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Share-Based Compensation - Additional Information (Details) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
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

X

- 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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Data Type:	xbrli:normalizedStringItemType
Balance Type:	na
Period Type:	duration

X

- 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

X

- Details

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

X

- 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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Data Type:	xbrli:sharesItemType
Balance Type:	na
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