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Alternative Energy Tax Credits - Additional Information (Detail) (USD $) | 12 Months Ended | 3 Months Ended | 12 Months Ended | 3 Months Ended |
--- | --- | --- | --- | --- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2013 | Mar. 31, 2012 | Dec. 31, 2010 | Dec. 31, 2012 | Dec. 31, 2009
Alternative Energy Tax Credits [Line Items] |  |  |  |  |  |  |  |
(Provision) benefit for income taxes | $ (221,700,000)us-gaap_IncomeTaxExpenseBenefit | $ 17,700,000 us-gaap_IncomeTaxExpenseBenefit | $ (214,500,000)us-gaap_IncomeTaxExpenseBenefit |  |  |  |  |
Uncertain tax positions |  |  |  |  |  | 102,000,000 pkg_IncreaseDecreaseDuringPeriodReserveForUncertainTaxPositions |  |
Cellulosic Biofuel Tax Credits |  |  |  |  |  |  |  |
Alternative Energy Tax Credits [Line Items] |  |  |  |  |  |  |  |
Refundable tax credit per gallon |  |  |  |  |  |  |  | 1.01 pkg_TaxCreditPerGallon / us-gaap_TaxCreditCarryforwardAxis = pkg_CellulosicBiofuelTaxCreditsMember
(Provision) benefit for income taxes |  |  |  | (103,900,000)us-gaap_IncomeTaxExpenseBenefit / us-gaap_TaxCreditCarryforwardAxis = pkg_CellulosicBiofuelTaxCreditsMember | (118,500,000)us-gaap_IncomeTaxExpenseBenefit / us-gaap_TaxCreditCarryforwardAxis = pkg_CellulosicBiofuelTaxCreditsMember | 135,500,000 us-gaap_IncomeTaxExpenseBenefit / us-gaap_TaxCreditCarryforwardAxis = pkg_CellulosicBiofuelTaxCreditsMember |  |
Alternative Energy Tax Credits |  |  |  |  |  |  |  |
Alternative Energy Tax Credits [Line Items] |  |  |  |  |  |  |  |
Refundable tax credit per gallon |  |  |  |  |  |  |  | 0.50 pkg_TaxCreditPerGallon / us-gaap_TaxCreditCarryforwardAxis = pkg_AlternativeEnergyTaxCreditsMember
Alternative energy tax credits |  |  |  |  | 95,500,000 pkg_AlternativeFuelMixtureCredits / us-gaap_TaxCreditCarryforwardAxis = pkg_AlternativeEnergyTaxCreditsMember | (86,300,000)pkg_AlternativeFuelMixtureCredits / us-gaap_TaxCreditCarryforwardAxis = pkg_AlternativeEnergyTaxCreditsMember |  |
(Provision) benefit for income taxes |  |  |  | (62,100,000)us-gaap_IncomeTaxExpenseBenefit / us-gaap_TaxCreditCarryforwardAxis = pkg_AlternativeEnergyTaxCreditsMember |  |  |  |
Income (charge) related to alternative energy tax credits |  |  | (19,600,000)pkg_AlternativeEnergyTaxCredits / us-gaap_TaxCreditCarryforwardAxis = pkg_AlternativeEnergyTaxCreditsMember |  | (23,000,000)pkg_AlternativeEnergyTaxCredits / us-gaap_TaxCreditCarryforwardAxis = pkg_AlternativeEnergyTaxCreditsMember | 47,700,000 pkg_AlternativeEnergyTaxCredits / us-gaap_TaxCreditCarryforwardAxis = pkg_AlternativeEnergyTaxCreditsMember | 3,400,000 pkg_AlternativeEnergyTaxCredits / us-gaap_TaxCreditCarryforwardAxis = pkg_AlternativeEnergyTaxCreditsMember |
Alternative Energy Tax Credits | Additional |  |  |  |  |  |  |  |
Alternative Energy Tax Credits [Line Items] |  |  |  |  |  |  |  |
Expenses related to alternative energy tax credits |  |  |  |  |  | 1,600,000 pkg_ExpensesRelatedToAlternativeEnergyTaxCredits / pkg_IncomeTaxCreditsAndAdjustmentsAxis = pkg_AdditionalMember / us-gaap_TaxCreditCarryforwardAxis = pkg_AlternativeEnergyTaxCreditsMember |  |
Tax Related to Cellulosic Biofuel Tax Credits |  |  |  |  |  |  |  |
Alternative Energy Tax Credits [Line Items] |  |  |  |  |  |  |  |
(Provision) benefit for income taxes |  |  |  | (102,000,000)us-gaap_IncomeTaxExpenseBenefit / us-gaap_TaxCreditCarryforwardAxis = pkg_TaxRelatedtoCellulosicBiofuelTaxCreditsMember |  |  |  |
Accrued Interest Related to Cellulosic Biofuel Tax Credits |  |  |  |  |  |  |  |
Alternative Energy Tax Credits [Line Items] |  |  |  |  |  |  |  |
(Provision) benefit for income taxes |  |  |  | (1,900,000)us-gaap_IncomeTaxExpenseBenefit / us-gaap_TaxCreditCarryforwardAxis = pkg_AccruedInterestRelatedtoCellulosicBiofuelTaxCreditsMember |  |  |  |
Other Long-Term Liabilities | Alternative Energy Tax Credits |  |  |  |  |  |  |  |
Alternative Energy Tax Credits [Line Items] |  |  |  |  |  |  |  |
Alternative energy tax credits |  |  |  | 13,100,000 pkg_AlternativeFuelMixtureCredits / us-gaap_BalanceSheetLocationAxis = pkg_OtherLongTermLiabilitiesMember / us-gaap_TaxCreditCarryforwardAxis = pkg_AlternativeEnergyTaxCreditsMember |  |  |  |
Deferred Tax Asset | Alternative Energy Tax Credits |  |  |  |  |  |  |  |
Alternative Energy Tax Credits [Line Items] |  |  |  |  |  |  |  |
Alternative energy tax credits |  |  |  | $ 49,000,000 pkg_AlternativeFuelMixtureCredits / us-gaap_BalanceSheetLocationAxis = pkg_DeferredTaxAssetMember / us-gaap_TaxCreditCarryforwardAxis = pkg_AlternativeEnergyTaxCreditsMember |  |  |  |

X
- Definition Represents the net income impact from the alternative energy tax credits. + References No definition available. + Details
Name: | pkg_AlternativeEnergyTaxCredits
Namespace Prefix: | pkg_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Details
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Data Type: | xbrli:stringItemType
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Period Type: | duration

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- Definition The total amount of tax credits earned for the production and use of alternative fuels in an entity's trade or business. + References No definition available. + Details
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Namespace Prefix: | pkg_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Represents expenses incurred related to the alternative energy tax credits. + References No definition available. + Details
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Namespace Prefix: | pkg_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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- Definition Represents the increase or decrease during the period in the reserve for uncertain tax positions. + References No definition available. + Details
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Namespace Prefix: | pkg_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Represents tax credit per gallon of alternative fuel produced. + References No definition available. + Details
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Namespace Prefix: | pkg_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(h)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph h -Article 4 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Income Tax Expense (or Benefit) -URI http://asc.fasb.org/extlink&oid=6515339 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (a),(b) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32639-109319 + Details
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- Details
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- Details
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