Income Taxes - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Income Tax Disclosure [Line Items]
Income tax expense	$ 22,298	$ 34,654	$ 35,325	$ 62,752
Effective tax rate for income tax expense (as a percent)	32.70%	32.70%	32.00%	32.50%
U.S. federal statutory rate (as a percent)			35.00%
Excess tax benefits	$ 30		$ 1,939
Valuation allowance amount	20,867		20,867
Liability for uncertain tax positions noncurrent	2,590		2,590
U.S.
Income Tax Disclosure [Line Items]
Valuation allowance amount	2,350		2,350
Foreign
Income Tax Disclosure [Line Items]
Valuation allowance amount	$ 18,517		$ 18,517