Income Taxes - Significant Components of the Provision (Benefit) for Income Taxes (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Current:
Federal	$ 4,900	$ 6,039	$ 16,346
State	1,377	1,263	1,534
Foreign	228	656	1,050
Total current	6,505	7,958	18,930
Deferred:
Federal	(8,382)	4,539	(4,145)
State	(364)	(1,631)	(977)
Foreign	(3)	(78)	(45)
Total deferred	(8,749)	2,830	(5,167)
Tax impact of unrecorded tax benefits liability	1,143	(234)	437
Provision for income taxes	$ (1,101)	$ 10,554	$ 14,200