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Income Taxes - Summary of (Benefit) Provision for Income Taxes (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Current
U.S. Federal	$ (2)	$ (14)	$ (637)
U.S. State	309	868	198
Foreign	1,879	1,796	1,749
Total	2,186	2,650	1,310
Deferred
U.S. Federal	563,658	170,508	(483,681)
U.S. State	(1,095)	3,682	(14,973)
Foreign	(78)	0	0
Total	562,485	174,190	(498,654)
Income tax benefit (provision), total	$ 564,671	$ 176,840	$ (497,344)

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