Income Taxes - Sources of Income before Income Taxes (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Income Tax Disclosure [Abstract]
United States	$ 11,346	$ 53,461	$ 47,191
Foreign	(42,744)	15,828	23,301
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest	$ (31,398)	$ 69,289	$ 70,492