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Alternative Energy Tax Credits (Details) (USD $)	3 Months Ended			9 Months Ended		3 Months Ended		9 Months Ended
	Mar. 31, 2010	Sep. 30, 2011	Dec. 31, 2010	Sep. 30, 2011 Alternative Fuel Mixture Credits [Member]	Dec. 31, 2009 Alternative Fuel Mixture Credits [Member]	Dec. 31, 2010 Cellulosic Biofuel Tax Credits [Member]	Sep. 30, 2010 Cellulosic Biofuel Tax Credits [Member]	Sep. 30, 2011 Cellulosic Biofuel Tax Credits [Member]	Jun. 30, 2010 Cellulosic Biofuel Tax Credits [Member]
Refundable tax credit per gallon					$ 0.50				$ 1.01
Alternative fuel mixture tax credit reserve	9,200,000
Alternative fuels produced claimed for alternative energy tax credits				33.00%				66.00%
Cellulosic biofuel producer credits before reserves for uncertain tax positions						107,000,000
Net income impact from the alternative energy tax credits						5,000,000	33,400,000
Uncertain tax positions			102,000,000
Tax credits used to offset future cash tax payment		$ 175,000,000

X

- Definition

Represents the net income impact from the alternative energy tax credits.

+ Details

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X

- Definition

Represents the cellulosic biofuel producer credits before any reserves for uncertain tax positions.

+ Details

Name:	pkg_AlternativeEnergyTaxCreditsBeforeReservesForUncertainTaxPositions
Namespace Prefix:	pkg
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Period Type:	duration

X

- Definition

Represents the increase or decrease during the period in the reserve for uncertain tax positions.

+ Details

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X

- Definition

Percentage of Alternative Fuel Produced, Claimed for Tax Credit

+ Details

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Namespace Prefix:	pkg
Data Type:	us-types:percentItemType
Balance Type:	na
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X

- Definition

Reserve Recorded Due to Ambiguity of Calculation of Credit

+ Details

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Namespace Prefix:	pkg
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
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X

- Definition

Tax Credit Per Gallon

+ Details

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X

- Definition

The amount of the tax credit carryforward, before tax effects, available to reduce future taxable income under enacted tax laws.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 109

-Paragraph 48



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 109

-Paragraph 17

-Subparagraph a

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