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Summary of Significant Accounting Policies (Details 3) (Jamul Tribe, USD $) In Millions, unless otherwise specified | 0 Months Ended |  |  |
--- | --- | --- | --- | ---
Apr. 05, 2013 item acre sqft | Mar. 31, 2015 | Dec. 31, 2014 | Apr. 05, 2013 acre sqft
Jamul Tribe |  |  |  |
Long-term asset related to the Jamul Tribe |  |  |  |
Land owned | 6 us-gaap_AreaOfLand / penn_TypeOfAgreementAxis = penn_DefinitiveAgreementWithJamulIndianVillageMember |  |  | 6 us-gaap_AreaOfLand / penn_TypeOfAgreementAxis = penn_DefinitiveAgreementWithJamulIndianVillageMember
Proposed facility development cost | $ 360 penn_ProposedFacilityDevelopmentCost / penn_TypeOfAgreementAxis = penn_DefinitiveAgreementWithJamulIndianVillageMember |  |  |
Number of stories | 3 penn_NumberOfStories / penn_TypeOfAgreementAxis = penn_DefinitiveAgreementWithJamulIndianVillageMember |  |  |
Size of gaming and entertainment facility | 200,000 us-gaap_AreaOfRealEstateProperty / penn_TypeOfAgreementAxis = penn_DefinitiveAgreementWithJamulIndianVillageMember |  |  | 200,000 us-gaap_AreaOfRealEstateProperty / penn_TypeOfAgreementAxis = penn_DefinitiveAgreementWithJamulIndianVillageMember
Number of slot machines | 1,700 penn_NumberOfSlotMachines / penn_TypeOfAgreementAxis = penn_DefinitiveAgreementWithJamulIndianVillageMember |  |  |
Number of table games | 43 penn_NumberOfTableGames / penn_TypeOfAgreementAxis = penn_DefinitiveAgreementWithJamulIndianVillageMember |  |  |
Number of parking spaces | 1,800 penn_NumberOfParkingSpacesStructure / penn_TypeOfAgreementAxis = penn_DefinitiveAgreementWithJamulIndianVillageMember |  |  |
Loan commitment |  | 400 penn_LoanCommitment / penn_TypeOfAgreementAxis = penn_DefinitiveAgreementWithJamulIndianVillageMember |  |
Anticipated loan funding |  | 360 penn_AnticipatedLoanFunding / penn_TypeOfAgreementAxis = penn_DefinitiveAgreementWithJamulIndianVillageMember |  |
Note receivable |  | 86.4 us-gaap_AccountsAndNotesReceivableNet / penn_TypeOfAgreementAxis = penn_DefinitiveAgreementWithJamulIndianVillageMember | 62.0 us-gaap_AccountsAndNotesReceivableNet / penn_TypeOfAgreementAxis = penn_DefinitiveAgreementWithJamulIndianVillageMember |
Interest Receivable |  | $ 5.0 us-gaap_InterestReceivable / penn_TypeOfAgreementAxis = penn_DefinitiveAgreementWithJamulIndianVillageMember | $ 3.3 us-gaap_InterestReceivable / penn_TypeOfAgreementAxis = penn_DefinitiveAgreementWithJamulIndianVillageMember |

X
- Definition Represents the amount of anticipated loan funding related to facility development. + References No definition available. + Details
Name: | penn_AnticipatedLoanFunding
Namespace Prefix: | penn_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Minimum amount of loan commitment in which the entity has agreed to expend funds to borrower. + References No definition available. + Details
Name: | penn_LoanCommitment
Namespace Prefix: | penn_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Represents the number of parking spaces available. + References No definition available. + Details
Name: | penn_NumberOfParkingSpacesStructure
Namespace Prefix: | penn_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the number of slot machines in the casino. + References No definition available. + Details
Name: | penn_NumberOfSlotMachines
Namespace Prefix: | penn_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the number of stories in the facility. + References No definition available. + Details
Name: | penn_NumberOfStories
Namespace Prefix: | penn_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the number of table games in the casino. + References No definition available. + Details
Name: | penn_NumberOfTableGames
Namespace Prefix: | penn_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the amount of proposed facility development cost. + References No definition available. + Details
Name: | penn_ProposedFacilityDevelopmentCost
Namespace Prefix: | penn_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Details
Name: | penn_SignificantAccountingPoliciesLineItems
Namespace Prefix: | penn_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Carrying amount as of the balance sheet date, net of allowance for doubtful accounts, of account and note receivables due from other than related parties. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.3-4) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Area of land held. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | num:areaItemType
Balance Type: | na
Period Type: | instant

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- Definition Area of a real estate property. + References No definition available. + Details
Name: | us-gaap_AreaOfRealEstateProperty
Namespace Prefix: | us-gaap_
Data Type: | num:areaItemType
Balance Type: | na
Period Type: | instant

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- Definition Carrying amount as of the balance sheet date of interest earned but not received. Also called accrued interest or accrued interest receivable. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.8) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 8 -Article 5 + Details
Name: | us-gaap_InterestReceivable
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant