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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, 2017	Dec. 31, 2016
Income Tax Disclosure [Abstract]
Expected tax expense	$ 11,643	$ 1,885
Revaluation of deferred tax attributes	(20,204)
State income tax, net of federal benefit	717	194
Percentage depletion	(89)	(84)
IRS settlement		75
Other, net	180	30
Total income tax provision (benefit)	$ (7,753)	$ 2,100

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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 income tax expense (benefit) from continuing operations attributable to an adjustment of a deferred tax liability or asset for enacted changes in tax laws or rates or a change in the tax status of the entity.

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