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Unpaid Losses and Loss Expenses and Policy Benefits for Life and Annuity Contracts (Details - Other Details) (USD $)
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Prior Year Development [Line Items]      
Total net Non-life prior year loss development $ 660,413,000us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense $ 721,499,000us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense $ 628,065,000us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense
Liability For Asbestos And Environmental Claims [Line Items]      
Net liability for asbestos and environmental claims 189,000,000us-gaap_LiabilityForAsbestosAndEnvironmentalClaimsNet 193,000,000us-gaap_LiabilityForAsbestosAndEnvironmentalClaimsNet  
Gross liability for asbestos and environmental claims 201,000,000us-gaap_LiabilityForAsbestosAndEnvironmentalClaimsGross 203,000,000us-gaap_LiabilityForAsbestosAndEnvironmentalClaimsGross  
Liability For Future Policy Benefits [Line Items]      
Development from prior accident years 19,000,000pre_LiabilityForFuturePolicyBenefitsExpenseIncurredClaimsPriorYears 39,000,000pre_LiabilityForFuturePolicyBenefitsExpenseIncurredClaimsPriorYears 14,000,000pre_LiabilityForFuturePolicyBenefitsExpenseIncurredClaimsPriorYears
Interest rate assumptions      
Low end interest rate assumption 0.00%us-gaap_TraditionalLifeInterestRateLowEnd 0.10%us-gaap_TraditionalLifeInterestRateLowEnd  
High end interest rate assumption 6.80%us-gaap_TraditionalLifeInterestRateHighEnd 6.80%us-gaap_TraditionalLifeInterestRateHighEnd  
Paris Re Reserve Agreement      
Guaranteed reserves related to Paris Re 575,000,000pre_GuaranteedReserves 727,000,000pre_GuaranteedReserves  
Asbestos Liabilities Of Paris Re [Member]      
Liability For Asbestos And Environmental Claims [Line Items]      
Gross liability for asbestos and environmental claims 127,000,000us-gaap_LiabilityForAsbestosAndEnvironmentalClaimsGross
/ pre_LiabilityForAsbestosAndEnvironmentalClaimsBySourceAxis
= pre_AsbestosLiabilitiesOfParisReMember
123,000,000us-gaap_LiabilityForAsbestosAndEnvironmentalClaimsGross
/ pre_LiabilityForAsbestosAndEnvironmentalClaimsBySourceAxis
= pre_AsbestosLiabilitiesOfParisReMember
 
Asbestos Liabilities Of Partner Re SA And Partner Re US [Member]      
Liability For Asbestos And Environmental Claims [Line Items]      
Gross liability for asbestos and environmental claims 74,000,000us-gaap_LiabilityForAsbestosAndEnvironmentalClaimsGross
/ pre_LiabilityForAsbestosAndEnvironmentalClaimsBySourceAxis
= pre_AsbestosLiabilitiesOfPartnerReSaAndPartnerReUsMember
80,000,000us-gaap_LiabilityForAsbestosAndEnvironmentalClaimsGross
/ pre_LiabilityForAsbestosAndEnvironmentalClaimsBySourceAxis
= pre_AsbestosLiabilitiesOfPartnerReSaAndPartnerReUsMember
 
North America Segment [Member]      
Prior Year Development [Line Items]      
Total net Non-life prior year loss development 250,942,000us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense
/ pre_NonLifeSubsegmentsAxis
= pre_NorthAmericaSegmentMember
222,839,000us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense
/ pre_NonLifeSubsegmentsAxis
= pre_NorthAmericaSegmentMember
218,483,000us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense
/ pre_NonLifeSubsegmentsAxis
= pre_NorthAmericaSegmentMember
Global (Non-US) P&C [Member]      
Prior Year Development [Line Items]      
Total net Non-life prior year loss development 134,394,000us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense
/ pre_NonLifeSubsegmentsAxis
= pre_GlobalNonUsPcMember
180,052,000us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense
/ pre_NonLifeSubsegmentsAxis
= pre_GlobalNonUsPcMember
114,279,000us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense
/ pre_NonLifeSubsegmentsAxis
= pre_GlobalNonUsPcMember
Global Specialty [Member]      
Prior Year Development [Line Items]      
Total net Non-life prior year loss development 257,696,000us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense
/ pre_NonLifeSubsegmentsAxis
= pre_GlobalSpecialtyMember
227,383,000us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense
/ pre_NonLifeSubsegmentsAxis
= pre_GlobalSpecialtyMember
250,523,000us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense
/ pre_NonLifeSubsegmentsAxis
= pre_GlobalSpecialtyMember
Global Specialty [Member] | Credit/SuretyandEngineering [Member]      
Prior Year Development [Line Items]      
Total net Non-life prior year loss development (26,000,000)us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense
/ pre_NonLifeLineOfBusinessAxis
= pre_CreditSuretyandEngineeringMember
/ pre_NonLifeSubsegmentsAxis
= pre_GlobalSpecialtyMember
   
Catastrophe Segment [Member]      
Prior Year Development [Line Items]      
Total net Non-life prior year loss development $ 17,381,000us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense
/ pre_NonLifeSubsegmentsAxis
= pre_CatastropheSegmentMember
$ 91,225,000us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense
/ pre_NonLifeSubsegmentsAxis
= pre_CatastropheSegmentMember
$ 44,780,000us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense
/ pre_NonLifeSubsegmentsAxis
= pre_CatastropheSegmentMember