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Document and Entity Information - $ / shares | 6 Months Ended |  |
--- | --- | --- | ---
Jun. 30, 2015 | Jul. 27, 2015 | Dec. 31, 2014
Entity Information [Line Items] |  |  |
Entity Registrant Name | GROUP 1 AUTOMOTIVE INC |  |
Entity Central Index Key | 0001031203 |  |
Document Type | 10-Q |  |
Document Period End Date | Jun. 30, 2015 |  |
Amendment Flag | false |  |
Document Fiscal Year Focus | 2015 |  |
Document Fiscal Period Focus | Q2 |  |
Current Fiscal Year End Date | --12-31 |  |
Entity Filer Category | Large Accelerated Filer |  |
Entity Common Stock, Shares Outstanding |  | 24,115,946 |
Common Stock, Par or Stated Value Per Share |  | $ 0.01 | $ 0.01

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