Income Taxes - Summary of Rollforward of Beginning and Ending Amount of Unrecognized Tax Benefits, Excluding Interest and Penalties (Detail) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Jun. 30, 2019	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income Tax Disclosure [Abstract]
Balance, beginning of period		$ (55,943)	$ (81,864)	$ (34,970)
Additions for current year tax positions		(85,970)	(2,906)	(51,260)
Additions for prior year tax positions		(2,113)	(20,943)	(2,938)
Reductions for prior year tax positions	$ 14,200	23,267	49,175	623
Reductions related to statute of limitation expirations		1,875	595	6,681
Balance, end of period		$ (118,884)	$ (55,943)	$ (81,864)