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Condensed Consolidating Financial Information Provided In Connection With Outstanding Debt Of Subsidiaries (Condensed Consolidating Statement Of Cash Flows) (Details) (USD $) | 6 Months Ended
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Jun. 30, 2014 | Jun. 30, 2013 | Jun. 30, 2014 RenaissanceRe Holdings Ltd. (Parent Guarantor) | Jun. 30, 2013 RenaissanceRe Holdings Ltd. (Parent Guarantor) | Jun. 30, 2014 RenRe North America Holdings Inc. (Subsidiary Issuer) | Jun. 30, 2013 RenRe North America Holdings Inc. (Subsidiary Issuer) | Jun. 30, 2014 Other RenaissanceRe Holdings Ltd. Subsidiaries And Eliminations (Non-Guarantor Subsidiaries) | Jun. 30, 2013 Other RenaissanceRe Holdings Ltd. Subsidiaries And Eliminations (Non-Guarantor Subsidiaries) | Jun. 30, 2014 Series C Preferred Stock | Jun. 30, 2013 Series C Preferred Stock | Jun. 30, 2013 Series C Preferred Stock RenaissanceRe Holdings Ltd. (Parent Guarantor) | Jun. 30, 2013 Series C Preferred Stock RenRe North America Holdings Inc. (Subsidiary Issuer) | Jun. 30, 2013 Series C Preferred Stock Other RenaissanceRe Holdings Ltd. Subsidiaries And Eliminations (Non-Guarantor Subsidiaries) | Jun. 30, 2014 Series D Preferred Stock | Jun. 30, 2013 Series D Preferred Stock | Jun. 30, 2013 Series D Preferred Stock RenaissanceRe Holdings Ltd. (Parent Guarantor) | Jun. 30, 2013 Series D Preferred Stock RenRe North America Holdings Inc. (Subsidiary Issuer) | Jun. 30, 2013 Series D Preferred Stock Other RenaissanceRe Holdings Ltd. Subsidiaries And Eliminations (Non-Guarantor Subsidiaries) | Jun. 30, 2014 Series E Preferred Stock | Jun. 30, 2013 Series E Preferred Stock | Jun. 30, 2013 Series E Preferred Stock RenaissanceRe Holdings Ltd. (Parent Guarantor) | Jun. 30, 2013 Series E Preferred Stock RenRe North America Holdings Inc. (Subsidiary Issuer) | Jun. 30, 2013 Series E Preferred Stock Other RenaissanceRe Holdings Ltd. Subsidiaries And Eliminations (Non-Guarantor Subsidiaries)
Cash flows (used in) provided by operating activities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net cash (used in) provided by operating activities | $ 173,386,000 | $ 177,419,000 | $ (14,828,000) | $ (42,805,000) | $ (8,410,000) | $ (20,926,000) | $ 196,624,000 | [1] | $ 241,150,000 | [1] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash flows provided by investing activities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from sales and maturities of fixed maturity investments trading | 4,020,174,000 | 4,448,449,000 | 4,912,000 | 409,514,000 | 5,353,000 | 64,535,000 | 4,009,909,000 | [1] | 3,974,400,000 | [1] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchases of fixed maturity investments trading | (3,970,317,000) | (4,225,188,000) | (79,714,000) | (20,604,000) | 0 | (43,799,000) | (3,890,603,000) | [1] | (4,160,785,000) | [1] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from sales and maturities of fixed maturity investments available for sale | 5,114,000 | 41,338,000 | 0 | 0 | 0 | 0 | 5,114,000 | [1] | 41,338,000 | [1] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net purchases of equity investments trading | (11,146,000) | (35,958,000) | 0 | 0 | (370,000) | 0 | (10,776,000) | [1] | (35,958,000) | [1] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net sales (purchases) of short term investments | 89,549,000 | (110,562,000) | 116,511,000 | 98,000,000 | (68,000) | 10,396,000 | (26,894,000) | [1] | (218,958,000) | [1] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net sales of other investments | 68,684,000 | 42,935,000 | 0 | 0 | 0 | 0 | 68,684,000 | [1] | 42,935,000 | [1] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net sales (purchases) of investments in other ventures | 1,030,000 | (2,500,000) | 0 | 0 | 0 | 0 | 1,030,000 | [1] | (2,500,000) | [1] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net sales of other assets | 6,000,000 | 598,000 | 0 | 0 | 0 | 0 | 6,000,000 |  | 598,000 | [1] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends and return of capital from subsidiaries | 0 | 0 | 359,891,000 | 128,922,000 | 5,406,000 | 4,806,000 | (365,297,000) | [1] | (133,728,000) | [1] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Contributions to subsidiaries | 0 | 0 | (47,220,000) | (296,179,000) | (1,950,000) | (12,625,000) | 49,170,000 | [1] | 308,804,000 | [1] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Due to (from) subsidiary | 0 | 0 | 4,123,000 | (11,753,000) | (777,000) | 339,000 | (3,346,000) | [1] | 11,414,000 | [1] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net cash provided by investing activities | 209,088,000 | 159,112,000 | 358,503,000 | 307,900,000 | 7,594,000 | 23,652,000 | (157,009,000) | [1] | (172,440,000) | [1] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash flows provided by (used in) financing activities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends paid – RenaissanceRe common shares | (23,550,000) | (24,658,000) | (23,550,000) | (24,658,000) | 0 | 0 | 0 | [1] | 0 | [1] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends paid – preference shares | (11,191,000) | (13,758,000) | (11,191,000) | (13,758,000) | 0 | 0 | 0 | [1] | 0 | [1] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
RenaissanceRe common share repurchases | (314,536,000) | (121,996,000) | (314,536,000) | (121,996,000) | 0 | 0 | 0 | [1] | 0 | [1] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net (repayment) drawdown of debt | 0 | (101,410,000) |  | (100,000,000) |  | 0 |  |  | (1,410,000) | [1] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Redemption of preference stock |  |  |  |  |  |  |  |  |  |  | 0 | (125,000,000) | (125,000,000) | 0 | 0 | [1] | 0 | (150,000,000) | (150,000,000) | 0 | 0 | [1] |  |  |  |  |  |
Issuance of 5.375% Series E preference shares, net of expenses |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 265,655,000 | 265,655,000 | 0 | 0 | [1]
Net third party redeemable noncontrolling interest share transactions | (144,096,000) | (105,633,000) | 0 | 0 | 0 | 0 | (144,096,000) | [1] | (105,633,000) | [1] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net cash used in financing activities | (493,373,000) | (376,800,000) | (349,277,000) | (269,757,000) | 0 | 0 | (144,096,000) | [1] | (107,043,000) | [1] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Effect of exchange rate changes on foreign currency cash | (2,676,000) | 505,000 | 0 | 0 | 0 | 0 | (2,676,000) | [1] | 505,000 | [1] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net (decrease) increase in cash and cash equivalents | (113,575,000) | (39,764,000) | (5,602,000) | (4,662,000) | (816,000) | 2,726,000 | (107,157,000) | [1] | (37,828,000) | [1] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net increase in cash and cash equivalents of discontinued operations | 0 | (29,475,000) |  | 0 |  | 0 |  |  | (29,475,000) | [1] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash and cash equivalents, beginning of period | 408,032,000 | 304,145,000 | 8,796,000 | 6,298,000 | 4,027,000 | 1,528,000 | 395,209,000 | [1] | 296,319,000 | [1] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash and cash equivalents, end of period | $ 294,457,000 | $ 234,906,000 | $ 3,194,000 | $ 1,636,000 | $ 3,211,000 | $ 4,254,000 | $ 288,052,000 | [1] | $ 229,016,000 | [1] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
[1] | Includes all other subsidiaries of RenaissanceRe Holdings Ltd. and eliminations.

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- Definition Proceeds from issuance of capital stock which provides for a specific dividend that is paid to the shareholders before any dividends to common stockholders and which takes precedence over common stockholders in the event of liquidation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3255-108585 + Details
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- Definition Amount of cash inflow (outflow) from sales and purchases of trading securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26853-111562 + Details
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- Definition The net cash inflow or outflow in aggregate debt due to repayments and proceeds from additional borrowings. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 + Details
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- Definition The cash inflow associated with the sale or maturity (principal being due) of securities not classified as either held-to-maturity securities or trading securities which are classified as available-for-sale securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26853-111562 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (a),(b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3179-108585 + Details
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- Definition The cash inflow associated with the sale, maturities, repayments and calls of securities classified as trading securities and held for investment purposes. Excludes proceeds from trading securities purchased and held principally for the purpose of selling them in the near term (thus held for only a short period of time). + References No definition available. + Details
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