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Long-Term Debt - Summary of Long-Term Debt (Detail) - USD ($)
Dec. 31, 2016
Dec. 31, 2015
Line of Credit Facility [Line Items]    
Capital lease obligations $ 691,951 $ 750,216
Long-term debt, including capital lease obligations 268,691,951 89,750,216
Less unamortized debt issuance costs (14,313,703) (1,804,390)
Long-term debt 254,378,248 87,945,826
Long-term debt 254,378,248 87,945,826
Less current installments (6,686,077) (1,484,048)
Long-term debt, net of current portion 247,692,171 86,461,778
Term Loan [Member]    
Line of Credit Facility [Line Items]    
Long-term debt 265,000,000 $ 89,000,000
Revolving Credit Loan [Member]    
Line of Credit Facility [Line Items]    
Revolving credit facility $ 3,000,000