Income Taxes - Reconciliations of Total Amount of Gross Unrecognized Tax Benefits (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Income Tax Disclosure [Abstract]
Gross unrecognized tax benefits at beginning of year	$ 12,295	$ 12,561
Increase in tax positions for prior years	1,786	61
Increase in tax positions from prior years	(54)	(234)
Increases in tax positions for current year	3,414	2,970
Increases in tax positions for current year	(421)	(2,577)
Lapse in statute of limitations	(826)	(486)
Gross unrecognized tax benefits at end of year	$ 16,194	$ 12,295