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US Treasury Grant - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified | 1 Months Ended | 12 Months Ended
--- | --- | ---
Apr. 30, 2012 | Dec. 31, 2012
United States Treasury Grant [Line Items] |  |
Treasury grant proceeds | $ 57,399 | $ 57,399

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