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Income Taxes (Detail) (USD $)	3 Months Ended		9 Months Ended
Income Taxes (Detail) (USD $)	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Dec. 31, 2012
Income Tax Disclosure [Abstract]
Provision for income taxes	$ 18,430,000	$ 15,436,000	$ 58,584,000	$ 50,607,000
Effective income tax rate	32.50%	33.00%	32.60%	32.10%
Unrecognized tax benefits	18,500,000		18,500,000		17,600,000
Unrecognized tax benefits reductions resulting from settlements with taxing authorities and lapse of applicable statute of limitations			5,700,000
Liability for uncertain tax positions	$ 12,800,000		$ 12,800,000		$ 13,100,000

- 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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