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Acquisitions and Dispositions - Summary of Pro forma Information (Detail) - USD ($) | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017
Business Combination Increase Decrease To Reflect Liabilities Acquired At Fair Value [Abstract] |  |
Net revenue | $ 263,483,963 | $ 262,237,250
Operating income | 42,718,429 | 44,592,524
Net income | $ 16,307,717 | $ 11,983,819
Basic and diluted net income per share | $ 0.59 | $ 0.43

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- Definition Amount after tax of pro forma income from continuing operations as if the business combination had been completed at the beginning of a period. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(2) -URI http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(3) -URI http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463 + Details
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