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Debt - Narrative (Details) (USD $)
3 Months Ended 12 Months Ended 9 Months Ended 3 Months Ended 0 Months Ended 1 Months Ended 0 Months Ended
Dec. 31, 2012
Dec. 31, 2014
Dec. 31, 2013
Sep. 28, 2012
Mar. 31, 2014
Sep. 28, 2012
Feb. 06, 2013
Feb. 28, 2013
Feb. 20, 2014
Debt Instrument [Line Items]                  
Long-term debt   $ 1,925,837,000us-gaap_LongTermDebt              
Successor [Member]                  
Debt Instrument [Line Items]                  
Interest expense 25,985,000us-gaap_InterestExpense
/ us-gaap_StatementScenarioAxis
= us-gaap_SuccessorMember
108,427,000us-gaap_InterestExpense
/ us-gaap_StatementScenarioAxis
= us-gaap_SuccessorMember
95,484,000us-gaap_InterestExpense
/ us-gaap_StatementScenarioAxis
= us-gaap_SuccessorMember
           
Long-term debt   1,925,837,000us-gaap_LongTermDebt
/ us-gaap_StatementScenarioAxis
= us-gaap_SuccessorMember
1,545,340,000us-gaap_LongTermDebt
/ us-gaap_StatementScenarioAxis
= us-gaap_SuccessorMember
           
Predecessor [Member]                  
Debt Instrument [Line Items]                  
Interest expense       9,159,000us-gaap_InterestExpense
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
         
Par Sterile [Member]                  
Debt Instrument [Line Items]                  
Transaction costs                 12,350,000us-gaap_BusinessAcquisitionCostOfAcquiredEntityTransactionCosts
/ us-gaap_BusinessAcquisitionAxis
= prx_ParSterileMember
Write off of deferred debt issuance cost         4,000,000us-gaap_WriteOffOfDeferredDebtIssuanceCost
/ us-gaap_BusinessAcquisitionAxis
= prx_ParSterileMember
       
Par Sterile [Member] | Other Noncurrent Assets [Member]                  
Debt Instrument [Line Items]                  
Transaction costs                 4,100,000us-gaap_BusinessAcquisitionCostOfAcquiredEntityTransactionCosts
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_OtherNoncurrentAssetsMember
/ us-gaap_BusinessAcquisitionAxis
= prx_ParSterileMember
Par Sterile [Member] | Selling, General and Administrative Expenses [Member]                  
Debt Instrument [Line Items]                  
Transaction costs   8,200,000us-gaap_BusinessAcquisitionCostOfAcquiredEntityTransactionCosts
/ us-gaap_BusinessAcquisitionAxis
= prx_ParSterileMember
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_SellingGeneralAndAdministrativeExpensesMember
            8,200,000us-gaap_BusinessAcquisitionCostOfAcquiredEntityTransactionCosts
/ us-gaap_BusinessAcquisitionAxis
= prx_ParSterileMember
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_SellingGeneralAndAdministrativeExpensesMember
7 Year Senior Secured Term Loan Facility [Member] | Term Loan [Member]                  
Debt Instrument [Line Items]                  
Debt term (years)           7 years      
Senior secured term loan       1,055,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= prx_SevenYearSeniorSecuredTermLoanFacilityMember
/ us-gaap_LongtermDebtTypeAxis
= prx_TermLoanMember
  1,055,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= prx_SevenYearSeniorSecuredTermLoanFacilityMember
/ us-gaap_LongtermDebtTypeAxis
= prx_TermLoanMember
     
7 Year Senior Secured Term Loan Facility [Member] | Term Loan [Member] | Successor [Member]                  
Debt Instrument [Line Items]                  
Long-term debt   1,435,837,000us-gaap_LongTermDebt
/ us-gaap_DebtInstrumentAxis
= prx_SevenYearSeniorSecuredTermLoanFacilityMember
/ us-gaap_LongtermDebtTypeAxis
= prx_TermLoanMember
/ us-gaap_StatementScenarioAxis
= us-gaap_SuccessorMember
1,055,340,000us-gaap_LongTermDebt
/ us-gaap_DebtInstrumentAxis
= prx_SevenYearSeniorSecuredTermLoanFacilityMember
/ us-gaap_LongtermDebtTypeAxis
= prx_TermLoanMember
/ us-gaap_StatementScenarioAxis
= us-gaap_SuccessorMember
           
7 Year Senior Secured Term Loan Facility [Member] | Term Loan [Member] | Successor [Member] | Fair Value, Measurements, Recurring [Member]                  
Debt Instrument [Line Items]                  
Debt, fair value   1,399,941,000us-gaap_DebtInstrumentFairValue
/ us-gaap_DebtInstrumentAxis
= prx_SevenYearSeniorSecuredTermLoanFacilityMember
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
/ us-gaap_LongtermDebtTypeAxis
= prx_TermLoanMember
/ us-gaap_StatementScenarioAxis
= us-gaap_SuccessorMember
1,063,255,000us-gaap_DebtInstrumentFairValue
/ us-gaap_DebtInstrumentAxis
= prx_SevenYearSeniorSecuredTermLoanFacilityMember
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
/ us-gaap_LongtermDebtTypeAxis
= prx_TermLoanMember
/ us-gaap_StatementScenarioAxis
= us-gaap_SuccessorMember
           
7 Year Senior Secured Term Loan Facility [Member] | Term Loan [Member] | Successor [Member] | Fair Value, Measurements, Recurring [Member] | Level 2 [Member]                  
Debt Instrument [Line Items]                  
Debt, fair value   1,399,941,000us-gaap_DebtInstrumentFairValue
/ us-gaap_DebtInstrumentAxis
= prx_SevenYearSeniorSecuredTermLoanFacilityMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
/ us-gaap_LongtermDebtTypeAxis
= prx_TermLoanMember
/ us-gaap_StatementScenarioAxis
= us-gaap_SuccessorMember
1,063,255,000us-gaap_DebtInstrumentFairValue
/ us-gaap_DebtInstrumentAxis
= prx_SevenYearSeniorSecuredTermLoanFacilityMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
/ us-gaap_LongtermDebtTypeAxis
= prx_TermLoanMember
/ us-gaap_StatementScenarioAxis
= us-gaap_SuccessorMember
           
5 Year Senior Secured Revolving Credit Facility [Member] | Revolving Credit Facility [Member]                  
Debt Instrument [Line Items]                  
Debt term (years)           5 years      
Line of credit, maximum borrowing capacity       150,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_DebtInstrumentAxis
= prx_FiveYearSeniorSecuredRevolvingCreditFacilityMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_RevolvingCreditFacilityMember
  150,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_DebtInstrumentAxis
= prx_FiveYearSeniorSecuredRevolvingCreditFacilityMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_RevolvingCreditFacilityMember
     
5 Year Senior Secured Revolving Credit Facility [Member] | Revolving Credit Facility [Member] | Successor [Member]                  
Debt Instrument [Line Items]                  
Long-term debt   0us-gaap_LongTermDebt
/ us-gaap_DebtInstrumentAxis
= prx_FiveYearSeniorSecuredRevolvingCreditFacilityMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_RevolvingCreditFacilityMember
/ us-gaap_StatementScenarioAxis
= us-gaap_SuccessorMember
0us-gaap_LongTermDebt
/ us-gaap_DebtInstrumentAxis
= prx_FiveYearSeniorSecuredRevolvingCreditFacilityMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_RevolvingCreditFacilityMember
/ us-gaap_StatementScenarioAxis
= us-gaap_SuccessorMember
           
