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Summary of Significant Accounting Policies (Details 3) - Jamul Tribe $ in Millions	Apr. 05, 2013 USD ($) ft² a item	Mar. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)
Long-term asset related to the Jamul Tribe
Land owned | a	6
Proposed facility development cost	$ 360.0
Number of stories | item	3
Size of gaming and entertainment facility | ft²	200,000
Number of slot machines | item	1,700
Number of table games | item	43
Number of parking spaces | item	1,800
Loan commitment		$ 400.0
Anticipated loan funding		360.0
Note receivable		86.4	$ 62.0
Interest Receivable		$ 5.0	$ 3.3

X

- Definition

Represents the amount of anticipated loan funding related to facility development.

+ References

No definition available.

+ Details

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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
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X

- Definition

Represents the number of parking spaces available.

+ References

No definition available.

+ Details

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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

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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

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Namespace Prefix:	penn_
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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

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- References

No definition available.

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Name:	penn_SignificantAccountingPoliciesLineItems
Namespace Prefix:	penn_
Data Type:	xbrli:stringItemType
Balance Type:	na
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- 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

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
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- Definition

Area of land held.

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No definition available.

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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.

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No definition available.

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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

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Details

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Namespace Prefix:
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Balance Type:
Period Type: