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Schedule of Unrecognized Tax Benefits (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Tax Disclosure [Line Items]
Beginning balance, as of January 1	$ 36,263	$ 38,958	$ 36,792
Tax positions for current year, Additions	4,716	8,208	9,766
Tax positions for prior years, Additions	2,626	199	187
Tax positions for prior years, Reductions	(153)	(10,573)	(1,960)
Expiration of statutes, Reductions	(57)	(325)	(3,532)
Settlements with tax authorities, Reductions		(204)	(2,295)
Ending balance as of December 31	$ 43,395	$ 36,263	$ 38,958

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Income Tax Disclosure [Line Items]

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