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US Treasury Grant - Additional Information (Details) (USD $) In Millions, unless otherwise specified | 0 Months Ended | 12 Months Ended
--- | --- | ---
Apr. 11, 2012 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Disclosure U S Treasury Grant Additional Information [Abstract] |  |  |  |
Treasury grant proceeds | $ 57.4 pkg_ProceedsFromGovernmentGrant | $ 0 pkg_ProceedsFromGovernmentGrant | $ 0 pkg_ProceedsFromGovernmentGrant | $ 57.4 pkg_ProceedsFromGovernmentGrant
Annual amortization of U.S. treasury grant proceeds |  | $ 3.2 pkg_AmortizationofU.S.TreasuryGrantProceeds |  |

X
- Definition Proceeds from U.S. treasury grant are amortized ratably over the estimated useful lives of the related equipment, each year. + References No definition available. + Details
Name: | pkg_AmortizationofU.S.TreasuryGrantProceeds
Namespace Prefix: | pkg_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Details
Name: | pkg_DisclosureUSTreasuryGrantAdditionalInformationAbstract
Namespace Prefix: | pkg_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents proceeds received from government grant. + References No definition available. + Details
Name: | pkg_ProceedsFromGovernmentGrant
Namespace Prefix: | pkg_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration