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Commitments and Contingencies (Details 2) (USD $) In Millions, unless otherwise specified	1 Months Ended	4 Months Ended	12 Months Ended
	Feb. 28, 2014	Dec. 31, 2014	Dec. 31, 2014 plan employee	Dec. 31, 2013	Dec. 31, 2012
Labor Agreements
Agreements with Sports Arena Employees Ratification Period	3 years
Number of employees under Seafarers Entertainment and Allied Trade Union agreement			1,280penn_AgreementsWithSEATUUnionNumberOfEmployees
Number of employees under Hotel Employees and Restaurant Employees Union Local 1 agreement			191penn_AgreementsWithHotelEmployeesAndRestaurantEmployeesUnionNumberOfEmployees
Number of employees under United Steel Workers			1,321penn_AgreementsWithUnitedSteelWorkersNumberofEmployees
Term		10 years
Profit sharing plan under the provisions of Section 401(k)
Employer's discretionary match contribution up to a maximum of 6% of eligible employee compensation (as a percent)			50.00%us-gaap_DefinedContributionPlanEmployerMatchingContributionPercentOfMatch
Maximum percentage of eligible employee compensation eligible for discretionary employer match contribution			6.00%us-gaap_DefinedContributionPlanEmployerMatchingContributionPercent
Matching contributions for the profit-sharing plan			$ 4.7us-gaap_DeferredCompensationArrangementWithIndividualEmployerContribution	$ 4.6us-gaap_DeferredCompensationArrangementWithIndividualEmployerContribution	$ 3.7us-gaap_DeferredCompensationArrangementWithIndividualEmployerContribution
Defined contribution plan, the Charles Town Races Future Service Retirement Plan
Matching contribution as a percentage of the daily mutual handle			0.25%penn_DefinedContributionPlanEmployerContributionAsPercentageOfDailyMutualHandle
Matching contribution as a percentage of net video lottery revenue up to a base			1.00%penn_DefinedContributionPlanEmployerContributionAsPercentageOfNetVideoLotteryRevenueUpToBase
Matching contribution as a percentage of table revenue after the base is met			0.50%penn_DefinedContributionPlanEmployerContributionAsPercentageOfTableRevenueAfterBaseIsMet
Matching contribution as a percentage of poker revenue after the base is met			0.84%penn_DefinedContributionPlanEmployerContributionAsPercentageOfPokerRevenueAfterBaseIsMet
Number of plans for which matching contribution is made			2penn_DefinedContributionPlanNumberOfPlans
Contributions for the two plans at Hollywood Casino at Charles Town Races			3.0us-gaap_DefinedContributionPlanCostRecognized	3.6us-gaap_DefinedContributionPlanCostRecognized	3.9us-gaap_DefinedContributionPlanCostRecognized
Non-qualified deferred compensation plan
Vesting period for matching contribution by employer under the plan (in years)			5 years
Employer's matching contributions for the non-qualified deferred compensation plan			1.9penn_NonqualifiedDeferredCompensationArrangementWithIndividualEmployerContribution	2.3penn_NonqualifiedDeferredCompensationArrangementWithIndividualEmployerContribution	2.7penn_NonqualifiedDeferredCompensationArrangementWithIndividualEmployerContribution
Deferred compensation liability, which was included in other current liabilities		$ 61.4us-gaap_DeferredCompensationLiabilityCurrent	$ 61.4us-gaap_DeferredCompensationLiabilityCurrent	$ 53.7us-gaap_DeferredCompensationLiabilityCurrent
Total Number of Employees | Unionized Employees
Labor Agreements
Threshold number of employees under agreement for separate disclosure of unions			85penn_ThresholdNumberOfEmployeesUnderAgreementForSeparateDisclosureOfUnions / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_NumberOfEmployeesTotalMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_UnionizedEmployeesConcentrationRiskMember

X

- Definition

Represents the number of employees in the Hotel Employees and Restaurant Employees Union Local 1 with whom the agreements have been made.

+ References

No definition available.

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- Definition

Represents the number of employees in the Seafarers Entertainment and Allied Trade Union with whom the agreements have been made.

+ References

No definition available.

+ Details

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X

- Definition

Represents the period of ratification with respect to the agreements entered into with the Sports Arena Employees.

+ References

No definition available.

+ Details

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- Definition

Represents the number of employees in the United Steel Workers and with whom the agreements have been made.

+ References

No definition available.

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- Details

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- Definition

Represents the matching contribution for eligible employees as a percentage of the daily mutual handle.

+ References

No definition available.

+ Details

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X

- Definition

Represents the matching contribution for eligible employees as a percentage of net video lottery revenue up to a base.

+ References

No definition available.

+ Details

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- Definition

Represents the matching contribution for eligible employees as a percentage of poker revenue after the base is met.

+ References

No definition available.

+ Details

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- Definition

Represents the matching contribution for eligible employees as a percentage of table revenue after the base is met.

+ References

No definition available.

+ Details

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- Definition

Represents the number of plans for which matching contribution is made.

+ References

No definition available.

+ Details

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- Definition

Represents the term of Lease Term.

+ References

No definition available.

+ Details

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Balance Type:	na
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- Definition

Represents the employer's matching contributions for the non-qualified deferred compensation plan.

+ References

No definition available.

+ Details

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X

- Definition

Represents the threshold number of employees for separate disclosure of the unions representing employees.

+ References

No definition available.

+ Details

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- Definition

The amount of payment into the fund established for purposes of making future disbursements to the individual in accordance with the terms and understanding of the deferred compensation arrangement.

+ References

No definition available.

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- Definition

Minimum period the individual is required to perform services to be fully vested under the deferred compensation arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 710

-SubTopic 10

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- Definition

Aggregate carrying value as of the balance sheet date of the liabilities for all deferred compensation arrangements payable within one year (or the operating cycle, if longer). Represents currently earned compensation under compensation arrangements that is not actually paid until a later date.

+ References

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

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- Definition

The amount of the cost recognized during the period for defined contribution plans.

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-Publisher FASB

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- Definition

Percentage of employees' gross pay for which the employer contributes a matching contribution to a defined contribution plan.

+ References

No definition available.

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- Definition

Percentage employer matches of the employee's percentage contribution matched.

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No definition available.

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