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INVESTMENTS (DETAILS 5) (USD $) In Thousands, unless otherwise specified | 3 Months Ended
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Mar. 31, 2015 | Mar. 31, 2014
Net Investment Income [Line Items] |  |
Gross investment income | $ 99,883 axs_InvestmentIncomeForInvestmentsAndCashAndCashEquivalents | $ 93,080 axs_InvestmentIncomeForInvestmentsAndCashAndCashEquivalents
Investment expenses | (7,773)us-gaap_InvestmentIncomeInvestmentExpense | (10,336)us-gaap_InvestmentIncomeInvestmentExpense
Net investment income | 92,110 axs_InvestmentIncomeNetForInvestmentsAndCashAndCashEquivalents | 82,744 axs_InvestmentIncomeNetForInvestmentsAndCashAndCashEquivalents
Fixed Maturities [Member] |  |
Net Investment Income [Line Items] |  |
Gross investment income | 66,101 axs_InvestmentIncomeForInvestmentsAndCashAndCashEquivalents / us-gaap_InvestmentTypeAxis = us-gaap_FixedMaturitiesMember | 72,957 axs_InvestmentIncomeForInvestmentsAndCashAndCashEquivalents / us-gaap_InvestmentTypeAxis = us-gaap_FixedMaturitiesMember
Other Investments [Member] |  |
Net Investment Income [Line Items] |  |
Gross investment income | 30,935 axs_InvestmentIncomeForInvestmentsAndCashAndCashEquivalents / us-gaap_InvestmentTypeAxis = axs_AlternativeInvestmentsMember | 16,760 axs_InvestmentIncomeForInvestmentsAndCashAndCashEquivalents / us-gaap_InvestmentTypeAxis = axs_AlternativeInvestmentsMember
Equity Securities [Member] |  |
Net Investment Income [Line Items] |  |
Gross investment income | 1,676 axs_InvestmentIncomeForInvestmentsAndCashAndCashEquivalents / us-gaap_InvestmentTypeAxis = us-gaap_EquitySecuritiesMember | 2,286 axs_InvestmentIncomeForInvestmentsAndCashAndCashEquivalents / us-gaap_InvestmentTypeAxis = us-gaap_EquitySecuritiesMember
Cash And Cash Equivalents [Member] |  |
Net Investment Income [Line Items] |  |
Gross investment income | 1,102 axs_InvestmentIncomeForInvestmentsAndCashAndCashEquivalents / us-gaap_InvestmentTypeAxis = us-gaap_CashAndCashEquivalentsMember | 863 axs_InvestmentIncomeForInvestmentsAndCashAndCashEquivalents / us-gaap_InvestmentTypeAxis = us-gaap_CashAndCashEquivalentsMember
Short-term Investments [Member] |  |
Net Investment Income [Line Items] |  |
Gross investment income | $ 69 axs_InvestmentIncomeForInvestmentsAndCashAndCashEquivalents / us-gaap_InvestmentTypeAxis = us-gaap_ShortTermInvestmentsMember | $ 214 axs_InvestmentIncomeForInvestmentsAndCashAndCashEquivalents / us-gaap_InvestmentTypeAxis = us-gaap_ShortTermInvestmentsMember

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- Definition The net gain or loss (both realized and unrealized) related to investments in certain entities that calculate net asset value per share and the amount after accretion (amortization) of discount (premium), of interest income and dividend income on nonoperating securities. + References No definition available. + Details
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- Definition The net gain or loss (both realized and unrealized) related to investments in certain entities that calculate net asset value per share and the amount after accretion (amortization) of discount (premium) of interest income and dividend income on nonoperating securities, net of investment expense. + References No definition available. + Details
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- Definition Amount of expenses related to the generation of investment income. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04.2) -URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.9) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 + Details
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