XML 66 R64.htm IDEA: XBRL DOCUMENT
v3.2.0.727

Condensed Consolidated Financial Information Condensed Consolidated Cash Flow (Details) - USD ($) $ in Thousands | 6 Months Ended |  |
--- | --- | --- | ---
Jun. 30, 2015 | Jun. 30, 2014 | Dec. 31, 2014 | Dec. 31, 2013
Net Cash Provided by (Used in) Operating Activities | $ 80,575 | $ 130,933 |  |
Payments to Acquire Businesses, Net of Cash Acquired | (130,783) | (129,276) |  |
Proceeds from disposition of franchises, property and equipment | 7,339 | 9,764 |  |
Payments to Acquire Property, Plant, and Equipment | (48,486) | (68,726) |  |
Payments for (Proceeds from) Other Investing Activities | 6,294 | (6,125) |  |
Net cash provided by (used in) investing activities | (165,636) | (194,363) |  |
Borrowings on credit facility - Floorplan Line | 3,550,526 | 3,735,607 |  |
Repayments On Credit Facility - Floorplan Line | (3,466,772) | (3,762,092) |  |
Borrowings on Credit Facility - Acquisition Line | 346,050 | 89,963 |  |
Repayments on Credit Facility - Acquisition Line | (324,222) | (130,000) |  |
Borrowings On Real Estate Credit Facility | 0 | 200 |  |
Principal Payments On Real Estate Credit Facility | (1,670) | (1,603) |  |
Proceeds from Issuance of Unsecured Debt | 0 | 344,750 |  |
Payments of Debt Issuance Costs | 0 | 1,221 |  |
Repayments of 3.00% Convertible Notes | 0 | 210,356 |  |
Proceeds from Issuance of Other Long-term Debt | 25,744 | 53,038 |  |
Repayments of Other Long-term Debt | (26,942) | (47,167) |  |
Borrowings Of Long Term Debt Related To Real Estate Loans | 22,430 | 32,559 |  |
Principal Payments Of Long Term Debt Related To Real Estate Loans | (12,689) | (16,236) |  |
Proceeds from Issuance of Shares under Incentive and Share-based Compensation Plans, Including Stock Options | (1,113) | 55 |  |
Payments for Repurchase of Common Stock | (33,121) | (16,942) |  |
Excess Tax Benefit from Share-based Compensation, Financing Activities | 1,439 | 1,103 |  |
Payments of Ordinary Dividends, Common Stock | (9,737) | (8,235) |  |
Borrowings (repayments) with subsidiaries | 0 | 0 |  |
Change in investment in subsidiaries | 0 | 0 |  |
Cash Dividends Paid to Parent Company by Consolidated Subsidiaries |  | 0 |  |
Investment in Subsidiaries | 0 |  | $ 0 |
Net cash provided by (used in) financing activities | 69,923 | 63,423 |  |
Effect of Exchange Rate on Cash and Cash Equivalents | (1,612) | 1,087 |  |
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS | (16,750) | 1,080 |  |
Cash and Cash Equivalents, at Carrying Value | 24,225 | 21,295 | 40,975 | $ 20,215
Parent Company [Member] |  |  |  |
Net Cash Provided by (Used in) Operating Activities | 82,124 | 48,165 |  |
Payments to Acquire Businesses, Net of Cash Acquired | 0 | 0 |  |
Proceeds from disposition of franchises, property and equipment | 0 | 0 |  |
Payments to Acquire Property, Plant, and Equipment | 0 | 0 |  |
Payments for (Proceeds from) Other Investing Activities | 0 | 0 |  |
Net cash provided by (used in) investing activities | 0 | 0 |  |
Borrowings on credit facility - Floorplan Line | 0 | 0 |  |
Repayments On Credit Facility - Floorplan Line | 0 | 0 |  |
Borrowings on Credit Facility - Acquisition Line | 346,050 | 89,963 |  |
Repayments on Credit Facility - Acquisition Line | (324,222) | (130,000) |  |
Borrowings On Real Estate Credit Facility |  | 0 |  |
Principal Payments On Real Estate Credit Facility | 0 | 0 |  |
Proceeds from Issuance of Unsecured Debt |  | 344,750 |  |
Payments of Debt Issuance Costs |  | 1,221 |  |
Repayments of 3.00% Convertible Notes |  | 210,356 |  |
Proceeds from Issuance of Other Long-term Debt | 0 | 0 |  |
Repayments of Other Long-term Debt | 0 | 0 |  |
Borrowings Of Long Term Debt Related To Real Estate Loans | 0 | 0 |  |
Principal Payments Of Long Term Debt Related To Real Estate Loans | 0 | 0 |  |
Proceeds from Issuance of Shares under Incentive and Share-based Compensation Plans, Including Stock Options | (1,113) | 55 |  |
Payments for Repurchase of Common Stock | (33,121) | (16,942) |  |
Excess Tax Benefit from Share-based Compensation, Financing Activities | 0 | 0 |  |
Payments of Ordinary Dividends, Common Stock | (9,737) | (8,235) |  |
Borrowings (repayments) with subsidiaries | 80,027 | 90,086 |  |
Change in investment in subsidiaries | (140,008) | (206,265) |  |
Cash Dividends Paid to Parent Company by Consolidated Subsidiaries |  | 0 |  |
Investment in Subsidiaries | 2,102,908 |  | 1,964,442 |
Net cash provided by (used in) financing activities | (82,124) | (48,165) |  |
Effect of Exchange Rate on Cash and Cash Equivalents | 0 | 494 |  |
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS | 0 | 494 |  |
Cash and Cash Equivalents, at Carrying Value | 0 | 494 | 0 | 0
Guarantor Subsidiaries [Member] |  |  |  |
Net Cash Provided by (Used in) Operating Activities | (6,018) | 99,077 |  |
Payments to Acquire Businesses, Net of Cash Acquired | (130,783) | (129,276) |  |
Proceeds from disposition of franchises, property and equipment | 6,845 | 9,489 |  |
Payments to Acquire Property, Plant, and Equipment | (39,305) | (64,039) |  |
Payments for (Proceeds from) Other Investing Activities | 6,294 | (6,125) |  |
Net cash provided by (used in) investing activities | (156,949) | (189,951) |  |
Borrowings on credit facility - Floorplan Line | 3,550,526 | 3,735,607 |  |
Repayments On Credit Facility - Floorplan Line | (3,466,772) | (3,762,092) |  |
Borrowings on Credit Facility - Acquisition Line | 0 | 0 |  |
Repayments on Credit Facility - Acquisition Line | 0 | 0 |  |
Borrowings On Real Estate Credit Facility |  | 200 |  |
Principal Payments On Real Estate Credit Facility | (1,670) | (1,603) |  |
Proceeds from Issuance of Unsecured Debt |  | 0 |  |
Payments of Debt Issuance Costs |  | 0 |  |
Repayments of 3.00% Convertible Notes |  | 0 |  |
Proceeds from Issuance of Other Long-term Debt | 138 | 0 |  |
Repayments of Other Long-term Debt | (989) | 0 |  |
Borrowings Of Long Term Debt Related To Real Estate Loans | 0 | 32,559 |  |
Principal Payments Of Long Term Debt Related To Real Estate Loans | (11,176) | (7,691) |  |
Proceeds from Issuance of Shares under Incentive and Share-based Compensation Plans, Including Stock Options | 0 | 0 |  |
Payments for Repurchase of Common Stock | 0 | 0 |  |
Excess Tax Benefit from Share-based Compensation, Financing Activities | 1,439 | 1,103 |  |
Payments of Ordinary Dividends, Common Stock | 0 | 0 |  |
Borrowings (repayments) with subsidiaries | (54,206) | (116,191) |  |
Change in investment in subsidiaries | 124,918 | 206,389 |  |
Cash Dividends Paid to Parent Company by Consolidated Subsidiaries |  | 2,118 |  |
Investment in Subsidiaries | 0 |  | 0 |
Net cash provided by (used in) financing activities | 142,208 | 90,399 |  |
Effect of Exchange Rate on Cash and Cash Equivalents | 0 | 0 |  |
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS | (20,759) | (475) |  |
Cash and Cash Equivalents, at Carrying Value | 4,620 | 3,831 | 25,379 | 4,306
Non-Guarantor Subsidiaries [Member] |  |  |  |
Net Cash Provided by (Used in) Operating Activities | 4,469 | (16,309) |  |
Payments to Acquire Businesses, Net of Cash Acquired | 0 | 0 |  |
Proceeds from disposition of franchises, property and equipment | 494 | 275 |  |
Payments to Acquire Property, Plant, and Equipment | (9,181) | (4,687) |  |
Payments for (Proceeds from) Other Investing Activities | 0 | 0 |  |
Net cash provided by (used in) investing activities | (8,687) | (4,412) |  |
Borrowings on credit facility - Floorplan Line | 0 | 0 |  |
Repayments On Credit Facility - Floorplan Line | 0 | 0 |  |
Borrowings on Credit Facility - Acquisition Line | 0 | 0 |  |
Repayments on Credit Facility - Acquisition Line | 0 | 0 |  |
Borrowings On Real Estate Credit Facility |  | 0 |  |
Principal Payments On Real Estate Credit Facility | 0 | 0 |  |
Proceeds from Issuance of Unsecured Debt |  | 0 |  |
Payments of Debt Issuance Costs |  | 0 |  |
Repayments of 3.00% Convertible Notes |  | 0 |  |
Proceeds from Issuance of Other Long-term Debt | 25,606 | 53,038 |  |
Repayments of Other Long-term Debt | (25,953) | (47,167) |  |
Borrowings Of Long Term Debt Related To Real Estate Loans | 22,430 | 0 |  |
Principal Payments Of Long Term Debt Related To Real Estate Loans | (1,513) | (8,545) |  |
Proceeds from Issuance of Shares under Incentive and Share-based Compensation Plans, Including Stock Options | 0 | 0 |  |
Payments for Repurchase of Common Stock | 0 | 0 |  |
Excess Tax Benefit from Share-based Compensation, Financing Activities | 0 | 0 |  |
Payments of Ordinary Dividends, Common Stock | 0 | 0 |  |
Borrowings (repayments) with subsidiaries | (25,821) | 26,105 |  |
Change in investment in subsidiaries | 15,090 | (124) |  |
Cash Dividends Paid to Parent Company by Consolidated Subsidiaries |  | (2,118) |  |
Investment in Subsidiaries | 0 |  | 0 |
Net cash provided by (used in) financing activities | 9,839 | 21,189 |  |
Effect of Exchange Rate on Cash and Cash Equivalents | (1,612) | 593 |  |
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS | 4,009 | 1,061 |  |
Cash and Cash Equivalents, at Carrying Value | 19,605 | $ 16,970 | 15,596 | $ 15,909
Consolidation, Eliminations [Member] |  |  |  |
Investment in Subsidiaries | (2,102,908) |  | (1,964,442) |
Cash and Cash Equivalents, at Carrying Value | $ 0 |  | $ 0 |

X
- Definition Borrowings of long term debt related to real estate loans. + References No definition available. + Details
Name: | gpi_BorrowingsOfLongTermDebtRelatedToRealEstateLoans
Namespace Prefix: | gpi_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Borrowings on credit facility acquisition line. + References No definition available. + Details
Name: | gpi_BorrowingsOnCreditFacilityAcquisitionLine
Namespace Prefix: | gpi_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The cash inflow resulting from borrowings under the floorplan line of the revolving credit facility. Borrowings under the floorplan line are used to finance the purchase of specific new, used and rental vehicle inventory. + References No definition available. + Details
Name: | gpi_BorrowingsOnCreditFacilityFloorplanLine
Namespace Prefix: | gpi_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Borrowings on real estate credit facility. + References No definition available. + Details
