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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 |  | $ 2,355,400,000 us-gaap_LongTermDebt |  | $ 2,547,800,000 us-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 |  | 1,646,900,000 us-gaap_LongtermDebtPercentageBearingFixedInterestAmount |  |  |  |  |  |  |  |  |  |  |  |  |
Book value of variable rate debt |  | 708,500,000 us-gaap_LongtermDebtPercentageBearingVariableInterestAmount |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt, fair value |  | 1,707,500,000 us-gaap_LongTermDebtFairValue |  |  |  |  |  |  |  |  |  |  |  |  |
Repayment of debt | 953,600,000 us-gaap_ExtinguishmentOfDebtAmount |  |  |  |  |  |  |  |  |  |  |  |  |  |
Senior notes, redemption premium |  | 0 us-gaap_GainsLossesOnExtinguishmentOfDebt |  | 0 us-gaap_GainsLossesOnExtinguishmentOfDebt |  | (21,300,000)us-gaap_GainsLossesOnExtinguishmentOfDebt |  |  |  |  |  |  |  |  |
Annual Principal Maturities for Debt [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2015 |  | 6,500,000 us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths |  |  |  |  |  |  |  |  |  |  |  |  |
2016 |  | 6,500,000 us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo |  |  |  |  |  |  |  |  |  |  |  |  |
2017 |  | 6,500,000 us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree |  |  |  |  |  |  |  |  |  |  |  |  |
2018 |  | 221,500,000 us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour |  |  |  |  |  |  |  |  |  |  |  |  |
2019 |  | 6,500,000 us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive |  |  |  |  |  |  |  |  |  |  |  |  |
2020 and thereafter |  | 2,100,000,000 us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearFive |  |  |  |  |  |  |  |  |  |  |  |  |
Interest payments |  | 77,000,000 us-gaap_InterestPaid |  |  |  |  |  |  |  |  |  |  |  |  |
Interest payments and redemption premium payments paid for debt obligations |  |  |  | 105,700,000 pkg_InterestPaymentsandRedemptionPremiumPayments |  | 66,300,000 pkg_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 |  | 3,300,000 us-gaap_AmortizationOfFinancingCosts |  | 10,300,000 us-gaap_AmortizationOfFinancingCosts |  | 1,100,000 us-gaap_AmortizationOfFinancingCosts |  |  |  |  |  |  |  |  |
Write-off of deferred financing costs |  | 88,400,000 us-gaap_InterestIncomeExpenseNonoperatingNet | [1] | 58,300,000 us-gaap_InterestIncomeExpenseNonoperatingNet | [2],[3] | 62,900,000 us-gaap_InterestIncomeExpenseNonoperatingNet | [4] |  |  |  |  |  |  |  |
Boise Inc. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repayment of debt | 829,800,000 us-gaap_ExtinguishmentOfDebtAmount / us-gaap_BusinessAcquisitionAxis = pkg_BoiseInc.Member |  |  |  |  |  |  |  |  |  |  |  |  |  |
Annual Principal Maturities for Debt [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest payments and redemption premium payments paid for debt obligations |  |  |  | 54,800,000 pkg_InterestPaymentsandRedemptionPremiumPayments / us-gaap_BusinessAcquisitionAxis = pkg_BoiseInc.Member |  |  |  |  |  |  |  |  |  |  |
Amortization of financing costs |  |  |  | 8,200,000 us-gaap_AmortizationOfFinancingCosts / us-gaap_BusinessAcquisitionAxis = pkg_BoiseInc.Member |  |  |  |  |  |  |  |  |  |  |
Line of Credit |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Credit facility borrowing capacity |  |  |  |  |  |  |  | 350,000,000.0 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_LongtermDebtTypeAxis = us-gaap_LineOfCreditMember |  |  |  |  |  |  |
Unused borrowing capacity |  | 325,100,000 us-gaap_DebtInstrumentUnusedBorrowingCapacityAmount / us-gaap_LongtermDebtTypeAxis = us-gaap_LineOfCreditMember |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt |  | 0 us-gaap_LongTermDebt / us-gaap_LongtermDebtTypeAxis = us-gaap_LineOfCreditMember |  | 0 us-gaap_LongTermDebt / us-gaap_LongtermDebtTypeAxis = us-gaap_LineOfCreditMember |  |  |  |  |  |  |  |  |  |  |
Stated interest rate |  | 0.00%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_LongtermDebtTypeAxis = us-gaap_LineOfCreditMember |  | 0.00%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_LongtermDebtTypeAxis = us-gaap_LineOfCreditMember |  |  |  |  |  |  |  |  |  |  |
