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Voyage Expenses and Vessel Operating Expenses - Vessel Operating Expenses (Detail) - USD ($) | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Voyage Expenses And Vessel Operating Expenses [Abstract] |  |  |
Crew wages and related costs | $ 30,874,618 | $ 36,628,082 | $ 37,345,800
Insurance | 2,162,523 | 2,068,485 | 2,016,647
Repairs and maintenance | 5,677,033 | 7,359,816 | 6,424,557
Spares and consumable stores | 7,783,902 | 8,907,211 | 8,508,276
Miscellaneous expenses | 3,088,018 | 5,471,184 | 5,124,154
Total | $ 49,586,094 | $ 60,434,778 | $ 59,419,434

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- Definition Other vessel operating expenses. + References No definition available. + Details
Name: | gass_OtherVesselOperatingExpenses
Namespace Prefix: | gass_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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

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- Definition Spares and consumable stores expense. + References No definition available. + Details
Name: | gass_SparesAndConsumableStoresExpense
Namespace Prefix: | gass_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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

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- 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

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- Definition The expense in the period incurred with respect to protection provided by insurance entities against risks other than risks associated with production (which are allocated to cost of sales). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.4) -URI http://asc.fasb.org/extlink&oid=116634182&loc=SL114868664-224227 + Details
Name: | us-gaap_GeneralInsuranceExpense
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Amount of expense for salary, wage, profit sharing; incentive and equity-based compensation; and other employee benefit. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(b)(4)) -URI http://asc.fasb.org/extlink&oid=116634182&loc=SL114868664-224227 + Details
Name: | us-gaap_LaborAndRelatedExpense
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration