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Long-Term Debt - Summary of Long-Term Debt (Detail) - USD ($)
Jun. 30, 2018
Dec. 31, 2017
Line of Credit Facility [Line Items]    
Capital lease obligations $ 598,864 $ 630,874
Long-term debt, including capital lease obligations 220,598,864 225,630,874
Less unamortized debt issuance costs (9,910,220) (10,850,972)
Long-term debt 210,688,644 214,779,902
Long-term debt 210,688,644 214,779,902
Less current installments (65,561) (2,314,020)
Long-term debt, net of current portion 210,623,083 212,465,882
Term Loan [Member]    
Line of Credit Facility [Line Items]    
Long-term debt 220,000,000 225,000,000
Revolving Credit Loan [Member]    
Line of Credit Facility [Line Items]    
Revolving credit facility $ 0 $ 0