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Realized And Unrealized Investment Gains Realized and Unrealized Investment Gains (Loss) (Realized and unrealized investmetns gains(losses)) (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Investments, Debt and Equity Securities [Abstract]    
Fixed maturity securities, gains $ 4,146wrb_AvailableforSaleandHeldtoMaturityRealizedGainsDebtSecuritiesExcludingOtherthanTemporaryImpairmentsandAllowances $ 2,062wrb_AvailableforSaleandHeldtoMaturityRealizedGainsDebtSecuritiesExcludingOtherthanTemporaryImpairmentsandAllowances
Fixed maturity securities, losses (1,077)wrb_AvailableforSaleandHeldtoMaturityRealizedLossesDebtSecuritiesExcludingOtherthanTemporaryImpairmentsandAllowances (1,598)wrb_AvailableforSaleandHeldtoMaturityRealizedLossesDebtSecuritiesExcludingOtherthanTemporaryImpairmentsandAllowances
Equity securities available for sale 9,702wrb_AvailableforsaleSecuritiesGrossRealizedGainLossEquitySecuritiesExcludingOtherthanTemporaryImpairments 6,457wrb_AvailableforsaleSecuritiesGrossRealizedGainLossEquitySecuritiesExcludingOtherthanTemporaryImpairments
Investment funds (1,511)us-gaap_EquityMethodInvestmentRealizedGainLossOnDisposal 45,833us-gaap_EquityMethodInvestmentRealizedGainLossOnDisposal
Real Estate Realized Gain (Loss) on Disposal 0wrb_REalEstateRealizedGainLossonDisposal 0wrb_REalEstateRealizedGainLossonDisposal
Other 7,784us-gaap_GainLossOnSaleOfOtherInvestments 0us-gaap_GainLossOnSaleOfOtherInvestments
Realized Gain (Loss) on Investments, Including Equity Method Investments, Excluding Other than Temporary Impairments and Allowances 19,044wrb_RealizedGainLossonInvestmentsIncludingEquityMethodInvestmentsExcludingOtherthanTemporaryImpairmentsandAllowances 52,754wrb_RealizedGainLossonInvestmentsIncludingEquityMethodInvestmentsExcludingOtherthanTemporaryImpairmentsandAllowances
Net investment gains 19,044wrb_RealizedGainLossonMarketableSecuritiesEquityMethodInvestmentsandOtherInvestmentsBeforeTax 52,754wrb_RealizedGainLossonMarketableSecuritiesEquityMethodInvestmentsandOtherInvestmentsBeforeTax
Income tax expense (6,665)wrb_RealizedGainLossonMarketableSecuritiesEquityMethodInvestmentsandOtherInvestmentsTax (18,465)wrb_RealizedGainLossonMarketableSecuritiesEquityMethodInvestmentsandOtherInvestmentsTax
Total after-tax realized investment gains $ 12,379wrb_RealizedGainLossonMarketableSecuritiesEquityMethodInvestmentsandOtherInvestmentsNetofTax $ 34,289wrb_RealizedGainLossonMarketableSecuritiesEquityMethodInvestmentsandOtherInvestmentsNetofTax