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v3.20.1

Vessels, Net - Additional Information (Detail) | 3 Months Ended | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Mar. 31, 2019 Agreement Vessel | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Sep. 30, 2019 USD ($) | Jul. 31, 2018 USD ($) | Apr. 30, 2018 USD ($) | Mar. 31, 2018 USD ($)
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |
Net (gain)/loss on sale of vessels |  | $ 485,516 | $ 763,925 | $ 77,314 |  |  |  |
Disposal group, including discontinued operation |  | 0 |  | $ 0 |  |  |  |
34 Vessels [Member] |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |
Debt instrument, collateral amount |  | 787,185,762 |  |  |  |  |  |
40 Vessels [Member] |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |
Debt instrument, collateral amount |  |  | 891,758,621 |  |  |  |  |
Six Vessels [Member] |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |
Disposal group, including discontinued operation |  |  | 718,448 |  |  |  |  |
Impairment Loss [Member] |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |
Impairment of long-lived assets held-for-use |  | 993,916 |  |  |  |  |  |
Gas Enchanted [Member] |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |
Disposal group, including discontinued operation, consideration |  |  |  |  |  |  | $ 8,950,000 |
Impairment of long-lived assets held-for-use |  |  | 1,937,822 |  |  |  |  |
Gas Legacy [Member] |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |
Disposal group, including discontinued operation, consideration |  |  |  |  |  |  |  | $ 4,990,000
Impairment of long-lived assets held-for-use |  |  | 1,418,672 |  |  |  |  |
Gas Evoluzione [Member] |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |
Disposal group, including discontinued operation, consideration |  |  |  |  |  |  | $ 3,575,000 |
Impairment of long-lived assets held-for-use |  |  | 604,774 |  |  |  |  |
Gas Sikousis [Member] |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |
Disposal group, including discontinued operation, consideration |  |  |  |  |  | $ 9,450,000 |  |
Impairment of long-lived assets held-for-use |  |  | 842,332 |  |  |  |  |
Gas Marathon, Gas Sincerity and Gas Texiana [Member] |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |
Disposal group, including discontinued operation, consideration |  |  |  |  |  | $ 12,700,000 |  |
Impairment of long-lived assets held-for-use |  |  | 3,358,363 |  |  |  |  |
Gas Defiance, Gas Shuriken, Gas Haralambos and Eco Lucidity [Member] |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |
Impairment of long-lived assets held-for-use |  |  | $ 3,189,858 |  |  |  |  |
Number of joint venture agreements | Agreement | 4 |  |  |  |  |  |  |
Interest acquired on joint venture agreements | 49.90% |  |  |  |  |  |  |
Number of vessel owning companies | Vessel | 4 |  |  |  |  |  |  |
Gas Ethereal [Member] |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |
Disposal group, including discontinued operation, consideration |  |  |  |  | $ 10,900,000 |  |  |
Gas Sincerity Gas Texiana [Member] |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |
Net (gain)/loss on sale of vessels |  | $ 485,516 |  |  |  |  |  |

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