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Intangible Assets/Liabilities - Charter Agreements - Schedule of Intangible Liabilities (Table) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017
Intangible Liability Disclosure [Abstract] |  |
Opening balance | $ 10,482 | $ 12,527
Amortization in period | (2,012) | (2,045)
Closing balance | $ 8,470 | $ 10,482

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- Definition Amount of non-cash amortization of intangible liability for below market leases. + References No definition available. + Details
Name: | gsl_AmortizationOfBelowMarketLeases
Namespace Prefix: | gsl_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Non current portion of the excess of the market value of vessel charters over contracted value of the charters at the date of merger. The intangible lease liability is amortized as an increase in time charter revenue over the remaining term of the relevant charter. + References No definition available. + Details
Name: | gsl_IntangibleLiabilityCharterAgreementsNoncurrent
Namespace Prefix: | gsl_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Intangible Liability Disclosure [Abstract] + References No definition available. + Details
Name: | gsl_IntangibleLiabilityDisclosureAbstract
Namespace Prefix: | gsl_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration