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Business Combinations - Activity (Details) - item | 9 Months Ended
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Sep. 30, 2019 | Sep. 30, 2018
The Car People |  |
Business combinations |  |
Number of retail locations acquired |  | 4
Retail Automotive Dealership |  |
Business combinations |  |
Number of acquired franchises |  | 4
Retail Commercial Truck Dealership |  |
Business combinations |  |
Number of dealerships acquired |  | 1
Number of retail locations acquired | 6 |
Commercial Vehicle Distribution |  |
Business combinations |  |
Number of dealerships acquired | 1 |

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- Definition Represents the number of dealerships acquired. + References No definition available. + Details
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Namespace Prefix: | pag_
Data Type: | xbrli:integerItemType
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Period Type: | duration

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- Definition Number of franchises acquired. + References No definition available. + Details
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Namespace Prefix: | pag_
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- Definition Represents the number of retail locations acquired. + References No definition available. + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Details
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- Details
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- Details
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- Details
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