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Long-Term Debt - Summary of Long-Term Debt (Detail) - USD ($)
Dec. 31, 2017
Dec. 31, 2016
Line of Credit Facility [Line Items]    
Capital lease obligations $ 630,874 $ 691,951
Long-term debt, including capital lease obligations 225,630,874 268,691,951
Less unamortized debt issuance costs (10,850,972) (14,313,703)
Long-term debt 214,779,902 254,378,248
Long-term debt 214,779,902 254,378,248
Less current installments (2,314,020) (6,686,077)
Long-term debt, net of current portion 212,465,882 247,692,171
Term Loan [Member]    
Line of Credit Facility [Line Items]    
Long-term debt $ 225,000,000 265,000,000
Revolving Credit Loan [Member]    
Line of Credit Facility [Line Items]    
Revolving credit facility   $ 3,000,000