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Income Taxes - Components of Current and Deferred Income Tax Expense (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Current:
Federal	$ 15,805	$ 19,007	$ 14,515
State and local	3,202	2,708	1,425
Foreign	1,482	440	567
Total current	20,489	22,155	16,507
Deferred:
Federal	(5,318)	7,947	10,629
State and local	(1,077)	1,105	2,296
Foreign	312	(214)	(25)
Total deferred	(6,083)	8,838	12,900
Income tax expense	$ 14,406	$ 30,993	$ 29,407

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