Credit Agreement [Member] | Term Loan and Revolving Credit Facility [Member]                  
Debt Instrument [Line Items]                  
Line of credit, accordion feature, additional borrowing capacity available       250,000,000prx_LineOfCreditFacilityAccordionFeatureAdditionalBorrowingCapacityAvailable
/ us-gaap_DebtInstrumentAxis
= prx_CreditAgreementMember
/ us-gaap_LongtermDebtTypeAxis
= prx_TermLoanAndRevolvingCreditFacilityMember
  250,000,000prx_LineOfCreditFacilityAccordionFeatureAdditionalBorrowingCapacityAvailable
/ us-gaap_DebtInstrumentAxis
= prx_CreditAgreementMember
/ us-gaap_LongtermDebtTypeAxis
= prx_TermLoanAndRevolvingCreditFacilityMember
     
Ratio of amount outstanding to EBITDA required to make mandatory principle payments   2.50prx_DebtInstrumentCovenantDescriptionRatioofAmountOutstandingtoEBITDARequiredtoMakeMandatoryPrinciplePayments
/ us-gaap_DebtInstrumentAxis
= prx_CreditAgreementMember
/ us-gaap_LongtermDebtTypeAxis
= prx_TermLoanAndRevolvingCreditFacilityMember
             
Percent to be paid when ratio is greater than 2.50 but less than or equal to 3.00   25.00%prx_DebtInstrumentCovenantDescriptionPercentofExcessCashFlowstobePaidwhenRatioisGreaterThan2.50butLessThanorEqualto3.00
/ us-gaap_DebtInstrumentAxis
= prx_CreditAgreementMember
/ us-gaap_LongtermDebtTypeAxis
= prx_TermLoanAndRevolvingCreditFacilityMember
             
Percent to be paid when ratio is greater than 3.00   50.00%prx_DebtInstrumentCovenantDescriptionPercentofExcessCashFlowstobePaidwhenRatioisGreaterThan3.00
/ us-gaap_DebtInstrumentAxis
= prx_CreditAgreementMember
/ us-gaap_LongtermDebtTypeAxis
= prx_TermLoanAndRevolvingCreditFacilityMember
             
Principal prepayment due in first quarter of 2014     10,800,000us-gaap_DebtInstrumentPeriodicPaymentPrincipal
/ us-gaap_DebtInstrumentAxis
= prx_CreditAgreementMember
/ us-gaap_LongtermDebtTypeAxis
= prx_TermLoanAndRevolvingCreditFacilityMember
  5,000,000us-gaap_DebtInstrumentPeriodicPaymentPrincipal
/ us-gaap_DebtInstrumentAxis
= prx_CreditAgreementMember
/ us-gaap_LongtermDebtTypeAxis
= prx_TermLoanAndRevolvingCreditFacilityMember
       
Credit Agreement [Member] | Term Loan and Revolving Credit Facility [Member] | Minimum [Member] | Ratio is Greater than 2.5 but Less Than or Equal to 3, Required to Pay 25% of Excess cash Flows [Member]                  
Debt Instrument [Line Items]                  
Ratio of Indebtedness to Net Capital   2.50us-gaap_RatioOfIndebtednessToNetCapital1
/ prx_DebtCovenantAgreementAxis
= prx_RatioisGreaterthanTwoandHalfbutLessThanorEqualtoThreeRequiredtoPayTwentyfivePercentofExcesscashFlowsMember
/ us-gaap_DebtInstrumentAxis
= prx_CreditAgreementMember
/ us-gaap_LongtermDebtTypeAxis
= prx_TermLoanAndRevolvingCreditFacilityMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
             
Credit Agreement [Member] | Term Loan and Revolving Credit Facility [Member] | Minimum [Member] | Ratio is Greater than 3, Required to Pay 50% of Excess cash Flows [Member]                  
Debt Instrument [Line Items]                  
Ratio of Indebtedness to Net Capital   3.00us-gaap_RatioOfIndebtednessToNetCapital1
/ prx_DebtCovenantAgreementAxis
= prx_RatioisGreaterthanThreeRequiredtoPayFiftyPercentofExcesscashFlowsMember
/ us-gaap_DebtInstrumentAxis
= prx_CreditAgreementMember
/ us-gaap_LongtermDebtTypeAxis
= prx_TermLoanAndRevolvingCreditFacilityMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
             
Credit Agreement [Member] | Term Loan and Revolving Credit Facility [Member] | Maximum [Member] | Ratio is Greater than 2.5 but Less Than or Equal to 3, Required to Pay 25% of Excess cash Flows [Member]                  
Debt Instrument [Line Items]                  
Ratio of Indebtedness to Net Capital   3.00us-gaap_RatioOfIndebtednessToNetCapital1
/ prx_DebtCovenantAgreementAxis
= prx_RatioisGreaterthanTwoandHalfbutLessThanorEqualtoThreeRequiredtoPayTwentyfivePercentofExcesscashFlowsMember
/ us-gaap_DebtInstrumentAxis
= prx_CreditAgreementMember
/ us-gaap_LongtermDebtTypeAxis
= prx_TermLoanAndRevolvingCreditFacilityMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
             
New Term Loan [Member] | Term Loan [Member]                  
Debt Instrument [Line Items]                  
Senior secured term loan             1,066,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= prx_NewTermLoanMember
/ us-gaap_LongtermDebtTypeAxis
= prx_TermLoanMember
   
Call option premium percentage             1.00%prx_DebtInstrumentCallOptionPremiumPercentage
/ us-gaap_DebtInstrumentAxis
= prx_NewTermLoanMember
/ us-gaap_LongtermDebtTypeAxis
= prx_TermLoanMember
1.00%prx_DebtInstrumentCallOptionPremiumPercentage
/ us-gaap_DebtInstrumentAxis
= prx_NewTermLoanMember
/ us-gaap_LongtermDebtTypeAxis
= prx_TermLoanMember
 
Payments for debt call option premium               10,500,000prx_PaymentsForDebtCallOptionPremium
/ us-gaap_DebtInstrumentAxis
= prx_NewTermLoanMember
/ us-gaap_LongtermDebtTypeAxis
= prx_TermLoanMember
 
New Term Loan [Member] | Term Loan [Member] | Gain (Loss) on Extinguishment of Debt [Member]                  
Debt Instrument [Line Items]                  
Write off of deferred debt issuance cost               5,900,000us-gaap_WriteOffOfDeferredDebtIssuanceCost
/ us-gaap_DebtInstrumentAxis
= prx_NewTermLoanMember
/ us-gaap_IncomeStatementLocationAxis
= prx_GainLossonExtinguishmentofDebtMember
/ us-gaap_LongtermDebtTypeAxis
= prx_TermLoanMember
 
Write off of debt call option premium               1,400,000prx_WriteoffofDebtCallOptionPremium
/ us-gaap_DebtInstrumentAxis
= prx_NewTermLoanMember
/ us-gaap_IncomeStatementLocationAxis
= prx_GainLossonExtinguishmentofDebtMember
/ us-gaap_LongtermDebtTypeAxis
= prx_TermLoanMember
 
New Term Loan [Member] | Term Loan [Member] | LIBOR [Member]                  
Debt Instrument [Line Items]                  
Debt, basis spread on variable rate             3.25%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_DebtInstrumentAxis
= prx_NewTermLoanMember
/ us-gaap_LongtermDebtTypeAxis
= prx_TermLoanMember
/ us-gaap_VariableRateAxis
= us-gaap_LondonInterbankOfferedRateLIBORMember
   
Debt, variable rate floor             1.00%prx_DebtInstrumentVariableRateFloor
/ us-gaap_DebtInstrumentAxis
= prx_NewTermLoanMember
/ us-gaap_LongtermDebtTypeAxis
= prx_TermLoanMember
/ us-gaap_VariableRateAxis
= us-gaap_LondonInterbankOfferedRateLIBORMember
   
New Term Loan [Member] | Term Loan [Member] | Base Rate [Member]                  
Debt Instrument [Line Items]                  
Debt, basis spread on variable rate             2.25%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_DebtInstrumentAxis
= prx_NewTermLoanMember
/ us-gaap_LongtermDebtTypeAxis
= prx_TermLoanMember
/ us-gaap_VariableRateAxis
= us-gaap_BaseRateMember
   
