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DERIVATIVE INSTRUMENTS (DETAILS) (USD $) In Thousands, unless otherwise specified | Mar. 31, 2015 | Dec. 31, 2014
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Derivative Fair Values on Consolidated Balance Sheet [Line Items] |  |
Asset Derivative Fair Value | $ 4,250 us-gaap_DerivativeAssets | $ 7,264 us-gaap_DerivativeAssets
Liability Derivative Fair Value | 17,620 us-gaap_DerivativeLiabilities | 18,329 us-gaap_DerivativeLiabilities
Other Assets [Member] |  |
Derivative Fair Values on Consolidated Balance Sheet [Line Items] |  |
Asset Derivative Fair Value | 4,250 us-gaap_DerivativeAssets / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherAssetsMember | 7,264 us-gaap_DerivativeAssets / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherAssetsMember
Other Liabilities [Member] |  |
Derivative Fair Values on Consolidated Balance Sheet [Line Items] |  |
Liability Derivative Fair Value | 17,620 us-gaap_DerivativeLiabilities / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherLiabilitiesMember | 18,329 us-gaap_DerivativeLiabilities / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherLiabilitiesMember
Investment Portfolio [Member] | Foreign Exchange Forward Contracts [Member] | Not Designated as Hedging Instruments [Member] |  |
Derivative Fair Values on Consolidated Balance Sheet [Line Items] |  |
Derivative Notional Amount | 235,623 invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForeignExchangeForwardMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember / axs_RelatedPortfolioAxis = axs_InvestmentPortfolioMember | 161,678 invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForeignExchangeForwardMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember / axs_RelatedPortfolioAxis = axs_InvestmentPortfolioMember
Investment Portfolio [Member] | Foreign Exchange Forward Contracts [Member] | Other Assets [Member] | Not Designated as Hedging Instruments [Member] |  |
Derivative Fair Values on Consolidated Balance Sheet [Line Items] |  |
Asset Derivative Fair Value | 3,607 us-gaap_DerivativeAssets / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherAssetsMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForeignExchangeForwardMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember / axs_RelatedPortfolioAxis = axs_InvestmentPortfolioMember | 3,925 us-gaap_DerivativeAssets / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherAssetsMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForeignExchangeForwardMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember / axs_RelatedPortfolioAxis = axs_InvestmentPortfolioMember
Investment Portfolio [Member] | Foreign Exchange Forward Contracts [Member] | Other Liabilities [Member] | Not Designated as Hedging Instruments [Member] |  |
Derivative Fair Values on Consolidated Balance Sheet [Line Items] |  |
Liability Derivative Fair Value | 40 us-gaap_DerivativeLiabilities / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherLiabilitiesMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForeignExchangeForwardMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember / axs_RelatedPortfolioAxis = axs_InvestmentPortfolioMember | 12 us-gaap_DerivativeLiabilities / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherLiabilitiesMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForeignExchangeForwardMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember / axs_RelatedPortfolioAxis = axs_InvestmentPortfolioMember
Investment Portfolio [Member] | Interest Rate Swap [Member] | Not Designated as Hedging Instruments [Member] |  |
Derivative Fair Values on Consolidated Balance Sheet [Line Items] |  |
Derivative Notional Amount | 0 invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateSwapMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember / axs_RelatedPortfolioAxis = axs_InvestmentPortfolioMember | 140,000 invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateSwapMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember / axs_RelatedPortfolioAxis = axs_InvestmentPortfolioMember
Investment Portfolio [Member] | Interest Rate Swap [Member] | Other Assets [Member] | Not Designated as Hedging Instruments [Member] |  |
Derivative Fair Values on Consolidated Balance Sheet [Line Items] |  |
Asset Derivative Fair Value | 0 us-gaap_DerivativeAssets / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherAssetsMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateSwapMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember / axs_RelatedPortfolioAxis = axs_InvestmentPortfolioMember | 0 us-gaap_DerivativeAssets / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherAssetsMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateSwapMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember / axs_RelatedPortfolioAxis = axs_InvestmentPortfolioMember
Investment Portfolio [Member] | Interest Rate Swap [Member] | Other Liabilities [Member] | Not Designated as Hedging Instruments [Member] |  |
Derivative Fair Values on Consolidated Balance Sheet [Line Items] |  |
