Income Tax Provision (Benefit) for Federal, and State and Local Income Taxes (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Current:
Current income tax expense, Federal	$ (6,509)	$ (1,012)
Current income tax expense, State and local	21	(10)
Current income tax expense, Foreign	3,552	6,785
Total current	(2,936)	5,763
Deferred:
Deferred income tax expense, Federal	(185)	23
Deferred income tax expense, State and local	402	(103)
Deferred income tax expense, Foreign	514
Total deferred	731	(80)
Total provision (benefit)	$ (2,205)	$ 5,683