Name: | gpi_BorrowingsOnRealEstateCreditFacility
Namespace Prefix: | gpi_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Borrowings (repayments) with subsidiaries + References No definition available. + Details
Name: | gpi_Borrowingsrepaymentswithsubsidiaries
Namespace Prefix: | gpi_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Change in investment in subsidiaries + References No definition available. + Details
Name: | gpi_Changeininvestmentinsubsidiaries
Namespace Prefix: | gpi_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Investment in Subsidiaries + References No definition available. + Details
Name: | gpi_InvestmentinSubsidiaries
Namespace Prefix: | gpi_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition The cash outflow resulting from principal payments on borrowings under real estate loans. + References No definition available. + Details
Name: | gpi_PrincipalPaymentsOfLongTermDebtRelatedToRealEstateLoans
Namespace Prefix: | gpi_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The cash outflow resulting from repayments of borrowings under the real estate credit facility. + References No definition available. + Details
Name: | gpi_PrincipalPaymentsOnRealEstateCreditFacility
Namespace Prefix: | gpi_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Cash inflow from the sale of long-lived physical assets, dealership franchises, and related real estate, as applicable. + References No definition available. + Details
Name: | gpi_ProceedsFromDispositionOfFranchisePropertyAndEquipment
Namespace Prefix: | gpi_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Repayments on credit facility acquisition line. + References No definition available. + Details
Name: | gpi_RepaymentsOnCreditFacilityAcquisitionLine
Namespace Prefix: | gpi_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The cash outflow resulting from repayments of borrowings under the floorplan line of the revolving credit facility. Borrowings under the floorplan line are used to finance the purchase of specific new, used and rental vehicle inventory. + References No definition available. + Details
Name: | gpi_RepaymentsOnCreditFacilityFloorplanLine
Namespace Prefix: | gpi_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Repayments of 3.00% Convertible Notes + References No definition available. + Details
Name: | gpi_Repaymentsof3.00ConvertibleNotes
Namespace Prefix: | gpi_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash -URI http://asc.fasb.org/extlink&oid=6506951 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=28358313&loc=d3e6676-107765 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3044-108585 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash Equivalents -URI http://asc.fasb.org/extlink&oid=6507016 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.1) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
Name: | us-gaap_CashAndCashEquivalentsAtCarryingValue
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of increase (decrease) in cash and cash equivalents. Cash and cash equivalents are the amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Includes effect from exchange rate changes. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 24 -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3521-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 230 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=49171198&loc=d3e33268-110906 + Details
Name: | us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition This element represents disclosure of the aggregate cash dividends paid to the entity by consolidated subsidiaries. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 3 -Subparagraph (SX 210.12-04.(b)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24072-122690 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 235 -Section S99 -Paragraph 2 -Subparagraph (SX 210.9-06) -URI http://asc.fasb.org/extlink&oid=6882215&loc=d3e537971-122884 + Details
Name: | us-gaap_CashDividendsPaidToParentCompanyByConsolidatedSubsidiaries
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount of increase (decrease) from the effect of exchange rate changes on cash and cash equivalent balances held in foreign currencies. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 230 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=49171198&loc=d3e33268-110906 + Details
Name: | us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount of cash inflow from realized tax benefit related to deductible compensation cost reported on the entity's tax return for equity instruments in excess of the compensation cost for those instruments recognized for financial reporting purposes. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 20 -Section 55 -Paragraph 24 -URI http://asc.fasb.org/extlink&oid=32706628&loc=d3e11374-113907 + Details
