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Income Taxes - Additional Information (Detail) (USD $)	3 Months Ended
Income Taxes - Additional Information (Detail) (USD $)	Mar. 31, 2012	Mar. 31, 2011	Dec. 31, 2011
Income Taxes [Line Items]
Provision for income taxes	$ 16,162,000	$ 13,424,000
Effective tax rate	32.10%	31.50%
Gross unrecognized tax benefits	19,000,000		18,300,000
Decrease in gross unrecognized tax benefits due to settlements of outstanding audits and the expiration of the statutes of limitation	3,200,000
Long term uncertain tax positions	$ 15,800,000		$ 15,400,000

- Definition

A ratio calculated by dividing the reported amount of income tax expense attributable to continuing operations for the period by GAAP-basis pretax income from continuing operations.

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- Definition

The sum of the current income tax expense or benefit and the deferred income tax expense or benefit pertaining to continuing operations.

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