Income Taxes - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Income Tax Disclosure [Line Items]
Income tax expense	$ 31,924	$ 23,757	$ 67,250	$ 86,509
Effective tax rate for income tax expense (as a percent)	33.80%	32.00%	32.80%	32.40%
U.S. federal statutory rate (as a percent)			35.00%
Excess tax benefits	$ 85		$ 2,024
Valuation allowance amount	20,847		20,847
Liability for uncertain tax positions noncurrent	2,266		2,266
U.S.
Income Tax Disclosure [Line Items]
Valuation allowance amount	2,350		2,350
Foreign
Income Tax Disclosure [Line Items]
Valuation allowance amount	$ 18,497		$ 18,497