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 |  |  |  |  |  |  |  | 1,650,000,000 us-gaap_DebtInstrumentFaceAmount / us-gaap_DebtInstrumentAxis = pkg_FiveYearandSevenYearTermLoansdueOctober2018and2020respectivelyMember / us-gaap_LongtermDebtTypeAxis = us-gaap_UnsecuredDebtMember |  |  |  |  |  |  |
Repayment of debt |  | 591,500,000 us-gaap_ExtinguishmentOfDebtAmount / us-gaap_DebtInstrumentAxis = pkg_FiveYearandSevenYearTermLoansdueOctober2018and2020respectivelyMember / us-gaap_LongtermDebtTypeAxis = us-gaap_UnsecuredDebtMember |  |  |  |  |  |  |  |  |  |  |  |  |
Five-Year Term Loan, due October 2018 | Unsecured Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt, face amount |  |  |  |  |  |  |  | 650,000,000.0 us-gaap_DebtInstrumentFaceAmount / us-gaap_DebtInstrumentAxis = pkg_TermloanDueOctober2018Member / us-gaap_LongtermDebtTypeAxis = us-gaap_UnsecuredDebtMember |  |  |  |  |  |  |
Applicable margin |  | 1.375%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_DebtInstrumentAxis = pkg_TermloanDueOctober2018Member / us-gaap_LongtermDebtTypeAxis = us-gaap_UnsecuredDebtMember |  | 1.375%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_DebtInstrumentAxis = pkg_TermloanDueOctober2018Member / us-gaap_LongtermDebtTypeAxis = us-gaap_UnsecuredDebtMember |  |  |  | 1.375%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_DebtInstrumentAxis = pkg_TermloanDueOctober2018Member / us-gaap_LongtermDebtTypeAxis = us-gaap_UnsecuredDebtMember |  |  |  |  |  |  |
Long-term debt |  | 65,000,000 us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = pkg_TermloanDueOctober2018Member / us-gaap_LongtermDebtTypeAxis = us-gaap_UnsecuredDebtMember |  | 650,000,000 us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = pkg_TermloanDueOctober2018Member / us-gaap_LongtermDebtTypeAxis = us-gaap_UnsecuredDebtMember |  |  |  |  |  |  |  |  |  |  |
Seven-Year Term Loan, due October 2020 | Unsecured Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt, face amount |  |  |  |  |  |  |  | 650,000,000.0 us-gaap_DebtInstrumentFaceAmount / us-gaap_DebtInstrumentAxis = pkg_TermloanDueOctober2020Member / us-gaap_LongtermDebtTypeAxis = us-gaap_UnsecuredDebtMember |  |  |  |  |  |  |
Applicable margin |  | 1.625%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_DebtInstrumentAxis = pkg_TermloanDueOctober2020Member / us-gaap_LongtermDebtTypeAxis = us-gaap_UnsecuredDebtMember |  | 1.625%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_DebtInstrumentAxis = pkg_TermloanDueOctober2020Member / us-gaap_LongtermDebtTypeAxis = us-gaap_UnsecuredDebtMember |  |  |  | 1.625%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_DebtInstrumentAxis = pkg_TermloanDueOctober2020Member / us-gaap_LongtermDebtTypeAxis = us-gaap_UnsecuredDebtMember |  |  |  |  |  |  |
Long-term debt |  | 643,500,000 us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = pkg_TermloanDueOctober2020Member / us-gaap_LongtermDebtTypeAxis = us-gaap_UnsecuredDebtMember |  | 650,000,000 us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = pkg_TermloanDueOctober2020Member / us-gaap_LongtermDebtTypeAxis = us-gaap_UnsecuredDebtMember |  |  |  |  |  |  |  |  |  |  |
6.50% Senior Notes due March 2018 | Senior Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt, face amount |  |  |  |  |  |  |  |  |  |  | 150,000,000.0 us-gaap_DebtInstrumentFaceAmount / us-gaap_DebtInstrumentAxis = pkg_SeniorNotesSixPointFivePercentageSeniorNotesMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember |  |  |  |
Long-term debt |  | 150,000,000 us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = pkg_SeniorNotesSixPointFivePercentageSeniorNotesMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember |  | 150,000,000 us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = pkg_SeniorNotesSixPointFivePercentageSeniorNotesMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember |  |  |  |  |  |  |  |  |  |  |
Stated interest rate |  | 6.50%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = pkg_SeniorNotesSixPointFivePercentageSeniorNotesMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember |  | 6.50%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = pkg_SeniorNotesSixPointFivePercentageSeniorNotesMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember |  |  |  |  |  |  | 6.50%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = pkg_SeniorNotesSixPointFivePercentageSeniorNotesMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember |  |  |  |
