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Income Taxes - Components of Income Tax Expense (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income Tax Disclosure [Abstract]
Federal - Current	$ (43)	$ (70)	$ (420)
State - Current	27	93	0
Total current income tax expense	(16)	23	(420)
Federal - Deferred	(28,148)	(3,553)	(199,370)
State - Deferred	(4,551)	(2,313)	(3,514)
Total deferred income tax expense	(32,699)	(5,866)	(202,884)
Annual effective tax benefit	$ (32,715)	$ (5,843)	$ (203,304)

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