Income Taxes - Schedule of Changes in Balance of Gross Unrecognized Tax Benefits (Parenthetical) (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021		Mar. 31, 2020
Income Tax Disclosure [Abstract]
Reduction in unrecognized tax benefits	$ 5,171	[1]	$ 5,981

[1] Recorded as an income tax benefit of $5,171 during the three months ended March 31, 2021, along with an equal and offsetting amount recorded in other losses, net, to recognize a reduction in the indemnification asset. During the three months ended March 31, 2020, an income tax benefit of $5,981 was recorded along with an equal and offsetting amount in other losses, net.