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Commitments and Contingencies (Details) - Vessel	11 Months Ended	12 Months Ended
	Nov. 15, 2018	Dec. 31, 2018
Commitments and Contingencies Disclosure [Abstract]
Number of vessels owned	19	38

X

- Definition

Number of vessels owned.

+ References

No definition available.

+ Details

Name:	gsl_NumberOfVesselsOwned
Namespace Prefix:	gsl_
Data Type:	xbrli:positiveIntegerItemType
Balance Type:	na
Period Type:	duration

X

- References

No definition available.

+ Details

Name:	us-gaap_CommitmentsAndContingenciesDisclosureAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration