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Segment Information (Details) | 6 Months Ended
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Jun. 30, 2015 item
Segment Information |
Number of reportable Segments | 3
Number of geographic operating segments | 4

X
- Definition Number of geographic operating segments. + References No definition available. + Details
Name: | pag_NumberOfGeographicOperatingSegments
Namespace Prefix: | pag_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements. + References No definition available. + Details
Name: | us-gaap_NumberOfReportableSegments
Namespace Prefix: | us-gaap_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_SegmentReportingAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration