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Income Taxes - Narrative (Detail) - USD ($)			12 Months Ended
	Dec. 22, 2017	Dec. 21, 2017	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Income Taxes [Line Items]
Federal income tax at statutory rate	21.00%	35.00%	35.00%	35.00%	35.00%
Percentage of tax position will realized or sustained upon examination			50.00%
Valuation allowance on deferred tax assets			$ 0	$ 0
Unrecognized tax benefits			$ 0	$ 0
Deferred tax asset, provisional income tax expense	$ 5,500,000
Minimum
Income Taxes [Line Items]
Percentage of tax position will realized or sustained upon examination			50.00%
Federal
Income Taxes [Line Items]
Net operating loss carryovers			$ 6,000,000

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Income Taxes [Line Items]

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Tax Cuts And Jobs Act Of 2017, Incomplete Accounting, Change In Tax Rate, Deferred Tax Asset, Provisional Income Tax Expense

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Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized.

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

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Amount of unrecognized tax benefits.

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