Income Taxes - Provision (Benefit) for Income Tax for Continuing Operations (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Current:
Federal	$ 35,715	$ 2,659	$ 56
State and local	10,796	5,386	5,350
Foreign	3,343	9,733	7,214
Current income tax provision (benefit) for continuing operations, Total	49,854	17,778	12,620
Deferred:
Federal	(5,919)	1,356	18,293
State and local	1,300	(4,027)	3,266
Foreign	1,764	(3,752)	(684)
Deferred income tax provision (benefit) for continuing operations, Total	(2,855)	(6,423)	20,875
Income tax provision	$ 46,999	$ 11,355	$ 33,495