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Vessels, Net - Summary of Vessels, Net (Detail) - USD ($)
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2018
Dec. 31, 2017
Property, Plant and Equipment [Abstract]          
Vessel cost, Balance $ 1,090,135,869 $ 1,075,613,321      
Vessel cost, Acquisitions (transfer from Advances for Vessels under Construction and Acquisitions) 169,331,460 55,302,364      
Vessel cost, Disposal (29,846,712) (11,557,252)      
Vessel cost, Vessels held for sale       $ (64,188,000)  
Vessel cost, Impairment loss (60,018,802) (29,222,564)      
Vessel cost, Depreciation for the year (228,073,963) (211,913,582) $ (211,913,582) (220,665,124) $ (228,073,963)
Vessel cost, Balance 1,105,413,815 1,090,135,869 1,075,613,321    
Accumulated Depreciation, Balance (228,073,963) (211,913,582)      
Accumulated Depreciation, Acquisitions (transfer from Advances for Vessels under Construction and Acquisitions) 0 0      
Accumulated Depreciation, Disposal 0 0      
Accumulated Depreciation, Vessels held for sale       0  
Accumulated Depreciation, Impairment loss 48,666,981 22,761,291      
Accumulated Depreciation, Depreciation for the year (41,258,142) (38,921,672) (39,096,589)    
Accumulated Depreciation, Balance (220,665,124) (228,073,963) (211,913,582)    
Net Book Value, Balance 862,061,906 863,699,739      
Net Book Value, Acquisitions (transfer from Advances for Vessels under Construction and Acquisitions) 169,331,460 55,302,364      
Net Book Value, Disposal (29,846,712) (11,557,252)      
Net Book Value, Vessels held for sale       (64,188,000)  
Net Book Value, Impairment loss (11,351,821) (6,461,273) (5,735,086)    
Net Book Value, Depreciation for the year       $ (41,258,142) $ (38,921,672)
Net Book Value, Balance $ 884,748,691 $ 862,061,906 $ 863,699,739