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Income Taxes - Income Tax Provision (Benefit) (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Income Tax Disclosure [Abstract]
Current - Federal	$ 0	$ 0	$ 0
Current - State	64	804	(12)
Deferred - Federal		(149,171)	(27,652)
Deferred - State	7,105	(6,078)	2,975
Total	$ 7,169	$ (154,445)	$ (24,689)

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