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Commitments and Contingent Liabilities (Details) $ in Millions | 6 Months Ended
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Jun. 30, 2018 USD ($)
Commitments and Contingent Liabilities |
Lease period, minimum | 5 years
Lease period, maximum | 20 years
Loss Contingencies |
Letters of credit outstanding | $ 36.5
Surety bonds posted | $ 27.0

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- Definition Lease period , maximum. + References No definition available. + Details
Name: | pag_LeasePeriodMaximum
Namespace Prefix: | pag_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Definition Lease period , minimum. + References No definition available. + Details
Name: | pag_LeasePeriodMinimum
Namespace Prefix: | pag_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Definition Surety bonds posted. + References No definition available. + Details
Name: | pag_SuretyBondsPosted
Namespace Prefix: | pag_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition The total amount of the contingent obligation under letters of credit outstanding as of the reporting date. + References No definition available. + Details
Name: | us-gaap_LettersOfCreditOutstandingAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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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
Name: | us-gaap_LossContingenciesLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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