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Business Combinations - Activity (Details) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2016 USD ($) item | Dec. 31, 2015 item
Business combinations |  |
Revenue from acquisition | $ | $ 315.9 |
Pre-tax income from acquisition | $ | $ 0.5 |
Retail Automotive Dealership |  |
Business combinations |  |
Number of acquired franchises | item | 20 | 5
Retail Commercial Truck Dealership |  |
Business combinations |  |
Number of dealerships acquired | item | 7 | 2

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- Definition This element represents the amount of pre-tax income of the acquiree since the acquisition date included in the consolidated income statement for the reporting period. + References No definition available. + Details
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Namespace Prefix: | pag_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Number of franchises acquired. + References No definition available. + Details
Name: | pag_NumberOfFranchisesAcquired
Namespace Prefix: | pag_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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- Definition Represents the number of retail locations acquired. + References No definition available. + Details
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Namespace Prefix: | pag_
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Balance Type: | na
Period Type: | duration

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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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- Definition This element represents the amount of revenue of the acquiree since the acquisition date included in the consolidated income statement for the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1) -URI http://asc.fasb.org/extlink&oid=65885119&loc=d3e1392-128463 + Details
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- Details
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Namespace Prefix: |
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- Details
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Data Type: | na
Balance Type: |
Period Type: |