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OTHER COMPREHENSIVE INCOME (LOSS) (DETAILS) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Before Tax Amount |  |  |
Unrealized investment gains (losses) arising during the year | $ (22,704)us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax | $ (169,614)us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax | $ 378,040 us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax
Adjustment for reclassification of net realized investment gains and OTTI losses recognized in net income | (141,172)axs_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesAndWritedownOfSecuritiesBeforeTax | (67,156)axs_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesAndWritedownOfSecuritiesBeforeTax | (127,828)axs_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesAndWritedownOfSecuritiesBeforeTax
Unrealized investment gains (losses) arising during the year, net of reclassification adjustment | (163,876)us-gaap_OtherComprehensiveIncomeAvailableforsaleSecuritiesAdjustmentBeforeTaxPortionAttributableToParent | (236,770)us-gaap_OtherComprehensiveIncomeAvailableforsaleSecuritiesAdjustmentBeforeTaxPortionAttributableToParent | 250,212 us-gaap_OtherComprehensiveIncomeAvailableforsaleSecuritiesAdjustmentBeforeTaxPortionAttributableToParent
Non-credit portion of OTTI losses | 0 us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionInOtherComprehensiveIncomeLossBeforeTaxPortionAttributableToParentAvailableforsaleSecurities | 0 us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionInOtherComprehensiveIncomeLossBeforeTaxPortionAttributableToParentAvailableforsaleSecurities | 0 us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionInOtherComprehensiveIncomeLossBeforeTaxPortionAttributableToParentAvailableforsaleSecurities
Foreign currency translation adjustment | (10,262)us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentBeforeTaxPortionAttributableToParent | (21,414)us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentBeforeTaxPortionAttributableToParent | 510 us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentBeforeTaxPortionAttributableToParent
Net change in benefit plan assets and obligations recognized in equity and reclassification adjustment |  |  | 1,718 us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentBeforeTaxPortionAttributableToParent
Total other comprehensive income (loss) | (174,138)us-gaap_OtherComprehensiveIncomeLossBeforeTaxPortionAttributableToParent | (258,184)us-gaap_OtherComprehensiveIncomeLossBeforeTaxPortionAttributableToParent | 252,440 us-gaap_OtherComprehensiveIncomeLossBeforeTaxPortionAttributableToParent
Tax (Expense) Benefit |  |  |
Unrealized investment gains (losses) arising during the year | (15,963)us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax | 7,782 us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax | (29,530)us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax
Adjustment for reclassification of net realized investment gains and OTTI losses recognized in net income | 26,702 axs_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesAndWritedownOfSecuritiesTax | 5,605 axs_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesAndWritedownOfSecuritiesTax | 11,550 axs_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesAndWritedownOfSecuritiesTax
Unrealized investment gains (losses) arising during the year, net of reclassification adjustment | 10,739 us-gaap_OtherComprehensiveIncomeAvailableforsaleSecuritiesTaxPortionAttributableToParent | 13,387 us-gaap_OtherComprehensiveIncomeAvailableforsaleSecuritiesTaxPortionAttributableToParent | (17,980)us-gaap_OtherComprehensiveIncomeAvailableforsaleSecuritiesTaxPortionAttributableToParent
Non-credit portion of OTTI losses | 0 us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionInOtherComprehensiveIncomeLossTaxPortionAttributableToParentAvailableforsaleSecurities | 0 us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionInOtherComprehensiveIncomeLossTaxPortionAttributableToParentAvailableforsaleSecurities | 0 us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionInOtherComprehensiveIncomeLossTaxPortionAttributableToParentAvailableforsaleSecurities
Foreign currency translation adjustment | 0 us-gaap_OtherComprehensiveIncomeForeignCurrencyTranslationAdjustmentTaxPortionAttributableToParent | 0 us-gaap_OtherComprehensiveIncomeForeignCurrencyTranslationAdjustmentTaxPortionAttributableToParent | 0 us-gaap_OtherComprehensiveIncomeForeignCurrencyTranslationAdjustmentTaxPortionAttributableToParent
Net change in benefit plan assets and obligations recognized in equity and reclassification adjustment |  |  | 0 us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansTaxPortionAttributableToParent
Total other comprehensive income (loss) | 10,739 us-gaap_OtherComprehensiveIncomeLossTaxPortionAttributableToParent1 | 13,387 us-gaap_OtherComprehensiveIncomeLossTaxPortionAttributableToParent1 | (17,980)us-gaap_OtherComprehensiveIncomeLossTaxPortionAttributableToParent1
Net of Tax Amount |  |  |
Unrealized investment gains (losses) arising during the year | (38,667)us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax | (161,832)us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax | 348,510 us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax
Adjustment for reclassification of net realized investment gains and OTTI losses recognized in net income | (114,470)axs_OtherComprehensiveIncomeLossReclassifcationAdjustmentFromAOCIForSaleOfSecuritiesAndWritedownOfSecuritiesNetOfTax | (61,551)axs_OtherComprehensiveIncomeLossReclassifcationAdjustmentFromAOCIForSaleOfSecuritiesAndWritedownOfSecuritiesNetOfTax | (116,278)axs_OtherComprehensiveIncomeLossReclassifcationAdjustmentFromAOCIForSaleOfSecuritiesAndWritedownOfSecuritiesNetOfTax
Unrealized investment gains (losses) arising during the year, net of reclassification adjustment | (153,137)us-gaap_OtherComprehensiveIncomeAvailableforsaleSecuritiesAdjustmentNetOfTaxPortionAttributableToParent | (223,383)us-gaap_OtherComprehensiveIncomeAvailableforsaleSecuritiesAdjustmentNetOfTaxPortionAttributableToParent | 232,232 us-gaap_OtherComprehensiveIncomeAvailableforsaleSecuritiesAdjustmentNetOfTaxPortionAttributableToParent
Non-credit portion of OTTI losses | 0 us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionInOtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParentAvailableforsaleSecurities | 0 us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionInOtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParentAvailableforsaleSecurities | 0 us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionInOtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParentAvailableforsaleSecurities
Foreign currency translation adjustment | (10,262)us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToParent | (21,414)us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToParent | 510 us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToParent
Net change in benefit plan assets and obligations recognized in equity and reclassification adjustment | 0 us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentNetOfTaxPortionAttributableToParent | 0 us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentNetOfTaxPortionAttributableToParent | 1,718 us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentNetOfTaxPortionAttributableToParent
Total other comprehensive income (loss), net of tax | $ (163,399)us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent | $ (244,797)us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent | $ 234,460 us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent

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