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Voyage Expenses and Vessel Operating Expenses - Voyage Expenses (Detail) - USD ($) | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Voyage Expenses And Vessel Operating Expenses [Abstract] |  |  |
Port expenses | $ 2,841,661 | $ 2,546,926 | $ 3,306,157
Bunkers | 11,641,615 | 6,668,126 | 6,117,326
Commissions | 4,796,483 | 4,584,612 | 4,259,812
Other voyage expenses | 1,407,416 | 1,916,873 | 1,706,970
Total | $ 20,687,175 | $ 15,716,537 | $ 15,390,265

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- Definition Bunker expense. + References No definition available. + Details
Name: | gass_BunkerExpense
Namespace Prefix: | gass_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Commissions expense. + References No definition available. + Details
Name: | gass_CommissionsExpense
Namespace Prefix: | gass_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Other voyage expense. + References No definition available. + Details
Name: | gass_OtherVoyageExpense
Namespace Prefix: | gass_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Port expenses. + References No definition available. + Details
Name: | gass_PortExpenses
Namespace Prefix: | gass_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Voyage expenses and vesse loperating expenses. + References No definition available. + Details
Name: | gass_VoyageExpensesAndVesselOperatingExpensesAbstract
Namespace Prefix: | gass_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Voyage expenses including related party. + References No definition available. + Details
Name: | gass_VoyageExpensesIncludingRelatedParty
Namespace Prefix: | gass_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration