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Subsequent Events (Details) - USD ($) $ in Thousands |  | 1 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jan. 01, 2018 | Feb. 02, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Upsilon RFO Re Ltd. | Primary Beneficiary | Non-voting preference shares |  |  |  |
Subsequent Event [Line Items] |  |  |  |
Non-voting preference shares issued to third parties |  |  | $ 180,600 | $ 166,600
Investment in variable interest entity |  |  | $ 27,200 | $ 55,200
Upsilon RFO Re Ltd. | Primary Beneficiary | RenaissanceRe Holdings Ltd. |  |  |  |
Subsequent Event [Line Items] |  |  |  |
Variable interest entity, ownership percentage |  |  | 20.80% | 28.80%
RenaissanceRe Medici Fund Ltd. |  |  |  |
Subsequent Event [Line Items] |  |  |  |
Noncontrolling interest, value subscribed |  |  | $ 149,182 | $ 79,518
Redemption of shares from redeemable noncontrolling interests |  |  | $ 48,049 | $ 21,729
Redeemable noncontrolling interest, ownership percentage |  |  | 26.80% | 36.50%
Subsequent Event | Upsilon RFO Re Ltd. | Primary Beneficiary |  |  |  |
Subsequent Event [Line Items] |  |  |  |
Variable interest entity, ownership percentage | 14.10% |  |  |
Subsequent Event | Upsilon RFO Re Ltd. | Primary Beneficiary | Non-voting preference shares |  |  |  |
Subsequent Event [Line Items] |  |  |  |
Non-voting preference shares issued to third parties | $ 600,500 |  |  |
Investment in variable interest entity | $ 75,000 |  |  |
Subsequent Event | RenaissanceRe Medici Fund Ltd. |  |  |  |
Subsequent Event [Line Items] |  |  |  |
Redeemable noncontrolling interest, ownership percentage |  | 17.80% |  |
Subsequent Event | RenaissanceRe Medici Fund Ltd. | Third-party investor |  |  |  |
Subsequent Event [Line Items] |  |  |  |
Noncontrolling interest, value subscribed |  | $ 81,000 |  |
Subsequent Event | RenaissanceRe Medici Fund Ltd. | RenaissanceRe Holdings Ltd. |  |  |  |
Subsequent Event [Line Items] |  |  |  |
Redemption of shares from redeemable noncontrolling interests |  | $ 25,000 |  |

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- Definition Represents a sale (new stock issuance) by a subsidiary to noncontrolling interests (third parties, parties directly or indirectly unrelated to parent) during the period. The capital transaction by subsidiary does not result in a loss of control by the parent, but does effect a change in total (consolidated) equity attributable to the parent. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=84161450&loc=SL4573702-111684 + Details
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- Definition Decrease in noncontrolling interest (for example, but not limited to, redeeming or purchasing the interests of noncontrolling shareholders, issuance of shares (interests) by the non-wholly owned subsidiary to the parent entity for other than cash, and a buyback of shares (interest) by the non-wholly owned subsidiary from the noncontrolling interests). + References Reference 1: 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 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 45 -Paragraph 23 -URI http://asc.fasb.org/extlink&oid=96868048&loc=SL4569655-111683 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 45 -Paragraph 24 -URI http://asc.fasb.org/extlink&oid=96868048&loc=SL4616395-111683 + Details
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- Definition Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event. + References No definition available. + Details
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- Definition Percentage of the Variable Interest Entity's (VIE) voting interest owned by (or beneficial interest in) the reporting entity (directly or indirectly). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 50 -Paragraph 5A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=77990344&loc=SL6759159-111685 + Details
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