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Income Taxes (Detail) (USD $)	3 Months Ended		9 Months Ended
Income Taxes (Detail) (USD $)	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011	Dec. 31, 2011
Income Tax Expense (Benefit)	$ 15,436,000	$ 13,963,000	$ 50,607,000	$ 43,364,000
Effective Income Tax Rate, Continuing Operations	33.00%	31.40%	32.10%	32.10%
Unrecognized Tax Benefits	20,000,000		20,000,000		18,300,000
Unrecognized Tax Benefits Reductions Resulting From Settlements With Taxing Authorities And Lapse Of Applicable Statute Of Limitations			4,800,000
Liability For Uncertain Tax Positions	$ 15,200,000		$ 15,200,000		$ 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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