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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Statement of Comprehensive Income [Abstract] |  |  |
Net income | $ 804,564 us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest | $ 727,465 us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest | $ 547,241 us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest
Other comprehensive income (loss), net of tax: |  |  |
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
Comprehensive income | $ 641,165 us-gaap_ComprehensiveIncomeNetOfTax | $ 482,668 us-gaap_ComprehensiveIncomeNetOfTax | $ 781,701 us-gaap_ComprehensiveIncomeNetOfTax

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