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Quarterly Financial Data (Unaudited) (Narrative) (Detail) (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
Effect of Fourth Quarter Events [Line Items]                      
Prior Period Reclassification Adjustment       $ 9,100,000us-gaap_PriorPeriodReclassificationAdjustment $ 7,500,000us-gaap_PriorPeriodReclassificationAdjustment $ 2,900,000us-gaap_PriorPeriodReclassificationAdjustment $ 4,900,000us-gaap_PriorPeriodReclassificationAdjustment $ 3,700,000us-gaap_PriorPeriodReclassificationAdjustment      
Revenues 117,075,000us-gaap_Revenues 164,594,000us-gaap_Revenues 162,752,000us-gaap_Revenues 136,804,000us-gaap_Revenues 111,967,000us-gaap_Revenues 100,178,000us-gaap_Revenues 148,520,000us-gaap_Revenues 95,595,000us-gaap_Revenues 581,225,000us-gaap_Revenues 456,260,000us-gaap_Revenues 380,880,000us-gaap_Revenues
Net income 55,071,000us-gaap_NetIncomeLoss 102,235,000us-gaap_NetIncomeLoss 92,055,000us-gaap_NetIncomeLoss 72,883,000us-gaap_NetIncomeLoss 61,092,000us-gaap_NetIncomeLoss 56,225,000us-gaap_NetIncomeLoss 93,742,000us-gaap_NetIncomeLoss 53,471,000us-gaap_NetIncomeLoss 322,244,000us-gaap_NetIncomeLoss 264,530,000us-gaap_NetIncomeLoss 211,669,000us-gaap_NetIncomeLoss
Net income per basic share (in Dollars per Share) $ 0.34us-gaap_EarningsPerShareBasic $ 0.64us-gaap_EarningsPerShareBasic $ 0.57us-gaap_EarningsPerShareBasic $ 0.48us-gaap_EarningsPerShareBasic $ 0.44us-gaap_EarningsPerShareBasic $ 0.40us-gaap_EarningsPerShareBasic $ 0.67us-gaap_EarningsPerShareBasic $ 0.38us-gaap_EarningsPerShareBasic $ 2.04us-gaap_EarningsPerShareBasic $ 1.89us-gaap_EarningsPerShareBasic $ 1.52us-gaap_EarningsPerShareBasic
Net income per diluted share (in Dollars per Share) $ 0.32us-gaap_EarningsPerShareDiluted $ 0.61us-gaap_EarningsPerShareDiluted $ 0.52us-gaap_EarningsPerShareDiluted $ 0.44us-gaap_EarningsPerShareDiluted $ 0.39us-gaap_EarningsPerShareDiluted $ 0.36us-gaap_EarningsPerShareDiluted $ 0.62us-gaap_EarningsPerShareDiluted $ 0.36us-gaap_EarningsPerShareDiluted $ 1.86us-gaap_EarningsPerShareDiluted $ 1.66us-gaap_EarningsPerShareDiluted $ 1.45us-gaap_EarningsPerShareDiluted
total revenues [Member]                      
Effect of Fourth Quarter Events [Line Items]                      
Quantifying Misstatement in Current Year Financial Statements, Amount                 1,700,000us-gaap_QuantifyingMisstatementInCurrentYearFinancialStatementsAmount
/ us-gaap_ErrorCorrectionsAndPriorPeriodAdjustmentsRestatementByRestatementPeriodAndAmountAxis
= pdli_TotalrevenuesMember		    
Operating Income (Loss) [Member]                      
Effect of Fourth Quarter Events [Line Items]                      
Quantifying Misstatement in Current Year Financial Statements, Amount                 12,800,000us-gaap_QuantifyingMisstatementInCurrentYearFinancialStatementsAmount
/ us-gaap_ErrorCorrectionsAndPriorPeriodAdjustmentsRestatementByRestatementPeriodAndAmountAxis
= us-gaap_OperatingIncomeLossMember		    
Net income line item [Member]                      
Effect of Fourth Quarter Events [Line Items]                      
Quantifying Misstatement in Current Year Financial Statements, Amount                 $ 8,100,000us-gaap_QuantifyingMisstatementInCurrentYearFinancialStatementsAmount
/ us-gaap_ErrorCorrectionsAndPriorPeriodAdjustmentsRestatementByRestatementPeriodAndAmountAxis
= pdli_NetincomelineitemMember