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Summary of Significant Accounting Policies (Details 6) (USD $)
 3 Months Ended 12 Months Ended
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Net income loss available to common stockholders                      
Net income $ (250,407,000)us-gaap_NetIncomeLoss $ 8,499,000us-gaap_NetIncomeLoss $ 4,176,000us-gaap_NetIncomeLoss $ 4,537,000us-gaap_NetIncomeLoss $ (888,747,000)us-gaap_NetIncomeLoss $ 41,317,000us-gaap_NetIncomeLoss $ (12,180,000)us-gaap_NetIncomeLoss $ 65,271,000us-gaap_NetIncomeLoss $ (233,195,000)us-gaap_NetIncomeLoss $ (794,339,000)us-gaap_NetIncomeLoss $ 211,971,000us-gaap_NetIncomeLoss
Net income applicable to preferred stock                     41,023,000us-gaap_PreferredStockDividendsAndOtherAdjustments
Net income applicable to common stock                 (233,195,000)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic (794,339,000)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic 170,948,000us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
Determination of shares:                      
Weighted-average common shares outstanding (in shares)                 78,425,000us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 78,111,000us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 76,345,000us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Assumed conversion of dilutive employee stock-based awards (in shares)                     2,305,000us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements
Assumed conversion of restricted stock (in shares)                     159,000penn_IncrementalCommonSharesAttributableToConversionOfRestrictedStock
Assumed conversion of preferred stock (in shares)                     24,995,000us-gaap_IncrementalCommonSharesAttributableToConversionOfPreferredStock
Diluted weighted-average common shares outstanding (in shares)                     103,804,000us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
Anti-dilutive securities, options to purchase shares outstanding                 6,633,622us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount 7,316,713us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount 1,693,500us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
Calculation of basic EPS:                      
Net (loss) income applicable to common stock                 (233,195,000)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic (794,339,000)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic 170,948,000us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
Weighted-average common shares outstanding (in shares)                 78,425,000us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 78,111,000us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 76,345,000us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Basic (loss) earnings per common share $ (3.18)us-gaap_EarningsPerShareBasic $ 0.10us-gaap_EarningsPerShareBasic $ 0.05us-gaap_EarningsPerShareBasic $ 0.05us-gaap_EarningsPerShareBasic $ (11.40)us-gaap_EarningsPerShareBasic $ 0.43us-gaap_EarningsPerShareBasic $ (0.16)us-gaap_EarningsPerShareBasic $ 0.68us-gaap_EarningsPerShareBasic $ (2.97)us-gaap_EarningsPerShareBasic $ (10.17)us-gaap_EarningsPerShareBasic $ 2.24us-gaap_EarningsPerShareBasic
Basic and Diluted EPS                 $ (2.97)us-gaap_EarningsPerShareBasicAndDiluted $ (10.17)us-gaap_EarningsPerShareBasicAndDiluted  
Calculation of diluted EPS using if-converted method:                      
Net (loss) income (250,407,000)us-gaap_NetIncomeLoss 8,499,000us-gaap_NetIncomeLoss 4,176,000us-gaap_NetIncomeLoss 4,537,000us-gaap_NetIncomeLoss (888,747,000)us-gaap_NetIncomeLoss 41,317,000us-gaap_NetIncomeLoss (12,180,000)us-gaap_NetIncomeLoss 65,271,000us-gaap_NetIncomeLoss (233,195,000)us-gaap_NetIncomeLoss (794,339,000)us-gaap_NetIncomeLoss 211,971,000us-gaap_NetIncomeLoss
Diluted weighted-average common shares outstanding                     103,804,000us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
Diluted (loss) earnings per common share $ (3.18)us-gaap_EarningsPerShareDiluted $ 0.10us-gaap_EarningsPerShareDiluted $ 0.05us-gaap_EarningsPerShareDiluted $ 0.05us-gaap_EarningsPerShareDiluted $ (11.40)us-gaap_EarningsPerShareDiluted $ 0.40us-gaap_EarningsPerShareDiluted $ (0.16)us-gaap_EarningsPerShareDiluted $ 0.63us-gaap_EarningsPerShareDiluted $ (2.97)us-gaap_EarningsPerShareDiluted $ (10.17)us-gaap_EarningsPerShareDiluted $ 2.04us-gaap_EarningsPerShareDiluted
Series C Preferred Stock                      
Earnings Per Share                      
Preferred stock , shares outstanding 8,624us-gaap_PreferredStockSharesOutstanding
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesCPreferredStockMember		       8,624us-gaap_PreferredStockSharesOutstanding
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesCPreferredStockMember		       8,624us-gaap_PreferredStockSharesOutstanding
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesCPreferredStockMember		 8,624us-gaap_PreferredStockSharesOutstanding
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesCPreferredStockMember		  
Series B Preferred Stock                      
Earnings Per Share                      
