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Income Taxes - Additional Information (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Income Tax Disclosure [Abstract]
Operating Loss Carryforwards	$ 29,000,000
Unrecognized Tax Benefits	$ 0
Federal statutory rate	35.00%	35.00%	35.00%
Annual effective income tax rate, percentage	47.00%	30.00%	29.00%
Net deferred tax asset	$ 25,509,000	$ 33,315,000
Alternative minimum tax credit carryforward	201,000	0
Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Amount	$ 16,709,000	$ 0	$ 0

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Amount, after allocation of valuation allowances and deferred tax liability, of deferred tax asset attributable to deductible differences and carryforwards, without jurisdictional netting.

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-Topic 740
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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible alternative minimum tax credit carryforwards.

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

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Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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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 income tax rates.

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Amount of unrecognized tax benefits.

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