Income Taxes - Schedule of Components of Provision for Income Taxes (Detail) - USD ($) $ in Thousands	3 Months Ended									12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Current
Federal										$ 5,451	$ 4,304	$ 348
Foreign										3,019	3,383	2,068
State and local										1,029	396	26
Total current expense										9,499	8,083	2,442
Deferred expense
Federal										2,333	1,741	366
Foreign										25	(5)	9
State and local										173	129	27
Total deferred expense										2,531	1,865	402
Provision for income tax expense	$ 3,148	$ 3,277	$ 3,457	$ 2,148	$ 1,818	$ 3,116	$ 3,129	$ 1,885	$ 1,071	$ 12,030	$ 9,948	$ 2,844