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v3.19.1

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