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Stock-Based Compensation Converted Stock (Details) (USD $)
Oct. 02, 2012
RailAmerica [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
RailAmerica restricted stock awards, prior to conversion 432,000gwr_RailAmericarestrictedstockawardspriortoconversion
/ us-gaap_BusinessAcquisitionAxis
= gwr_RailamericaMember
RailAmerica restricted stock units, prior to conversion 775,000gwr_RailAmericarestrictedstockunitspriortoconversion
/ us-gaap_BusinessAcquisitionAxis
= gwr_RailamericaMember
Restricted Stock Awards  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
G&W Restricted Stock Awards issued upon conversion of unvested RailAmerica Restricted Stock Awards 180,000gwr_NetNumberofNonoptionEquityInstrumentsIssuedUponConversionofAssumedUnvestedRailAmericaRestrictedStockAwards
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
Restricted Stock Unit Awards  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
G&W Restricted Stock Units issued upon conversion of unvested RailAmerica Restricted Stock Units 322,000gwr_NetNumberofNonoptionEquityInstrumentsIssuedUponConversionofAssumedUnvestedRailAmericaRestrictedStockUnits
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
Conversion of RailAmerica to G&W Share-based Compensation Awards  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Conversion ratio 0.4151gwr_ConversionRatio
/ us-gaap_AwardTypeAxis
= gwr_ConversionofRailAmericatoGWSharebasedCompensationUnitsMember
Conversion Ratio, Numerator, acquisition cash purchase price per share 27.50gwr_ConversionRatioNumerator
/ us-gaap_AwardTypeAxis
= gwr_ConversionofRailAmericatoGWSharebasedCompensationUnitsMember
Conversion Ratio, Denominator, Company's average 10-day closing stock price 66.26gwr_ConversionRatioDenominator
/ us-gaap_AwardTypeAxis
= gwr_ConversionofRailAmericatoGWSharebasedCompensationUnitsMember