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Income Taxes - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	1 Months Ended
	Jan. 01, 2010	Mar. 31, 2013
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		33.7
Unrecognized deferred tax liability associated with undistributed foreign earnings		$ 5.1

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Unrecognized Deferred Tax Liability Associated With Indefinitely Reinvested Undistributed Earnings

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

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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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The portion of the difference between total income tax expense or benefit as reported in the Income Statement and the expected income tax expense or benefit computed by applying the domestic federal statutory income tax rates to pretax income from continuing operations attributable to the repatriation of foreign earnings in the period.

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