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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 | $ 0 us-gaap_PaymentsForProceedsFromHedgeFinancingActivities | $ 0 us-gaap_PaymentsForProceedsFromHedgeFinancingActivities | $ 65.5 us-gaap_PaymentsForProceedsFromHedgeFinancingActivities |  |  |  |  |  |
Foreign currency forward contracts settled for a loss, amount |  |  |  | 0.7 pkg_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 |  |  |  |  | 2.2 us-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 |  |  |  |  |  |  | 4.4 us-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 |  |  | 65.5 us-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

X
- Definition The estimated net amount of existing gains or losses on cash flow hedges at the reporting date expected to be reclassified to earnings within the next 12 months, net of tax. + References No definition available. + Details
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- Definition Amount of loss recorded in accumulated other comprehensive income pertaining to the settlement of foreign currency exchange rate derivatives designated as cash flow hedging instruments to the extent that a cash flow hedge is determined to be effective. + References No definition available. + Details
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- Definition The estimated net amount of existing gains or losses on cash flow hedges at the reporting date expected to be reclassified to earnings within the next 12 months. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=35736893&loc=d3e80748-113994 + Details
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- Definition Amount of increase in the fair value of derivatives recognized in the income statement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5618551-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (a),(c),(d),(e) -URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5624171-113959 + Details
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- Definition The portion of gains and losses (net) on derivative instruments designated and qualifying as hedging instruments representing (a) the amount of the hedge ineffectiveness and (b) the amount, if any, excluded from the assessment of hedge effectiveness. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5624171-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 25 -Section 50 -Paragraph 1 -Subparagraph (a)(1),(2) -URI http://asc.fasb.org/extlink&oid=6886632&loc=d3e76258-113986 + Details
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- Definition The net cash outflow or inflow for a financial contract that meets the hedge criteria as either cash flow hedge, fair value hedge or hedge of net investment in foreign operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3095-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 9 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3098-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 27 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3581-108585 + Details
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