XML 198 R74.htm IDEA: XBRL DOCUMENT
v3.19.1

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