Income Taxes - Schedule of Additional Information Relating to Unrecognized Tax Benefits (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income Tax Disclosure [Abstract]
Unrecognized tax benefits at the end of the year that, if recognized, would favorably affect the effective tax rate (includes interest and penalties of $18,376, $15,901 and $15,136, respectively)	$ 85,603	$ 78,693	$ 78,841
Unrecognized tax benefits that, if recognized, would not affect the effective tax rate	19,659	15,097	14,969
Interest and penalties recognized in current income tax expense (after giving effect to the reversal of interest and penalties of $3,455, $4,889 and $6,185, respectively)	$ 2,475	$ 765	$ (256)