Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income (loss)	$ 93,004us-gaap_NetIncomeLoss	$ 113,992us-gaap_NetIncomeLoss	$ 100,209us-gaap_NetIncomeLoss
Adjustments to reconcile net income to net cash provided by (used in) operating activities:
Depreciation and amortization expense	42,344	35,826	31,534
Deferred income taxes	12,319us-gaap_DeferredIncomeTaxExpenseBenefit	22,412us-gaap_DeferredIncomeTaxExpenseBenefit	13,282us-gaap_DeferredIncomeTaxExpenseBenefit
ASSET IMPAIRMENTS	41,520us-gaap_AssetImpairmentCharges	6,542us-gaap_AssetImpairmentCharges	7,276us-gaap_AssetImpairmentCharges
Stock-based compensation	16,012us-gaap_ShareBasedCompensation	13,899us-gaap_ShareBasedCompensation	11,931us-gaap_ShareBasedCompensation
Amortization of debt discount and issue costs	10,559	13,888	12,990
Loss on extinguishment of 3.00% Convertible Notes	29,478	0	0
Loss on extinguishment of 2.25% Convertible Notes	16,925	0	0
(Gain) loss on disposition of assets	(15,994)gpi_GainLossOnSaleOfAssets	(11,043)gpi_GainLossOnSaleOfAssets	(4,941)gpi_GainLossOnSaleOfAssets
Tax effect from excess stock-based compensation	(1,841)	(2,993)	(2,875)
Other	4,686us-gaap_OtherNoncashIncomeExpense	3,665us-gaap_OtherNoncashIncomeExpense	3,965us-gaap_OtherNoncashIncomeExpense
Changes in operating assets and liabilities, net of effects of acquisitions and dispositions:
Accounts payable and accrued expenses	37,344	41,144	29,874
Accounts and notes receivable	(20,179)	(9,489)	(6,777)
Inventories	27,339	(241,871)	(278,232)
Contracts-in-transit and vehicle receivables	(10,530)	(18,974)	(29,091)
Prepaid expenses and other assets	(5,385)	1,941	2,448
Increase/DecreaseFloorPlanNotes	(78,822)gpi_Increasedecreasefloorplannotes	83,203gpi_Increasedecreasefloorplannotes	33,248gpi_Increasedecreasefloorplannotes
Deferred revenues	(491)	230	(163)
Net cash provided by (used in) operating activities	198,288	52,372	(75,322)
CASH FLOWS FROM INVESTING ACTIVITIES:
Cash paid in acquisitions, net of cash received	(336,551)	(269,860)	(177,956)
Proceeds from disposition of franchises, property and equipment	144,597	102,186	39,197
Purchases of property and equipment, including real estate	(150,392)	(102,858)	(88,491)
Other	(4,705)	1,878	2,792
Net Cash Provided by (Used in) Investing Activities	(347,051)	(268,654)	(224,458)
CASH FLOWS FROM FINANCING ACTIVITIES:
Borrowings on credit facility - Floorplan Line	7,832,014	6,379,328	5,700,108
Repayments on credit facility - Floorplan Line	(7,802,719)	(6,153,677)	(5,453,148)
Borrowings on Credit Facility Acquisition Line	389,368	60,000	0
Repayments on Credit Facility Acquisition Line	(379,681)	0	0
Borrowings on mortgage facility	200gpi_BorrowingsOnMortgageFacility	19,640gpi_BorrowingsOnMortgageFacility	18,080gpi_BorrowingsOnMortgageFacility
Principal payments on real estate credit facility	(9,917)gpi_PrincipalPaymentsOnMortgageFacility	(8,597)gpi_PrincipalPaymentsOnMortgageFacility	(2,406)gpi_PrincipalPaymentsOnMortgageFacility
Proceeds from Issuance of Unsecured Debt	539,600	0	0
Payments of Debt Issuance Costs	(1,881)us-gaap_PaymentsOfDebtIssuanceCosts	0us-gaap_PaymentsOfDebtIssuanceCosts	0us-gaap_PaymentsOfDebtIssuanceCosts
Repayments of 3.00% Convertible Notes	(260,074)gpi_Repaymentsof3.00ConvertibleNotes	0gpi_Repaymentsof3.00ConvertibleNotes	0gpi_Repaymentsof3.00ConvertibleNotes
Proceeds from call options and warrants related to 3% Notes	32,697	0	0
Repayments of 2.25% Convertible Notes	(182,756)gpi_Repaymentsof2.25ConvertibleNotes	0gpi_Repaymentsof2.25ConvertibleNotes	0gpi_Repaymentsof2.25ConvertibleNotes
Borrowings of other long-term debt	91,137	10,289	275
Principal payments of other long-term debt	(85,905)us-gaap_RepaymentsOfOtherLongTermDebt	(71,170)us-gaap_RepaymentsOfOtherLongTermDebt	(4,784)us-gaap_RepaymentsOfOtherLongTermDebt
Borrowings of long term debt related to real estate loans	111,979	55,345	70,685
Principal payments of long-term debt related to real estate loans	(50,033)	(36,978)	(15,197)
Issuance of common stock to benefit plans, net of employee net share settlements	(321)	(1,822)	(915)
Repurchases of common stock, amounts based on settlement date	(36,802)	(3,553)	(11,317)
Tax effect from excess stock-based compensation	1,841	2,993	2,875
Dividends paid	(17,097)us-gaap_PaymentsOfDividendsCommonStock	(15,805)us-gaap_PaymentsOfDividendsCommonStock	(13,433)us-gaap_PaymentsOfDividendsCommonStock
Net Cash Provided by (Used in) Financing Activities	171,650	235,993	290,823
EFFECT OF EXCHANGE RATE CHANGES ON CASH	(2,127)	(4,146)	(1,288)
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS	20,760	15,565	(10,245)
CASH AND CASH EQUIVALENTS, beginning of period	20,215	4,650	14,895
CASH AND CASH EQUIVALENTS, end of period	40,975	20,215	4,650
SUPPLEMENTAL CASH FLOW INFORMATION:
Purchases of property and equipment, including real estate, accrued in accounts payable and accrued expenses	$ 21,166	$ 11,155	$ 6,045

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The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

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Other income (expense) included in net income that results in no cash inflows or outflows in the period. Includes noncash adjustments to reconcile net income (loss) to cash provided by (used in) operating activities that are not separately disclosed.

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The net cash outflow or inflow from other investing activities. This element is used when there is not a more specific and appropriate element in the taxonomy.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

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The cash outflow to reacquire common stock during the period.

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The cash outflow paid to third parties in connection with debt origination, which will be amortized over the remaining maturity period of the associated long-term debt.

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Amount of cash outflow in the form of ordinary dividends to common shareholders of the parent entity.

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The cash outflow associated with the acquisition of a business, net of the cash acquired from the purchase.

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The cash outflow associated with the acquisition of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale; includes cash outflows to pay for construction of self-constructed assets.

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The cash inflow from other long-term borrowings not otherwise defined in the taxonomy (with maturities initially due beyond one year or the normal operating cycle of the entity, if longer).

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The total cash inflow associated with the amount received from holders to acquire the entity's shares under incentive and share awards, including stock option exercises. This item inherently excludes any excess tax benefit, which the entity may have realized and reported separately.

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The cash inflow from the issuance of long-term debt that is not secured by collateral. Excludes proceeds from tax exempt unsecured debt.

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The cash outflow attributable to repayments of borrowings not otherwise defined in the taxonomy (with maturities initially due after one year or beyond the operating cycle if longer).

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The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method.

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