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Summary of Significant Accounting Policies (Details 4) (Interest rate swap contracts, USD $) In Millions, unless otherwise specified				12 Months Ended
	Dec. 31, 2013 contract	Dec. 31, 2012 contract	Dec. 31, 2011 contract	Dec. 31, 2011 Cash flow hedge obligation
Accounting for Derivatives and Hedging Activities
Number of outstanding interest rate swap contracts	0	0	0
Number of variable interest payment obligations				2
Reference rate of swap yield curve used to determine fair value of interest rate swaps				LIBOR
Loss in OCI related to interest rate swap contracts qualified for cash flow hedge accounting			$ 4.7
Notional amount				440
Notional value of interest rate swap contracts expiring in October 2011				$ 200

X

- Definition

Aggregate notional amount specified by the derivative(s). Expressed as an absolute value.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Article 12

-Section 13

-Sentence Column B

+ Details

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Namespace Prefix:	invest_
Data Type:	xbrli:monetaryItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Represents the estimated net amount of unrealized gains or losses on interest rate cash flow hedges expected to be reclassified into earnings when interest rate cash flow hedge is discontinued because it is probable that the original forecasted transactions will not occur by the end of the original period.

+ References

No definition available.

+ Details

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Namespace Prefix:	penn_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Represents the portion of the notional amount of interest rate swap contracts expiring in October 2011.

+ References

No definition available.

+ Details

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Namespace Prefix:	penn_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Represents the number of variable interest payment obligations that are settled periodically by swap contracts.

+ References

No definition available.

+ Details

Name:	penn_NumberOfVariableInterestPaymentObligationsToBeSettledPeriodically
Namespace Prefix:	penn_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The reference rate for the variable rate of the interest rate derivative, such as LIBOR or the US Treasury rate and the maturity of the reference rate used, such as three months or six months LIBOR.

+ References

No definition available.

+ Details

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

X

- Definition

Number of interest rate derivative instruments held by the entity at the reporting date.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 10

-Section 50

-Paragraph 1B

-URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5580258-113959



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 10

-Section 50

-Paragraph 1A

-Subparagraph (d)

-URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5579245-113959

+ Details

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- Details

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