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SHAREHOLDERS' EQUITY (DETAILS 2) (Common Stock [Member], USD $) In Thousands, except Per Share data, unless otherwise specified | 3 Months Ended
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Mar. 31, 2015 | Mar. 31, 2014
Treasury Shares [Line Items] |  |
Total shares | 290 us-gaap_TreasuryStockSharesAcquired | 4,036 us-gaap_TreasuryStockSharesAcquired
Total cost | $ 14,771 us-gaap_TreasuryStockValueAcquiredCostMethod | $ 178,703 us-gaap_TreasuryStockValueAcquiredCostMethod
Average price per share | $ 50.95 us-gaap_TreasuryStockAcquiredAverageCostPerShare | $ 44.27 us-gaap_TreasuryStockAcquiredAverageCostPerShare
In the Open Market [Member] |  |
Treasury Shares [Line Items] |  |
Total shares | 16 us-gaap_TreasuryStockSharesAcquired / axs_ShareRepurchaseTypeAxis = axs_OpenMarketMember / us-gaap_StatementClassOfStockAxis = us-gaap_CommonStockMember | 3,710 us-gaap_TreasuryStockSharesAcquired / axs_ShareRepurchaseTypeAxis = axs_OpenMarketMember / us-gaap_StatementClassOfStockAxis = us-gaap_CommonStockMember
Total cost | 832 us-gaap_TreasuryStockValueAcquiredCostMethod / axs_ShareRepurchaseTypeAxis = axs_OpenMarketMember / us-gaap_StatementClassOfStockAxis = us-gaap_CommonStockMember | 164,606 us-gaap_TreasuryStockValueAcquiredCostMethod / axs_ShareRepurchaseTypeAxis = axs_OpenMarketMember / us-gaap_StatementClassOfStockAxis = us-gaap_CommonStockMember
Average price per share | $ 50.69 us-gaap_TreasuryStockAcquiredAverageCostPerShare / axs_ShareRepurchaseTypeAxis = axs_OpenMarketMember / us-gaap_StatementClassOfStockAxis = us-gaap_CommonStockMember | $ 44.37 us-gaap_TreasuryStockAcquiredAverageCostPerShare / axs_ShareRepurchaseTypeAxis = axs_OpenMarketMember / us-gaap_StatementClassOfStockAxis = us-gaap_CommonStockMember
From Employees [Member] |  |
Treasury Shares [Line Items] |  |
Total shares | 274 us-gaap_TreasuryStockSharesAcquired / axs_ShareRepurchaseTypeAxis = axs_EmployeesMember / us-gaap_StatementClassOfStockAxis = us-gaap_CommonStockMember | 326 us-gaap_TreasuryStockSharesAcquired / axs_ShareRepurchaseTypeAxis = axs_EmployeesMember / us-gaap_StatementClassOfStockAxis = us-gaap_CommonStockMember
Total cost | $ 13,939 us-gaap_TreasuryStockValueAcquiredCostMethod / axs_ShareRepurchaseTypeAxis = axs_EmployeesMember / us-gaap_StatementClassOfStockAxis = us-gaap_CommonStockMember | $ 14,097 us-gaap_TreasuryStockValueAcquiredCostMethod / axs_ShareRepurchaseTypeAxis = axs_EmployeesMember / us-gaap_StatementClassOfStockAxis = us-gaap_CommonStockMember
Average price per share | $ 50.97 us-gaap_TreasuryStockAcquiredAverageCostPerShare / axs_ShareRepurchaseTypeAxis = axs_EmployeesMember / us-gaap_StatementClassOfStockAxis = us-gaap_CommonStockMember | $ 43.14 us-gaap_TreasuryStockAcquiredAverageCostPerShare / axs_ShareRepurchaseTypeAxis = axs_EmployeesMember / us-gaap_StatementClassOfStockAxis = us-gaap_CommonStockMember

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- Definition Total cost of shares repurchased divided by the total number of shares repurchased. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6405813&loc=d3e23239-112655 + Details
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- Definition Number of shares that have been repurchased during the period and are being held in treasury. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29, 30 -Article 5 + Details
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- Definition Equity impact of the cost of common and preferred stock that were repurchased during the period. Recorded using the cost method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6405813&loc=d3e23239-112655 + Details
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