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Legal Proceedings and Other Contingencies (Details) (Viareggio [Member], USD $)
In Millions, unless otherwise specified
 3 Months Ended
Mar. 31, 2015
case
Oct. 02, 2013
Insurance_Provider
Dec. 14, 2012
Corporations
Employee
Jun. 29, 2009
Loss Contingencies [Line Items]        
Number of casualties       32gmt_NumberOfCasualties
Number of subsidiaries     2gmt_NumberOfSubsidiaries  
Number of Maintenance and Supervisory employees     10.0gmt_NumberofMaintenanceandSupervisoryemployees  
Number of Italian railway companies     4gmt_NumberOfCompanies  
Number of employees     18dei_EntityNumberOfEmployees  
Loss Contingency, Pending Claims, Number 90us-gaap_LossContingencyPendingClaimsNumber      
Number of insurers   3gmt_NumberOfInsuranceProviders    
Court Proceedings 1gmt_CourtProceedings      
Legal Fees $ 7.8us-gaap_LegalFees      
Percentage of coverage held by Liberty Mutual Insurance Europe Limited   25.00%gmt_PercentageofcoverageheldbyLibertyMutualInsuranceEuropeLimited    
Derailed [Member]        
Loss Contingencies [Line Items]        
number of railcars       14gmt_NumberOfRailars
/ gmt_LitigationCaseDetailsAxis
= gmt_DerailedMember
/ us-gaap_LossContingenciesByNatureOfContingencyAxis
= gmt_ViareggioMember
Overturned [Member]        
Loss Contingencies [Line Items]        
number of railcars       5gmt_NumberOfRailars
/ gmt_LitigationCaseDetailsAxis
= gmt_OverturnedMember
/ us-gaap_LossContingenciesByNatureOfContingencyAxis
= gmt_ViareggioMember
Punctured and Ignited [Member]        
Loss Contingencies [Line Items]        
number of railcars       1gmt_NumberOfRailars
/ gmt_LitigationCaseDetailsAxis
= gmt_PuncturedAndIgnitedMember
/ us-gaap_LossContingenciesByNatureOfContingencyAxis
= gmt_ViareggioMember