2.4.0.82207201 - Disclosure - Interim Financial Information Interim Financial Information (Policies)truefalsefalse1false falsefalseD2013Q2YTDhttp://www.sec.gov/CIK0001031203duration2013-01-01T00:00:002013-06-30T00:00:001true 1gpi_InterimAccountingPoliciesAbstractgpi_falsenadurationfalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00falsefalsefalsexbrli:stringItemTypestringfalse0Interim Accounting Policies [Abstract]2false 2us-gaap_BusinessCombinationsPolicyus-gaap_truenadurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1falsefalsefalse00<div style="font-family:Times New Roman;font-size:10pt;"><div style="line-height:120%;padding-bottom:8px;padding-top:4px;text-indent:24px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;font-style:italic;font-weight:bold;">Business and Organization</font></div><div style="line-height:120%;padding-bottom:8px;padding-top:4px;text-indent:36px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">Group 1 Automotive, Inc., a Delaware corporation, through its regions, is a leading operator in the automotive retailing industry with operations in </font><font style="font-family:inherit;font-size:10pt;color:#000000;text-decoration:none;">15</font><font style="font-family:inherit;font-size:10pt;"> states in the United States of America (“U.S.”), </font><font style="font-family:inherit;font-size:10pt;color:#000000;text-decoration:none;">13</font><font style="font-family:inherit;font-size:10pt;"> towns in the United Kingdom (“U.K.”) and </font><font style="font-family:inherit;font-size:10pt;color:#000000;text-decoration:none;">two</font><font style="font-family:inherit;font-size:10pt;"> states in Brazil. Group 1 Automotive, Inc. and its subsidiaries are collectively referred to as the “Company” in these Notes to Consolidated Financial Statements. The Company, through its regions, sells new and used cars and light trucks; arranges related vehicle financing, service and insurance contracts; provides automotive maintenance and repair services; and sells vehicle parts.</font></div><div style="line-height:120%;padding-bottom:8px;padding-top:4px;text-indent:36px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">As of </font><font style="font-family:inherit;font-size:10pt;color:#000000;text-decoration:none;">June 30, 2013</font><font style="font-family:inherit;font-size:10pt;">, the Company’s U.S. retail network consisted of the following two regions (with the number of dealerships they comprised): (a) the East (</font><font style="font-family:inherit;font-size:10pt;color:#000000;text-decoration:none;">44</font><font style="font-family:inherit;font-size:10pt;"> dealerships in Alabama, Florida, Georgia, Louisiana, Maryland, Massachusetts, Mississippi, New Hampshire, New Jersey, New York and South Carolina), and (b) the West (</font><font style="font-family:inherit;font-size:10pt;color:#000000;text-decoration:none;">65</font><font style="font-family:inherit;font-size:10pt;"> dealerships in California, Kansas, Louisiana, Oklahoma, and Texas). Each region is managed by a regional vice president who reports directly to the Company’s Chief Executive Officer and is responsible for the overall performance of their regions. The financial matters of each region are managed by a regional chief financial officer who reports directly to the Company’s Chief Financial Officer. The Company’s two international regions consist of </font><font style="font-family:inherit;font-size:10pt;color:#000000;text-decoration:none;">14</font><font style="font-family:inherit;font-size:10pt;"> dealerships in the U.K. and </font><font style="font-family:inherit;font-size:10pt;color:#000000;text-decoration:none;">18</font><font style="font-family:inherit;font-size:10pt;"> dealerships in Brazil, which are also managed locally with direct reporting responsibilities to the Company’s corporate management team. </font></div><div style="line-height:120%;padding-bottom:8px;padding-top:4px;text-indent:36px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">The Company's operating results are generally subject to changes in the economic environment as well as seasonal variations. Generally there are higher volumes of vehicles sales and service in the second and third calendar quarters of each year in the U.S., in the first and third quarters in the U.K. and during the third and fourth quarters in Brazil. This seasonality is generally attributable to consumer buying trends and the timing of manufacturer new vehicle model introductions. In addition, in some regions of the U.S., vehicle purchases decline during the winter months due to inclement weather. As a result, revenues and operating income are typically lower in the first and fourth quarters and higher in the second and third quarters. Other factors unrelated to seasonality, such as changes in economic condition, manufacturer incentive programs, or shifts in governmental taxes or regulations may exaggerate seasonal or cause counter-seasonal fluctuations in our revenues and operating income.</font></div></div>falsefalsefalsenonnum:textBlockItemTypenaDisclosure of accounting policy for completed business combinations (purchase method, acquisition method or combination of entities under common control). This accounting policy may include a general discussion of the purchase method or acquisition method of accounting (including for example, the treatment accorded contingent consideration, the identification of assets and liabilities, the purchase price allocation process, how the fair values of acquired assets and liabilities are determined) and the entity's specific application thereof. An entity that acquires another entity in a leveraged buyout transaction generally discloses the accounting policy followed by the acquiring entity in determining the basis used to value its interest in the acquired entity, and the rationale for that accounting policy.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6367646&loc=d3e18780-107790 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -URI http://asc.fasb.org/subtopic&trid=2303973 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 05 -Paragraph 4 -Subparagraph (a)-(d) -URI http://asc.fasb.org/extlink&oid=6909625&loc=d3e227-128457 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 141R -Paragraph 6 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 141R -Paragraph 7 -Subparagraph a, b, c, d -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Emerging Issues Task Force (EITF) -Number 88-16 -Section SEC Observer Comments -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 141 -Paragraph 9, 10, 11, 12, 13 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. false0Business and Organization[Text Block]3false 2us-gaap_BasisOfPresentationAndSignificantAccountingPoliciesTextBlockus-gaap_truenadurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1falsefalsefalse00<div style="font-family:Times New Roman;font-size:10pt;"><div style="line-height:120%;padding-bottom:8px;padding-top:4px;text-indent:24px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;font-style:italic;font-weight:bold;">Basis of Presentation</font></div><div style="line-height:120%;padding-bottom:8px;padding-top:4px;text-indent:36px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">The accompanying unaudited condensed Consolidated Financial Statements have been prepared in accordance with accounting principles generally accepted in the U.S. for interim financial information and with the instructions to Form 10-Q and Article 10 of Regulation S-X. Accordingly, they do not include all of the information and footnotes required by accounting principles generally accepted in the U.S. for complete financial statements. In the opinion of management, all adjustments of a normal and recurring nature considered necessary for a fair presentation have been included in the accompanying unaudited condensed Consolidated Financial Statements. Due to seasonality and other factors, the results of operations for the interim period are not necessarily indicative of the results that will be realized for the entire fiscal year. For further information, refer to the Consolidated Financial Statements and footnotes thereto included in the Company’s Annual Report on Form 10-K for the year ended </font><font style="font-family:inherit;font-size:10pt;color:#000000;text-decoration:none;">December 31, 2012</font><font style="font-family:inherit;font-size:10pt;"> (“2012 Form 10-K”).</font></div><div style="line-height:120%;padding-bottom:8px;padding-top:4px;text-indent:36px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">All business acquisitions completed during the periods presented have been accounted for using the purchase method of accounting, and their results of operations are included from the effective dates of the closings of the acquisitions. The allocations of purchase price to the assets acquired and liabilities assumed are assigned and recorded based on estimates of fair value. All intercompany balances and transactions have been eliminated in consolidation.</font></div></div>falsefalsefalsenonnum:textBlockItemTypenaThe entire disclosure for the basis of presentation and significant accounting policies concepts. Basis of presentation describes the underlying basis used to prepare the financial statements (for example, US Generally Accepted Accounting Principles, Other Comprehensive Basis of Accounting, IFRS). Accounting policies describe all significant accounting policies of the reporting entity.No definition available.false0Basis of Presentation [Text Block]4false 2us-gaap_SegmentReportingPolicyPolicyTextBlockus-gaap_truenadurationfalsefalsefalsefalsefalsefalsefalsefalseverboseLabel1falsefalsefalse00<div style="font-family:Times New Roman;font-size:10pt;"><div style="line-height:120%;padding-bottom:8px;padding-top:4px;text-align:left;text-indent:24px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;font-style:italic;font-weight:bold;">Business Segment Information</font></div><div style="line-height:120%;padding-bottom:8px;padding-top:4px;text-align:left;text-indent:36px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">The Company, through its regions, conducts business in the automotive retailing industry. All of the segments sell new and used cars and light trucks, arrange related vehicle financing, service and insurance contracts, provide automotive maintenance and repair services and sell vehicle parts. Effective with the acquisition of UAB Motors Participações S.A. (“UAB Motors”) on February 28, 2013, the Company is aligned into four geographic regions: the East and West Regions in the