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Vessels, Net - Summary of Vessels, Net (Detail) - USD ($)
 6 Months Ended 12 Months Ended
Dec. 31, 2020
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Property, Plant and Equipment [Abstract]        
Vessel cost, Balance   $ 1,087,601,983 $ 1,105,413,815  
Vessel cost, Additions   44,894,678    
Vessel cost, Impairment loss   (14,511,735) (3,250,000)  
Vessel cost, Disposals   (6,500,000) (14,561,832)  
Vessel cost, Balance $ 1,111,484,926 1,111,484,926 1,087,601,983 $ 1,105,413,815
Accumulated Depreciation, Balance   (252,449,580) (220,665,124)  
Accumulated Depreciation, Impairment loss   10,654,428 2,256,084  
Accumulated Depreciation, Disposals   (100,378) (3,653,193)  
Accumulated Depreciation, Depreciation for the year   (37,455,093) (37,693,733)  
Accumulated Depreciation, Balance (279,149,867) (279,149,867) (252,449,580) (220,665,124)
Net Book Value, Balance   835,152,403 884,748,691  
Net Book Value, Additions   44,894,678    
Net Book Value, Impairment loss   (3,857,307) (993,916) (11,351,821)
Net Book Value, Disposals   (6,399,622) (10,908,639)  
Net Book Value, Depreciation for the year (170,884) (37,455,093) (37,693,733) (41,258,142)
Net Book Value, Balance $ 832,335,059 $ 832,335,059 $ 835,152,403 $ 884,748,691