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Debt Additional Information on Variable Rate Debt (Details) | Dec. 31, 2013 Five-Year Term Loan, due October 2018 | Oct. 18, 2013 Five-Year Term Loan, due October 2018 | Dec. 31, 2013 Seven-Year Term Loan, due October 2020 | Oct. 18, 2013 Seven-Year Term Loan, due October 2020 | Dec. 31, 2012 Receivables Credit Facility | Dec. 31, 2012 Senior Credit Facility, Term Loan, due October 2016
--- | --- | --- | --- | --- | --- | ---
Debt Instrument [Line Items] |  |  |  |  |  |
Reference Interest Rate | 0.17% |  | 0.17% |  | 0.21% | 0.21%
Applicable margin | 1.375% | 1.375% | 1.625% | 1.625% | 0.85% | 1.50%

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- Definition Represents the applicable margin for the debt instrument at the end of the period. + References No definition available. + Details
Name: | pkg_LongTermDebtApplicableMargin
Namespace Prefix: | pkg_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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- Definition Represents the reference interest rate for the debt instrument at the end of the period. + References No definition available. + Details
Name: | pkg_ReferenceInterestRate
Namespace Prefix: | pkg_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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- Details
Name: | us-gaap_DebtInstrumentLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration