Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	3 Months Ended
Mar. 31, 2015	Mar. 31, 2014
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income	$ 35,815us-gaap_NetIncomeLoss	$ 31,303us-gaap_NetIncomeLoss
Adjustments to reconcile net income to net cash provided by (used in) operating activities:
Depreciation and amortization	11,684	9,925
Deferred income taxes	3,320us-gaap_DeferredIncomeTaxExpenseBenefit	2,913us-gaap_DeferredIncomeTaxExpenseBenefit
Stock-based compensation	4,888us-gaap_ShareBasedCompensation	3,660us-gaap_ShareBasedCompensation
Amortization of debt discount and issue costs	899	3,612
(Gain) loss on disposition of assets	8gpi_GainLossOnSaleOfAssets	(16)gpi_GainLossOnSaleOfAssets
Tax effect from excess stock-based compensation	(1,004)	(733)
Other	1,729us-gaap_OtherNoncashIncomeExpense	544us-gaap_OtherNoncashIncomeExpense
Changes in operating assets and liabilities, net of effects of acquisitions and dispositions:
Accounts payable and accrued expenses	(10,329)	46,555
Accounts and notes receivable	6,275	4,822
Inventories	(1,469)	38,269
Contracts-in-transit and vehicle receivables	10,487	16,780
Prepaid expenses and other assets	2,589	2,697
IncreaseDecreaseFloorPlanNotes	(6,589)gpi_Increasedecreasefloorplannotes	(27,643)gpi_Increasedecreasefloorplannotes
Deferred revenues	(136)	504
Net cash provided by (used in) operating activities	58,167	133,192
CASH FLOWS FROM INVESTING ACTIVITIES:
Cash paid in acquisitions, net of cash received	(50,142)	(52,648)
Proceeds from disposition of franchises, property and equipment	1,171	197
Purchases of property and equipment, including real estate	(23,157)	(27,095)
Other	287	(1,539)
Net cash provided by (used in) investing activities	(71,841)	(81,085)
CASH FLOWS FROM FINANCING ACTIVITIES:
Borrowings on credit facility - Floorplan Line	1,597,034	1,503,650
Repayments on credit facility - Floorplan Line	(1,641,072)	(1,511,811)
Borrowings on Credit Facility - Acquisition Line	189,933	19,963
Repayments on Credit Facility - Acquisition Line	(135,907)	(30,000)
Borrowings on real estate credit facility	0	200
Principal payments on real estate credit facility	(836)	(677)
Borrowings of other long-term debt	13,678	19,683
Principal payments of other long-term debt	(10,644)us-gaap_RepaymentsOfOtherLongTermDebt	(24,321)us-gaap_RepaymentsOfOtherLongTermDebt
Borrowings of long term debt related to real estate loans	17,600	13,855
Principal payments of long-term debt related to real estate loans	(5,622)	(11,510)
Stock Issued During Period, Shares, Employee Stock Purchase Plans	(2,140)	(1,089)
Repurchases of common stock, amounts based on settlement date	(16,175)	(16,942)
Tax effect from excess stock-based compensation	1,004	733
Dividends paid	(4,892)us-gaap_PaymentsOfDividendsCommonStock	(4,115)us-gaap_PaymentsOfDividendsCommonStock
Net cash provided by (used in) financing activities	1,961	(42,381)
Effect of Exchange Rate on Cash and Cash Equivalents	(2,983)	(12,254)
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS	(14,696)	(2,528)
CASH AND CASH EQUIVALENTS, beginning of period	40,975	20,215
CASH AND CASH EQUIVALENTS, end of period	26,279	17,687
SUPPLEMENTAL CASH FLOW INFORMATION:
Purchases of property and equipment, including real estate, accrued in accounts payable and accrued expenses	$ 10,035	$ 656

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-Paragraph 19

-Article 5

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- Definition

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.

+ References

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- Definition

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.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Investing Activities

-URI http://asc.fasb.org/extlink&oid=6516133

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 8

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-Topic 230

-SubTopic 10

-Section 45

-Paragraph 9

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3098-108585

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- Definition

The cash outflow to reacquire common stock during the period.

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-Publisher FASB

-Name Accounting Standards Codification

-Glossary Financing Activities

-URI http://asc.fasb.org/extlink&oid=6513228

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-Topic 230

-SubTopic 10

-Section 45

-Paragraph 15

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3291-108585

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- Definition

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

+ References

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- Definition

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

+ References

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- Definition

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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- Definition

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).

+ References

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-Publisher FASB

-Name Accounting Standards Codification

-Glossary Financing Activities

-URI http://asc.fasb.org/extlink&oid=6513228

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 14

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3255-108585

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- Definition

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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-Name Accounting Standards Codification

-Glossary Financing Activities

-URI http://asc.fasb.org/extlink&oid=6513228

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-Publisher FASB

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-Topic 230

-SubTopic 10

-Section 45

-Paragraph 14

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3255-108585

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- Definition

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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-Publisher FASB

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-SubTopic 10

-Section 45

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- Definition

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.

+ References

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