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RESERVE FOR LOSSES AND LOSS EXPENSES (DETAILS 2) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Reconciliation of Beginning and Ending Gross Unpaid Losses and Loss Expenses      
Gross reserve for losses and loss expenses, beginning of year $ 9,582,140us-gaap_LiabilityForClaimsAndClaimsAdjustmentExpense $ 9,058,731us-gaap_LiabilityForClaimsAndClaimsAdjustmentExpense $ 8,425,045us-gaap_LiabilityForClaimsAndClaimsAdjustmentExpense
Less reinsurance recoverable on unpaid losses, beginning of year (1,900,112)us-gaap_ReinsuranceRecoverableForUnpaidClaimsAndClaimsAdjustments (1,825,617)us-gaap_ReinsuranceRecoverableForUnpaidClaimsAndClaimsAdjustments (1,736,823)us-gaap_ReinsuranceRecoverableForUnpaidClaimsAndClaimsAdjustments
Net reserve for unpaid losses and loss expenses, beginning of year 7,682,028us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseNet 7,233,114us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseNet 6,688,222us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseNet
Net incurred losses and loss expenses related to:      
Current year 2,445,666us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersCurrentYearClaimsAndClaimsAdjustmentExpense 2,353,631us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersCurrentYearClaimsAndClaimsAdjustmentExpense 2,340,868us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersCurrentYearClaimsAndClaimsAdjustmentExpense
Prior years (258,944)us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense (219,436)us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense (244,840)us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense
Net incurred losses and loss expenses 2,186,722us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseIncurredClaims1 2,134,195us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseIncurredClaims1 2,096,028us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseIncurredClaims1
Net paid losses and loss expenses related to:      
Current year (387,197)us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseClaimsPaidCurrentYear1 (318,006)us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseClaimsPaidCurrentYear1 (322,836)us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseClaimsPaidCurrentYear1
Prior years (1,544,664)us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseClaimsPaidPriorYears1 (1,373,459)us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseClaimsPaidPriorYears1 (1,299,384)us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseClaimsPaidPriorYears1
Net paid losses and loss expenses (1,931,861)us-gaap_PaymentsForLossesAndLossAdjustmentExpense (1,691,465)us-gaap_PaymentsForLossesAndLossAdjustmentExpense (1,622,220)us-gaap_PaymentsForLossesAndLossAdjustmentExpense
Foreign exchange and other (230,372)axs_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseForeignExchangeAndOther 6,184axs_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseForeignExchangeAndOther 71,084axs_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseForeignExchangeAndOther
Net reserve for unpaid losses and loss expenses, end of year 7,706,517us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseNet 7,682,028us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseNet 7,233,114us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseNet
Reinsurance recoverable on unpaid losses, end of year 1,890,280us-gaap_ReinsuranceRecoverableForUnpaidClaimsAndClaimsAdjustments 1,900,112us-gaap_ReinsuranceRecoverableForUnpaidClaimsAndClaimsAdjustments 1,825,617us-gaap_ReinsuranceRecoverableForUnpaidClaimsAndClaimsAdjustments
Gross reserve for losses and loss expenses, end of year $ 9,596,797us-gaap_LiabilityForClaimsAndClaimsAdjustmentExpense $ 9,582,140us-gaap_LiabilityForClaimsAndClaimsAdjustmentExpense $ 9,058,731us-gaap_LiabilityForClaimsAndClaimsAdjustmentExpense