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Income Taxes - Schedule of Activity Related to 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 at beginning of year	$ 11,185	$ 10,972	$ 9,469
Increases related to prior year tax positions	369	385	2,284
Decreases related to prior year tax positions			(143)
Increases related to current year tax positions	1,700	2,900	1,430
Decreases related to lapse of statutes of limitation	(5,845)	(3,072)	(2,068)
Balance at end of year	$ 7,409	$ 11,185	$ 10,972

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Amount of unrecognized tax benefits.

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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 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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