Packaging Corporation of America (PKG) 10-Q 8 Nov 13 2013 Q3 Quarterly report Financial data

Document_and_Entity_Informatio

Document and Entity Information	9 Months Ended
	Sep. 30, 2013	Nov. 06, 2013
Document Information [Line Items]	'	'
Document Type	'10-Q	'
Amendment Flag	'false	'
Document Period End Date	30-Sep-13	'
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

Condensed Consolidated Balance Sheets (USD $)	Sep. 30, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
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_Balance1

Condensed Consolidated Balance Sheets (Parenthetical) (USD $)	Sep. 30, 2013	Dec. 31, 2012
In Thousands, except Share data, unless otherwise specified
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_Stateme

Condensed Consolidated Statements of Income and Comprehensive Income (USD $)	3 Months Ended		9 Months Ended
In Thousands, except Per Share data, unless otherwise specified	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	$1.11	$0.75
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_Stateme1

Condensed Consolidated Statements of Cash Flows (USD $)	9 Months Ended
In Thousands, unless otherwise specified	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

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

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

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_Comprehensiv

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			Unrealized Loss			Unfunded			Total
			on Treasury			on Foreign			Employee
			Locks, Net			Exchange			Benefit
						Contracts			Obligations
	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			Nine Months			Affected Line Item in the Statement Where
			Ended			Ended			Net Income is Presented
			September 30,			September 30,
			2013			2013
	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.

StockBased_Compensation

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			Shares			Fair Market
					Value at						Value at
					Date of						Date of
					Grant						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						Nine Months Ended
		September 30,						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

Inventories	9 Months Ended
	Sep. 30, 2013
Inventories	'
	6. Inventories
	The components of inventories are as follows:
		September 30,			December 31,
		2013			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

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	As of September 30, 2013				As of December 31, 2012
		Average
		Remaining Life	Gross		Accumulated		Gross		Accumulated
			Carrying		Amortization		Carrying		Amortization
			Amount				Amount
	(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_Oth

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						Nine Months
		Ended						Ended
		September 30,						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						Nine Months
		Ended						Ended
		September 30,						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

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.

Derivative_Instruments_and_Hed

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).

Fair_Value_Measurements

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		Other		Unobservable
				in active		observable		inputs
				markets for		inputs		(Level 3)
				identical assets		(Level 2)
				(Level 1)
	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

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

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

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

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

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).

Subsequent_Events

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_Policies1

Summary of Accounting Policies (Policies)	9 Months Ended
	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.

Earnings_Per_Share_Tables

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_Comprehensiv1

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			Unrealized Loss			Unfunded			Total
			on Treasury			on Foreign			Employee
			Locks, Net			Exchange			Benefit
						Contracts			Obligations
	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			Nine Months			Affected Line Item in the Statement Where
			Ended			Ended			Net Income is Presented
			September 30,			September 30,
			2013			2013
	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.

StockBased_Compensation_Tables

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			Shares			Fair Market
					Value at						Value at
					Date of						Date of
					Grant						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						Nine Months Ended
		September 30,						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

Inventories (Tables)	9 Months Ended
	Sep. 30, 2013
Components of Inventories	'
	The components of inventories are as follows:
		September 30,			December 31,
		2013			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

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	As of September 30, 2013				As of December 31, 2012
		Average
		Remaining Life	Gross		Accumulated		Gross		Accumulated
			Carrying		Amortization		Carrying		Amortization
			Amount				Amount
	(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_Oth1

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						Nine Months
		Ended						Ended
		September 30,						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						Nine Months
		Ended						Ended
		September 30,						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

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		Other		Unobservable
				in active		observable		inputs
				markets for		inputs		(Level 3)
				identical assets		(Level 2)
				(Level 1)
	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_Policies2

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_Dilut

Computation of Basic and Diluted Income Per Common Share (Detail) (USD $)	3 Months Ended		9 Months Ended
In Thousands, except Per Share data, unless otherwise specified	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

Changes_in_Accumulated_Other_C

Changes in Accumulated Other Comprehensive Income by Component (Detail) (USD $)	3 Months Ended		9 Months Ended
In Thousands, unless otherwise specified	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)	'

Reclassification_Adjustments_O

Reclassification Adjustments Out of Accumulated Other Comprehensive Income (Detail) (USD $)	3 Months Ended			9 Months Ended
In Thousands, unless otherwise specified	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	-1,414	[1]	'	-4,242	[1]	'
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	-8	[2]	'	-25	[2]	'
Provision for income taxes	3		'	10		'
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	-57	[3]	'	-2,965	[3]	'
Curtailment loss	-3,132	[3]	'	-10,908	[3]	'
Amortization of actuarial gains / (losses)	-2,351	[3]	'	-5,622	[3]	'
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_Addit

Stock Based Compensation - Additional Information (Detail) (USD $)	9 Months Ended
In Millions, except Share data, unless otherwise specified	Sep. 30, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'
Long-term equity incentive plan, termination date	19-Oct-14
Long-term equity incentive plan, amendment date	1-May-13
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	1-May-23

Summary_of_Restricted_Stock_Ac

Summary of Restricted Stock Activity (Detail) (Restricted Stock, USD $)	9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012
Restricted Stock	'	'
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_Deta

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

Compensation_Expense_for_Restr

Compensation Expense for Restricted Stock Recognized in Condensed Consolidated Statements of Income (Detail) (USD $)	3 Months Ended		9 Months Ended
In Thousands, unless otherwise specified	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_Deta

Components of Inventories (Detail) (USD $)	Sep. 30, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
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

Components of Other Intangible Assets (Detail) (USD $)	9 Months Ended
In Thousands, unless otherwise specified	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_Cost

