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Income Taxes - Narrative (Detail) - USD ($)				12 Months Ended
	Jan. 01, 2018	Dec. 22, 2017	Dec. 21, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Taxes [Line Items]
Federal income tax at statutory rate	21.00%		35.00%	21.00%	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
Annual deduction for compensation paid, maximum				$ 1,000,000
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				$ 5,200,000

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