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Income Taxes - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	6 Months Ended
	Jun. 30, 2012
Income Taxes [Line Items]
Reduction in deferred tax liabilities due to statutory tax rates in Canada being lower than those in the United States	$ (5.1)
Deferred tax liabilities that have not been provided on such unremitted foreign earnings for United States Federal or state income taxes	$ 23.5

X

- Definition

Deferred Tax Liabilities, Increase (Decrease)

+ References

No definition available.

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X

- Definition

The amount of the deferred tax liability which was not recognized because of the exceptions to comprehensive recognition of deferred taxes.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

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-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.



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