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Income Taxes - Income from Continuing Operations Before Provision (Benefit) for Income Taxes (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Income Tax Disclosure [Abstract]
Provisions (benefit) for income taxes at federal statutory rate	$ (45,531)	$ (27,512)	$ 3,383
State current and deferred income taxes	(4,452)	(2,184)	639
Energy credit	(888)	(2,846)
Valuation allowance	11,855	918
Other	(2,940)	(896)	229
Provisions (benefit) for income taxes	$ (41,956)	$ (32,520)	$ 4,251

X

- Definition

A credit or adjustment for government or taxing authority authorized decrease in taxes owed as a result of meeting certain tax policy conditions.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
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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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Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to increase (decrease) in the valuation allowance for deferred tax assets.

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The amount of income tax expense or benefit for the period computed by applying the domestic federal statutory tax rates to pretax income from continuing operations.

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