Debt, variable rate floor             2.00%prx_DebtInstrumentVariableRateFloor
/ us-gaap_DebtInstrumentAxis
= prx_NewTermLoanMember
/ us-gaap_LongtermDebtTypeAxis
= prx_TermLoanMember
/ us-gaap_VariableRateAxis
= us-gaap_BaseRateMember
   
Extended Revolving Facility Maturing December 28, 2017 [Member] | Revolving Credit Facility [Member]                  
Debt Instrument [Line Items]                  
Line of credit, maximum borrowing capacity               127,500,000.0us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_DebtInstrumentAxis
= prx_ExtendedRevolvingFacilityMaturingDecember282017Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_RevolvingCreditFacilityMember
 
Line of credit facility, amount outstanding   0us-gaap_LineOfCredit
/ us-gaap_DebtInstrumentAxis
= prx_ExtendedRevolvingFacilityMaturingDecember282017Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_RevolvingCreditFacilityMember
             
Extended Revolving Facility Maturing December 28, 2017 [Member] | Revolving Credit Facility [Member] | LIBOR [Member]                  
Debt Instrument [Line Items]                  
Debt, basis spread on variable rate               3.25%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_DebtInstrumentAxis
= prx_ExtendedRevolvingFacilityMaturingDecember282017Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_RevolvingCreditFacilityMember
/ us-gaap_VariableRateAxis
= us-gaap_LondonInterbankOfferedRateLIBORMember
 
Extended Revolving Facility Maturing December 28, 2017 [Member] | Revolving Credit Facility [Member] | Base Rate [Member]                  
Debt Instrument [Line Items]                  
Debt, basis spread on variable rate               2.25%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_DebtInstrumentAxis
= prx_ExtendedRevolvingFacilityMaturingDecember282017Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_RevolvingCreditFacilityMember
/ us-gaap_VariableRateAxis
= us-gaap_BaseRateMember
 
Non-Extended Portion of Revolving Facility [Member] | Revolving Credit Facility [Member]                  
Debt Instrument [Line Items]                  
Line of credit, maximum borrowing capacity               22,500,000.0us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_DebtInstrumentAxis
= prx_NonExtendedPortionOfRevolvingFacilityMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_RevolvingCreditFacilityMember
 
Non-Extended Portion of Revolving Facility [Member] | Revolving Credit Facility [Member] | LIBOR [Member]                  
Debt Instrument [Line Items]                  
Debt, basis spread on variable rate               3.75%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_DebtInstrumentAxis
= prx_NonExtendedPortionOfRevolvingFacilityMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_RevolvingCreditFacilityMember
/ us-gaap_VariableRateAxis
= us-gaap_LondonInterbankOfferedRateLIBORMember
 
Non-Extended Portion of Revolving Facility [Member] | Revolving Credit Facility [Member] | Base Rate [Member]                  
Debt Instrument [Line Items]                  
Debt, basis spread on variable rate               2.75%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_DebtInstrumentAxis
= prx_NonExtendedPortionOfRevolvingFacilityMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_RevolvingCreditFacilityMember
/ us-gaap_VariableRateAxis
= us-gaap_BaseRateMember
 
7.375% Senior Notes Due 2020 [Member] | Senior Notes [Member]                  
Debt Instrument [Line Items]                  
Senior secured term loan   490,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= prx_SevenPointThreeSevenFivePercentSeniorNotesDue2020Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
  490,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= prx_SevenPointThreeSevenFivePercentSeniorNotesDue2020Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
  490,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= prx_SevenPointThreeSevenFivePercentSeniorNotesDue2020Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
     
Debt interest rate   7.375%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= prx_SevenPointThreeSevenFivePercentSeniorNotesDue2020Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
7.375%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= prx_SevenPointThreeSevenFivePercentSeniorNotesDue2020Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
7.375%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= prx_SevenPointThreeSevenFivePercentSeniorNotesDue2020Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
  7.375%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= prx_SevenPointThreeSevenFivePercentSeniorNotesDue2020Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
     
Debt minimum amount of payment default causing default       40,000,000prx_DebtInstrumentDebtDefaultMinimumAmountOfPaymentDefaultCausingDefault
/ us-gaap_DebtInstrumentAxis
= prx_SevenPointThreeSevenFivePercentSeniorNotesDue2020Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
  40,000,000prx_DebtInstrumentDebtDefaultMinimumAmountOfPaymentDefaultCausingDefault
/ us-gaap_DebtInstrumentAxis
= prx_SevenPointThreeSevenFivePercentSeniorNotesDue2020Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
     
Debt minimum amount of failure to pay final judgment causing default       40,000,000prx_DebtInstrumentDebtDefaultMinimumAmountofFailuretoPayFinalJudgmentCausingDefault
/ us-gaap_DebtInstrumentAxis
= prx_SevenPointThreeSevenFivePercentSeniorNotesDue2020Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
  40,000,000prx_DebtInstrumentDebtDefaultMinimumAmountofFailuretoPayFinalJudgmentCausingDefault
/ us-gaap_DebtInstrumentAxis
= prx_SevenPointThreeSevenFivePercentSeniorNotesDue2020Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
     
7.375% Senior Notes Due 2020 [Member] | Senior Notes [Member] | Successor [Member]                  
Debt Instrument [Line Items]                  
Long-term debt   490,000,000us-gaap_LongTermDebt
/ us-gaap_DebtInstrumentAxis
= prx_SevenPointThreeSevenFivePercentSeniorNotesDue2020Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
/ us-gaap_StatementScenarioAxis
= us-gaap_SuccessorMember
490,000,000us-gaap_LongTermDebt
/ us-gaap_DebtInstrumentAxis
= prx_SevenPointThreeSevenFivePercentSeniorNotesDue2020Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
/ us-gaap_StatementScenarioAxis
= us-gaap_SuccessorMember
           
7.375% Senior Notes Due 2020 [Member] | Senior Notes [Member] | Successor [Member] | Fair Value, Measurements, Recurring [Member]                  
Debt Instrument [Line Items]                  
Debt, fair value   507,763,000us-gaap_DebtInstrumentFairValue
/ us-gaap_DebtInstrumentAxis
= prx_SevenPointThreeSevenFivePercentSeniorNotesDue2020Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
/ us-gaap_StatementScenarioAxis
= us-gaap_SuccessorMember
507,150,000us-gaap_DebtInstrumentFairValue
/ us-gaap_DebtInstrumentAxis
= prx_SevenPointThreeSevenFivePercentSeniorNotesDue2020Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
/ us-gaap_StatementScenarioAxis
= us-gaap_SuccessorMember
           
7.375% Senior Notes Due 2020 [Member] | Senior Notes [Member] | Successor [Member] | Fair Value, Measurements, Recurring [Member] | Level 2 [Member]                  
Debt Instrument [Line Items]                  
Debt, fair value   507,800,000us-gaap_DebtInstrumentFairValue
/ us-gaap_DebtInstrumentAxis
= prx_SevenPointThreeSevenFivePercentSeniorNotesDue2020Member
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
/ us-gaap_StatementScenarioAxis
= us-gaap_SuccessorMember
507,150,000us-gaap_DebtInstrumentFairValue
/ us-gaap_DebtInstrumentAxis
= prx_SevenPointThreeSevenFivePercentSeniorNotesDue2020Member
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
/ us-gaap_StatementScenarioAxis
= us-gaap_SuccessorMember
           
7.375% Senior Notes Due 2020 [Member] | Senior Notes [Member] | Prior to October 15, 2015, up to 40% of aggregate principal amount [Member]                  
Debt Instrument [Line Items]                  
Debt percentage of principal amount redeemed           40.00%us-gaap_DebtInstrumentRedemptionPricePercentageOfPrincipalAmountRedeemed
/ us-gaap_DebtInstrumentAxis
= prx_SevenPointThreeSevenFivePercentSeniorNotesDue2020Member
/ us-gaap_DebtInstrumentRedemptionPeriodAxis
= us-gaap_DebtInstrumentRedemptionPeriodOneMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
     
