Income Taxes - Components of Provision for Income Tax (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Current income tax expense (benefit):
U.S. federal	$ 214	$ 7,153	$ (11,633)
International	45,185	38,493	27,494
State and local	14,215	14,443	12,286
Total current income tax expense	59,614	60,089	28,147
Deferred income tax expense (benefit):
U.S. federal	2,533	(3,306)	(810)
International	(7,538)	(2,219)	(4,247)
Total deferred income tax benefit	(5,005)	(5,525)	(5,057)
Total income tax expense	$ 54,609	$ 54,564	$ 23,090