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Subsequent Events - Additional Information (Detail) - USD ($) |  | 12 Months Ended
--- | --- | ---
Mar. 27, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Subsequent Event [Line Items] |  |  |  |
Repayments of debt |  | $ 56,717,059 | $ 56,254,073 | $ 55,630,352
Subsequent Event [Member] | Term Loan Entered Into On April 16, 2014 [Member] |  |  |  |
Subsequent Event [Line Items] |  |  |  |
Repayments of debt | $ 15,780,000 |  |  |

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- Definition The cash outflow during the period from the repayment of aggregate short-term and long-term debt. Excludes payment of capital lease obligations. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3291-108585 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_LongtermDebtTypeAxis=gass_TermLoanEnteredIntoOnApril162014Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |