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Share-based Compensation - Additional Information (Details) In Millions, unless otherwise specified | 3 Months Ended
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Mar. 31, 2014
Share-based Compensation [Abstract] |
Long-term equity incentive plan, termination date | May 1, 2023
Number of shares authorized under plan | 10.6
Number of shares available for future issuance under share-based plan | 2.1

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- Definition The date when the equity incentive plan expires, which may be presented in a variety of ways (for example, year, month and year, day, month and year, quarter of a year). + References No definition available. + Details
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Namespace Prefix: | pkg_
Data Type: | xbrli:normalizedStringItemType
Balance Type: | na
Period Type: | duration

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- Definition Number of Shares available for future issuance under share-based payment plan + References No definition available. + Details
Name: | pkg_NumberOfSharesAvailableForFutureIssuanceUnderShareBasedPaymentPlan
Namespace Prefix: | pkg_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

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- Details
Name: | us-gaap_ShareBasedCompensationAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant