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Debt - Additional Information (Detail) (USD $)
 1 Months Ended 12 Months Ended 0 Months Ended
Oct. 31, 2013
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Oct. 18, 2013
Jul. 26, 2012
Dec. 23, 2013
Mar. 25, 2008
Jun. 26, 2012
Oct. 22, 2013
Sep. 05, 2014
Jul. 21, 2003
Debt Instrument [Line Items]                        
Long-term debt   $ 2,355,400,000us-gaap_LongTermDebt $ 2,547,800,000us-gaap_LongTermDebt                  
Financing costs paid   (3,400,000)us-gaap_PaymentsOfFinancingCosts (19,400,000)us-gaap_PaymentsOfFinancingCosts (800,000)us-gaap_PaymentsOfFinancingCosts                
Book value of fixed rate debt   1,646,900,000us-gaap_LongtermDebtPercentageBearingFixedInterestAmount                    
Book value of variable rate debt   708,500,000us-gaap_LongtermDebtPercentageBearingVariableInterestAmount                    
Long-term debt, fair value   1,707,500,000us-gaap_LongTermDebtFairValue                    
Repayment of debt 953,600,000us-gaap_ExtinguishmentOfDebtAmount                      
Senior notes, redemption premium   0us-gaap_GainsLossesOnExtinguishmentOfDebt 0us-gaap_GainsLossesOnExtinguishmentOfDebt (21,300,000)us-gaap_GainsLossesOnExtinguishmentOfDebt                
Annual Principal Maturities for Debt [Abstract]                        
2015   6,500,000us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths                    
2016   6,500,000us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo                    
2017   6,500,000us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree                    
2018   221,500,000us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour                    
2019   6,500,000us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive                    
2020 and thereafter   2,100,000,000us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearFive                    
Interest payments   77,000,000us-gaap_InterestPaid                    
Interest payments and redemption premium payments paid for debt obligations     105,700,000pkg_InterestPaymentsandRedemptionPremiumPayments 66,300,000pkg_InterestPaymentsandRedemptionPremiumPayments                
Amortization of net (loss) gain on treasury lock   (5,700,000)us-gaap_DerivativeGainLossOnDerivativeNet (5,700,000)us-gaap_DerivativeGainLossOnDerivativeNet (3,000,000)us-gaap_DerivativeGainLossOnDerivativeNet                
Amortization of financing costs   3,300,000us-gaap_AmortizationOfFinancingCosts 10,300,000us-gaap_AmortizationOfFinancingCosts 1,100,000us-gaap_AmortizationOfFinancingCosts                
Write-off of deferred financing costs   88,400,000us-gaap_InterestIncomeExpenseNonoperatingNet [1] 58,300,000us-gaap_InterestIncomeExpenseNonoperatingNet [2],[3] 62,900,000us-gaap_InterestIncomeExpenseNonoperatingNet [4]                
Boise Inc.                        
Debt Instrument [Line Items]                        
Repayment of debt 829,800,000us-gaap_ExtinguishmentOfDebtAmount
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Annual Principal Maturities for Debt [Abstract]                        
Interest payments and redemption premium payments paid for debt obligations     54,800,000pkg_InterestPaymentsandRedemptionPremiumPayments
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Amortization of financing costs     8,200,000us-gaap_AmortizationOfFinancingCosts
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Line of Credit                        
Debt Instrument [Line Items]                        
Credit facility borrowing capacity         350,000,000.0us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
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Unused borrowing capacity   325,100,000us-gaap_DebtInstrumentUnusedBorrowingCapacityAmount
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Long-term debt   0us-gaap_LongTermDebt
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Stated interest rate   0.00%us-gaap_DebtInstrumentInterestRateStatedPercentage
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Credit facility, expiration date   Oct. 18, 2018                    
Five-Year and Seven-Year Term Loans, due October 2018 and 2020, respectively | Unsecured Debt                        
Debt Instrument [Line Items]                        
Debt, face amount         1,650,000,000us-gaap_DebtInstrumentFaceAmount
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Repayment of debt   591,500,000us-gaap_ExtinguishmentOfDebtAmount
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Five-Year Term Loan, due October 2018 | Unsecured Debt                        
Debt Instrument [Line Items]                        
Debt, face amount         650,000,000.0us-gaap_DebtInstrumentFaceAmount
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Applicable margin   1.375%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
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Long-term debt   65,000,000us-gaap_LongTermDebt
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Seven-Year Term Loan, due October 2020 | Unsecured Debt                        
Debt Instrument [Line Items]                        
Debt, face amount         650,000,000.0us-gaap_DebtInstrumentFaceAmount
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Applicable margin   1.625%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
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Long-term debt   643,500,000us-gaap_LongTermDebt
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= us-gaap_UnsecuredDebtMember		 650,000,000us-gaap_LongTermDebt
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6.50% Senior Notes due March 2018 | Senior Notes                        
Debt Instrument [Line Items]                        
Debt, face amount               150,000,000.0us-gaap_DebtInstrumentFaceAmount
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Long-term debt   150,000,000us-gaap_LongTermDebt
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Stated interest rate   6.50%us-gaap_DebtInstrumentInterestRateStatedPercentage
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= us-gaap_SeniorNotesMember		         6.50%us-gaap_DebtInstrumentInterestRateStatedPercentage
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3.90% Senior Notes, due June 2022 | Senior Notes                        
Debt Instrument [Line Items]                        
Debt, face amount                 400,000,000.0us-gaap_DebtInstrumentFaceAmount
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Long-term debt   399,700,000us-gaap_LongTermDebt
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= us-gaap_SeniorNotesMember		 399,700,000us-gaap_LongTermDebt
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Stated interest rate   3.90%us-gaap_DebtInstrumentInterestRateStatedPercentage
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4.50% Senior Notes, due November 2023 | Senior Notes                        
Debt Instrument [Line Items]                        
Debt, face amount                   700,000,000.0us-gaap_DebtInstrumentFaceAmount
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Long-term debt   698,300,000us-gaap_LongTermDebt
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= us-gaap_SeniorNotesMember		 698,100,000us-gaap_LongTermDebt
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Stated interest rate   4.50%us-gaap_DebtInstrumentInterestRateStatedPercentage
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= us-gaap_SeniorNotesMember		             4.50%us-gaap_DebtInstrumentInterestRateStatedPercentage
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3.65% Senior Notes, due September 2024 | Senior Notes                        
Debt Instrument [Line Items]                        
Debt, face amount                     400,000,000.0us-gaap_DebtInstrumentFaceAmount
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Long-term debt   398,900,000us-gaap_LongTermDebt
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Stated interest rate   3.65%us-gaap_DebtInstrumentInterestRateStatedPercentage
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5.75% Senior Notes, due August 2013                        
Debt Instrument [Line Items]                        
Senior notes, redemption premium     (21,300,000)us-gaap_GainsLossesOnExtinguishmentOfDebt
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Senior notes, accrued and unpaid interest           11,200,000us-gaap_InterestPayableCurrentAndNoncurrent
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5.75% Senior Notes, due August 2013 | Senior Notes                        
Debt Instrument [Line Items]                        
Stated interest rate                       5.75%us-gaap_DebtInstrumentInterestRateStatedPercentage
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Repayment of debt           432,500,000us-gaap_ExtinguishmentOfDebtAmount
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Letter of Credit | Line of Credit                        
Debt Instrument [Line Items]                        
Outstanding letters of credit   24,900,000us-gaap_LettersOfCreditOutstandingAmount
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Receivables Credit Facility                        
Debt Instrument [Line Items]                        
Repayment of debt     109,000,000us-gaap_ExtinguishmentOfDebtAmount
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Credit facility, expiration date             Oct. 11, 2014          
Write-Off of Deferred Financing Costs                        
Annual Principal Maturities for Debt [Abstract]                        
Write-off of deferred financing costs   $ 1,500,000us-gaap_InterestIncomeExpenseNonoperatingNet
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London Interbank Offered Rate (LIBOR) | Five-Year Term Loan, due October 2018 | Unsecured Debt                        
Debt Instrument [Line Items]                        
Stated interest rate   1.54%us-gaap_DebtInstrumentInterestRateStatedPercentage
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Annual Principal Maturities for Debt [Abstract]                        
Reference Interest Rate   0.17%pkg_ReferenceInterestRate
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London Interbank Offered Rate (LIBOR) | Seven-Year Term Loan, due October 2020 | Unsecured Debt                        
Debt Instrument [Line Items]                        
Stated interest rate   1.79%us-gaap_DebtInstrumentInterestRateStatedPercentage
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[1] Includes $1.5 million of expense related to the write-off of deferred financing costs in connection with the debt refinancing discussed in Note 10, Debt.
[2] Includes $10.5 million of expenses for financing the acquisition and $1.1 million of expense for the write-off of deferred financing costs.
[3] On October 25, 2013, we acquired Boise Inc. (Boise). Our financial results include Boise subsequent to acquisition.
[4] Includes $24.8 million of debt refinancing charges, including a $21.3 million redemption premium, a $3.4 million charge to settle the treasury lock prior to its maturity, and $0.1 million of other items.