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Summary of Significant Accounting Policies - Narrative (Details) (USD $)
0 Months Ended 12 Months Ended 3 Months Ended 9 Months Ended
Oct. 01, 2014
Dec. 31, 2014
segment
Dec. 31, 2013
segment
Dec. 31, 2012
Sep. 28, 2012
Accounting Policies [Line Items]          
Goodwill   $ 1,012,108,000us-gaap_Goodwill $ 855,726,000us-gaap_Goodwill    
Goodwill, impairment loss 0us-gaap_GoodwillImpairmentLoss 0us-gaap_GoodwillImpairmentLoss      
Number of business segments   2us-gaap_NumberOfReportableSegments 2us-gaap_NumberOfReportableSegments    
Additional paid-in capital   808,647,000us-gaap_AdditionalPaidInCapital 687,272,000us-gaap_AdditionalPaidInCapital    
Revenue [Member] | Customer Concentration Risk [Member]          
Accounting Policies [Line Items]          
Concentration risk, number of customers   4prx_ConcentrationRiskNumberofCustomers
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueNetMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CustomerConcentrationRiskMember
     
Revenue [Member] | Customer Concentration Risk [Member] | Four Largest Customers [Member]          
Accounting Policies [Line Items]          
Concentration risk, percentage (individually greater than)   70.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueNetMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CustomerConcentrationRiskMember
/ us-gaap_MajorCustomersAxis
= prx_FourLargestCustomersMember
     
Revenue [Member] | Customer Concentration Risk [Member] | McKesson Drug Co. [Member]          
Accounting Policies [Line Items]          
Concentration risk, percentage (individually greater than)   25.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueNetMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CustomerConcentrationRiskMember
/ us-gaap_MajorCustomersAxis
= prx_McKessonDrugCo.Member
     
Revenue [Member] | Customer Concentration Risk [Member] | Cardinal Health, Inc. [Member]          
Accounting Policies [Line Items]          
Concentration risk, percentage (individually greater than)   18.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueNetMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CustomerConcentrationRiskMember
/ us-gaap_MajorCustomersAxis
= prx_CardinalHealthInc.Member
     
Revenue [Member] | Customer Concentration Risk [Member] | CVS Health Corporation [Member]          
Accounting Policies [Line Items]          
Concentration risk, percentage (individually greater than)   15.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueNetMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CustomerConcentrationRiskMember
/ us-gaap_MajorCustomersAxis
= prx_CVSHealthCorporationMember
     
Revenue [Member] | Customer Concentration Risk [Member] | AmerisourceBergen Corporation [Member]          
Accounting Policies [Line Items]          
Concentration risk, percentage (individually greater than)   13.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueNetMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CustomerConcentrationRiskMember
/ us-gaap_MajorCustomersAxis
= prx_AmerisourceBergenCorporationMember
     
Minimum [Member] | Computer software [Member]          
Accounting Policies [Line Items]          
Property, plant and equipment estimated useful lives (years)   3 years      
Maximum [Member] | Computer software [Member]          
Accounting Policies [Line Items]          
Property, plant and equipment estimated useful lives (years)   7 years      
Restatement Adjustment [Member]          
Accounting Policies [Line Items]          
(Benefit) provision for income taxes       29,000us-gaap_IncomeTaxExpenseBenefit
/ us-gaap_StatementScenarioAxis
= us-gaap_RestatementAdjustmentMember
83,000us-gaap_IncomeTaxExpenseBenefit
/ us-gaap_StatementScenarioAxis
= us-gaap_RestatementAdjustmentMember
Goodwill     6,100,000us-gaap_Goodwill
/ us-gaap_StatementScenarioAxis
= us-gaap_RestatementAdjustmentMember
   
Deferred Tax Liabilities, Gross, Noncurrent     5,400,000us-gaap_DeferredTaxLiabilitiesGrossNoncurrent
/ us-gaap_StatementScenarioAxis
= us-gaap_RestatementAdjustmentMember
   
Additional paid-in capital     700,000us-gaap_AdditionalPaidInCapital
/ us-gaap_StatementScenarioAxis
= us-gaap_RestatementAdjustmentMember
   
Successor [Member]          
Accounting Policies [Line Items]          
(Benefit) provision for income taxes   (72,993,000)us-gaap_IncomeTaxExpenseBenefit
/ us-gaap_StatementScenarioAxis
= us-gaap_SuccessorMember
(61,182,000)us-gaap_IncomeTaxExpenseBenefit
/ us-gaap_StatementScenarioAxis
= us-gaap_SuccessorMember
(17,653,000)us-gaap_IncomeTaxExpenseBenefit
/ us-gaap_StatementScenarioAxis
= us-gaap_SuccessorMember
 
Goodwill   1,012,108,000us-gaap_Goodwill
/ us-gaap_StatementScenarioAxis
= us-gaap_SuccessorMember
855,726,000us-gaap_Goodwill
/ us-gaap_StatementScenarioAxis
= us-gaap_SuccessorMember
856,726,000us-gaap_Goodwill
/ us-gaap_StatementScenarioAxis
= us-gaap_SuccessorMember
 
Net product sales, cash collected   1,462,000,000us-gaap_ProceedsFromCustomers
/ us-gaap_StatementScenarioAxis
= us-gaap_SuccessorMember
1,150,000,000us-gaap_ProceedsFromCustomers
/ us-gaap_StatementScenarioAxis
= us-gaap_SuccessorMember
258,000,000us-gaap_ProceedsFromCustomers
/ us-gaap_StatementScenarioAxis
= us-gaap_SuccessorMember
 
Distribution costs   3,400,000us-gaap_ShippingHandlingAndTransportationCosts
/ us-gaap_StatementScenarioAxis
= us-gaap_SuccessorMember
3,300,000us-gaap_ShippingHandlingAndTransportationCosts
/ us-gaap_StatementScenarioAxis
= us-gaap_SuccessorMember
1,000,000us-gaap_ShippingHandlingAndTransportationCosts
/ us-gaap_StatementScenarioAxis
= us-gaap_SuccessorMember
 
Debt issuance costs   10,700,000us-gaap_DebtRelatedCommitmentFeesAndDebtIssuanceCosts
/ us-gaap_StatementScenarioAxis
= us-gaap_SuccessorMember
10,700,000us-gaap_DebtRelatedCommitmentFeesAndDebtIssuanceCosts
/ us-gaap_StatementScenarioAxis
= us-gaap_SuccessorMember
2,800,000us-gaap_DebtRelatedCommitmentFeesAndDebtIssuanceCosts
/ us-gaap_StatementScenarioAxis
= us-gaap_SuccessorMember
 
Predecessor [Member]          
Accounting Policies [Line Items]          
(Benefit) provision for income taxes         29,530,000us-gaap_IncomeTaxExpenseBenefit
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
Net product sales, cash collected         854,000,000us-gaap_ProceedsFromCustomers
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
Distribution costs         2,300,000us-gaap_ShippingHandlingAndTransportationCosts
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
Debt issuance costs         $ 1,900,000us-gaap_DebtRelatedCommitmentFeesAndDebtIssuanceCosts
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
7.375% Senior Notes Due 2020 [Member] | Senior Notes [Member]          
Accounting Policies [Line Items]          
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