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Long-Term Debt - Summary of Long-Term Debt (Detail) - USD ($)
Sep. 30, 2018
Dec. 31, 2017
Line of Credit Facility [Line Items]    
Capital lease obligations $ 582,859 $ 630,874
Long-term debt, including capital lease obligations 253,582,859 225,630,874
Less unamortized debt issuance costs (9,707,463) (10,850,972)
Long-term debt 243,875,396 214,779,902
Long-term debt 243,875,396 214,779,902
Less current installments (66,331) (2,314,020)
Long-term debt, net of current portion 243,809,065 212,465,882
Term Loan [Member]    
Line of Credit Facility [Line Items]    
Long-term debt 253,000,000 225,000,000
Revolving Credit Loan [Member]    
Line of Credit Facility [Line Items]    
Revolving credit facility $ 0 $ 0