Annual report pursuant to Section 13 and 15(d)

Commitments and Contingencies (Details)

v2.4.1.9
Commitments and Contingencies (Details) (USD $)
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Aug. 31, 2013
Long-term Purchase Commitment [Line Items]      
Contingent Consideration, Future Minimum Payments Due $ 26,542,000pdii_ContingentConsiderationFutureMinimumPaymentsDue    
Contingent Consideration, Due in Next Twelve Months 633,000pdii_ContingentConsiderationDueinNextTwelveMonths    
Contingent Consideration, Future Minimum Payments, Due in Two and Three Years 2,435,000pdii_ContingentConsiderationFutureMinimumPaymentsDueinTwoandThreeYears    
Contingent Consideration, Future Minimum Payments. Due in Four and Five Years 14,683,000pdii_ContingentConsiderationFutureMinimumPayments.DueinFourandFiveYears    
Contingent Consideration, Due after Fifth Year 8,791,000pdii_ContingentConsiderationDueafterFifthYear    
Operating Leases, Rent Expense 5,800,000us-gaap_LeaseAndRentalExpense 4,900,000us-gaap_LeaseAndRentalExpense  
Equipment Expense 5,200,000us-gaap_EquipmentExpense 4,100,000us-gaap_EquipmentExpense  
Purchase Obligation, Fiscal Year Maturity [Abstract]      
Contractual obligations 330,000us-gaap_PurchaseObligation [1]    
Contractual obligations, Due in Next Twelve Months 284,000us-gaap_PurchaseObligationDueInNextTwelveMonths [1]    
Contractual obligations, Due in Second and Third Year 46,000us-gaap_PurchaseObligationDueInSecondAndThirdYear [1]    
Contractual obligations, Due in Fourth and Fifth Year 0us-gaap_PurchaseObligationDueInFourthAndFifthYear [1]    
Minimum lease payments, Future Minimum Payments Due 6,107,000us-gaap_OperatingLeasesFutureMinimumPaymentsDue    
Minimum lease payments, Future Minimum Payments Due, Next Twelve Months 4,114,000us-gaap_OperatingLeasesFutureMinimumPaymentsDueCurrent    
Minimum lease payments, Future Minimum Payments, Due in Two and Three Years 1,993,000us-gaap_OperatingLeasesFutureMinimumPaymentsDueInTwoAndThreeYears    
Minimum lease payments, Future Minimum Payments, Due in Four and Five Years 0us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFourAndFiveYears    
Less minimum sublease rentals, Future Minimum Payments Due, Future Minimum Sublease Rentals (3,222,000)us-gaap_OperatingLeasesFutureMinimumPaymentsDueFutureMinimumSubleaseRentals [2]    
Less minimum sublease rentals Future Minimum Payments Due Future Minimum Sublease Rentals For Next Twelve Months (2,469,000)pdii_OperatingLeasesFutureMinimumPaymentsDueFutureMinimumSubleaseRentalsForNextTwelveMonths [2]    
Less minimum sublease rentals Future Minimum Payments Due Future Minimum Sublease Rentals For Years Two and Three [Line Items] (753,000)pdii_OperatingLeasesFutureMinimumPaymentsDueFutureMinimumSubleaseRentalsForYearTwoAndThree [2]    
Less minimum sublease rentals Future Minimum Payments Due Future Minimum Sublease Rentals For Years Four and Five 0pdii_OperatingLeasesFutureMinimumPaymentsDueFutureMinimumSubleaseRentalsForYearsFourAndFive [2]    
Net minimum lease payments Future Minimum Payments Due Net 2,885,000pdii_OperatingLeasesFutureMinimumPaymentsDueNet    
Net minimum lease payments Future Minimum Payments Due Net In Next Twelve Months 1,645,000pdii_OperatingLeasesFutureMinimumPaymentsDueNetInNextTwelveMonths    
Net minimum lease payments Future Minimum Payments Due Net In Second And Third Year 1,240,000pdii_OperatingLeasesFutureMinimumPaymentsDueNetInSecondAndThirdYear    
Net minimum lease payments Future Minimum Payments Due Net In Fourth And Fifth Year 0pdii_OperatingLeasesFutureMinimumPaymentsDueNetInFourthAndFifthYear    
Total Contractual Obligation 29,757,000us-gaap_ContractualObligation    
Total Contractual Obligation, Due in Next Twelve Months 2,562,000us-gaap_ContractualObligationDueInNextTwelveMonths    
Total Contractual Obligation, Due in Second and Third Year 3,721,000us-gaap_ContractualObligationDueInSecondAndThirdYear    
Total Contractual Obligation, Due in Fourth and Fifth Year 14,683,000us-gaap_ContractualObligationDueInFourthAndFifthYear    
Letters of Credit Outstanding, Amount 1,400,000us-gaap_LettersOfCreditOutstandingAmount 2,000,000us-gaap_LettersOfCreditOutstandingAmount  
Contingent consideration, liability 26,542,000us-gaap_BusinessCombinationContingentConsiderationLiability   500,000us-gaap_BusinessCombinationContingentConsiderationLiability
Litigation Settlement, Amount 3,000,000us-gaap_LitigationSettlementAmount    
Settlement Liabilities, Current 500,000us-gaap_SettlementLiabilitiesCurrent    
Regulatory Liability, Noncurrent 2,500,000us-gaap_RegulatoryLiabilityNoncurrent    
Contractual Obligation, Due after Fifth Year 8,791,000us-gaap_ContractualObligationDueAfterFifthYear    
NEW JERSEY      
Purchase Obligation, Fiscal Year Maturity [Abstract]      
Operating Leases, Rent Expense, Sublease Rentals 1,900,000pdii_OperatingLeasesRentalIncomeExpectedLeaseIncome
/ us-gaap_StatementGeographicalAxis
= stpr_NJ 		   
PENNSYLVANIA      
Purchase Obligation, Fiscal Year Maturity [Abstract]      
Operating Leases, Rent Expense, Sublease Rentals 1,300,000pdii_OperatingLeasesRentalIncomeExpectedLeaseIncome
/ us-gaap_StatementGeographicalAxis
= stpr_PA 		   
ILLINOIS      
Purchase Obligation, Fiscal Year Maturity [Abstract]      
Operating Leases, Rent Expense, Sublease Rentals $ 18,000pdii_OperatingLeasesRentalIncomeExpectedLeaseIncome
/ us-gaap_StatementGeographicalAxis
= stpr_IL 		   
[1] Amounts represent contractual obligations related to software license contracts, office equipment and contracts for software systems.
[2] As of December 31, 2014, the Company has entered into various sublease agreements for all of the office space at the Saddle River, New Jersey facility, the Dresher, Pennsylvania facility, and the Schaumburg, Illinois facility. These subleases will provide aggregated lease income of approximately $1.9 million, $1.3 million and $18,000, respectively, over the remaining lease periods.