Income Taxes - Additional Information (Detail) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Income Tax Disclosure [Abstract]
Operating loss carryforwards	$ 213,504
Operating loss carryforwards, not subject to expiration	156,144
Operating loss carryforwards, subject to expiration	57,360
Unrecognized tax benefits including interest and penalties	25,870	$ 24,347
Unrecognized tax benefits that would impact effective tax rate	21,426	$ 18,286
Undistributed earnings of foreign subsidiaries	$ 520,000