Summary of Goodwill Activity (Detail) - USD ($)	12 Months Ended
Dec. 31, 2018	Dec. 31, 2017
Goodwill - beginning of year	$ 189,847,202	$ 103,407,351
Goodwill, Acquisitions		86,439,851
Adjustments	(242,456)
Impairment – (MMG)	(3,798,866)
Goodwill - end of year	$ 185,805,880	$ 189,847,202

Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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