Income Taxes - Schedule of Gross Unrecognized Tax Benefits (Detail) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income Tax Disclosure [Abstract]
Balance, January 1 (excluding interest and penalties of $15,901, $15,136 and $15,392, respectively)	$ 77,889	$ 78,674	$ 78,396
Increases in gross unrecognized tax benefits relating to tax positions taken during prior years	11,764	653	1,598
Increases in gross unrecognized tax benefits relating to tax positions taken during current years	22,383	17,961	19,823
Decreases in gross unrecognized tax benefits relating to tax positions taken during prior years	(19)	(699)	(2,961)
Decreases in gross unrecognized tax benefits relating to settlements with tax authorities	(7,251)	(1,218)
Decreases in gross unrecognized tax benefits relating to lapse of the applicable statute of limitations	(17,880)	(17,482)	(18,182)
Balance, December 31 (excluding interest and penalties of $18,376, $15,901 and $15,136, respectively)	$ 86,886	$ 77,889	$ 78,674

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Amount of unrecognized tax benefits.

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-Name Accounting Standards Codification
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Amount of decrease in unrecognized tax benefits resulting from tax positions taken in prior period tax returns.

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Amount of decrease in unrecognized tax benefits resulting from settlements with taxing authorities.

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Amount of increase in unrecognized tax benefits resulting from tax positions that have been or will be taken in current period tax return.

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