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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%

X

- 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

X

- 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

X

- Details

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