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Income Taxes - Components of Income Tax Expense (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Tax Disclosure [Abstract]
Federal - Current	$ (70)	$ (420)	$ 0
State - Current	93	0	0
Total current income tax expense	23	(420)	0
Federal - Deferred	(3,553)	(199,370)	(117,781)
State - Deferred	(2,313)	(3,514)	(10,757)
Total deferred income tax expense	(5,866)	(202,884)	(128,538)
Annual effective tax benefit	$ (5,843)	$ (203,304)	$ (128,538)

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