U.S., the U.K. Region, and the Brazil Region. Also, in conjunction with the acquisition of UAB Motors and consistent with how the Company's chief operating decision maker is evaluating performance and allocating resources, the Company reaffirmed that each region represents an operating segment. As part of this determination, the Company, as it has historically, concluded that the East and West Regions of the U.S. are economically similar in that they deliver the same products and services to a common customer group, their customers are generally individuals, they follow the same procedures and methods in managing their operations, and they operate in similar regulatory environments and, therefore, the Company aggregates these two regions into one reportable segment. As such, the Company's three reportable segments are the U.S., which includes the activities of the Company's corporate office, the U.K. and Brazil.</font></div></div>falsefalsefalsenonnum:textBlockItemTypenaDisclosure of accounting policy for segment reporting.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6367646&loc=d3e18780-107790 false0Segment Reporting Disclosure [Text Block]5false 2us-gaap_ConsolidationVariableInterestEntityPolicyus-gaap_truenadurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1falsefalsefalse00<div style="font-family:Times New Roman;font-size:10pt;"><div style="line-height:120%;padding-bottom:8px;padding-top:4px;text-indent:24px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;font-style:italic;font-weight:bold;">Variable Interest Entity</font></div><div style="line-height:120%;padding-bottom:8px;padding-top:4px;text-indent:36px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">In 2013, the Company entered into arrangements to provide a fixed-interest-rate working capital loan and various administrative services to a related-party entity that owns and operates retail automotive dealerships for a variable fee, both of which constitute variable interests in the entity. The Company's exposure to loss as a result of its involvement in the entity includes the balance outstanding under the loan arrangement. The Company holds no equity ownership interest in the entity, and has determined that the entity meets the criteria of a variable interest entity ("VIE"). The terms of the loan and services agreements provide the Company with the rights to control the activities of the VIE that most significantly impact the VIE's economic performance, the obligation to absorb potentially significant losses of the VIE and the right to receive potentially significant benefits from the VIE. Accordingly, the Company qualified as the VIE's primary beneficiary and consolidated 100% of the assets and liabilities of the VIE as of June 30, 2013, as well as 100% of the results of operations of the VIE beginning on the effective date of the variable interests arrangements to June 30, 2013. The floorplan notes payable liability of the VIE is securitized by the new and used vehicle inventory of the VIE, as well as the associated receivable balances from the sale of such inventory to the extent necessary. The preliminary carrying amounts and classification of assets and liabilities (for which creditors do not have recourse to the general credit of the Company) are included within amounts from the Company's purchase price allocations. As discussed in Note 2, "Acquisitions and Dispositions," the allocations are based on estimates and assumptions that are subject to change within the purchase price allocation period. The assets and liabilities included in the Company's consolidated statements of financial position for the consolidated VIE are as follows (in thousands): </font></div><div style="line-height:120%;padding-bottom:8px;padding-top:4px;text-align:center;font-size:10pt;"><div style="padding-left:0px;text-indent:0px;line-height:normal;padding-top:10px;"><table cellpadding="0" cellspacing="0" style="font-family:Times New Roman;font-size:10pt;margin-left:auto;margin-right:auto;width:58.28460038986355%;border-collapse:collapse;text-align:left;"><tr><td colspan="6" rowspan="1"></td></tr><tr><td width="73%" rowspan="1" colspan="1"></td><td width="1%" rowspan="1" colspan="1"></td><td width="1%" rowspan="1" colspan="1"></td><td width="23%" rowspan="1" colspan="1"></td><td width="1%" rowspan="1" colspan="1"></td><td width="1%" rowspan="1" colspan="1"></td></tr><tr><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1" colspan="1"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"> </font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1" colspan="1"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"> </font></div></td><td colspan="3" style="vertical-align:bottom;border-bottom:1px solid #000000;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1"><div style="text-align:center;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;font-weight:bold;">June 30, 2013</font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1" colspan="1"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"> </font></div></td></tr><tr><td style="vertical-align:bottom;background-color:#cceeff;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1" colspan="1"><div style="text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">Current Assets</font></div></td><td style="vertical-align:bottom;background-color:#cceeff;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1" colspan="1"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"> </font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;background-color:#cceeff;border-top:1px solid #000000;" rowspan="1" colspan="1"><div style="text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">$</font></div></td><td style="vertical-align:bottom;background-color:#cceeff;padding-top:2px;padding-bottom:2px;border-top:1px solid #000000;" rowspan="1" colspan="1"><div style="text-align:right;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">25,280</font></div></td><td style="vertical-align:bottom;background-color:#cceeff;border-top:1px solid #000000;" rowspan="1" colspan="1"><div style="text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"><br clear="none"/></font></div></td><td style="vertical-align:bottom;background-color:#cceeff;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1" colspan="1"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"> </font></div></td></tr><tr><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1" colspan="1"><div style="text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">Non-current Assets</font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1" colspan="1"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"> </font></div></td><td colspan="2" style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;" rowspan="1"><div style="text-align:right;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">75,817</font></div></td><td style="vertical-align:bottom;" rowspan="1" colspan="1"><div style="text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"><br clear="none"/></font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1" colspan="1"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"> </font></div></td></tr><tr><td style="vertical-align:bottom;background-color:#cceeff;padding-left:20px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1" colspan="1"><div style="text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">Total Assets</font></div></td><td style="vertical-align:bottom;background-color:#cceeff;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1" colspan="1"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"> </font></div></td><td style="vertical-align:bottom;border-bottom:3px double #000000;padding-left:2px;padding-top:2px;padding-bottom:2px;background-color:#cceeff;border-top:1px solid #000000;" rowspan="1" colspan="1"><div style="text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">$</font></div></td><td style="vertical-align:bottom;border-bottom:3px double #000000;background-color:#cceeff;padding-top:2px;padding-bottom:2px;border-top:1px solid #000000;" rowspan="1" colspan="1"><div style="text-align:right;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">101,097</font></div></td><td style="vertical-align:bottom;border-bottom:3px double #000000;background-color:#cceeff;border-top:1px solid #000000;" rowspan="1" colspan="1"><div style="text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"><br clear="none"/></font></div></td><td style="vertical-align:bottom;background-color:#cceeff;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1" colspan="1"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"> </font></div></td></tr><tr><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1" colspan="1"><div style="text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">Current Liabilities</font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1" colspan="1"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"> </font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;" rowspan="1" colspan="1"><div style="text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">$</font></div></td><td style="vertical-align:bottom;padding-top:2px;padding-bottom:2px;" rowspan="1" colspan="1"><div style="text-align:right;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">21,701</font></div></td><td style="vertical-align:bottom;" rowspan="1" colspan="1"><div style="text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"><br clear="none"/></font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1" colspan="1"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"> </font></div></td></tr><tr><td style="vertical-align:bottom;background-color:#cceeff;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1" colspan="1"><div style="text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">Non-current Liabilities</font></div></td><td style="vertical-align:bottom;background-color:#cceeff;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1" colspan="1"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"> </font></div></td><td colspan="2" style="vertical-align:bottom;background-color:#cceeff;padding-left:2px;padding-top:2px;padding-bottom:2px;" rowspan="1"><div style="text-align:right;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">26,928</font></div></td><td style="vertical-align:bottom;background-color:#cceeff;" rowspan="1" colspan="1"><div style="text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"><br clear="none"/></font></div></td><td style="vertical-align:bottom;background-color:#cceeff;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1" colspan="1"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"> </font></div></td></tr><tr><td