Name: | us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount of cash inflow (outflow) from financing activities, including discontinued operations. Financing activity cash flows include obtaining resources from owners and providing them with a return on, and a return of, their investment; borrowing money and repaying amounts borrowed, or settling the obligation; and obtaining and paying for other resources obtained from creditors on long-term credit. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 24 -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3521-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 26 -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3574-108585 + Details
Name: | us-gaap_NetCashProvidedByUsedInFinancingActivities
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount of cash inflow (outflow) from investing activities, including discontinued operations. Investing activity cash flows include making and collecting loans and acquiring and disposing of debt or equity instruments and property, plant, and equipment and other productive assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 24 -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3521-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 26 -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3574-108585 + Details
Name: | us-gaap_NetCashProvidedByUsedInInvestingActivities
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount of cash inflow (outflow) from operating activities, including discontinued operations. Operating activity cash flows include transactions, adjustments, and changes in value not defined as investing or financing activities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 24 -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3521-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3602-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 25 -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3536-108585 + Details
Name: | us-gaap_NetCashProvidedByUsedInOperatingActivities
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | na
Period Type: | duration

X
- 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 9 -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3098-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3095-108585 + Details
Name: | us-gaap_PaymentsForProceedsFromOtherInvestingActivities
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The cash outflow to reacquire common stock during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3291-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 + Details
Name: | us-gaap_PaymentsForRepurchaseOfCommonStock
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3291-108585 + Details
Name: | us-gaap_PaymentsOfDebtIssuanceCosts
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount of cash outflow in the form of ordinary dividends to common shareholders of the parent entity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3291-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 + Details
Name: | us-gaap_PaymentsOfDividendsCommonStock
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The cash outflow associated with the acquisition of a business, net of the cash acquired from the purchase. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3213-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 + Details
Name: | us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- 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. + 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 13 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3213-108585 + Details
Name: | us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- 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 Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3255-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 + Details
Name: | us-gaap_ProceedsFromIssuanceOfOtherLongTermDebt
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3255-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 + Details
Name: | us-gaap_ProceedsFromIssuanceOfSharesUnderIncentiveAndShareBasedCompensationPlansIncludingStockOptions
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The cash inflow from the issuance of long-term debt that is not secured by collateral. Excludes proceeds from tax exempt unsecured debt. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3255-108585 + Details
Name: | us-gaap_ProceedsFromIssuanceOfUnsecuredDebt
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- 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). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3291-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 + Details
Name: | us-gaap_RepaymentsOfOtherLongTermDebt
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Details
Name: | gpi_CondensedconsolidatedfinancialinformationentitiesAxis=us-gaap_ParentCompanyMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | gpi_CondensedconsolidatedfinancialinformationentitiesAxis=us-gaap_GuarantorSubsidiariesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | gpi_CondensedconsolidatedfinancialinformationentitiesAxis=us-gaap_NonGuarantorSubsidiariesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | gpi_CondensedconsolidatedfinancialinformationentitiesAxis=us-gaap_ConsolidationEliminationsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |