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Derivatives and Fair Value Disclosures - Additional Information - 2 (Detail) | 3 Months Ended | 6 Months Ended | 9 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
Dec. 31, 2017 USD ($) | Jun. 30, 2017 USD ($) | Sep. 30, 2018 USD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) Vessel | Dec. 31, 2016 USD ($) | Jun. 30, 2018 USD ($) | Sep. 30, 2017 USD ($)
Derivatives, Fair Value [Line Items] |  |  |  |  |  |  |  |
Depreciation, total |  |  |  | $ 41,258,142 | $ 38,921,672 | $ 39,096,589 |  |
Impairment of long-lived assets held-for-use |  |  |  |  | $ 2,156,002 |  |  |
Number of vessels impaired during period | Vessel |  |  |  |  | 3 |  |  |
Impairment of long-lived assets to be disposed of |  |  |  | 11,351,821 | $ 4,305,271 |  |  |
Number of vessels classified as held for sale during period | Vessel |  |  |  |  | 4 |  |  |
Gas Monarch [Member] |  |  |  |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |  |  |  |
Long-lived assets held-for-use, fair value disclosure |  | $ 6,000,000 |  |  |  |  |  |
Depreciation, total |  | $ 255,015 |  |  |  |  |  |
Long-lived assets held-for-use, fair value disclosure, net | $ 5,744,985 |  |  |  | $ 5,744,985 |  |  |
Gas Pasha And Gas Evoluzione [Member] |  |  |  |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |  |  |  |
Long-lived assets held-for-use, fair value disclosure |  |  |  |  |  |  |  | $ 8,000,000
Depreciation, total | 200,130 |  |  |  |  |  |  |
Long-lived assets held-for-use, fair value disclosure, net | $ 7,799,870 |  |  |  | $ 7,799,870 |  |  |
Gas Sincerity and Gas Texiana [Member] |  |  |  |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |  |  |  |
Long-lived assets held-for-use, fair value disclosure, net |  |  |  | 8,958,000 |  |  |  |
Assets held-for-sale, long lived, fair value disclosure |  |  | $ 9,400,000 |  |  |  | $ 9,400,000 |
Assets held for sale, costs to sell |  |  | $ 442,000 |  |  |  |  |
Gas Defiance, Gas Shuriken, Gas Haralambos and Eco Lucidity [Member] |  |  |  |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |  |  |  |
Assets held-for-sale, long lived, fair value disclosure |  |  |  | 55,230,000 |  |  |  |
Assets held for sale, costs to sell |  |  |  | $ 0 |  |  |  |

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