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Available for Sale Marketable Debt Securities (Details) (USD $)
Dec. 31, 2014
Dec. 31, 2013
Schedule of Available-for-sale Securities [Line Items]    
Marketable securities $ 0us-gaap_MarketableSecurities  
Estimated Fair Value 0us-gaap_AvailableForSaleSecuritiesDebtSecuritiesCurrent 3,541,000us-gaap_AvailableForSaleSecuritiesDebtSecuritiesCurrent
Successor [Member] | Corporate Bonds [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Cost   3,522,000us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CorporateDebtSecuritiesMember
/ us-gaap_StatementScenarioAxis
= us-gaap_SuccessorMember
Unrealized Gain   19,000prx_AvailableforsaleDebtSecuritiesAccumulatedGrossUnrealizedGainbeforeTax
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CorporateDebtSecuritiesMember
/ us-gaap_StatementScenarioAxis
= us-gaap_SuccessorMember
Unrealized (Loss)   0prx_AvailableforsaleDebtSecuritiesAccumulatedGrossUnrealizedLossbeforeTax
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CorporateDebtSecuritiesMember
/ us-gaap_StatementScenarioAxis
= us-gaap_SuccessorMember
Estimated Fair Value   $ 3,541,000us-gaap_AvailableForSaleSecuritiesDebtSecuritiesCurrent
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CorporateDebtSecuritiesMember
/ us-gaap_StatementScenarioAxis
= us-gaap_SuccessorMember