style="vertical-align:bottom;padding-left:20px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1" colspan="1"><div style="text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">Total Liabilities</font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1" colspan="1"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"> </font></div></td><td style="vertical-align:bottom;border-bottom:3px double #000000;padding-left:2px;padding-top:2px;padding-bottom:2px;border-top:1px solid #000000;" rowspan="1" colspan="1"><div style="text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">$</font></div></td><td style="vertical-align:bottom;border-bottom:3px double #000000;padding-top:2px;padding-bottom:2px;border-top:1px solid #000000;" rowspan="1" colspan="1"><div style="text-align:right;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">48,629</font></div></td><td style="vertical-align:bottom;border-bottom:3px double #000000;border-top:1px solid #000000;" rowspan="1" colspan="1"><div style="text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"><br clear="none"/></font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1" colspan="1"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"> </font></div></td></tr></table></div></div></div>falsefalsefalsenonnum:textBlockItemTypenaDisclosure of accounting policy for consolidation to describe the significant judgments and assumptions made in determining whether a variable interest held by the entity requires the variable interest entity to be consolidated and (or) disclose information about its involvement with the variable interest entity; the methodology used by the entity for determining whether or not it is the primary beneficiary of the variable interest entity; and the significant factors considered and judgments made in determining that the power to direct the activities that significantly impact the economic performance of the variable interest entity are shared (as defined).Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6367646&loc=d3e18780-107790 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -URI http://asc.fasb.org/subtopic&trid=2197480 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Interpretation (FIN) -Number 46R -Paragraph 14, 15 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 50 -Paragraph 5A -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=7880789&loc=SL6759159-111685 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=7880789&loc=d3e5728-111685 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 50 -Paragraph 2AA -Subparagraph a -URI http://asc.fasb.org/extlink&oid=7880789&loc=SL6759068-111685 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 167 -Paragraph 24 -Subparagraph e -Appendix D Reference 8: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 167 -Paragraph 22E -Subparagraph a -Appendix D Reference 9: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 167 -Paragraph 22B -Subparagraph a -Appendix D false0Consolidation, Variable Interest Entity, Policy [Policy Text Block]6false 2gpi_RecentAccountingPronouncementsPolicyTextBlockgpi_falsenadurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1falsefalsefalse00<div style="font-family:Times New Roman;font-size:10pt;"><div style="line-height:120%;padding-bottom:8px;padding-top:4px;text-indent:24px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;font-style:italic;font-weight:bold;">Recent Accounting Pronouncements</font></div><div style="line-height:120%;padding-bottom:8px;padding-top:4px;text-indent:36px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">In February 2013, the Financial Accounting Standards Board ("FASB") issued Accounting Standards Update ("ASU") No. 2013-2, </font><font style="font-family:inherit;font-size:10pt;font-style:italic;">Reporting of Amounts Reclassified Out of Accumulated Other Comprehensive Income </font><font style="font-family:inherit;font-size:10pt;">("ASU 2013-02"), which requires an entity to provide information about the amounts reclassified out of accumulated other comprehensive income by component. In addition, an entity is required to present, either on the face of the statement where net income is presented or in the notes, significant amounts reclassified out of accumulated other comprehensive income by the respective line items of net income but only if the amount reclassified is required under GAAP to be reclassified to net income in its entirety in the same reporting period. For other amounts that are not required under GAAP to be reclassified in their entirety to net income, an entity is required to cross-reference to other disclosures required under GAAP that provide additional detail about those amounts. The Company's adoption of ASU No. 2013-2 as of March 31, 2013 did not have a material impact on the Company's consolidated financial statements. </font></div></div>falsefalsefalsenonnum:textBlockItemTypenaRecent accounting pronouncements.No definition available.false0Recent Accounting Pronouncements Policy [Text Block]falseInterim Financial Information Interim Financial Information (Policies)UnKnownUnKnownUnKnownUnKnowntruefalsefalseSheethttp://www.group1auto.com/role/InterimFinancialInformationInterimFinancialInformationPolicies16