Income Taxes - Expense (Benefit) for Income Taxes (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Current tax provision:
Federal	$ 1,665	$ 1,022	$ 736
State	1,467	1,403	1,880
Foreign	5,385	9,933	6,577
Current tax provision (benefit)	8,517	12,358	9,193
Deferred Income Tax Expense (Benefit), Continuing Operations [Abstract]
Federal	8,579	10,185	14,844
State	5,166	335	1,086
Foreign	(22,806)	(6,338)	895
Deferred tax expense (benefit)	(9,061)	4,182	16,825
Income tax (benefit) provision	$ (544)	$ 16,540	$ 26,018