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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