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Income Taxes - Schedule of Income Tax Expense (Benefit), Federal Statutory Rate (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Income Tax Disclosure [Abstract]
Expected tax expense	$ 13,616,008	$ 19,525,175
State income taxes, net of federal benefit	1,150,258	552,499
Gain on merger	(3,518,814)	(15,941,611)
Tax rate adjustments	(59,717,125)	2,915,844
Change in valuation allowance	52,833	(65,900)
Non-deductible items	(110,953)	1,147,565
Other	299,503	164,230
Income Tax Expense (Benefit)	$ (48,228,290)	$ 8,297,802

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Income tax reconciliation gain (loss) on merger.

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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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