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v2.4.1.9

Income Taxes (Details 2) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Difference between the income tax computation by the company and the statutory body |  |  |
Provision at the U.S. federal statutory rate | $ 57,540 us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate | $ 67,163 us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate | $ 56,257 us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate
Increase (decrease) resulting from: |  |  |
State income tax, net of benefit for federal deduction | 5,267 us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes | 4,228 us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes | 3,455 us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes
Foreign income tax rate differential | (3,188)us-gaap_IncomeTaxReconciliationForeignIncomeTaxRateDifferential | (538)us-gaap_IncomeTaxReconciliationForeignIncomeTaxRateDifferential | (854)us-gaap_IncomeTaxReconciliationForeignIncomeTaxRateDifferential
Employment credits | (481)us-gaap_IncomeTaxReconciliationTaxCreditsOther | (421)us-gaap_IncomeTaxReconciliationTaxCreditsOther | (291)us-gaap_IncomeTaxReconciliationTaxCreditsOther
Changes in valuation allowances | 9,507 us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance | 2,713 us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance | 183 us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance
Nondeductible Goodwill | 0 gpi_IncomeTaxReconciliationNondeductibleGoodwill | 1,355 gpi_IncomeTaxReconciliationNondeductibleGoodwill | 0 gpi_IncomeTaxReconciliationNondeductibleGoodwill
Income Tax Reconciliation Goodwill created from Restructuring | (10,209)gpi_IncomeTaxReconciliationGoodwillcreatedfromRestructuring | 0 gpi_IncomeTaxReconciliationGoodwillcreatedfromRestructuring | 0 gpi_IncomeTaxReconciliationGoodwillcreatedfromRestructuring
Nondeductible Transaction Costs | 0 us-gaap_IncomeTaxReconciliationNondeductibleExpense | 1,064 us-gaap_IncomeTaxReconciliationNondeductibleExpense | 0 us-gaap_IncomeTaxReconciliationNondeductibleExpense
Stock-based compensation | 245 us-gaap_IncomeTaxReconciliationNondeductibleExpenseShareBasedCompensationCost | 282 us-gaap_IncomeTaxReconciliationNondeductibleExpenseShareBasedCompensationCost | 201 us-gaap_IncomeTaxReconciliationNondeductibleExpenseShareBasedCompensationCost
Income tax reconciliation convertible debt redemption | 9,727 gpi_Incometaxreconciliationconvertibledebtredemption | 0 gpi_Incometaxreconciliationconvertibledebtredemption | 0 gpi_Incometaxreconciliationconvertibledebtredemption
Other | 2,988 us-gaap_IncomeTaxReconciliationOtherAdjustments | 2,057 us-gaap_IncomeTaxReconciliationOtherAdjustments | 1,575 us-gaap_IncomeTaxReconciliationOtherAdjustments
Provision for income taxes | $ 71,396 us-gaap_IncomeTaxExpenseBenefit | $ 77,903 us-gaap_IncomeTaxExpenseBenefit | $ 60,526 us-gaap_IncomeTaxExpenseBenefit

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