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Income Taxes - Provision for Income Taxes Varies from Federal Statutory Tax Rate (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Income Tax Disclosure [Abstract]
Expected tax expense	$ 3,676	$ 11,643
Revaluation of deferred tax attributes	0	(20,204)
Executive Compensation	553	0
State income tax, net of federal benefit	79	717
Percentage depletion	(140)	(89)
Marginal Well Production Credits	(1,186)	0
Other, net	(4)	180
Total income tax provision (benefit)	$ 2,978	$ (7,753)

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Amount of difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying domestic federal statutory income tax rate to pretax income (loss) from continuing operation, attributable to based marginal well production credits cost.

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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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