Liability Derivative Fair Value | 0 us-gaap_DerivativeLiabilities / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherLiabilitiesMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateSwapMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember / axs_RelatedPortfolioAxis = axs_InvestmentPortfolioMember | 248 us-gaap_DerivativeLiabilities / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherLiabilitiesMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateSwapMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember / axs_RelatedPortfolioAxis = axs_InvestmentPortfolioMember
Underwriting Portfolio [Member] | Foreign Exchange Forward Contracts [Member] | Not Designated as Hedging Instruments [Member] |  |
Derivative Fair Values on Consolidated Balance Sheet [Line Items] |  |
Derivative Notional Amount | 664,621 invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForeignExchangeForwardMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember / axs_RelatedPortfolioAxis = axs_UnderwritingPortfolioMember | 577,836 invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForeignExchangeForwardMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember / axs_RelatedPortfolioAxis = axs_UnderwritingPortfolioMember
Underwriting Portfolio [Member] | Foreign Exchange Forward Contracts [Member] | Other Assets [Member] | Not Designated as Hedging Instruments [Member] |  |
Derivative Fair Values on Consolidated Balance Sheet [Line Items] |  |
Asset Derivative Fair Value | 643 us-gaap_DerivativeAssets / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherAssetsMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForeignExchangeForwardMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember / axs_RelatedPortfolioAxis = axs_UnderwritingPortfolioMember | 3,228 us-gaap_DerivativeAssets / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherAssetsMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForeignExchangeForwardMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember / axs_RelatedPortfolioAxis = axs_UnderwritingPortfolioMember
Underwriting Portfolio [Member] | Foreign Exchange Forward Contracts [Member] | Other Liabilities [Member] | Not Designated as Hedging Instruments [Member] |  |
Derivative Fair Values on Consolidated Balance Sheet [Line Items] |  |
Liability Derivative Fair Value | 10,272 us-gaap_DerivativeLiabilities / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherLiabilitiesMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForeignExchangeForwardMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember / axs_RelatedPortfolioAxis = axs_UnderwritingPortfolioMember | 2,781 us-gaap_DerivativeLiabilities / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherLiabilitiesMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForeignExchangeForwardMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember / axs_RelatedPortfolioAxis = axs_UnderwritingPortfolioMember
Underwriting Portfolio [Member] | Weather Related Derivative [Member] | Not Designated as Hedging Instruments [Member] |  |
Derivative Fair Values on Consolidated Balance Sheet [Line Items] |  |
Derivative Notional Amount | 20,995 invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = axs_WeatherRelatedDerivativeMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember / axs_RelatedPortfolioAxis = axs_UnderwritingPortfolioMember | 58,124 invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = axs_WeatherRelatedDerivativeMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember / axs_RelatedPortfolioAxis = axs_UnderwritingPortfolioMember
Underwriting Portfolio [Member] | Weather Related Derivative [Member] | Other Assets [Member] | Not Designated as Hedging Instruments [Member] |  |
Derivative Fair Values on Consolidated Balance Sheet [Line Items] |  |
Asset Derivative Fair Value | 0 us-gaap_DerivativeAssets / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherAssetsMember / us-gaap_DerivativeInstrumentRiskAxis = axs_WeatherRelatedDerivativeMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember / axs_RelatedPortfolioAxis = axs_UnderwritingPortfolioMember | 111 us-gaap_DerivativeAssets / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherAssetsMember / us-gaap_DerivativeInstrumentRiskAxis = axs_WeatherRelatedDerivativeMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember / axs_RelatedPortfolioAxis = axs_UnderwritingPortfolioMember
Underwriting Portfolio [Member] | Weather Related Derivative [Member] | Other Liabilities [Member] | Not Designated as Hedging Instruments [Member] |  |
Derivative Fair Values on Consolidated Balance Sheet [Line Items] |  |
Liability Derivative Fair Value | $ 7,308 us-gaap_DerivativeLiabilities / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherLiabilitiesMember / us-gaap_DerivativeInstrumentRiskAxis = axs_WeatherRelatedDerivativeMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember / axs_RelatedPortfolioAxis = axs_UnderwritingPortfolioMember | $ 15,288 us-gaap_DerivativeLiabilities / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherLiabilitiesMember / us-gaap_DerivativeInstrumentRiskAxis = axs_WeatherRelatedDerivativeMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember / axs_RelatedPortfolioAxis = axs_UnderwritingPortfolioMember

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