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Segment Information Segment Information (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended |
--- | --- | ---
Mar. 31, 2015 | Mar. 31, 2014 | Dec. 31, 2014
Segment Reporting Information [Line Items] |  |  |
Number of Reportable Segments | 3 us-gaap_NumberOfReportableSegments |  |
Revenues | $ 2,432,854 us-gaap_Revenues | $ 2,260,863 us-gaap_Revenues |
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Extraordinary Items, Noncontrolling Interest | 57,472 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 49,213 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments |
Income Tax Expense (Benefit) | (21,657)us-gaap_IncomeTaxExpenseBenefit | (17,910)us-gaap_IncomeTaxExpenseBenefit |
Net Income (Loss) Attributable to Parent | 35,815 us-gaap_NetIncomeLoss | 31,303 us-gaap_NetIncomeLoss |
Assets | 4,098,467 us-gaap_Assets |  | 4,141,492 us-gaap_Assets
U.S. [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Revenues | 1,998,500 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = gpi_USMember | 1,834,626 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = gpi_USMember |
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Extraordinary Items, Noncontrolling Interest | 53,156 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / us-gaap_StatementBusinessSegmentsAxis = gpi_USMember | 45,862 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / us-gaap_StatementBusinessSegmentsAxis = gpi_USMember |
Income Tax Expense (Benefit) | (20,361)us-gaap_IncomeTaxExpenseBenefit / us-gaap_StatementBusinessSegmentsAxis = gpi_USMember | (16,828)us-gaap_IncomeTaxExpenseBenefit / us-gaap_StatementBusinessSegmentsAxis = gpi_USMember |
Net Income (Loss) Attributable to Parent | 32,795 us-gaap_NetIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = gpi_USMember | 29,034 us-gaap_NetIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = gpi_USMember |
Assets | 3,516,075 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = gpi_USMember |  | 3,529,643 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = gpi_USMember
U.K. [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Revenues | 299,541 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = gpi_UKMember | 247,701 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = gpi_UKMember |
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Extraordinary Items, Noncontrolling Interest | 5,121 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / us-gaap_StatementBusinessSegmentsAxis = gpi_UKMember | 4,617 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / us-gaap_StatementBusinessSegmentsAxis = gpi_UKMember |
Income Tax Expense (Benefit) | (999)us-gaap_IncomeTaxExpenseBenefit / us-gaap_StatementBusinessSegmentsAxis = gpi_UKMember | (965)us-gaap_IncomeTaxExpenseBenefit / us-gaap_StatementBusinessSegmentsAxis = gpi_UKMember |
Net Income (Loss) Attributable to Parent | 4,122 us-gaap_NetIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = gpi_UKMember | 3,652 us-gaap_NetIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = gpi_UKMember |
Assets | 359,588 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = gpi_UKMember |  | 327,644 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = gpi_UKMember
Brazil [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Revenues | 134,813 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = gpi_BrazilMember | 178,536 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = gpi_BrazilMember |
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Extraordinary Items, Noncontrolling Interest | (805)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / us-gaap_StatementBusinessSegmentsAxis = gpi_BrazilMember | (1,266)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / us-gaap_StatementBusinessSegmentsAxis = gpi_BrazilMember |
Income Tax Expense (Benefit) | (297)us-gaap_IncomeTaxExpenseBenefit / us-gaap_StatementBusinessSegmentsAxis = gpi_BrazilMember | (117)us-gaap_IncomeTaxExpenseBenefit / us-gaap_StatementBusinessSegmentsAxis = gpi_BrazilMember |
Net Income (Loss) Attributable to Parent | (1,102)us-gaap_NetIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = gpi_BrazilMember | (1,383)us-gaap_NetIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = gpi_BrazilMember |
Assets | $ 222,804 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = gpi_BrazilMember |  | $ 284,205 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = gpi_BrazilMember

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