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v3.19.1

Intangible Assets/Liabilities - Charter Agreements (Details) | 12 Months Ended
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Dec. 31, 2018 Vessel
Poseidon Transaction [Member] |
FiniteLivedIntangibleAssetsAndLiabilitiesLineItems [Line Items] |
Number of vessels related to intangible assets | 2
At Merger [Member] |
FiniteLivedIntangibleAssetsAndLiabilitiesLineItems [Line Items] |
Number of vessels related to intangible liabilities | 5
Number of vessels related to intangible assets | 2

X
- References No definition available. + Details
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Namespace Prefix: | gsl_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number of vessels contracted with finite lived intangible assets. + References No definition available. + Details
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Namespace Prefix: | gsl_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number of vessels contracted with finite lived intangible liability. + References No definition available. + Details
Name: | gsl_NumberOfVesselsContractedWithFiniteLivedIntangibleLiability
Namespace Prefix: | gsl_
Data Type: | xbrli:positiveIntegerItemType
Balance Type: | na
Period Type: | duration

X
- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_BusinessAcquisitionAxis=gsl_AtMergerMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |