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RESERVE FOR LOSSES AND LOSS EXPENSES (DETAILS 3) (USD $) In Thousands, unless otherwise specified | 3 Months Ended
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Mar. 31, 2015 | Mar. 31, 2014
Additional Information Related to Net Incurred Losses [Line Items] |  |
Net favorable (adverse) prior year reserve development | $ 50,051 us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense | $ 43,493 us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense
Short Tail Lines Insurance And Reinsurance Business [Member] |  |
Additional Information Related to Net Incurred Losses [Line Items] |  |
Net favorable (adverse) prior year reserve development | 28,000 us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_NoncatastrophicEventAxis = axs_ShortTailReservingClassInsuranceAndReinsuranceBusinessMember | 29,000 us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_NoncatastrophicEventAxis = axs_ShortTailReservingClassInsuranceAndReinsuranceBusinessMember
Professional Lines Reinsurance Business [Member] |  |
Additional Information Related to Net Incurred Losses [Line Items] |  |
Net favorable (adverse) prior year reserve development | 20,000 us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_NoncatastrophicEventAxis = axs_ProfessionalLinesReinsuranceBusinessMember | 6,000 us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_NoncatastrophicEventAxis = axs_ProfessionalLinesReinsuranceBusinessMember
Insurance Credit And Political Risk [Member] |  |
Additional Information Related to Net Incurred Losses [Line Items] |  |
Net favorable (adverse) prior year reserve development | (11,000)us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_NoncatastrophicEventAxis = axs_CreditAndPoliticalRiskMember |
Liability Reinsurance Business [Member] |  |
Additional Information Related to Net Incurred Losses [Line Items] |  |
Net favorable (adverse) prior year reserve development | 12,000 us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_NoncatastrophicEventAxis = axs_LiabilityReinsuranceBusinessMember | 6,000 us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_NoncatastrophicEventAxis = axs_LiabilityReinsuranceBusinessMember
Liability Insurance Business [Member] |  |
Additional Information Related to Net Incurred Losses [Line Items] |  |
Net favorable (adverse) prior year reserve development | $ (11,000)us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_NoncatastrophicEventAxis = axs_LiabilityInsuranceBusinessMember |

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- Definition Amount of expense for claims incurred in prior reporting periods and related claims settlement costs. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 235 -Section S99 -Paragraph 3 -Subparagraph (SX 210.12-18) -URI http://asc.fasb.org/extlink&oid=34713774&loc=d3e575016-122915 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 18 -Article 12 + Details
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