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Income Taxes Effective Tax Rate Reconciliation (Details)
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Tax provision at statutory rate 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate
Effect of acquisitions/divestitures 0.00%gwr_EffectiveIncomeTaxRateReconciliationAcquisitionsDivestitures 0.00%gwr_EffectiveIncomeTaxRateReconciliationAcquisitionsDivestitures 24.80%gwr_EffectiveIncomeTaxRateReconciliationAcquisitionsDivestitures
Effect of foreign operations (1.70%)us-gaap_EffectiveIncomeTaxRateReconciliationForeignIncomeTaxRateDifferential (2.10%)us-gaap_EffectiveIncomeTaxRateReconciliationForeignIncomeTaxRateDifferential (7.70%)us-gaap_EffectiveIncomeTaxRateReconciliationForeignIncomeTaxRateDifferential
State income taxes, net of federal income tax benefit 2.80%us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes 2.20%us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes 3.80%us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes
Benefit of track maintenance credit (7.30%)us-gaap_EffectiveIncomeTaxRateReconciliationTaxCreditsOther (21.00%)us-gaap_EffectiveIncomeTaxRateReconciliationTaxCreditsOther 0.00%us-gaap_EffectiveIncomeTaxRateReconciliationTaxCreditsOther
Other, net 0.30%us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments 0.40%us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments (0.30%)us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments
Effective income tax rate 29.10%us-gaap_EffectiveIncomeTaxRateContinuingOperations 14.50%us-gaap_EffectiveIncomeTaxRateContinuingOperations 55.60%us-gaap_EffectiveIncomeTaxRateContinuingOperations