, 2013 are not necessarily indicative of the results that may be expected for the year ending December 31, 2013. These condensed consolidated financial statements should be read in conjunction with PCA’s Annual Report on Form 10-K for the year ended December 31, 2012.

Summary of Accounting Policies

9 Months Ended

Sep. 30, 2013

Summary of Accounting Policies

2. Summary of Accounting Policies

Basis of Consolidation

The accompanying condensed consolidated financial statements of PCA include all majority-owned subsidiaries. All intercompany transactions have been eliminated. The Company has two joint ventures that are accounted for under the equity method.

Use of Estimates

The preparation of financial statements in conformity with U.S. generally accepted accounting principles requires management to make estimates and assumptions that affect the amounts in the financial statements and the accompanying notes. Actual results could differ from those estimates.

Revenue Recognition

The Company recognizes revenue as title to the products is transferred to customers. The cost of shipping and handling products billed to a customer are included in net sales. Shipping and product handling costs not billed to a customer are included in cost of sales. In addition, the Company offers volume rebates to certain of its customers. The cost of these rebates is estimated and accrued as a reduction to net sales at the time of the respective sale.

Segment Information

PCA is engaged in one line of business: the integrated manufacture and sale of packaging materials, boxes and containers for industrial and consumer markets. No single customer accounts for more than 10% of total net sales.

Recent Accounting Pronouncements

In July 2013, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”) 2013-11, “Income Taxes (Topic 740) — Presentation of an Unrecognized Tax Benefit When a Net Operating Loss Carryforward, a Similar Tax Loss, or a Tax Credit Carryforward Exists.” This ASU requires that liabilities related to unrecognized tax benefits offset deferred tax assets for net operating loss carryforwards, a similar tax loss or a tax credit carryforward if such settlement is required or expected in the event the uncertain tax position is disallowed. In situations in which carryforwards cannot be used or the deferred tax asset is not intended to be used for such purpose, the unrecognized tax benefit should be recorded as a liability and should not offset deferred tax assets. The amendments in this ASU are effective for fiscal years, and interim periods within those years, beginning after December 15, 2013. The Company is currently evaluating the potential impact of the adoption of this ASU on its financial position and results of operations.

Also in July 2013, the FASB issued ASU 2013-10, “Derivatives and Hedging (Topic 815) — Inclusion of the Fed Funds Effective Swap Rate (or Overnight Index Swap Rate) as a Benchmark Interest Rate for Hedge Accounting Purposes.” The amendments in this ASU permit the Fed Funds Effective Swap rate to be used as a benchmark interest rate for hedge accounting purposes under Topic 815, in addition to interest rates on Treasury obligations of the U.S. government and the London Interbank Offered Rate (or LIBOR). The amendments also remove the restriction on using different benchmark rates for similar hedges. This ASU is effective prospectively for qualifying new or redesignated hedging relationships entered into on or after July 17, 2013. The guidance in this ASU will impact the Company’s accounting for hedging relationships to the extent the Company has any such relationships.

In February 2013, the FASB issued ASU 2013-02, “Comprehensive Income (Topic 220) — Reporting of Amounts Reclassified Out of Accumulated Other Comprehensive Income.” The amendments in this ASU require an entity to provide information about the amounts reclassified out of accumulated other comprehensive income (“AOCI”) by component. In addition, an entity is required to present, either on the face of the statement where net income is presented or in the notes, significant amounts reclassified out of AOCI by the respective line items of net income but only if the amount reclassified is required under U.S. generally accepted accounting principles (“GAAP”) to be reclassified to net income in its entirety in the same reporting period. For other amounts not required under U.S. GAAP to be reclassified in their entirety to net income, an entity is required to cross-reference to other disclosures that provide additional detail about those amounts. The amendments in this ASU are effective prospectively for reporting periods beginning after December 15, 2012. Early adoption is permitted. The Company has complied with the provisions of ASU 2013-02 upon its adoption on January 1, 2013. See Note 4 for additional information.

Also in February 2013, the FASB issued ASU 2013-04, “Liabilities (Topic 405) — Obligations Resulting from Joint and Several Liability Arrangements for Which the Total Amount of the Obligation is Fixed at the Reporting Date.” This ASU requires an entity to measure obligations resulting from joint and several liability arrangements for which the total amount of the obligation within the scope of this guidance is fixed at the reporting date, as the sum of (a) the amount the reporting entity agreed to pay on the basis of its arrangement among its co-obligors and (b) any additional amount the reporting entity expects to pay on behalf of its co-obligors. This ASU also requires an entity to disclose the nature and amount of the obligation as well as other information about those obligations. The amendments in this ASU are effective for fiscal years, and interim periods within those years, beginning after December 15, 2013 and should be applied retrospectively to all prior periods presented. To the extent the Company has any joint and several liability arrangements, this ASU will impact the Company’s accounting for such arrangements.

In July 2012, the FASB issued ASU 2012-02, “Intangibles — Goodwill and Other (Topic 350) — Testing Indefinite-Lived Intangible Assets for Impairment.” The amendments in this ASU allow an entity to first assess qualitative factors to determine whether it is necessary to perform a quantitative impairment test. An entity would not be required to calculate the fair value of an indefinite-lived intangible asset unless the entity determines, based on a qualitative assessment, that it is more likely than not that the indefinite-lived intangible asset is impaired. The amendments in this ASU are effective for annual and interim impairment tests performed for fiscal years beginning after September 15, 2012. Early adoption is permitted. The adoption of this guidance on January 1, 2013 did not impact the Company’s financial position, results of operations or cash flows.

Earnings Per Share

9 Months Ended

Sep. 30, 2013

Earnings Per Share

3. Earnings Per Share

The following table sets forth the computation of basic and diluted income per common share for the periods presented.


	Three Months Ended September 30,
	2013		2012
(In thousands, except per share data)
Numerator:
Net income	$	84,180	$	39,791
Denominator:
Basic common shares outstanding		96,758		96,360
Effect of dilutive securities:
Stock options, unvested restricted stock and performance units		839		989

Diluted common shares outstanding		97,597		97,349

Basic income per common share	$	0.87	$	0.41
Diluted income per common share	$	0.86	$	0.41

	Nine Months Ended September 30,
	2013		2012
(In thousands, except per share data)
Numerator:
Net income	$	209,258	$	102,789
Denominator:
Basic common shares outstanding		96,536		96,408
Effect of dilutive securities:
Stock options, unvested restricted stock and performance units		976		1,112

Diluted common shares outstanding		97,512		97,520

Basic income per common share	$	2.17	$	1.07
Diluted income per common share	$	2.15	$	1.05

All outstanding options to purchase shares for the remaining periods presented were included in the computation of diluted common shares outstanding.

Accumulated Other Comprehensive Income

9 Months Ended

Sep. 30, 2013

Accumulated Other Comprehensive Income

4. Accumulated Other Comprehensive Income

Changes in accumulated other comprehensive income (“AOCI”) by component follows:


(In thousands)	Unrealized Loss on Treasury Locks, Net			Unrealized Loss on Foreign Exchange Contracts			Unfunded Employee Benefit Obligations			Total
Balance at December 31, 2012	$	(31,651	)	$	(392	)	$	(81,999	)	$	(114,042	)
Other comprehensive income before reclassifications		—			—			13,418			13,418
Amounts reclassified from AOCI		2,594			15			11,921			14,530

Net current period other comprehensive income		2,594			15			25,339			27,948

Balance at September 30, 2013	$	(29,057	)	$	(377	)	$	(56,660	)	$	(86,094	)

The above amounts are shown net of tax. Amounts in parentheses indicate debits.

The following table presents information about reclassification adjustments out of AOCI for the three- and nine-month periods ended September 30, 2013:


	Amounts Reclassified from AOCI
Details about AOCI Components (In thousands)	Three Months Ended September 30, 2013			Nine Months Ended September 30, 2013			Affected Line Item in the Statement Where Net Income is Presented
Unrealized loss on treasury locks, net	$	(1,414	)	$	(4,242	)	See (1) below
		549			1,648		Tax benefit

	$	(865	)	$	(2,594	)	Net of tax

Unrealized loss on foreign exchange contracts	$	(8	)	$	(25	)	See (2) below
		3			10		Tax benefit

	$	(5	)	$	(15	)	Net of tax

Unfunded employee benefit obligations
Amortization of prior service costs	$	(57	)	$	(2,965	)	See (3) below
Curtailment loss		(3,132	)		(10,908	)	See (3) below
Amortization of actuarial gains / (losses)		(2,351	)		(5,622	)	See (3) below

		(5,540	)		(19,495	)	Total before tax
		2,153			7,574		Tax benefit

	$	(3,387	)	$	(11,921	)	Net of tax

(1)	This amount reclassified from AOCI is included in interest expense, net. See Note 10 for additional information.

(2)	This amount reclassified from AOCI is included as depreciation in cost of sales.

(3)	These amounts reclassified from AOCI are included in the computation of net pension and postretirement costs. See Note 8 for additional information.

Amounts in parentheses shown above indicate expenses in the statement of income.

- Definition

The entire disclosure for comprehensive income, which includes, but is not limited to, 1) the amount of income tax expense or benefit allocated to each component of other comprehensive income, including reclassification adjustments, 2) the reclassification adjustments for each classification of other comprehensive income and 3) the ending accumulated balances for each component of comprehensive income.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 15
-URI http://asc.fasb.org/extlink&oid=28358780&loc=d3e689-108580

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 1A
-URI http://asc.fasb.org/extlink&oid=28358780&loc=SL7669619-108580

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 12
-URI http://asc.fasb.org/extlink&oid=28358780&loc=d3e640-108580

Reference 4: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
-Topic 220
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Reference 5: http://www.xbrl.org/2003/role/presentationRef
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-Paragraph 16
-URI http://asc.fasb.org/extlink&oid=28358780&loc=d3e709-108580

Reference 6: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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-Section S99
-Paragraph 1
-Subparagraph (SX 210.3-04)
-URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770

Reference 7: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
-Topic 220
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-Section 45
-Paragraph 11
-URI http://asc.fasb.org/extlink&oid=28358780&loc=d3e637-108580

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-Name Accounting Standards Codification
-Topic 220
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-URI http://asc.fasb.org/extlink&oid=28358780&loc=d3e681-108580

Reference 9: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Reclassification Adjustments
-URI http://asc.fasb.org/extlink&oid=6522872

+ Details

Stock-Based Compensation

9 Months Ended

Sep. 30, 2013

Stock-Based Compensation

5. Stock-Based Compensation

In October 1999, the Company adopted a long-term equity incentive plan, which allows for grants of stock options, stock appreciation rights, restricted stock and performance awards to directors, officers and employees of PCA, as well as others who engage in services for PCA. The Company has not granted any option awards since 2007. The plan, which was scheduled to terminate on October 19, 2014, was amended effective with the approval by the Company’s stockholders on May 1, 2013. The amendment extended the plan’s term by ten years to May 1, 2023 and increased the number of shares that may be granted under the plan by 2,000,000 shares to a total issuance of up to 10,550,000 shares of common stock over the life of the plan (including prior awards). As of September 30, 2013, share-based awards for 8,313,735 shares have been granted, net of forfeitures. Forfeitures are added back to the pool of shares of common stock available to be granted at a future date.

A summary of the Company’s restricted stock activity follows:


	2013						2012
	Shares			Fair Market Value at Date of Grant			Shares			Fair Market Value at Date of Grant
(Dollars in thousands)
Restricted stock outstanding at January 1		1,771,664		$	41,522			1,817,745		$	40,655
Granted		234,537			11,211			394,928			10,846
Vested		(600,088	)		(11,686	)		(405,309	)		(9,185	)
Cancellations		(32,360	)		(795	)		(8,945	)		(188	)

Restricted stock outstanding at September 30		1,373,753		$	40,252			1,798,419		$	42,128

Restricted stock awards granted to officers and employees generally vest at the end of a four-year period, and restricted stock awards granted to directors vest immediately. The fair value of restricted stock is determined based on the closing price of the Company’s stock on the grant date.

The Company granted performance unit awards to certain key employees on June 24, 2013. The number of units that vest at the end of a four-year period are based on the Company’s performance compared to a peer group. The performance units are paid out entirely in shares of the Company’s common stock. The award is valued at the closing price of the Company’s stock on the grant date and is expensed over the requisite service period based on the most probable number of awards expected to vest. A summary of the Company’s performance unit activity follows:


	2013
(Dollars in thousands)	Units		Fair Market Value at Date of Grant
Performance units at January 1		—	$	—
Granted		70,600		3,377

Performance units at September 30		70,600	$	3,377

Compensation expense for share-based awards recognized in the condensed consolidated statements of income for the three- and nine-month periods ended September 30, 2013 and 2012 was as follows:


	Three Months Ended September 30,						Nine Months Ended September 30,
	2013			2012			2013			2012
(In thousands)
Impact on income before income taxes	$	(3,182	)	$	(2,746	)	$	(9,956	)	$	(8,477	)
Income tax benefit		1,237			1,068			3,868			3,296

Impact on net income	$	(1,945	)	$	(1,678	)	$	(6,088	)	$	(5,181	)

The Company generally recognizes compensation expense associated with share-based awards ratably over their vesting periods. As PCA’s Board of Directors has the ability to accelerate vesting of share-based awards upon an employee’s retirement, the Company accelerates the recognition of compensation expense for certain employees approaching normal retirement age. As of September 30, 2013, there was $22.9 million and $3.2 million of total unrecognized compensation costs related to restricted stock awards and performance unit awards, respectively. The Company expects to recognize the cost of these awards over a weighted-average period of 2.8 years for restricted stock and 3.8 years for performance units. There is no unrecognized compensation cost related to stock option awards granted under the Company’s equity incentive plan as all outstanding awards have vested.

Inventories

9 Months Ended

Sep. 30, 2013

Inventories

6. Inventories

The components of inventories are as follows:


	September 30, 2013			December 31, 2012
(In thousands)
Raw materials	$	134,709		$	125,909
Work in process		9,680			8,287
Finished goods		78,533			78,788
Supplies and materials		113,973			119,284

Inventories at FIFO or average cost		336,895			332,268
Excess of FIFO or average cost over LIFO cost		(70,003	)		(63,501	)

Inventories, net	$	266,892		$	268,767

An actual valuation of inventory under the LIFO method is made only at the end of each year based on the inventory levels and costs at that time. Accordingly, interim LIFO calculations must necessarily be based on management’s estimates of expected year-end inventory levels and costs. Because these are subject to many factors beyond management’s control, interim results are subject to the final year-end LIFO inventory valuation.

Other Intangible Assets

9 Months Ended

Sep. 30, 2013

Other Intangible Assets

7. Other Intangible Assets

The components of other intangible assets are as follows:


	Weighted Average Remaining Life	As of September 30, 2013				As of December 31, 2012
	Weighted Average Remaining Life	Gross Carrying Amount		Accumulated Amortization		Gross Carrying Amount		Accumulated Amortization
(In thousands)
Customer relationships	16.3 years	$	48,261	$	12,997	$	48,261	$	10,663
Other	2.3 years		990		512		990		305

Total other intangible assets		$	49,251	$	13,509	$	49,251	$	10,968

Employee Benefit Plans and Other Postretirement Plans

9 Months Ended

Sep. 30, 2013

Employee Benefit Plans and Other Postretirement Plans

8. Employee Benefit Plans and Other Postretirement Plans

For the three- and nine-month periods ended September 30, 2013 and 2012, net pension costs were comprised of the following:


	Three Months Ended September 30,						Nine Months Ended September 30,
	2013			2012			2013			2012
(In thousands)
Components of Net Pension Costs
Service cost for benefits earned during the year	$	5,825		$	5,606		$	18,322		$	16,818
Interest cost on accumulated benefit obligation		4,269			3,700			12,250			11,100
Expected return on assets		(3,796	)		(3,027	)		(11,297	)		(9,081	)
Net amortization of unrecognized amounts
Prior service cost		163			1,498			3,284			4,495
Curtailment loss		3,132			—			10,908			—
Actuarial loss		2,217			1,229			5,220			3,687

Net pension costs	$	11,810		$	9,006		$	38,687		$	27,019

In June 2013, the United Steelworkers (“USW”) ratified a master labor agreement with PCA under which certain USW-represented corrugated plant employees will have pension accruals frozen under PCA’s hourly pension plan. As of the date of the pension freeze, affected USW-represented employees will transition to a defined contribution 401k plan for future service. In accordance with ASC 715, “Compensation — Retirement Benefits,” the Company recorded a $7.8 million pre-tax pension curtailment charge related to the unrecognized prior service costs of employees impacted by the pension freeze during the second quarter of 2013. The Company also remeasured the hourly pension plan benefit obligation using current fair values of plan assets and current assumptions, resulting in a decrease in the benefit obligation of $13.8 million with a corresponding decrease in accumulated other comprehensive income (loss) of $8.4 million and deferred taxes of $5.4 million.

In September 2013, the USW ratified a master labor agreement with PCA under which certain USW-represented containerboard mill employees will have pension accruals frozen under PCA’s hourly pension plan. As of the date of the pension freeze, affected USW-represented employees will transition to a defined contribution 401k plan for future service. The Company recorded a $3.1 million pre-tax pension curtailment charge related to the unrecognized prior service costs of employees impacted by the pension freeze during the third quarter of 2013. The Company also remeasured the hourly pension plan benefit obligation using current fair values of plan assets and current assumptions, resulting in a decrease in the benefit obligation of $8.1 million with a corresponding decrease in accumulated other comprehensive income (loss) of $5.0 million and deferred taxes of $3.1 million.

The Company makes pension plan contributions that are sufficient to fund its actuarially determined costs, generally equal to the minimum amounts required by the Employee Retirement Income Security Act (ERISA). However, from time to time the Company may make discretionary contributions in excess of the required minimum amounts. The Company contributed $30.0 million to the pension plans in September 2013.

For the three- and nine-month periods ended September 30, 2013 and 2012, net postretirement costs relating to certain medical benefits for retirees were comprised of the following:


	Three Months Ended September 30,						Nine Months Ended September 30,
	2013			2012			2013			2012
(In thousands)
Components of Net Postretirement Costs
Service cost for benefits earned during the year	$	515		$	464		$	1,545		$	1,392
Interest cost on accumulated benefit obligation		311			310			934			931
Net amortization of unrecognized amounts
Prior service cost		(106	)		(104	)		(319	)		(314	)
Actuarial loss		134			113			401			339

Net postretirement costs	$	854		$	783		$	2,561		$	2,348

Transfers of Financial Assets

9 Months Ended

Sep. 30, 2013

Transfers of Financial Assets

9. Transfers of Financial Assets

PCA has an on-balance sheet securitization program for its trade accounts receivable that is accounted for as a secured borrowing under ASC 860, “Transfers and Servicing.” To effectuate this program, the Company formed a wholly owned, limited-purpose subsidiary, Packaging Credit Company, LLC (“PCC”), which in turn formed a wholly owned, bankruptcy-remote, special-purpose subsidiary, Packaging Receivables Company, LLC (“PRC”), for the purpose of acquiring receivables from PCC. Both of these entities are included in the consolidated financial statements of the Company. Under this program, PCC purchases on an ongoing basis substantially all of the receivables of the Company and sells such receivables to PRC. PRC and lenders established a $200.0 million receivables-backed revolving credit facility (“Receivables Credit Facility”) through which PRC obtains funds to purchase receivables from PCC. The receivables purchased by PRC are solely the property of PRC. In the event of liquidation of PRC, the creditors of PRC would be entitled to satisfy their claims from PRC’s assets prior to any distribution to PCC or the Company. Credit available under the receivables credit facility is on a borrowing-base formula. As a result, the full amount of the facility may not be available at all times. At September 30, 2013, $109.0 million was outstanding and included in “Long-term debt” on the condensed consolidated balance sheet. Substantially all accounts receivable at September 30, 2013 have been sold to PRC and are included in “Accounts receivable, net of allowance for doubtful accounts and customer deductions” on the condensed consolidated balance sheet.

- Definition

The entire disclosure for a transferor's continuing involvement in financial assets that it has transferred in a securitization or asset-backed financing arrangement, the nature of any restrictions on assets reported by an entity in its statement of financial position that relate to a transferred financial asset (including the carrying amounts of such assets), how servicing assets and servicing liabilities are reported, and (for securitization or asset-backed financing arrangements accounted for as sales) when a transferor has continuing involvement with the transferred financial assets and transfers of financial assets accounted for as secured borrowings, how the transfer of financial assets affects an entity's financial position, financial performance, and cash flows.

+ References + Details

Derivative Instruments and Hedging Activities

9 Months Ended

Sep. 30, 2013

Derivative Instruments and Hedging Activities

10. Derivative Instruments and Hedging Activities

The Company records its derivatives in accordance with ASC 815, “Derivatives and Hedging.” The guidance requires the Company to recognize derivative instruments as either assets or liabilities in the balance sheet at fair value. The accounting for changes in the fair value of a derivative depends on the intended use and designation of the derivative instrument. For a derivative designated as a fair value hedge, the gain or loss on the derivative is recognized in earnings in the period of change in fair value together with the offsetting gain or loss on the hedged item. For a derivative instrument designated as a cash flow hedge, the effective portion of the derivative’s gain or loss is initially reported as a component of accumulated other comprehensive income (loss) (“AOCI”) and is subsequently recognized in earnings when the hedged exposure affects earnings. The ineffective portion of the gain or loss is recognized in earnings. At September 30, 2013, PCA did not have any derivative instruments outstanding.

Hedging Strategy

PCA is exposed to certain risks relating to its ongoing operations. When appropriate, the Company uses derivatives as a risk management tool to mitigate the potential impact of certain market risks. The primary risks managed by using derivative financial instruments are interest rate and foreign currency exchange rate risks. PCA does not enter into derivative financial instruments for trading or speculative purposes.

Interest Rate Risk

The Company has historically used treasury lock derivative instruments to manage interest costs and the risk associated with changing interest rates. In connection with contemplated issuances of ten-year debt securities, PCA entered into interest rate protection agreements with counterparties in 2008, 2010 and 2011 to protect against increases in the ten-year U.S. Treasury Note rate. These treasury rates served as references in determining the interest rates applicable to the debt securities the Company issued in March 2008 and June 2012. As a result of changes in the interest rates on those treasury securities between the time PCA entered into the agreements and the time PCA priced and issued the debt securities, the Company: (1) made a payment of $4.4 million to the counterparty upon settlement of the 2008 interest rate protection agreement on March 25, 2008; (2) received a payment of $9.9 million from the counterparties upon settlement of the 2010 interest rate protection agreements on February 4, 2011; and (3) made a payment of $65.5 million to the counterparty upon settlement of the 2011 interest rate protection agreement on June 26, 2012. The Company recorded the effective portion of the settlements in AOCI, and these amounts are being amortized over the terms of the respective notes. The net amount of settlement gains or losses on derivative instruments included in AOCI to be amortized over the next 12 months is a net loss of $5.7 million ($3.7 million after tax).

- Definition

The entire disclosure for derivative instruments and hedging activities including, but not limited to, risk management strategies, non-hedging derivative instruments, assets, liabilities, revenue and expenses, and methodologies and assumptions used in determining the amounts.

+ References

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+ Details

Fair Value Measurements

9 Months Ended

Sep. 30, 2013

Fair Value Measurements

11. Fair Value Measurements

The following presents information about PCA’s assets and liabilities measured at fair value and the valuation techniques used to determine those fair values. The inputs used in the determination of fair values are categorized according to the fair value hierarchy as being Level 1, Level 2 or Level 3 in accordance with ASC 820, “Fair Value Measurements and Disclosures.” The valuation techniques are as follows:

(a) Market approach — prices and other relevant information generated by market transactions involving identical or comparable assets or liabilities

(b) Cost approach — amount that would be required to replace the service capacity of an asset (replacement cost)

(c) Income approach — techniques to convert future amounts to a single present amount based on market expectations (including present value techniques, option-pricing and excess earnings models)

A summary of financial instruments recognized at fair value on a recurring basis follows:


(In thousands)	Total		Quoted prices in active markets for identical assets (Level 1)		Other observable inputs (Level 2)		Unobservable inputs (Level 3)
September 30, 2013
Cash and Cash Equivalents
Cash	$	2,895	$	2,895	$	—	$	—
Money market funds		393,700		393,700		—		—
December 31, 2012
Cash and Cash Equivalents
Cash	$	3,893	$	3,893	$	—	$	—
Money market funds		203,500		203,500		—		—

PCA values its financial instruments using the market approach. No financial instruments were recognized using unobservable inputs.

There were no changes in the Company’s valuation techniques used to measure fair values on a recurring basis since December 31, 2012. PCA had no assets or liabilities that were measured on a nonrecurring basis.

Other Fair Value Measurements

Long-term debt and the current maturities of long-term debt had a carrying value of $782.4 million and a fair value of $787.4 million at September 30, 2013 compared to $793.6 million and $825.0 million, respectively, at December 31, 2012. The fair value of the Company’s senior notes is determined based on quoted market prices. The carrying value of the Company’s variable rate debt approximates its market value due to the variable interest-rate feature of the instrument. These are considered Level 2 fair value measurements.

Environmental Liabilities

9 Months Ended

Sep. 30, 2013

Environmental Liabilities

12. Environmental Liabilities

The potential costs for various environmental matters are uncertain due to such factors as the unknown magnitude of possible cleanup costs, the complexity and evolving nature of governmental laws and regulations and their interpretations, and the timing, varying costs and effectiveness of alternative cleanup technologies. From 1994 through September 30, 2013, remediation costs at PCA’s mills and corrugated plants totaled approximately $3.2 million. As of September 30, 2013, the Company maintained an environmental reserve of $12.2 million relating to on-site landfills and surface impoundments as well as ongoing and anticipated remedial projects. Liabilities recorded for environmental contingencies are estimates of the probable costs based upon available information and assumptions. Because of these uncertainties, PCA’s estimates may change. As of the date of this filing, the Company believes that it is not reasonably possible that future environmental expenditures for remediation costs and asset retirement obligations above the $12.2 million accrued as of September 30, 2013 will have a material impact on its financial condition, results of operations, or cash flows.

Stock Repurchase Program

9 Months Ended

Sep. 30, 2013

Stock Repurchase Program

13. Stock Repurchase Program

On December 14, 2011, the Company announced that its Board of Directors had authorized the repurchase of $150.0 million of the Company’s outstanding common stock. During the first nine months of 2013, the Company repurchased 171,263 shares of common stock for $7.8 million, or $45.54 per share, under this authorization. All of the shares purchased during the nine months of 2013 were retired prior to September 30, 2013. As of September 30, 2013, $98.1 million of the $150.0 million authorization remained available for repurchase of the Company’s common stock.

Alternative Energy Tax Credits

9 Months Ended

Sep. 30, 2013

Alternative Energy Tax Credits

14. Alternative Energy Tax Credits

The Company generates black liquor as a by-product of its pulp manufacturing process, which entitled it to certain federal income tax credits. When black liquor is mixed with diesel, it is considered an alternative fuel that was eligible for a $0.50 per gallon refundable alternative fuel mixture credit for gallons produced before December 31, 2009. Black liquor is also eligible for a $1.01 per gallon taxable cellulosic biofuel producer credit for gallons of black liquor produced and used in 2009. In an Internal Revenue Service (“IRS”) memorandum released in 2010, the IRS concluded that a black liquor producer may claim the alternative fuel mixture credit and the cellulosic biofuel producer credit in the same taxable year for different volumes of black liquor (the same gallon of fuel cannot receive both credits but can be claimed as either an alternative fuel mixture credit or a cellulosic biofuel producer credit).

During 2010, the IRS released guidance related to the alternative energy credits which resulted in: (1) reallocation of gallons of black liquor from the alternative fuel mixture credit to the cellulosic biofuel credit; and (2) the determination that the Company’s proprietary biofuel process at its Filer City, Michigan mill would likely qualify for the cellulosic biofuel producer credit. The Company amended its 2009 federal income tax return in December 2010 to claim the additional Filer City gallons, resulting in $107.0 million of cellulosic biofuel producer credits. In addition, the Company recorded in 2010 a reserve for unrecognized tax benefits under ASC 740, “Income Taxes,” of $102.0 million (net of the federal benefit for state taxes) because the IRS guidelines do not specifically address the unique and proprietary nature of the Filer City mill process and uncertainty exists.

On February 3, 2012, PCA again amended its 2009 federal tax return to reallocate claimed gallons from cellulosic biofuel producer credits to alternative fuel mixture credits. As a result of this change, the Company recorded a charge of $118.5 million in “Provision for income taxes” and income of $95.5 million in “Alternative fuel mixture credits,” together resulting in a first quarter 2012 net non-cash, after–tax charge of $23.0 million.

The cellulosic biofuel producer credit is a taxable credit. However, the laws governing the taxability of the alternative fuel mixture credit are not completely defined. The IRS has not issued definitive guidance regarding such taxability. PCA believes that the manner in which the credit was claimed will not subject the Company to federal or state income taxes on such benefits. If it is determined that any of the alternative fuel mixture credits are subject to taxation, PCA will be required to pay those taxes and take a corresponding charge to its net income. During March of 2011, the IRS began its review of PCA’s 2008 and 2009 federal income tax returns including the alternative energy tax credits claimed. Due to the anticipated conclusion of this audit, PCA expects the reserve for unrecognized tax benefits for the Filer City mill alternative energy tax credits to change significantly by the end of 2013. PCA estimates the change in the reserve for unrecognized tax benefits to be between $0 and $105.0 million.

As of September 30, 2013, PCA had no alternative energy tax credits available to offset future tax payments.

Legal Proceedings

9 Months Ended

Sep. 30, 2013

Legal Proceedings

15. Legal Proceedings

During September and October 2010, PCA and eight other U.S. and Canadian containerboard producers were named as defendants in five purported class action lawsuits filed in the United States District Court for the Northern District of Illinois, alleging violations of the Sherman Act. The lawsuits have been consolidated in a single complaint under the caption Kleen Products LLC v Packaging Corp. of America et al. The consolidated complaint alleges that the defendants conspired to limit the supply of containerboard, and that the purpose and effect of the alleged conspiracy was to artificially increase prices of containerboard products during the period of August 2005 to the time of filing of the complaint. The complaint was filed as a purported class action suit on behalf of all purchasers of containerboard products during such period. The complaint seeks treble damages and costs, including attorney’s fees. The defendants’ motions to dismiss the complaint were denied by the court in April 2011. PCA believes the allegations are without merit and is defending this lawsuit vigorously. However, as discovery has not been completed, PCA is unable to predict the ultimate outcome or estimate a range of reasonably possible losses.

PCA is a party to various other legal actions arising in the ordinary course of our business. These legal actions cover a broad variety of claims spanning our entire business. As of the date of this filing, we believe it is not reasonably possible that the resolution of these legal actions will, individually or in the aggregate, have a material adverse effect on our financial condition, results of operations or cash flows.

Acquisition

9 Months Ended

Sep. 30, 2013

Acquisition

16. Acquisition

On March 16, 2012, PCA acquired Packaging Specialists, a corrugated products manufacturer located near Pittsburgh, Pennsylvania, for $35.4 million. Sales and total assets of the acquisition were not material to PCA’s overall sales and total assets prior to the acquisition. Operating results of the acquisition subsequent to March 16, 2012 are included in the Company’s operating results. The Company has allocated the purchase price to the assets acquired and liabilities assumed, of which $9.6 million has been allocated to goodwill (which is deductible for tax purposes), $15.5 million to customer relationships (to be amortized over a life of 15 years) and $0.6 million to other intangible assets (to be amortized over a life of four years).

- Definition

The entire disclosure for a business combination (or series of individually immaterial business combinations) completed during the period, including background, timing, and recognized assets and liabilities. The disclosure may include leverage buyout transactions (as applicable).

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+ Details

Subsequent Events

9 Months Ended

Sep. 30, 2013

Subsequent Events

17. Subsequent Events

The Company has disclosed the following subsequent event in accordance with ASC 855, “Subsequent Events.” Subsequent events have been evaluated through the filing date of this Form 10-Q.

On October 25, 2013 we completed the acquisition of Boise Inc. (“Boise”), a large manufacturer of packaging and paper products with $2.6 billion in net sales for the year ended December 31, 2012, for $12.55 per share. In connection with the acquisition, PCA refinanced approximately $775.0 million of Boise’s indebtedness. The total transaction value, net of cash acquired, was approximately $1.94 billion, including the $775.0 million of Boise indebtedness. PCA incurred approximately $4.2 million in expenses relating to the transaction during the third quarter and will incur significant expenses relating to the transaction during the fourth quarter, including $55.7 million in redemption premiums paid to redeem Boise notes which will be recorded as interest expense. PCA used the proceeds of approximately $2.0 billion of new borrowings, including $1.3 billion in new term loan facilities and $700.0 million in new 4.50% ten year notes, together with cash on hand to finance the acquisition and related expenses and refinance Boise and certain PCA indebtedness.

The transaction is expected to increase PCA’s containerboard capacity to approximately 3.7 million tons from its current level of 2.6 million tons, including the announced expansion of the DeRidder, Louisiana mill. PCA’s corrugated products volume will increase by approximately 30%. As a result of the acquisition, PCA’s corrugated products presence will expand in the Pacific Northwest. In addition to the Boise packaging business, PCA also acquired the Boise paper business, a major producer of uncoated freesheet and specialty papers. The results of operations of Boise will be included in PCA’s results for periods on and after October 25, 2013.

Due to the limited time between the acquisition date and the date of this filing, the initial accounting for the Boise acquisition is incomplete at this time. As a result, as of the acquisition date, the Company is unable to provide pro forma financial statements, including the amounts recognized for the major classes of assets acquired and liabilities assumed. This information will be included in the Company’s 2013 Annual Report on Form 10-K.

Summary of Accounting Policies (Policies)	9 Months Ended
Summary of Accounting Policies (Policies)	Sep. 30, 2013
Basis of Consolidation	*Basis of Consolidation* The accompanying condensed consolidated financial statements of PCA include all majority-owned subsidiaries. All intercompany transactions have been eliminated. The Company has two joint ventures that are accounted for under the equity method.
Use of Estimates	*Use of Estimates* The preparation of financial statements in conformity with U.S. generally accepted accounting principles requires management to make estimates and assumptions that affect the amounts in the financial statements and the accompanying notes. Actual results could differ from those estimates.
Revenue Recognition	*Revenue Recognition* The Company recognizes revenue as title to the products is transferred to customers. The cost of shipping and handling products billed to a customer are included in net sales. Shipping and product handling costs not billed to a customer are included in cost of sales. In addition, the Company offers volume rebates to certain of its customers. The cost of these rebates is estimated and accrued as a reduction to net sales at the time of the respective sale.
Segment Information	*Segment Information* PCA is engaged in one line of business: the integrated manufacture and sale of packaging materials, boxes and containers for industrial and consumer markets. No single customer accounts for more than 10% of total net sales.
Recent Accounting Pronouncements	*Recent Accounting Pronouncements* In July 2013, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”) 2013-11, “Income Taxes (Topic 740) — Presentation of an Unrecognized Tax Benefit When a Net Operating Loss Carryforward, a Similar Tax Loss, or a Tax Credit Carryforward Exists.” This ASU requires that liabilities related to unrecognized tax benefits offset deferred tax assets for net operating loss carryforwards, a similar tax loss or a tax credit carryforward if such settlement is required or expected in the event the uncertain tax position is disallowed. In situations in which carryforwards cannot be used or the deferred tax asset is not intended to be used for such purpose, the unrecognized tax benefit should be recorded as a liability and should not offset deferred tax assets. The amendments in this ASU are effective for fiscal years, and interim periods within those years, beginning after December 15, 2013. The Company is currently evaluating the potential impact of the adoption of this ASU on its financial position and results of operations. Also in July 2013, the FASB issued ASU 2013-10, “Derivatives and Hedging (Topic 815) — Inclusion of the Fed Funds Effective Swap Rate (or Overnight Index Swap Rate) as a Benchmark Interest Rate for Hedge Accounting Purposes.” The amendments in this ASU permit the Fed Funds Effective Swap rate to be used as a benchmark interest rate for hedge accounting purposes under Topic 815, in addition to interest rates on Treasury obligations of the U.S. government and the London Interbank Offered Rate (or LIBOR). The amendments also remove the restriction on using different benchmark rates for similar hedges. This ASU is effective prospectively for qualifying new or redesignated hedging relationships entered into on or after July 17, 2013. The guidance in this ASU will impact the Company’s accounting for hedging relationships to the extent the Company has any such relationships. In February 2013, the FASB issued ASU 2013-02, “Comprehensive Income (Topic 220) — Reporting of Amounts Reclassified Out of Accumulated Other Comprehensive Income.” The amendments in this ASU require an entity to provide information about the amounts reclassified out of accumulated other comprehensive income (“AOCI”) by component. In addition, an entity is required to present, either on the face of the statement where net income is presented or in the notes, significant amounts reclassified out of AOCI by the respective line items of net income but only if the amount reclassified is required under U.S. generally accepted accounting principles (“GAAP”) to be reclassified to net income in its entirety in the same reporting period. For other amounts not required under U.S. GAAP to be reclassified in their entirety to net income, an entity is required to cross-reference to other disclosures that provide additional detail about those amounts. The amendments in this ASU are effective prospectively for reporting periods beginning after December 15, 2012. Early adoption is permitted. The Company has complied with the provisions of ASU 2013-02 upon its adoption on January 1, 2013. See Note 4 for additional information. Also in February 2013, the FASB issued ASU 2013-04, “Liabilities (Topic 405) — Obligations Resulting from Joint and Several Liability Arrangements for Which the Total Amount of the Obligation is Fixed at the Reporting Date.” This ASU requires an entity to measure obligations resulting from joint and several liability arrangements for which the total amount of the obligation within the scope of this guidance is fixed at the reporting date, as the sum of (a) the amount the reporting entity agreed to pay on the basis of its arrangement among its co-obligors and (b) any additional amount the reporting entity expects to pay on behalf of its co-obligors. This ASU also requires an entity to disclose the nature and amount of the obligation as well as other information about those obligations. The amendments in this ASU are effective for fiscal years, and interim periods within those years, beginning after December 15, 2013 and should be applied retrospectively to all prior periods presented. To the extent the Company has any joint and several liability arrangements, this ASU will impact the Company’s accounting for such arrangements. In July 2012, the FASB issued ASU 2012-02, “Intangibles — Goodwill and Other (Topic 350) — Testing Indefinite-Lived Intangible Assets for Impairment.” The amendments in this ASU allow an entity to first assess qualitative factors to determine whether it is necessary to perform a quantitative impairment test. An entity would not be required to calculate the fair value of an indefinite-lived intangible asset unless the entity determines, based on a qualitative assessment, that it is more likely than not that the indefinite-lived intangible asset is impaired. The amendments in this ASU are effective for annual and interim impairment tests performed for fiscal years beginning after September 15, 2012. Early adoption is permitted. The adoption of this guidance on January 1, 2013 did not impact the Company’s financial position, results of operations or cash flows.

- Definition

Disclosure of accounting policy regarding (1) the principles it follows in consolidating or combining the separate financial statements, including the principles followed in determining the inclusion or exclusion of subsidiaries or other entities in the consolidated or combined financial statements and (2) its treatment of interests (for example, common stock, a partnership interest or other means of exerting influence) in other entities, for example consolidation or use of the equity or cost methods of accounting. The accounting policy may also address the accounting treatment for intercompany accounts and transactions, noncontrolling interest, and the income statement treatment in consolidation for issuances of stock by a subsidiary.

+ References + Details

- Definition

Disclosure of accounting policy for revenue recognition. If the entity has different policies for different types of revenue transactions, the policy for each material type of transaction is generally disclosed. If a sales transaction has multiple element arrangements (for example, delivery of multiple products, services or the rights to use assets) the disclosure may indicate the accounting policy for each unit of accounting as well as how units of accounting are determined and valued. The disclosure may encompass important judgment as to appropriateness of principles related to recognition of revenue. The disclosure also may indicate the entity's treatment of any unearned or deferred revenue that arises from the transaction.

+ References + Details

Earnings Per Share (Tables)

9 Months Ended

Sep. 30, 2013

Computation of Basic and Diluted Income Per Common Share

The following table sets forth the computation of basic and diluted income per common share for the periods presented.


	Three Months Ended September 30,
	2013		2012
(In thousands, except per share data)
Numerator:
Net income	$	84,180	$	39,791
Denominator:
Basic common shares outstanding		96,758		96,360
Effect of dilutive securities:
Stock options, unvested restricted stock and performance units		839		989

Diluted common shares outstanding		97,597		97,349

Basic income per common share	$	0.87	$	0.41
Diluted income per common share	$	0.86	$	0.41

	Nine Months Ended September 30,
	2013		2012
(In thousands, except per share data)
Numerator:
Net income	$	209,258	$	102,789
Denominator:
Basic common shares outstanding		96,536		96,408
Effect of dilutive securities:
Stock options, unvested restricted stock and performance units		976		1,112

Diluted common shares outstanding		97,512		97,520

Basic income per common share	$	2.17	$	1.07
Diluted income per common share	$	2.15	$	1.05

Accumulated Other Comprehensive Income (Tables)

9 Months Ended

Sep. 30, 2013

Components of Changes in Accumulated Other Comprehensive Income ("AOCI")

Changes in accumulated other comprehensive income (“AOCI”) by component follows:


(In thousands)	Unrealized Loss on Treasury Locks, Net			Unrealized Loss on Foreign Exchange Contracts			Unfunded Employee Benefit Obligations			Total
Balance at December 31, 2012	$	(31,651	)	$	(392	)	$	(81,999	)	$	(114,042	)
Other comprehensive income before reclassifications		—			—			13,418			13,418
Amounts reclassified from AOCI		2,594			15			11,921			14,530

Net current period other comprehensive income		2,594			15			25,339			27,948

Balance at September 30, 2013	$	(29,057	)	$	(377	)	$	(56,660	)	$	(86,094	)

Reclassification Adjustments Out of AOCI

The following table presents information about reclassification adjustments out of AOCI for the three- and nine-month periods ended September 30, 2013:


	Amounts Reclassified from AOCI
Details about AOCI Components (In thousands)	Three Months Ended September 30, 2013			Nine Months Ended September 30, 2013			Affected Line Item in the Statement Where Net Income is Presented
Unrealized loss on treasury locks, net	$	(1,414	)	$	(4,242	)	See (1) below
		549			1,648		Tax benefit

	$	(865	)	$	(2,594	)	Net of tax

Unrealized loss on foreign exchange contracts	$	(8	)	$	(25	)	See (2) below
		3			10		Tax benefit

	$	(5	)	$	(15	)	Net of tax

Unfunded employee benefit obligations
Amortization of prior service costs	$	(57	)	$	(2,965	)	See (3) below
Curtailment loss		(3,132	)		(10,908	)	See (3) below
Amortization of actuarial gains / (losses)		(2,351	)		(5,622	)	See (3) below

		(5,540	)		(19,495	)	Total before tax
		2,153			7,574		Tax benefit

	$	(3,387	)	$	(11,921	)	Net of tax

(1)	This amount reclassified from AOCI is included in interest expense, net. See Note 10 for additional information.

(2)	This amount reclassified from AOCI is included as depreciation in cost of sales.

(3)	These amounts reclassified from AOCI are included in the computation of net pension and postretirement costs. See Note 8 for additional information.

Stock-Based Compensation (Tables)

9 Months Ended

Sep. 30, 2013

Summary of Restricted Stock Activity

A summary of the Company’s restricted stock activity follows:


	2013						2012
	Shares			Fair Market Value at Date of Grant			Shares			Fair Market Value at Date of Grant
(Dollars in thousands)
Restricted stock outstanding at January 1		1,771,664		$	41,522			1,817,745		$	40,655
Granted		234,537			11,211			394,928			10,846
Vested		(600,088	)		(11,686	)		(405,309	)		(9,185	)
Cancellations		(32,360	)		(795	)		(8,945	)		(188	)

Restricted stock outstanding at September 30		1,373,753		$	40,252			1,798,419		$	42,128

Summary of Performance Unit Activity

A summary of the Company’s performance unit activity follows:


	2013
(Dollars in thousands)	Units		Fair Market Value at Date of Grant
Performance units at January 1		—	$	—
Granted		70,600		3,377

Performance units at September 30		70,600	$	3,377

Compensation Expense for Restricted Stock Recognized in Condensed Consolidated Statements of Income

Compensation expense for share-based awards recognized in the condensed consolidated statements of income for the three- and nine-month periods ended September 30, 2013 and 2012 was as follows:


	Three Months Ended September 30,						Nine Months Ended September 30,
	2013			2012			2013			2012
(In thousands)
Impact on income before income taxes	$	(3,182	)	$	(2,746	)	$	(9,956	)	$	(8,477	)
Income tax benefit		1,237			1,068			3,868			3,296

Impact on net income	$	(1,945	)	$	(1,678	)	$	(6,088	)	$	(5,181	)

Inventories (Tables)

9 Months Ended

Sep. 30, 2013

Components of Inventories

The components of inventories are as follows:


	September 30, 2013			December 31, 2012
(In thousands)
Raw materials	$	134,709		$	125,909
Work in process		9,680			8,287
Finished goods		78,533			78,788
Supplies and materials		113,973			119,284

Inventories at FIFO or average cost		336,895			332,268
Excess of FIFO or average cost over LIFO cost		(70,003	)		(63,501	)

Inventories, net	$	266,892		$	268,767

Other Intangible Assets (Tables)

9 Months Ended

Sep. 30, 2013

Components of Other Intangible Assets

The components of other intangible assets are as follows:


	Weighted Average Remaining Life	As of September 30, 2013				As of December 31, 2012
	Weighted Average Remaining Life	Gross Carrying Amount		Accumulated Amortization		Gross Carrying Amount		Accumulated Amortization
(In thousands)
Customer relationships	16.3 years	$	48,261	$	12,997	$	48,261	$	10,663
Other	2.3 years		990		512		990		305

Total other intangible assets		$	49,251	$	13,509	$	49,251	$	10,968

Employee Benefit Plans and Other Postretirement Plans (Tables)

9 Months Ended

Sep. 30, 2013

Pension Plans

Components of Net Periodic Benefit Cost

For the three- and nine-month periods ended September 30, 2013 and 2012, net pension costs were comprised of the following:


	Three Months Ended September 30,						Nine Months Ended September 30,
	2013			2012			2013			2012
(In thousands)
Components of Net Pension Costs
Service cost for benefits earned during the year	$	5,825		$	5,606		$	18,322		$	16,818
Interest cost on accumulated benefit obligation		4,269			3,700			12,250			11,100
Expected return on assets		(3,796	)		(3,027	)		(11,297	)		(9,081	)
Net amortization of unrecognized amounts
Prior service cost		163			1,498			3,284			4,495
Curtailment loss		3,132			—			10,908			—
Actuarial loss		2,217			1,229			5,220			3,687

Net pension costs	$	11,810		$	9,006		$	38,687		$	27,019

Postretirement Plans

Components of Net Periodic Benefit Cost

For the three- and nine-month periods ended September 30, 2013 and 2012, net postretirement costs relating to certain medical benefits for retirees were comprised of the following:


	Three Months Ended September 30,						Nine Months Ended September 30,
	2013			2012			2013			2012
(In thousands)
Components of Net Postretirement Costs
Service cost for benefits earned during the year	$	515		$	464		$	1,545		$	1,392
Interest cost on accumulated benefit obligation		311			310			934			931
Net amortization of unrecognized amounts
Prior service cost		(106	)		(104	)		(319	)		(314	)
Actuarial loss		134			113			401			339

Net postretirement costs	$	854		$	783		$	2,561		$	2,348

Fair Value Measurements (Tables)

9 Months Ended

Sep. 30, 2013

Assets and Liabilities Measured at Fair Value on a Recurring Basis

A summary of financial instruments recognized at fair value on a recurring basis follows:


(In thousands)	Total		Quoted prices in active markets for identical assets (Level 1)		Other observable inputs (Level 2)		Unobservable inputs (Level 3)
September 30, 2013
Cash and Cash Equivalents
Cash	$	2,895	$	2,895	$	—	$	—
Money market funds		393,700		393,700		—		—
December 31, 2012
Cash and Cash Equivalents
Cash	$	3,893	$	3,893	$	—	$	—
Money market funds		203,500		203,500		—		—

Summary of Accounting Policies - Additional Information (Detail)	9 Months Ended
	Sep. 30, 2013 Entity
Significant Accounting Policies [Line Items]
Number of joint ventures under equity method	2
Percent of net sales threshold used to determine major customers	10.00%

Computation of Basic and Diluted Income Per Common Share (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Earnings Per Share [Line Items]
Net income	$ 84,180	$ 39,791	$ 209,258	$ 102,789
Basic common shares outstanding	96,758	96,360	96,536	96,408
Stock options, unvested restricted stock and performance units	839	989	976	1,112
Diluted common shares outstanding	97,597	97,349	97,512	97,520
Basic income per common share	$ 0.87	$ 0.41	$ 2.17	$ 1.07
Diluted income per common share	$ 0.86	$ 0.41	$ 2.15	$ 1.05

- Definition

The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

+ References + Details

- Definition

The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Net Income
-URI http://asc.fasb.org/extlink&oid=6518256

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 225
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-04.19)
-URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.18)
-URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 225
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-04.22)
-URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Other Comprehensive Income
-URI http://asc.fasb.org/extlink&oid=6519514

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 6
-URI http://asc.fasb.org/extlink&oid=28358780&loc=d3e565-108580

Reference 9: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 03
-Paragraph 19
-Article 5

Reference 10: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 04
-Paragraph 20
-Article 9

+ Details

Changes in Accumulated Other Comprehensive Income by Component (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance at December 31, 2012			$ (114,042)
Other comprehensive income before reclassifications			13,418
Amounts reclassified from AOCI			14,530
Net current period other comprehensive income	$ 9,220	$ 1,067	27,948	$ (4,190)
Balance at Sept 30, 2013	(86,094)		(86,094)
Accumulated Defined Benefit Plans Adjustment
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance at December 31, 2012			(81,999)
Other comprehensive income before reclassifications			13,418
Amounts reclassified from AOCI			11,921
Net current period other comprehensive income			25,339
Balance at Sept 30, 2013	(56,660)		(56,660)
Treasury Lock \| Accumulated Net Gain (Loss) From Designated Or Qualifying Cash Flow Hedges
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance at December 31, 2012			(31,651)
Amounts reclassified from AOCI			2,594
Net current period other comprehensive income			2,594
Balance at Sept 30, 2013	(29,057)		(29,057)
Foreign Exchange Contract \| Accumulated Net Gain (Loss) From Designated Or Qualifying Cash Flow Hedges
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance at December 31, 2012			(392)
Amounts reclassified from AOCI			15
Net current period other comprehensive income			15
Balance at Sept 30, 2013	$ (377)		$ (377)

- Definition

Accumulated change in equity from transactions and other events and circumstances from non-owner sources, net of tax effect, at period end. Excludes Net Income (Loss), and accumulated changes in equity from transactions resulting from investments by owners and distributions to owners. Includes foreign currency translation items, certain pension adjustments, unrealized gains and losses on certain investments in debt and equity securities, other than temporary impairment (OTTI) losses related to factors other than credit losses on available-for-sale and held-to-maturity debt securities that an entity does not intend to sell and it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis, as well as changes in the fair value of derivatives related to the effective portion of a designated cash flow hedge.

+ References + Details

Reclassification Adjustments Out of Accumulated Other Comprehensive Income (Detail) - USD ($)
$ in Thousands

3 Months Ended

9 Months Ended

Sep. 30, 2013

Sep. 30, 2012

Sep. 30, 2013

Sep. 30, 2012

Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]

Interest expense, net

$ (11,850)

$ (30,590)

$ (30,333)

$ (53,529)

Cost of sales

(619,626)

(560,921)

(1,800,509)

(1,641,619)

Income before taxes

130,110

61,482

322,143

291,511

Provision for income taxes

(45,930)

(21,691)

(112,885)

(188,722)

Net income

84,180

$ 39,791

209,258

$ 102,789

Reclassification out of Accumulated Other Comprehensive Income | Accumulated Net Gain (Loss) From Designated Or Qualifying Cash Flow Hedges | Treasury Lock

Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]

Interest expense, net

^[1]

(1,414)

(4,242)

Provision for income taxes

549

1,648

Net income

(865)

(2,594)

Reclassification out of Accumulated Other Comprehensive Income | Accumulated Net Gain (Loss) From Designated Or Qualifying Cash Flow Hedges | Foreign Exchange Contract

Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]

Cost of sales

^[2]

(8)

(25)

Provision for income taxes

Net income

(5)

(15)

Reclassification out of Accumulated Other Comprehensive Income | Accumulated Defined Benefit Plans Adjustment

Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]

Amortization of prior service costs

^[3]

(57)

(2,965)

Curtailment loss

^[3]

(3,132)

(10,908)

Amortization of actuarial gains / (losses)

^[3]

(2,351)

(5,622)

Income before taxes

(5,540)

(19,495)

Provision for income taxes

2,153

7,574

Net income

$ (3,387)

$ (11,921)

[1]	This amount reclassified from AOCI is included in interest expense, net. See Note 10 for additional information.
[2]	This amount reclassified from AOCI is included as depreciation in cost of sales.
[3]	These amounts reclassified from AOCI are included in the computation of net pension and postretirement costs. See Note 8 for additional information.

Stock Based Compensation - Additional Information (Detail) $ in Millions	9 Months Ended
	Sep. 30, 2013 USD ($) shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Long-term equity incentive plan, termination date	Oct. 19, 2014
Long-term equity incentive plan, amendment date	May 01, 2013
Long-term equity incentive plan, term	10 years
Number of shares authorized under plan	10,550,000
Share based awards	8,313,735
Number of additional shares authorized for grant	2,000,000
Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period of equity awards granted to employees, years	4 years
Unrecognized compensation cost related to nonvested awards granted under the equity incentive plan \| $	$ 22.9
Expected weighted-average period to recognize the cost of stock awards (in years)	2 years 9 months 18 days
Performance Shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period of equity awards granted to employees, years	4 years
Unrecognized compensation cost related to nonvested awards granted under the equity incentive plan \| $	$ 3.2
Expected weighted-average period to recognize the cost of stock awards (in years)	3 years 9 months 18 days
After Amendment
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Long-term equity incentive plan, termination date	May 01, 2023

Summary of Restricted Stock Activity (Detail) - Restricted Stock - USD ($) shares in Thousands, $ in Thousands	9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Beginning Balance	1,771,664	1,817,745
Restricted stock, Shares,Granted	234,537	394,928
Restricted stock, Shares, Vested	(600,088)	(405,309)
Restricted stock, Shares, Cancellations	(32,360)	(8,945)
Ending Balance	1,373,753	1,798,419
Beginning Balance	$ 41,522	$ 40,655
Restricted stock, Granted, Fair Market Value at Date of Grant	11,211	10,846
Restricted stock, Vested, Fair Market Value at Date of Grant	(11,686)	(9,185)
Restricted stock, Cancellations, Fair Market Value at Date of Grant	(795)	(188)
Ending Balance	$ 40,252	$ 42,128

Summary of Stock Activity (Detail) - Performance Shares shares in Thousands, $ in Thousands	9 Months Ended
	Sep. 30, 2013 USD ($) shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Performance units, Granted \| shares	70,600
Ending Balance \| shares	70,600
Granted \| $	$ 3,377
Ending Balance \| $	$ 3,377

Compensation Expense for Restricted Stock Recognized in Condensed Consolidated Statements of Income (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Impact on income before income taxes	$ (3,182)	$ (2,746)	$ (9,956)	$ (8,477)
Income tax benefit	1,237	1,068	3,868	3,296
Impact on net income	$ (1,945)	$ (1,678)	$ (6,088)	$ (5,181)

Components of Inventories (Detail) - USD ($) $ in Thousands	Sep. 30, 2013	Dec. 31, 2012
Inventory [Line Items]
Raw materials	$ 134,709	$ 125,909
Work in process	9,680	8,287
Finished goods	78,533	78,788
Supplies and materials	113,973	119,284
Inventories at FIFO or average cost	336,895	332,268
Excess of FIFO or average cost over LIFO cost	(70,003)	(63,501)
Inventories, net	$ 266,892	$ 268,767

Components of Other Intangible Assets (Detail) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012
Schedule Of Goodwill And Intangible Assets [Line Items]
Gross Carrying Amount	$ 49,251	$ 49,251
Accumulated Amortization	$ 13,509	10,968
Customer Relationships
Schedule Of Goodwill And Intangible Assets [Line Items]
Weighted Average Remaining Life	16 years 3 months 18 days
Gross Carrying Amount	$ 48,261	48,261
Accumulated Amortization	$ 12,997	10,663
Other Intangible Assets
Schedule Of Goodwill And Intangible Assets [Line Items]
Weighted Average Remaining Life	2 years 3 months 18 days
Gross Carrying Amount	$ 990	990
Accumulated Amortization	$ 512	$ 305

Components of Net Pension Costs (Detail) - Pension Plans - USD ($) $ in Thousands	3 Months Ended			9 Months Ended
	Sep. 30, 2013	Jun. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Defined Benefit Plan Disclosure [Line Items]
Service cost for benefits earned during the year	$ 5,825		$ 5,606	$ 18,322	$ 16,818
Interest cost on accumulated benefit obligation	4,269		3,700	12,250	11,100
Expected return on assets	(3,796)		(3,027)	(11,297)	(9,081)
Net amortization of unrecognized amounts, Prior service cost	163		1,498	3,284	4,495
Curtailment loss	3,132	$ 7,800		10,908
Net amortization of unrecognized amounts, Actuarial loss	2,217		1,229	5,220	3,687
Net Benefit Costs	$ 11,810		$ 9,006	$ 38,687	$ 27,019

Employee Benefit Plans and Other Postretirement Plans - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Jun. 30, 2013	Sep. 30, 2013
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Decrease in the benefit obligation	$ 8,100	$ 13,800
Decrease in accumulated other comprehensive income (loss)	4,963	8,400	$ 13,418
Deferred taxes	3,100	5,400
Pension Plans
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Pre-tax pension curtailment charge	$ 3,132	$ 7,800	10,908
Expected company contributions			$ 30,000

Components of Net Postretirement Costs (Detail) - Postretirement Plans - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Defined Benefit Plan Disclosure [Line Items]
Service cost for benefits earned during the year	$ 515	$ 464	$ 1,545	$ 1,392
Interest cost on accumulated benefit obligation	311	310	934	931
Net amortization of unrecognized amounts, Prior service cost	(106)	(104)	(319)	(314)
Net amortization of unrecognized amounts, Actuarial loss	134	113	401	339
Net Benefit Costs	$ 854	$ 783	$ 2,561	$ 2,348

Transfers of Financial Assets - Additional Information (Detail) - Receivables Credit Facility $ in Millions	Sep. 30, 2013 USD ($)
Assets and Associated Liabilities of Transfers Accounted for as Secured Borrowings [Line Items]
Credit facility outstanding	$ 109.0
Line of Credit
Assets and Associated Liabilities of Transfers Accounted for as Secured Borrowings [Line Items]
Credit facility borrowing capacity	$ 200.0

Derivative Instruments and Hedging Activities - Additional Information (Detail) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012
Derivative [Line Items]
U.S. Treasury Note, maturity term (in years)	10 years
Proceeds from or (payments to) settlement of interest rate protection agreement		$ 65,500
Net amount of settlement gains (losses) on derivative instruments included in accumulated OCI to be amortized over next 12 months, before tax	$ (5,700)
Net amount of settlement gains (losses) on derivative instruments included in accumulated OCI to be amortized over next 12 months, after tax	(3,700)
2008 Interest Rate Protection Agreement
Derivative [Line Items]
Proceeds from or (payments to) settlement of interest rate protection agreement	(4,400)
2010 Interest Rate Protection Agreement
Derivative [Line Items]
Proceeds from or (payments to) settlement of interest rate protection agreement	9,900
2011 Interest Rate Protection Agreement
Derivative [Line Items]
Proceeds from or (payments to) settlement of interest rate protection agreement	$ (65,500)

Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) - Cash and Cash Equivalents - USD ($) $ in Thousands	Sep. 30, 2013	Dec. 31, 2012
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Cash	$ 2,895	$ 3,893
Money market funds	393,700	203,500
Quoted prices in active markets for identical assets (Level 1)
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Cash	2,895	3,893
Money market funds	$ 393,700	$ 203,500

Fair Value Measurements - Additional Information (Detail) - USD ($) $ in Millions	Sep. 30, 2013	Dec. 31, 2012
Fair Value Measurements [Line Items]
Long-term debt, carrying value	$ 782.4	$ 793.6
Long-term debt, fair value	$ 787.4	$ 825.0

Environmental Liabilities - Additional Information (Detail) $ in Millions	6 Months Ended
	Sep. 30, 2013 USD ($)
Site Contingency [Line Items]
Remediation costs	$ 3.2
Environmental reserve	$ 12.2

Stock Repurchase Program - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Millions	9 Months Ended	12 Months Ended
	Sep. 30, 2013	Dec. 31, 2011
Stock Repurchase Program [Line Items]
Common stock repurchase authorized amount		$ 150.0
Common stock repurchased, shares	171,263
Common stock repurchased, value	$ 7.8
Common stock repurchase price per share	$ 45.54
Common stock repurchase authorization amount available	$ 98.1

Alternative Energy Tax Credits - Additional Information (Detail) - USD ($)	3 Months Ended				9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Mar. 31, 2012	Dec. 31, 2010	Sep. 30, 2013	Sep. 30, 2012	Dec. 31, 2009
Alternative Energy Tax Credits [Line Items]
Uncertain tax positions				$ 102,000,000
Provision for income taxes	$ 45,930,000	$ 21,691,000			$ 112,885,000	$ 188,722,000
Alternative energy tax credits						$ 95,500,000
Change in reserve for unrecognized tax benefit, minimum	0				0
Change in reserve for unrecognized tax benefit, maximum	105,000,000				105,000,000
Tax credits used to offset future cash tax payment	$ 0				$ 0
Alternative Fuel Mixture Credits
Alternative Energy Tax Credits [Line Items]
Refundable tax credit per gallon							$ 0.50
Alternative energy tax credits			$ 95,500,000
Cellulosic Biofuel Tax Credits
Alternative Energy Tax Credits [Line Items]
Refundable tax credit per gallon							$ 1.01
Provision for income taxes			118,500,000
Amended Two Thousand Nine Federal Return
Alternative Energy Tax Credits [Line Items]
Cellulosic biofuel producer credits				$ 107,000,000
Alternative Energy Tax Credits
Alternative Energy Tax Credits [Line Items]
Alternative energy tax credits			$ (23,000,000)

Legal Proceedings - Additional Information (Detail)	2 Months Ended
Legal Proceedings - Additional Information (Detail)	Oct. 31, 2010
Legal Proceedings [Line Items]
Number of lawsuits filed by the plaintiffs	5
Number of other U.S. and Canadian containerboard producers	PCA and eight other U.S. and Canadian containerboard producers were named as defendants

Acquisition - Additional Information (Detail) - USD ($) $ in Millions	1 Months Ended	9 Months Ended
	Mar. 31, 2012	Sep. 30, 2013	Mar. 16, 2012
Customer Relationships
Business Acquisition [Line Items]
Intangible asset, useful life, in years		16 years 3 months 18 days
Other Intangible Assets
Business Acquisition [Line Items]
Intangible asset, useful life, in years		2 years 3 months 18 days
Packaging Specialists
Business Acquisition [Line Items]
Business acquisition, cost of acquired entity	$ 35.4
Purchase price allocation to goodwill deductible for tax purposes			$ 9.6
Packaging Specialists \| Customer Relationships
Business Acquisition [Line Items]
Purchase price allocation to intangible assets			15.5
Intangible asset, useful life, in years	15 years
Packaging Specialists \| Other Intangible Assets
Business Acquisition [Line Items]
Purchase price allocation to intangible assets			$ 0.6
Intangible asset, useful life, in years	4 years

Subsequent Events - Additional Information (Detail) $ / shares in Units, T in Millions	1 Months Ended	9 Months Ended		12 Months Ended
	Oct. 25, 2013 USD ($) T $ / shares	Sep. 30, 2013 USD ($) T	Sep. 30, 2012 USD ($)	Dec. 31, 2012 USD ($)
Subsequent Event [Line Items]
Senior notes, redemption premium			$ (21,296,000)
Estimated production capacity \| T		2.6
Boise Incorporation
Subsequent Event [Line Items]
Net sales reported by acquired entity for last fiscal year				$ 2,600,000,000
Business acquisition, transaction cost		$ 4,200,000
Subsequent Event
Subsequent Event [Line Items]
Estimated production capacity \| T	3.7
Corrugated products volume percentage increase	30.00%
Subsequent Event \| Boise Incorporation
Subsequent Event [Line Items]
Business acquisition common shares outstanding, per share \| $ / shares	$ 12.55
Business acquisition, outstanding indebtedness	$ 775,000,000
Business combination, transaction value	1,940,000,000
Senior notes, redemption premium	55,700,000
New borrowings	2,000,000,000
Subsequent Event \| Boise Incorporation \| Term LoanA Facility
Subsequent Event [Line Items]
New borrowings	1,300,000,000
Subsequent Event \| Boise Incorporation \| 4.50% notes
Subsequent Event [Line Items]
New borrowings	$ 700.0
Note interest rate	4.50%
Note maturity period	10 years