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v3.19.1

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 |  |

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