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Tax Years Subject to Examination by Major Taxing Jurisdictions (Detail)	12 Months Ended
	Dec. 31, 2011
United States
Income Tax Examination [Line Items]
Years	2008 - 2011
Canada
Income Tax Examination [Line Items]
Years	2008 - 2011
Arkansas State
Income Tax Examination [Line Items]
Years	2008 - 2011
California State
Income Tax Examination [Line Items]
Years	2007 - 2011
Georgia State
Income Tax Examination [Line Items]
Years	2008 - 2011
Idaho State
Income Tax Examination [Line Items]
Years	2008 - 2011
Illinois State
Income Tax Examination [Line Items]
Years	2008 - 2011
Wisconsin State
Income Tax Examination [Line Items]
Years	2007 - 2011

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- Definition

The tax year(s) being audited in connection with the income tax examination.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 740

-SubTopic 10

-Section 50

-Paragraph 15

-Subparagraph (d)(2)

-URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32718-109319

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