Preferred stock , shares outstanding                     12,275us-gaap_PreferredStockSharesOutstanding
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesBPreferredStockMember
Series B Preferred Stock | Common stock price less than $45                      
Determination of shares:                      
Common stock price (in dollars per share) $ 45us-gaap_SharePrice
/ us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis
= penn_DilutedWeightedAverageCommonSharesAdjustmentIfCommonStockPriceLessThan45DollarsMember
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesBPreferredStockMember		               $ 45us-gaap_SharePrice
/ us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis
= penn_DilutedWeightedAverageCommonSharesAdjustmentIfCommonStockPriceLessThan45DollarsMember
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesBPreferredStockMember		    
Increase in diluted weighted-average common shares outstanding                 26,777,778penn_WeightedAverageNumberOfDilutedSharesOutstandingIncrease
/ us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis
= penn_DilutedWeightedAverageCommonSharesAdjustmentIfCommonStockPriceLessThan45DollarsMember
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesBPreferredStockMember		    
Series B Preferred Stock | Common stock price between $45 and $67                      
Determination of shares:                      
Aggregate liquidation preference of preferred stock $ 1,205,000,000us-gaap_PreferredStockRedemptionAmount
/ us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis
= penn_DilutedWeightedAverageCommonSharesAdjustmentIfCommonStockPriceBetween45And67DollarsMember
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesBPreferredStockMember		               $ 1,205,000,000us-gaap_PreferredStockRedemptionAmount
/ us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis
= penn_DilutedWeightedAverageCommonSharesAdjustmentIfCommonStockPriceBetween45And67DollarsMember
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesBPreferredStockMember		    
Series B Preferred Stock | Common stock price between $45 and $67 | Minimum                      
Determination of shares:                      
Common stock price (in dollars per share) $ 45us-gaap_SharePrice
/ us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis
= penn_DilutedWeightedAverageCommonSharesAdjustmentIfCommonStockPriceBetween45And67DollarsMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesBPreferredStockMember		               $ 45us-gaap_SharePrice
/ us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis
= penn_DilutedWeightedAverageCommonSharesAdjustmentIfCommonStockPriceBetween45And67DollarsMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesBPreferredStockMember		    
Increase in diluted weighted-average common shares outstanding                 17,985,075penn_WeightedAverageNumberOfDilutedSharesOutstandingIncrease
/ us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis
= penn_DilutedWeightedAverageCommonSharesAdjustmentIfCommonStockPriceBetween45And67DollarsMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesBPreferredStockMember		    
Series B Preferred Stock | Common stock price between $45 and $67 | Maximum                      
Determination of shares:                      
Common stock price (in dollars per share) $ 67us-gaap_SharePrice
/ us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis
= penn_DilutedWeightedAverageCommonSharesAdjustmentIfCommonStockPriceBetween45And67DollarsMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesBPreferredStockMember		               $ 67us-gaap_SharePrice
/ us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis
= penn_DilutedWeightedAverageCommonSharesAdjustmentIfCommonStockPriceBetween45And67DollarsMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesBPreferredStockMember		    
Increase in diluted weighted-average common shares outstanding                 26,777,778penn_WeightedAverageNumberOfDilutedSharesOutstandingIncrease
/ us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis
= penn_DilutedWeightedAverageCommonSharesAdjustmentIfCommonStockPriceBetween45And67DollarsMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesBPreferredStockMember		    
Series B Preferred Stock | Common stock price more than $67                      
Determination of shares:                      
Common stock price (in dollars per share) $ 67us-gaap_SharePrice
/ us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis
= penn_DilutedWeightedAverageCommonSharesAdjustmentIfCommonStockPriceMoreThan67DollarsMember
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesBPreferredStockMember		               $ 67us-gaap_SharePrice
/ us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis
= penn_DilutedWeightedAverageCommonSharesAdjustmentIfCommonStockPriceMoreThan67DollarsMember
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesBPreferredStockMember		    
Increase in diluted weighted-average common shares outstanding                 17,985,075penn_WeightedAverageNumberOfDilutedSharesOutstandingIncrease
/ us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis
= penn_DilutedWeightedAverageCommonSharesAdjustmentIfCommonStockPriceMoreThan67DollarsMember
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesBPreferredStockMember