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U.S. Treasury Grant US Treasury Grant - Additional Information (Details) (USD $) | 12 Months Ended
--- | ---
Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
United States Treasury Grant [Line Items] |  |  |
Treasury grant proceeds | $ 0 | $ 57,399,000 | $ 0
Annual amortization of U.S. treasury grant proceeds | $ 3,200,000 |  |

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
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Namespace Prefix: | pkg_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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

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