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Related Party Transactions (Details) (USD $) | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Related party transactions |  |  |
Future minimum lease commitments relating to leases | $ 4,967,678,000 us-gaap_OperatingLeasesFutureMinimumPaymentsDue |  |
Affiliates of Entity Chairman |  |  |
Related party transactions |  |  |
Rent expense | 1,100,000 us-gaap_OperatingLeasesRentExpenseNet / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = penn_AffiliatesOfEntityChairmanMember | 1,100,000 us-gaap_OperatingLeasesRentExpenseNet / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = penn_AffiliatesOfEntityChairmanMember | 1,000,000 us-gaap_OperatingLeasesRentExpenseNet / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = penn_AffiliatesOfEntityChairmanMember
Future minimum lease commitments relating to leases | $ 5,200,000 us-gaap_OperatingLeasesFutureMinimumPaymentsDue / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = penn_AffiliatesOfEntityChairmanMember |  |

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- Definition Amount of required minimum rental payments for leases having an initial or remaining non-cancelable letter-terms in excess of one year. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6453985&loc=d3e41502-112717 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 10 -Section 55 -Paragraph 40 -Subparagraph (Note 3) -URI http://asc.fasb.org/extlink&oid=6584154&loc=d3e38371-112697 + Details
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- Definition Rental expense for the reporting period incurred under operating leases, including minimum and any contingent rent expense, net of related sublease income. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6453985&loc=d3e41499-112717 + Details
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Namespace Prefix: | us-gaap_
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Balance Type: | debit
Period Type: | duration

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- Details
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Namespace Prefix: | us-gaap_
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Balance Type: | na
Period Type: | duration

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- Details
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