3.90% Senior Notes, due June 2022 | Senior Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt, face amount |  |  |  |  |  |  |  |  |  |  |  | 400,000,000.0 us-gaap_DebtInstrumentFaceAmount / us-gaap_DebtInstrumentAxis = pkg_SeniorNotesThreePointNinePercentageSeniorNotesMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember |  |  |
Long-term debt |  | 399,700,000 us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = pkg_SeniorNotesThreePointNinePercentageSeniorNotesMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember |  | 399,700,000 us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = pkg_SeniorNotesThreePointNinePercentageSeniorNotesMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember |  |  |  |  |  |  |  |  |  |  |
Stated interest rate |  | 3.90%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = pkg_SeniorNotesThreePointNinePercentageSeniorNotesMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember |  | 3.90%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = pkg_SeniorNotesThreePointNinePercentageSeniorNotesMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember |  |  |  |  |  |  |  | 3.90%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = pkg_SeniorNotesThreePointNinePercentageSeniorNotesMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember |  |  |
4.50% Senior Notes, due November 2023 | Senior Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt, face amount |  |  |  |  |  |  |  |  |  |  |  |  | 700,000,000.0 us-gaap_DebtInstrumentFaceAmount / us-gaap_DebtInstrumentAxis = pkg_A4.50SeniorNotesDueNovember2023Member / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember |  |
Long-term debt |  | 698,300,000 us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = pkg_A4.50SeniorNotesDueNovember2023Member / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember |  | 698,100,000 us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = pkg_A4.50SeniorNotesDueNovember2023Member / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember |  |  |  |  |  |  |  |  |  |  |
Stated interest rate |  | 4.50%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = pkg_A4.50SeniorNotesDueNovember2023Member / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember |  | 4.50%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = pkg_A4.50SeniorNotesDueNovember2023Member / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember |  |  |  |  |  |  |  |  | 4.50%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = pkg_A4.50SeniorNotesDueNovember2023Member / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember |  |
3.65% Senior Notes, due September 2024 | Senior Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt, face amount |  |  |  |  |  |  |  |  |  |  |  |  |  | 400,000,000.0 us-gaap_DebtInstrumentFaceAmount / us-gaap_DebtInstrumentAxis = pkg_A3.65SeniorNotesdueSeptember2024Member / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember |
Long-term debt |  | 398,900,000 us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = pkg_A3.65SeniorNotesdueSeptember2024Member / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember |  | 0 us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = pkg_A3.65SeniorNotesdueSeptember2024Member / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember |  |  |  |  |  |  |  |  |  |  |
Stated interest rate |  | 3.65%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = pkg_A3.65SeniorNotesdueSeptember2024Member / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember |  | 0.00%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = pkg_A3.65SeniorNotesdueSeptember2024Member / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember |  |  |  |  |  |  |  |  |  | 3.65%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = pkg_A3.65SeniorNotesdueSeptember2024Member / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember |
5.75% Senior Notes, due August 2013 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Senior notes, redemption premium |  |  |  | (21,300,000)us-gaap_GainsLossesOnExtinguishmentOfDebt / us-gaap_DebtInstrumentAxis = pkg_SeniorNotesFivePointSevenFivePercentageSeniorNotesMember |  |  |  |  |  |  |  |  |  |  |
Senior notes, accrued and unpaid interest |  |  |  |  |  |  |  |  | 11,200,000 us-gaap_InterestPayableCurrentAndNoncurrent / us-gaap_DebtInstrumentAxis = pkg_SeniorNotesFivePointSevenFivePercentageSeniorNotesMember |  |  |  |  |  |
5.75% Senior Notes, due August 2013 | Senior Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stated interest rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5.75%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = pkg_SeniorNotesFivePointSevenFivePercentageSeniorNotesMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember
Repayment of debt |  |  |  |  |  |  |  |  | 432,500,000 us-gaap_ExtinguishmentOfDebtAmount / us-gaap_DebtInstrumentAxis = pkg_SeniorNotesFivePointSevenFivePercentageSeniorNotesMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember |  |  |  |  |  |
Letter of Credit | Line of Credit |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Outstanding letters of credit |  | 24,900,000 us-gaap_LettersOfCreditOutstandingAmount / us-gaap_CreditFacilityAxis = us-gaap_LetterOfCreditMember / us-gaap_LongtermDebtTypeAxis = us-gaap_LineOfCreditMember |  |  |  |  |  |  |  |  |  |  |  |  |
Receivables Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repayment of debt |  |  |  | 109,000,000 us-gaap_ExtinguishmentOfDebtAmount / us-gaap_CreditFacilityAxis = pkg_ReceivablesCreditFacilityMember |  |  |  |  |  |  |  |  |  |  |
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 |  | $ 1,500,000 us-gaap_InterestIncomeExpenseNonoperatingNet / pkg_TypeofCostAxis = pkg_WriteOffofDeferredFinancingCostsMember |  |  |  |  |  |  |  |  |  |  |  |  |
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 / us-gaap_DebtInstrumentAxis = pkg_TermloanDueOctober2018Member / us-gaap_LongtermDebtTypeAxis = us-gaap_UnsecuredDebtMember / us-gaap_VariableRateAxis = us-gaap_LondonInterbankOfferedRateLIBORMember |  | 1.54%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = pkg_TermloanDueOctober2018Member / us-gaap_LongtermDebtTypeAxis = us-gaap_UnsecuredDebtMember / us-gaap_VariableRateAxis = us-gaap_LondonInterbankOfferedRateLIBORMember |  |  |  |  |  |  |  |  |  |  |
Annual Principal Maturities for Debt [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reference Interest Rate |  | 0.17%pkg_ReferenceInterestRate / us-gaap_DebtInstrumentAxis = pkg_TermloanDueOctober2018Member / us-gaap_LongtermDebtTypeAxis = us-gaap_UnsecuredDebtMember / us-gaap_VariableRateAxis = us-gaap_LondonInterbankOfferedRateLIBORMember |  | 0.17%pkg_ReferenceInterestRate / us-gaap_DebtInstrumentAxis = pkg_TermloanDueOctober2018Member / us-gaap_LongtermDebtTypeAxis = us-gaap_UnsecuredDebtMember / us-gaap_VariableRateAxis = us-gaap_LondonInterbankOfferedRateLIBORMember |  |  |  |  |  |  |  |  |  |  |
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 / us-gaap_DebtInstrumentAxis = pkg_TermloanDueOctober2020Member / us-gaap_LongtermDebtTypeAxis = us-gaap_UnsecuredDebtMember / us-gaap_VariableRateAxis = us-gaap_LondonInterbankOfferedRateLIBORMember |  | 1.79%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = pkg_TermloanDueOctober2020Member / us-gaap_LongtermDebtTypeAxis = us-gaap_UnsecuredDebtMember / us-gaap_VariableRateAxis = us-gaap_LondonInterbankOfferedRateLIBORMember |  |  |  |  |  |  |  |  |  |  |
Annual Principal Maturities for Debt [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reference Interest Rate |  | 0.17%pkg_ReferenceInterestRate / us-gaap_DebtInstrumentAxis = pkg_TermloanDueOctober2020Member / us-gaap_LongtermDebtTypeAxis = us-gaap_UnsecuredDebtMember / us-gaap_VariableRateAxis = us-gaap_LondonInterbankOfferedRateLIBORMember |  | 0.17%pkg_ReferenceInterestRate / us-gaap_DebtInstrumentAxis = pkg_TermloanDueOctober2020Member / us-gaap_LongtermDebtTypeAxis = us-gaap_UnsecuredDebtMember / us-gaap_VariableRateAxis = us-gaap_LondonInterbankOfferedRateLIBORMember |  |  |  |  |  |  |  |  |  |  |
[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.

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