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Stock Based Compensation - Additional Information (Detail) (USD $) In Millions, except Share data, unless otherwise specified	9 Months Ended
	Sep. 30, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Long-term equity incentive plan, termination date	Oct. 19, 2014
Long-term equity incentive plan, amendment date	May 01, 2013
Long-term equity incentive plan, term	10 years
Number of shares authorized under plan	10,550,000
Share based awards	8,313,735
Number of additional shares authorized for grant	2,000,000
Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period of equity awards granted to employees, years	4 years
Unrecognized compensation cost related to nonvested awards granted under the equity incentive plan	$ 22.9
Expected weighted-average period to recognize the cost of stock awards (in years)	2 years 9 months 18 days
Performance Shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period of equity awards granted to employees, years	4 years
Unrecognized compensation cost related to nonvested awards granted under the equity incentive plan	$ 3.2
Expected weighted-average period to recognize the cost of stock awards (in years)	3 years 9 months 18 days
After Amendment
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Long-term equity incentive plan, termination date	May 01, 2023

X

- Definition

The date when the equity incentive plan was amended, 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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Period Type:	duration

X

- Definition

The number of years the long term equity incentive plan termination date was extended.

+ References

No definition available.

+ Details

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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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X

- Definition

Options, restricted stock and performance units granted since inception of the plan, net of forfeitures.

+ References

No definition available.

+ Details

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Namespace Prefix:	pkg_
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X

- Definition

Unrecognized cost of unvested share-based compensation awards.

+ 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 (i)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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X

- Definition

Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ 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 (i)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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- Definition

Estimated period over which an employee is required to provide service in exchange for the equity-based payment award, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ 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)(1)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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- Definition

Number of additional shares authorized for issuance under an established share-based compensation plan.

+ References

No definition available.

+ Details

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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

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