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Deferred charges, net (Details)	12 Months Ended
	Dec. 31, 2018
Deferred Costs, Noncurrent [Abstract]
Period between scheduled regulatory drydockings	5 years

X

- Definition

Period between scheduled drydockings.

+ References

No definition available.

+ Details

Name:	gsl_PeriodBetweenScheduledDrydockings
Namespace Prefix:	gsl_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- References

No definition available.

+ Details

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