Components of Net Pension Costs (Detail) (Pension Plans, USD $)	3 Months Ended			9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2013	Jun. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Pension Plans	'	'	'	'	'
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_Oth2

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

Components_of_Net_Postretireme

Components of Net Postretirement Costs (Detail) (Postretirement Plans, USD $)	3 Months Ended		9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Postretirement Plans	'	'	'	'
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_

Transfers of Financial Assets - Additional Information (Detail) (Receivables Credit Facility, USD $)	Sep. 30, 2013
In Millions, unless otherwise specified
Assets and Associated Liabilities of Transfers Accounted for as Secured Borrowings [Line Items]	'
Credit facility outstanding	$109
Line of Credit	'
Assets and Associated Liabilities of Transfers Accounted for as Secured Borrowings [Line Items]	'
Credit facility borrowing capacity	$200

Derivative_Instruments_and_Hed1

Derivative Instruments and Hedging Activities - Additional Information (Detail) (USD $)	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	'	$65,500,000
Net amount of settlement gains (losses) on derivative instruments included in accumulated OCI to be amortized over next 12 months, before tax	-5,700,000	'
Net amount of settlement gains (losses) on derivative instruments included in accumulated OCI to be amortized over next 12 months, after tax	-3,700,000	'
2008 Interest Rate Protection Agreement	'	'
Derivative [Line Items]	'	'
Proceeds from or (payments to) settlement of interest rate protection agreement	-4,400,000	'
2010 Interest Rate Protection Agreement	'	'
Derivative [Line Items]	'	'
Proceeds from or (payments to) settlement of interest rate protection agreement	9,900,000	'
2011 Interest Rate Protection Agreement	'	'
Derivative [Line Items]	'	'
Proceeds from or (payments to) settlement of interest rate protection agreement	($65,500,000)	'

Assets_and_Liabilities_Measure

Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) (Cash and Cash Equivalents, USD $)	Sep. 30, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
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_Additi

Fair Value Measurements - Additional Information (Detail) (USD $)	Sep. 30, 2013	Dec. 31, 2012
In Millions, unless otherwise specified
Fair Value Measurements [Line Items]	'	'
Long-term debt, carrying value	$782.40	$793.60
Long-term debt, fair value	$787.40	$825

Environmental_Liabilities_Addi

Environmental Liabilities - Additional Information (Detail) (USD $)	6 Months Ended
In Millions, unless otherwise specified	Sep. 30, 2013
Site Contingency [Line Items]	'
Remediation costs	$3.20
Environmental reserve	$12.20

Stock_Repurchase_Program_Addit

Stock Repurchase Program - Additional Information (Detail) (USD $)	9 Months Ended	12 Months Ended
In Millions, except Share data, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2011
Stock Repurchase Program [Line Items]	'	'
Common stock repurchase authorized amount	'	$150
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	$98.10	'

Alternative_Energy_Tax_Credits1

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

Legal_Proceedings_Additional_I

Legal Proceedings - Additional Information (Detail)	2 Months Ended
	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_Informa

Acquisition - Additional Information (Detail) (USD $)	9 Months Ended		1 Months Ended		1 Months Ended		1 Months Ended
In Millions, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2013	Mar. 31, 2012	Mar. 16, 2012	Mar. 31, 2012	Mar. 16, 2012	Mar. 31, 2012	Mar. 16, 2012
	Customer Relationships	Other Intangible Assets	Packaging Specialists	Packaging Specialists	Packaging Specialists	Packaging Specialists	Packaging Specialists	Packaging Specialists
					Customer Relationships	Customer Relationships	Other Intangible Assets	Other Intangible Assets
Business Acquisition [Line Items]	'	'	'	'	'	'	'	'
Business acquisition, cost of acquired entity	'	'	$35.40	'	'	'	'	'
Purchase price allocation to goodwill deductible for tax purposes	'	'	'	9.6	'	'	'	'
Purchase price allocation to intangible assets	'	'	'	'	'	$15.50	'	$0.60
Intangible asset, useful life, in years	'16 years 3 months 18 days	'2 years 3 months 18 days	'	'	'15 years	'	'4 years	'

Subsequent_Events_Additional_I

Subsequent Events - Additional Information (Detail) (USD $)	9 Months Ended		12 Months Ended		1 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Dec. 31, 2012	Sep. 30, 2013	Oct. 25, 2013	Oct. 25, 2013	Oct. 25, 2013	Oct. 25, 2013
	T		Boise Incorporation	Boise Incorporation	Subsequent Event	Subsequent Event	Subsequent Event	Subsequent Event
					T	Boise Incorporation	Boise Incorporation	Boise Incorporation
							Term LoanA Facility	4.50% notes
Subsequent Event [Line Items]	'	'	'	'	'	'	'	'
Net sales reported by acquired entity for last fiscal year	'	'	$2,600,000,000	'	'	'	'	'
Business acquisition common shares outstanding, per share	'	'	'	'	'	$12.55	'	'
Business acquisition, outstanding indebtedness	'	'	'	'	'	775,000,000	'	'
Business combination, transaction value	'	'	'	'	'	1,940,000,000	'	'
Business acquisition, transaction cost	'	'	'	4,200,000	'	'	'	'
Senior notes, redemption premium	'	-21,296,000	'	'	'	55,700,000	'	'
New borrowings	'	'	'	'	'	$2,000,000,000	$1,300,000,000	$700
Note interest rate	'	'	'	'	'	'	'	4.50%
Note maturity period	'	'	'	'	'	'	'	'10 years
Estimated production capacity	2,600,000	'	'	'	3,700,000	'	'	'
Corrugated products volume percentage increase	'	'	'	'	30.00%	'	'	'