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RESERVE FOR LOSSES AND LOSS EXPENSES (DETAILS) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Reconciliation of Beginning and Ending Gross Unpaid Losses and Loss Expenses    
Gross reserve for losses and loss expenses, beginning of period $ 9,596,797us-gaap_LiabilityForClaimsAndClaimsAdjustmentExpense $ 9,582,140us-gaap_LiabilityForClaimsAndClaimsAdjustmentExpense
Less reinsurance recoverable on unpaid losses, beginning of period (1,890,280)us-gaap_ReinsuranceRecoverableForUnpaidClaimsAndClaimsAdjustments (1,900,112)us-gaap_ReinsuranceRecoverableForUnpaidClaimsAndClaimsAdjustments
Net reserve for unpaid losses and loss expenses, beginning of period 7,706,517us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseNet 7,682,028us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseNet
Net incurred losses and loss expenses related to:    
Current year 568,988us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersCurrentYearClaimsAndClaimsAdjustmentExpense 587,700us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersCurrentYearClaimsAndClaimsAdjustmentExpense
Prior years (50,051)us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense (43,493)us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense
Net incurred losses and loss expenses 518,937us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseIncurredClaims1 544,207us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseIncurredClaims1
Net paid losses and loss expenses related to:    
Current year (23,527)us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseClaimsPaidCurrentYear1 (13,249)us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseClaimsPaidCurrentYear1
Prior years (485,315)us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseClaimsPaidPriorYears1 (444,466)us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseClaimsPaidPriorYears1
Net paid losses and loss expenses (508,842)us-gaap_PaymentsForLossesAndLossAdjustmentExpense (457,715)us-gaap_PaymentsForLossesAndLossAdjustmentExpense
Foreign exchange and other (162,969)axs_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseForeignExchangeAndOther 14,501axs_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseForeignExchangeAndOther
Net reserve for unpaid losses and loss expenses, end of period 7,553,643us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseNet 7,783,021us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseNet
Reinsurance recoverable on unpaid losses, end of period 1,889,579us-gaap_ReinsuranceRecoverableForUnpaidClaimsAndClaimsAdjustments 1,884,820us-gaap_ReinsuranceRecoverableForUnpaidClaimsAndClaimsAdjustments
Gross reserve for losses and loss expenses, end of period $ 9,443,222us-gaap_LiabilityForClaimsAndClaimsAdjustmentExpense $ 9,667,841us-gaap_LiabilityForClaimsAndClaimsAdjustmentExpense