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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, 2015	Dec. 31, 2014	Dec. 31, 2013
Income Tax Disclosure [Abstract]
Provisions (benefit) for income taxes at federal statutory rate	$ (20,391)	$ 11,263	$ 31,697
State current and deferred income taxes	(1,317)	1,497	3,916
Gross tax credits	(2,846)	(110)	(318)
Valuation allowance	950
Other	54	(250)	126
Provisions (benefit) for income taxes	$ (23,550)	$ 12,400	$ 35,421

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- Definition

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

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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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