Income Taxes - Provision (Benefit) for Income Taxes (Detail) - USD ($) $ in Thousands	3 Months Ended								6 Months Ended		9 Months Ended		12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Jun. 30, 2019	Jun. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income Tax Disclosure [Abstract]
Current provision (benefit), federal													$ (205)	$ (3,432)	$ 2,954
Deferred provision (benefit), federal													(336)	4,426	7,446
Total provision (benefit), federal													(541)	994	10,400
Current provision (benefit), state and local													214	123	362
Deferred provision (benefit), state and local													883	87	(384)
Total provision (benefit), state and local													1,097	210	(22)
Current provision (benefit), foreign													4,207	6,365	4,042
Deferred provision (benefit), foreign													1,015	518	647
Total provision (benefit), foreign													5,222	6,883	4,689
Current provision (benefit)													4,216	3,056	7,358
Deferred provision (benefit)													1,562	5,031	7,709
Provision for income taxes	$ (135)	$ 496	$ 2,230	$ 3,187	$ 368	$ (175)	$ 4,344	$ 3,550	$ 5,417	$ 7,894	$ 5,913	$ 7,719	$ 5,778	$ 8,087	$ 15,067