Income Taxes - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Income Tax Disclosure [Line Items]
Provision for income taxes	$ 3,451	$ 13,029
Effective tax rate for income tax expense (as a percent)	27.80%	30.70%
U.S. federal statutory rate (as a percent)	21.00%
Valuation allowance amount	$ 31,420
Liability for uncertain tax positions noncurrent	2,787
U.S.
Income Tax Disclosure [Line Items]
Valuation allowance amount	1,413
Foreign
Income Tax Disclosure [Line Items]
Valuation allowance amount	$ 30,007