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Income Taxes - Narrative (Detail) - USD ($)	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018
Income Tax Contingency [Line Items]
Income tax expense	$ 5,862,733	$ 3,702,100
Effective tax rate	23.10%	22.20%
Federal statutory income tax rate, percent	21.00%	21.00%
Valuation allowance	$ 0		$ 0
Interest and penalties	$ 0
Parent Company
Income Tax Contingency [Line Items]
Effective tax rate	25.70%

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

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