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Vessels, Net - Additional Information (Detail) | 3 Months Ended | 12 Months Ended |  |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Mar. 31, 2019 Vessel Agreement | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Jul. 31, 2018 USD ($) | Apr. 30, 2018 USD ($) | Mar. 31, 2018 USD ($) | Sep. 30, 2017 USD ($) | Aug. 31, 2017 USD ($) | May 31, 2017 USD ($) | Apr. 30, 2017 USD ($)
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |
Impairment of long-lived assets to be disposed of |  | $ 11,351,821 | $ 4,305,271 |  |  |  |  |  |  |  |
Impairment of long-lived assets held-for-use |  |  | 2,156,002 |  |  |  |  |  |  |  |
Net (gain)/loss on sale of vessels |  | 763,925 | 77,314 | $ (118,427) |  |  |  |  |  |  |
Disposal group, including discontinued operation |  | 0 | 0 |  |  |  |  |  |  |  |
40 Vessels [Member] |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt instrument, collateral amount |  | 891,758,621 | 762,159,589 |  |  |  |  |  |  |  |
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 |  |  | 2,156,002 |  |  |  |  |  |  |  |
Gas Icon [Member] |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |
Impairment of long-lived assets to be disposed of |  |  | 1,747,923 |  |  |  |  |  |  |  |
Disposal group, including discontinued operation, consideration |  |  |  |  |  |  |  |  |  |  | $ 2,900,000
Gas Emperor [Member] |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |
Impairment of long-lived assets to be disposed of |  |  | 580,004 |  |  |  |  |  |  |  |
Disposal group, including discontinued operation, consideration |  |  |  |  |  |  |  |  |  | $ 2,900,000 |
Gas Moxie [Member] |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |
Impairment of long-lived assets to be disposed of |  |  | 570,626 |  |  |  |  |  |  |  |
Disposal group, including discontinued operation, consideration |  |  |  |  |  |  |  |  | $ 2,575,000 |  |
Gas Nirvana [Member] |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |
Disposal group, including discontinued operation, consideration |  |  |  |  |  |  |  | $ 3,675,000 |  |  |
Impairment of long-lived assets held-for-use |  |  | 1,406,718 |  |  |  |  |  |  |  |
Gas Icon Gas Emperor Gax Moxie Gas Nirvana [Member] |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net (gain)/loss on sale of vessels |  |  | $ 77,314 |  |  |  |  |  |  |  |
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 |  |  |  |  |  |  |  |  |
Gas Defiance, Gas Shuriken, Gas Haralambos and Eco Lucidity [Member] | Subsequent Event [Member] |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of joint venture agreements | Agreement | 4 |  |  |  |  |  |  |  |  |  |
Interest acquired on joint venture agreements | 49.90% |  |  |  |  |  |  |  |  |  |
Number of vessel owning companies | Vessel | 4 |  |  |  |  |  |  |  |  |  |

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