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Summary of Significant Accounting Policies (Details 5) (USD $)
 0 Months Ended 12 Months Ended 3 Months Ended 0 Months Ended
Nov. 01, 2013
Option
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Nov. 01, 2014
Jul. 30, 2014
Rental expense related to the master lease                  
Term of lease renewal options 5 years                
Number of lease renewal options 4penn_LeaseRenewalOptionsNumber                
Total rental expense   $ 421,388,000us-gaap_LeaseAndRentalExpense $ 69,502,000us-gaap_LeaseAndRentalExpense            
Master Lease Agreement                  
Rental expense related to the master lease                  
Term of lease renewal options   5 years              
Number of lease renewal options   4penn_LeaseRenewalOptionsNumber
/ penn_OperatingLeasesByTypeAxis
= penn_MasterLeaseAgreementMember		              
Initial term of lease 15 years 15 years              
Total rental expense   421,400,000us-gaap_LeaseAndRentalExpense
/ penn_OperatingLeasesByTypeAxis
= penn_MasterLeaseAgreementMember		 69,500,000us-gaap_LeaseAndRentalExpense
/ penn_OperatingLeasesByTypeAxis
= penn_MasterLeaseAgreementMember		 107,800,000us-gaap_LeaseAndRentalExpense
/ penn_OperatingLeasesByTypeAxis
= penn_MasterLeaseAgreementMember		 104,600,000us-gaap_LeaseAndRentalExpense
/ penn_OperatingLeasesByTypeAxis
= penn_MasterLeaseAgreementMember		 104,600,000us-gaap_LeaseAndRentalExpense
/ penn_OperatingLeasesByTypeAxis
= penn_MasterLeaseAgreementMember		 104,300,000us-gaap_LeaseAndRentalExpense
/ penn_OperatingLeasesByTypeAxis
= penn_MasterLeaseAgreementMember		    
Master Lease Agreement | Facilities Held Under Leases                  
Rental expense related to the master lease                  
Number of real property assets associated with Company's gaming and related facilities   18penn_NumberOfRealEstatePropertyAssetsAssociatedWithGamingAndRelatedFacilitiesUnderLeases
/ penn_OperatingLeasesByTypeAxis
= penn_MasterLeaseAgreementMember
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= penn_FacilitiesHeldUnderLeasesMember		              
Percentage of escalation to fixed components of rent if certain rent coverage ratio thresholds are met 2.00%penn_OperatingLeasesPercentageOfEscalationIfCertainRentCoverageRatioThresholdsAreMet
/ penn_OperatingLeasesByTypeAxis
= penn_MasterLeaseAgreementMember
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= penn_FacilitiesHeldUnderLeasesMember		                
Term of lease renewal options 5 years                
Period over which operating lease component is adjusted 5 years 5 years              
Adjustment to operating lease component as percentage of the average change to net revenues during preceding five years 4.00%penn_OperatingLeaseComponentAdjustmentAsPercentageOfAverageChangeToNetRevenuesDuringPrecedingFiveYears
/ penn_OperatingLeasesByTypeAxis
= penn_MasterLeaseAgreementMember
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= penn_FacilitiesHeldUnderLeasesMember		 4.00%penn_OperatingLeaseComponentAdjustmentAsPercentageOfAverageChangeToNetRevenuesDuringPrecedingFiveYears
/ penn_OperatingLeasesByTypeAxis
= penn_MasterLeaseAgreementMember
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= penn_FacilitiesHeldUnderLeasesMember		              
Adjustment to operating lease component as percentage of the average change to net revenues during preceding month 20.00%penn_OperatingLeaseComponentAdjustmentAsPercentageOfAverageChangeToNetRevenuesDuringPrecedingMonth
/ penn_OperatingLeasesByTypeAxis
= penn_MasterLeaseAgreementMember
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= penn_FacilitiesHeldUnderLeasesMember		                
Increase in annual rental expense   19,000,000penn_IncreaseInAnnualRentalExpense
/ penn_OperatingLeasesByTypeAxis
= penn_MasterLeaseAgreementMember
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= penn_FacilitiesHeldUnderLeasesMember		              
Percentage of real estate construction costs paid for by GLPI to facilities   10.00%penn_RealEstateConstructionCostsPaidInPercentage
/ penn_OperatingLeasesByTypeAxis
= penn_MasterLeaseAgreementMember
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= penn_FacilitiesHeldUnderLeasesMember		              
Master Lease Agreement And Argosy Casino Sioux City Member                  
Rental expense related to the master lease                  
Increase in annual rental expense               3,200,000penn_IncreaseInAnnualRentalExpense
/ penn_OperatingLeasesByTypeAxis
= penn_MasterLeaseAgreementAndArgosyCasinoSiouxCityMember		  
Decrease in annual rent payable to GLPI                 $ 6,200,000us-gaap_AccruedRentCurrentAndNoncurrent
/ penn_OperatingLeasesByTypeAxis
= penn_MasterLeaseAgreementAndArgosyCasinoSiouxCityMember