Summary of Significant Accounting Policies (Details) - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2015	Mar. 31, 2014
Revenue recognition
Promotional allowances	$ 37,888	$ 36,931
Cost of complimentary services	12,601	12,690
Gaming and Racing Taxes
Gaming expense	227,000	216,700
Rooms
Revenue recognition
Promotional allowances	8,336	8,071
Cost of complimentary services	936	872
Food and Beverage
Revenue recognition
Promotional allowances	27,448	26,598
Cost of complimentary services	10,833	10,975
Other
Revenue recognition
Promotional allowances	2,104	2,262
Cost of complimentary services	$ 832	$ 843

Represents the estimated cost of providing complimentary services during the period.

No definition available.

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

- References

No definition available.

+ Details

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

- Definition

This element represents gaming taxes, pari-mutuel taxes and purse expense.

+ References

No definition available.

+ Details

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

- Definition

This element represents the estimated retail value of accommodations, food and beverage, and other services furnished to guests without charge.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 924
-SubTopic 605
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6472957&loc=d3e51325-107943

+ Details

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Balance Type:	debit
Period Type:	duration

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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- Details

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Namespace Prefix:
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- Details

Name:	us-gaap_ProductOrServiceAxis=penn_FoodAndBeverageMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_ProductOrServiceAxis=penn_OtherServicesMember
Namespace Prefix:
Data Type:	na
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