Income Taxes - Income from Continuing Operations before Income Taxes (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Income Tax Disclosure [Abstract]
Domestic (U.S., state and local)	$ 43,472	$ 38,672	$ 6,971
Foreign	37,095	47,251	49,946
Income before income taxes	$ 80,567	$ 85,923	$ 56,917