Schedule of Unrecognized Tax Benefits (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income Tax Disclosure [Line Items]
Beginning balance, as of January 1	$ 43,395	$ 36,263	$ 38,958
Tax positions for current year, Additions	1,322	4,716	8,208
Tax positions for prior years, Additions	8,043	2,626	199
Tax positions for prior years, Reductions	(31,397)	(153)	(10,573)
Expiration of statutes, Reductions	(183)	(57)	(325)
Settlements with tax authorities, Reductions			(204)
Ending balance as of December 31	$ 21,180	$ 43,395	$ 36,263