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Derivative Instruments and Hedging Activities - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
12 Months Ended 9 Months Ended 12 Months Ended 6 Months Ended 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Sep. 30, 2012
Dec. 31, 2003
Dec. 31, 2008
Jun. 30, 2012
Dec. 31, 2015
Derivative [Line Items]                  
Payments for (Proceeds from) settlement of interest rate protection agreement $ 0us-gaap_PaymentsForProceedsFromHedgeFinancingActivities $ 0us-gaap_PaymentsForProceedsFromHedgeFinancingActivities $ 65.5us-gaap_PaymentsForProceedsFromHedgeFinancingActivities            
Foreign currency forward contracts settled for a loss, amount       0.7pkg_LossOnForeignCurrencyCashFlowHedgeDerivatives          
2003 Interest Rate Protection Agreement                  
Derivative [Line Items]                  
Payments for (Proceeds from) settlement of interest rate protection agreement           (22.8)us-gaap_PaymentsForProceedsFromHedgeFinancingActivities
/ us-gaap_DerivativeByNatureAxis
= pkg_TwoThousandAndThreeInterestRateProtectionAgreementMember
     
Settlement gains from interest rate protection agreement         2.2us-gaap_DerivativeGainOnDerivative
/ us-gaap_DerivativeByNatureAxis
= pkg_TwoThousandAndThreeInterestRateProtectionAgreementMember
       
2008 Interest Rate Protection Agreement                  
Derivative [Line Items]                  
Payments for (Proceeds from) settlement of interest rate protection agreement             4.4us-gaap_PaymentsForProceedsFromHedgeFinancingActivities
/ us-gaap_DerivativeByNatureAxis
= pkg_TwoThousandAndEightInterestRateProtectionAgreementMember
   
2010 Interest Rate Protection Agreement                  
Derivative [Line Items]                  
Payments for (Proceeds from) settlement of interest rate protection agreement       (9.9)us-gaap_PaymentsForProceedsFromHedgeFinancingActivities
/ us-gaap_DerivativeByNatureAxis
= pkg_TwoThousandAndTenInterestRateProtectionAgreementMember
         
2011 Interest Rate Protection Agreement                  
Derivative [Line Items]                  
Payments for (Proceeds from) settlement of interest rate protection agreement     65.5us-gaap_PaymentsForProceedsFromHedgeFinancingActivities
/ us-gaap_DerivativeByNatureAxis
= pkg_TwoThousandAndElevenInterestRateProtectionAgreementMember
           
Ineffective portion of derivative instruments               (3.4)us-gaap_DerivativeInstrumentsGainLossRecognizedInIncomeIneffectivePortionAndAmountExcludedFromEffectivenessTestingNet
/ us-gaap_DerivativeByNatureAxis
= pkg_TwoThousandAndElevenInterestRateProtectionAgreementMember
 
Scenario, Forecast                  
Derivative [Line Items]                  
Net amount of settlement gains (losses) on derivative instruments included in accumulated OCI to be amortized over next 12 months, before tax                 (5.7)us-gaap_CashFlowHedgeGainLossToBeReclassifiedWithinTwelveMonths
/ us-gaap_StatementScenarioAxis
= us-gaap_ScenarioForecastMember
Net amount of settlement gains (losses) on derivative instruments included in accumulated OCI to be amortized over next 12 months, after tax                 $ (3.4)pkg_CashFlowHedgeGainLossToBeReclassifiedWithinTwelveMonthsNetOfTax
/ us-gaap_StatementScenarioAxis
= us-gaap_ScenarioForecastMember