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Long-Term Debt - Scheduled Repayments of Credit Facility and Capital Lease Obligations (Detail) - USD ($)
Dec. 31, 2017
Dec. 31, 2016
Debt Disclosure [Abstract]    
2018 $ 2,314,020  
2019 2,317,101  
2020 2,320,326  
2021 2,323,700  
2022 2,253,332  
Thereafter 214,102,395  
Total $ 225,630,874 $ 268,691,951