Debt redemption price percentage           107.375%us-gaap_DebtInstrumentRedemptionPricePercentage
/ us-gaap_DebtInstrumentAxis
= prx_SevenPointThreeSevenFivePercentSeniorNotesDue2020Member
/ us-gaap_DebtInstrumentRedemptionPeriodAxis
= us-gaap_DebtInstrumentRedemptionPeriodOneMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
     
7.375% Senior Notes Due 2020 [Member] | Senior Notes [Member] | Prior to October 13, 2015, up to 100% of aggregate principal amount [Member]                  
Debt Instrument [Line Items]                  
Debt redemption price percentage           100.00%us-gaap_DebtInstrumentRedemptionPricePercentage
/ us-gaap_DebtInstrumentAxis
= prx_SevenPointThreeSevenFivePercentSeniorNotesDue2020Member
/ us-gaap_DebtInstrumentRedemptionPeriodAxis
= us-gaap_DebtInstrumentRedemptionPeriodTwoMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
     
New Tranche B Term Loans [Member] | Term Loan [Member]                  
Debt Instrument [Line Items]                  
Senior secured term loan                 1,055,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= prx_NewTrancheBTermLoansMember
/ us-gaap_LongtermDebtTypeAxis
= prx_TermLoanMember
Basis spread on variable rate, reduction                 0.25%prx_DebtInstrumentBasisSpreadonVariableRateReduction
/ us-gaap_DebtInstrumentAxis
= prx_NewTrancheBTermLoansMember
/ us-gaap_LongtermDebtTypeAxis
= prx_TermLoanMember
Soft call provision prepayment premium                 1.00%prx_DebtInstrumentSoftCallProvisionPrepaymentPremium
/ us-gaap_DebtInstrumentAxis
= prx_NewTrancheBTermLoansMember
/ us-gaap_LongtermDebtTypeAxis
= prx_TermLoanMember
Variable rate step-down percentage upon achievement of net leverage level                 0.25%prx_DebtInstrumentVariableRateStepDownPercentageUponAchievementOfNetLeverageLevel
/ us-gaap_DebtInstrumentAxis
= prx_NewTrancheBTermLoansMember
/ us-gaap_LongtermDebtTypeAxis
= prx_TermLoanMember
Net Leverage Ratio                 3.75prx_NetLeverageRatio
/ us-gaap_DebtInstrumentAxis
= prx_NewTrancheBTermLoansMember
/ us-gaap_LongtermDebtTypeAxis
= prx_TermLoanMember
New Tranche B Term Loans [Member] | Term Loan [Member] | LIBOR [Member]                  
Debt Instrument [Line Items]                  
Debt, basis spread on variable rate                 3.00%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_DebtInstrumentAxis
= prx_NewTrancheBTermLoansMember
/ us-gaap_LongtermDebtTypeAxis
= prx_TermLoanMember
/ us-gaap_VariableRateAxis
= us-gaap_LondonInterbankOfferedRateLIBORMember
New Tranche B Term Loans [Member] | Term Loan [Member] | Base Rate [Member]                  
Debt Instrument [Line Items]                  
Debt, basis spread on variable rate                 2.00%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_DebtInstrumentAxis
= prx_NewTrancheBTermLoansMember
/ us-gaap_LongtermDebtTypeAxis
= prx_TermLoanMember
/ us-gaap_VariableRateAxis
= us-gaap_BaseRateMember
Incremental Term B-2 Joinder Agreement [Member] | Term Loan [Member]                  
Debt Instrument [Line Items]                  
Senior secured term loan                 $ 395,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= prx_IncrementalTermB2JoinderAgreementMember
/ us-gaap_LongtermDebtTypeAxis
= prx_TermLoanMember