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Income Taxes - Additional Information (Detail) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Income Tax Disclosure [Line Items]
Provision for income taxes	$ 25,828,000	$ 23,533,000	$ 49,962,000	$ 45,386,000
Effective tax rate	29.20%	30.20%	28.70%	29.90%
Reasonably possible change in unrecognized tax benefits over next 12 months, lower range	0		0
Reasonably possible change in unrecognized tax benefits over next 12 months, upper range	$ 2,400,000		$ 2,400,000

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Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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The estimated lower bound of the reasonably possible change in the total amount of the unrecognized tax benefit (that will significantly increase or decrease within twelve months of the balance sheet date) for a tax position taken.

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