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INVESTMENTS (DETAILS 9) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Schedule Of Available For Sale Securities [Line Items] |  |  |
Fair Value (fixed maturities) | $ 12,129,273 us-gaap_AvailableForSaleSecuritiesDebtSecurities | $ 11,986,327 us-gaap_AvailableForSaleSecuritiesDebtSecurities |
Decrease in credit loss impairments due to maturity | 63 us-gaap_OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsReductionsSecuritiesSold | 215 us-gaap_OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsReductionsSecuritiesSold |
Realized gains on maturity | 275,806 us-gaap_AvailableForSaleSecuritiesGrossRealizedGains | 175,496 us-gaap_AvailableForSaleSecuritiesGrossRealizedGains | 278,493 us-gaap_AvailableForSaleSecuritiesGrossRealizedGains
Non-US Government [Member] |  |  |
Schedule Of Available For Sale Securities [Line Items] |  |  |
Fair Value (fixed maturities) | 1,033,543 us-gaap_AvailableForSaleSecuritiesDebtSecurities / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_ForeignGovernmentDebtSecuritiesMember | 1,176,382 us-gaap_AvailableForSaleSecuritiesDebtSecurities / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_ForeignGovernmentDebtSecuritiesMember |
Non-US Government [Member] | eurozone [Member] |  |  |
Schedule Of Available For Sale Securities [Line Items] |  |  |
Fair Value (fixed maturities) | 119,000 us-gaap_AvailableForSaleSecuritiesDebtSecurities / invest_InvestmentGeographicRegionAxis = axs_EurozoneMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_ForeignGovernmentDebtSecuritiesMember | 161,000 us-gaap_AvailableForSaleSecuritiesDebtSecurities / invest_InvestmentGeographicRegionAxis = axs_EurozoneMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_ForeignGovernmentDebtSecuritiesMember |
CMBS [Member] |  |  |
Schedule Of Available For Sale Securities [Line Items] |  |  |
Fair Value (fixed maturities) | 1,096,888 us-gaap_AvailableForSaleSecuritiesDebtSecurities / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CommercialMortgageBackedSecuritiesMember | 797,414 us-gaap_AvailableForSaleSecuritiesDebtSecurities / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CommercialMortgageBackedSecuritiesMember |
CMBS [Member] | Weighted Average [Member] |  |  |
Schedule Of Available For Sale Securities [Line Items] |  |  |
Subordination percentage input for determining credit losses | 30.00%axs_OtherThanTemporaryImpairmentLossesInvestmentsAvailableForSaleSecuritiesPortionRecognizedInEarningsNetQualitativeDisclosuresLevelOfSubordinationPercentage / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CommercialMortgageBackedSecuritiesMember / us-gaap_RangeAxis = us-gaap_WeightedAverageMember | 30.00%axs_OtherThanTemporaryImpairmentLossesInvestmentsAvailableForSaleSecuritiesPortionRecognizedInEarningsNetQualitativeDisclosuresLevelOfSubordinationPercentage / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CommercialMortgageBackedSecuritiesMember / us-gaap_RangeAxis = us-gaap_WeightedAverageMember |
Non-Agency RMBS [Member] |  |  |
Schedule Of Available For Sale Securities [Line Items] |  |  |
Fair Value (fixed maturities) | 73,086 us-gaap_AvailableForSaleSecuritiesDebtSecurities / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_MortgageBackedSecuritiesIssuedByPrivateEnterprisesMember | 67,567 us-gaap_AvailableForSaleSecuritiesDebtSecurities / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_MortgageBackedSecuritiesIssuedByPrivateEnterprisesMember |
Non-Agency RMBS [Member] | Prime [Member] |  |  |
Schedule Of Available For Sale Securities [Line Items] |  |  |
Fair Value (fixed maturities) | 49,000 us-gaap_AvailableForSaleSecuritiesDebtSecurities / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_MortgageBackedSecuritiesIssuedByPrivateEnterprisesMember / axs_ResidentialMortgageCreditTypeAxis = axs_PrimeMember | 41,000 us-gaap_AvailableForSaleSecuritiesDebtSecurities / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_MortgageBackedSecuritiesIssuedByPrivateEnterprisesMember / axs_ResidentialMortgageCreditTypeAxis = axs_PrimeMember |
Non-Agency RMBS [Member] | Alt A [Member] |  |  |
Schedule Of Available For Sale Securities [Line Items] |  |  |
Fair Value (fixed maturities) | $ 17,000 us-gaap_AvailableForSaleSecuritiesDebtSecurities / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_MortgageBackedSecuritiesIssuedByPrivateEnterprisesMember / axs_ResidentialMortgageCreditTypeAxis = axs_AltaMember | $ 19,000 us-gaap_AvailableForSaleSecuritiesDebtSecurities / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_MortgageBackedSecuritiesIssuedByPrivateEnterprisesMember / axs_ResidentialMortgageCreditTypeAxis = axs_AltaMember |

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- Definition This item represents the current level of subordination of the entity's receipt of consideration should the assets underlying the security be liquidated when the level of subordination was considered as one of the potential factors in reaching a conclusion that the available-for-sale investments are other than temporarily impaired and the amount of such impairment determined to be related to credit loss recognized in earnings. + References No definition available. + Details
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- Definition Amount of debt securities categorized neither as held-to-maturity nor trading. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=28360136&loc=d3e22054-111558 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27161-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26610-111562 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -Section 50 -Paragraph 2 -Subparagraph (b)-(g) -URI http://asc.fasb.org/extlink&oid=6957658&loc=d3e62557-112803 + Details
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- Definition This item represents the gross profit realized on the sale of debt or equity securities categorized neither as held-to-maturity nor trading securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27357-111563 + Details
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- Definition This item represents reductions in the cumulative amount of credit losses recognized in earnings for an other than temporary impairment (OTTI) of a debt security because of the sale of impaired securities during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 8 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27340-111563 + Details
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