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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