Proposed Spin-Off of Real Estate Assets through a Real Estate Investment Trust (Details) (USD $) In Billions, unless otherwise specified	12 Months Ended
Dec. 31, 2012 item
Proposed Spin-Off of Real Estate Assets through a Real Estate Investment Trust
Number of publicly traded companies	2
Special E&P taxable dividend	$ 1.4
Special E&P cash dividend, minimum (as a percent)	20.00%
Period of the Master Lease agreement	35 years
Ownership interest in joint venture (as a percent)	50.00%
Number of non-casino racetracks	7

Represents the entity's ownership interest in a joint venture.

No definition available.

Name:	penn_JointVentureOwnershipInterestPercentage
Namespace Prefix:	penn_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

Represents the period of the Master Lease agreement (including extensions).

No definition available.

Name:	penn_MasterLeasesAgreementPeriodOfLease
Namespace Prefix:	penn_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

Represents the number of non-casino racetracks owned and operated by PNG.

No definition available.

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

Represents the number of publicly traded companies.

No definition available.

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

Name:	penn_ProposedSpinoffOfRealEstateAssetsThroughREITDisclosureAbstract
Namespace Prefix:	penn_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

Represents the percentage of special earnings and profits cash dividend distributable due to tax-free spin-off of real estate assets.

No definition available.

Name:	penn_SpecialEarningsAndProfitsCashDividendPercentageMinimum
Namespace Prefix:	penn_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

Represents the special earnings and profits taxable dividend distributable due to tax-free spin-off of real estate assets.

No definition available.

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