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Income Taxes - Income Tax Expense Benefit Income Tax Reconciliation (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Income Tax Disclosure [Abstract]
Tax benefit at statutory rate	$ (44,788)	$ (420,544)	$ (28,630)
Tax effect of:
Nondeductible compensation	73	539	756
State taxes, net of federal tax benefit	(18,860)	(18,218)	(8,121)
Valuation allowance on deferred tax assets	69,890	283,585	11,099
Other	854	193	207
Total	$ 7,169	$ (154,445)	$ (24,689)

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Income tax reconciliation nondeductible expenses deductible expenses and other expenses.

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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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