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Derivative Instruments and Hedging Activities - Narrative (Details) (USD $)
0 Months Ended
Feb. 06, 2013
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Sep. 30, 2013
Derivatives, Fair Value [Line Items]          
Accumulated other comprehensive loss, before tax   $ 5,700,000us-gaap_AccumulatedOtherComprehensiveIncomeLossBeforeTax1 $ 1,189,000us-gaap_AccumulatedOtherComprehensiveIncomeLossBeforeTax1 $ 0us-gaap_AccumulatedOtherComprehensiveIncomeLossBeforeTax1  
Accumulated other comprehensive loss, net of tax   3,648,000us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax 799,000us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax    
Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges [Member]          
Derivatives, Fair Value [Line Items]          
Accumulated other comprehensive loss, before tax   5,700,000us-gaap_AccumulatedOtherComprehensiveIncomeLossBeforeTax1
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember
     
Accumulated other comprehensive loss, net of tax   3,600,000us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember
     
Successor [Member]          
Derivatives, Fair Value [Line Items]          
Expected to be reclassified from AOCL during next 12 months   5,800,000us-gaap_InterestRateCashFlowHedgeGainLossToBeReclassifiedDuringNext12MonthsNet
/ us-gaap_StatementScenarioAxis
= us-gaap_SuccessorMember
     
New Term Loan [Member] | LIBOR [Member] | Term Loan [Member]          
Derivatives, Fair Value [Line Items]          
Debt, variable rate floor 1.00%prx_DebtInstrumentVariableRateFloor
/ us-gaap_DebtInstrumentAxis
= prx_NewTermLoanMember
/ us-gaap_LongtermDebtTypeAxis
= prx_TermLoanMember
/ us-gaap_VariableRateAxis
= us-gaap_LondonInterbankOfferedRateLIBORMember
       
Interest Rate Cap [Member]          
Derivatives, Fair Value [Line Items]          
Number of outstanding interest rate caps   8us-gaap_NumberOfInterestRateDerivativesHeld
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateCapMember
     
Notional amount         $ 750,000,000invest_DerivativeNotionalAmount
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateCapMember
Fixed interest rate         1.00%us-gaap_DerivativeFixedInterestRate
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateCapMember
Weighted average fixed interest rate   4.80%prx_DerivativeWeightedAverageFixedInterestRate
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateCapMember
     
Percent of coverage   35.00%prx_DerivativePercentofCoverage
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateCapMember
     
Interest Rate Cap [Member] | New Term Loan [Member] | LIBOR [Member] | Term Loan [Member]          
Derivatives, Fair Value [Line Items]          
Debt, variable rate floor 1.00%prx_DebtInstrumentVariableRateFloor
/ us-gaap_DebtInstrumentAxis
= prx_NewTermLoanMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateCapMember
/ us-gaap_LongtermDebtTypeAxis
= prx_TermLoanMember
/ us-gaap_VariableRateAxis
= us-gaap_LondonInterbankOfferedRateLIBORMember