Income Taxes - Schedule of Provision for Income Taxes (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Current:
Federal	$ 9,030	$ 10,546	$ 17,345	$ 17,624
State and local	1,470	1,871	2,928	3,160
Foreign	1,498	1,750	3,043	2,885
Total current provision	11,998	14,167	23,316	23,669
Deferred:
Federal	(479)	2,836	1,060	7,813
State and local	(72)	406	94	1,119
Foreign	103	16	224	231
Total deferred provision	(448)	3,258	1,378	9,163
Provision for income taxes	$ 11,550	$ 17,425	$ 24,694	$ 32,832