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Long-Term Debt - Scheduled Repayments of Credit Facility and Capital Lease Obligations (Detail) - USD ($)
Jun. 30, 2018
Dec. 31, 2017
Debt Disclosure [Abstract]    
2018 $ 32,010  
2019 67,101  
2020 1,820,326  
2021 2,323,700  
2022 2,253,332  
Thereafter 214,102,395  
Total $ 220,598,864 $ 225,630,874