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Goodwill and Other Intangible Assets (Goodwill) (Details) (USD $)
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Goodwill [Line Items]    
Goodwill $ 15,545,000us-gaap_Goodwill $ 0us-gaap_Goodwill
Disposal Group, Including Discontinued Operation, Gross Profit (Loss) (1,200,000)us-gaap_DisposalGroupIncludingDiscontinuedOperationGrossProfitLoss  
Group DCA [Member]    
Goodwill [Line Items]    
Goodwill 2,500,000us-gaap_Goodwill
/ us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis
= pdii_GroupDCAMember		  
RedPath    
Goodwill [Line Items]    
Goodwill 15,545,000us-gaap_Goodwill
/ us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis
= pdii_RedPathMember		  
Group DCA [Member]    
Goodwill [Line Items]    
Goodwill $ 1,300,000us-gaap_Goodwill
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= pdii_GroupDCAMember