Income Taxes - Schedule of Gross Unrecognized Tax Benefits (Excluding Interest and Penalties) (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Income Tax Disclosure [Abstract]
Beginning Balance	$ 21,351	$ 23,676
Additions for current year tax positions	309	170
Increases for prior year tax positions	1,711	1,653
Settlements of prior year tax positions	(1,183)	(1,499)
Expiration of statutes	(5,284)	(2,649)
Ending Balance	$ 16,904	$ 21,351