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Long-Term Debt - Scheduled Repayments of Credit Facility and Capital Lease Obligations (Detail) - USD ($)
Dec. 31, 2018
Dec. 31, 2017
Debt Disclosure [Abstract]    
2019 $ 67,101  
2020 70,326  
2021 2,247,730  
2022 2,614,572  
2023 247,216,701  
Thereafter 350,424  
Total $ 252,566,854 $ 225,630,874