Income Taxes - Schedule of Provision for Income Taxes (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Current:
Federal	$ 7,970	$ 8,315
State and local	1,919	1,458
Foreign	1,114	1,546
Total current provision	11,003	11,319
Deferred:
Federal	846	1,539
State and local	130	166
Foreign	1,094	120
Total deferred provision	2,070	1,825
Provision for income taxes	$ 13,073	$ 13,144