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Goodwill and Other Intangible Assets (Schedule of Goodwill and Other Intangible Assets Included in Equity Method Investments) (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013
Other intangible assets |  |
Gross amount, End of Period | $ 58,399 us-gaap_IntangibleAssetsGrossExcludingGoodwill | $ 58,477 us-gaap_IntangibleAssetsGrossExcludingGoodwill
Accumulated impairment losses and amortization, End of Period | (43,424)rnr_IntangibleAssetsExcludingGoodwillAccumulatedAmortizationAndImpairment | (39,560)rnr_IntangibleAssetsExcludingGoodwillAccumulatedAmortizationAndImpairment
Other intangible assets, Net, End of Period | 14,975 us-gaap_IntangibleAssetsNetExcludingGoodwill | 18,917 us-gaap_IntangibleAssetsNetExcludingGoodwill
Goodwill and Other intangible assets, Total |  |
Goodwill and Other intangible assets, Net, End of Period | 7,902 us-gaap_IntangibleAssetsNetIncludingGoodwill | 8,111 us-gaap_IntangibleAssetsNetIncludingGoodwill
Investments in other ventures |  |
Goodwill |  |
Goodwill, Gross amount, Beginning of Period | 12,545 us-gaap_GoodwillGross / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = us-gaap_EquityMethodInvestmentsMember | 10,840 us-gaap_GoodwillGross / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = us-gaap_EquityMethodInvestmentsMember
Accumulated impairment losses and amortization, Beginning of Period | 0 us-gaap_GoodwillImpairedAccumulatedImpairmentLoss / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = us-gaap_EquityMethodInvestmentsMember | 0 us-gaap_GoodwillImpairedAccumulatedImpairmentLoss / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = us-gaap_EquityMethodInvestmentsMember
Goodwill, Net, Beginning of Period | 12,545 us-gaap_Goodwill / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = us-gaap_EquityMethodInvestmentsMember | 10,840 us-gaap_Goodwill / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = us-gaap_EquityMethodInvestmentsMember
Acquired during the year |  | 1,705 us-gaap_GoodwillAcquiredDuringPeriod / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = us-gaap_EquityMethodInvestmentsMember
Adjustments to gross amounts | (227)us-gaap_GoodwillOtherChanges / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = us-gaap_EquityMethodInvestmentsMember |
Goodwill, Gross amount, End of Period | 12,318 us-gaap_GoodwillGross / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = us-gaap_EquityMethodInvestmentsMember | 12,545 us-gaap_GoodwillGross / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = us-gaap_EquityMethodInvestmentsMember
Accumulated impairment losses and amortization, End of Period | 0 us-gaap_GoodwillImpairedAccumulatedImpairmentLoss / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = us-gaap_EquityMethodInvestmentsMember | 0 us-gaap_GoodwillImpairedAccumulatedImpairmentLoss / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = us-gaap_EquityMethodInvestmentsMember
Goodwill, Net, End of Period | 12,318 us-gaap_Goodwill / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = us-gaap_EquityMethodInvestmentsMember | 12,545 us-gaap_Goodwill / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = us-gaap_EquityMethodInvestmentsMember
Other intangible assets |  |
Gross amount, Beginning of Period | 45,478 us-gaap_IntangibleAssetsGrossExcludingGoodwill / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = us-gaap_EquityMethodInvestmentsMember | 44,323 us-gaap_IntangibleAssetsGrossExcludingGoodwill / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = us-gaap_EquityMethodInvestmentsMember
Accumulated impairment losses and amortization, Beginning of Period | (28,811)rnr_IntangibleAssetsExcludingGoodwillAccumulatedAmortizationAndImpairment / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = us-gaap_EquityMethodInvestmentsMember | (24,769)rnr_IntangibleAssetsExcludingGoodwillAccumulatedAmortizationAndImpairment / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = us-gaap_EquityMethodInvestmentsMember
Other intangible assets, Net, Beginning of Period | 16,667 us-gaap_IntangibleAssetsNetExcludingGoodwill / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = us-gaap_EquityMethodInvestmentsMember | 19,554 us-gaap_IntangibleAssetsNetExcludingGoodwill / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = us-gaap_EquityMethodInvestmentsMember
Acquired during the year |  | 1,155 us-gaap_FinitelivedIntangibleAssetsAcquired1 / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = us-gaap_EquityMethodInvestmentsMember
Amortization | (3,655)us-gaap_AmortizationOfIntangibleAssets / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = us-gaap_EquityMethodInvestmentsMember | (4,042)us-gaap_AmortizationOfIntangibleAssets / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = us-gaap_EquityMethodInvestmentsMember
Adjustments to gross amounts | (78)rnr_IntangibleAssetsOtherChanges / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = us-gaap_EquityMethodInvestmentsMember |
Gross amount, End of Period | 45,400 us-gaap_IntangibleAssetsGrossExcludingGoodwill / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = us-gaap_EquityMethodInvestmentsMember | 45,478 us-gaap_IntangibleAssetsGrossExcludingGoodwill / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = us-gaap_EquityMethodInvestmentsMember
Accumulated impairment losses and amortization, End of Period | (32,466)rnr_IntangibleAssetsExcludingGoodwillAccumulatedAmortizationAndImpairment / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = us-gaap_EquityMethodInvestmentsMember | (28,811)rnr_IntangibleAssetsExcludingGoodwillAccumulatedAmortizationAndImpairment / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = us-gaap_EquityMethodInvestmentsMember
Other intangible assets, Net, End of Period | 12,934 us-gaap_IntangibleAssetsNetExcludingGoodwill / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = us-gaap_EquityMethodInvestmentsMember | 16,667 us-gaap_IntangibleAssetsNetExcludingGoodwill / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = us-gaap_EquityMethodInvestmentsMember
Goodwill and Other intangible assets, Total |  |
Gross amount, Beginning of Period | 58,023 rnr_GoodwillAndIntangibleAssetsGross / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = us-gaap_EquityMethodInvestmentsMember | 55,163 rnr_GoodwillAndIntangibleAssetsGross / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = us-gaap_EquityMethodInvestmentsMember
Accumulated impairment losses and amortization, Beginning of Period | (28,811)rnr_GoodwillAndIntangibleAssetsAccumulatedImpairmentAndAmortization / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = us-gaap_EquityMethodInvestmentsMember | (24,769)rnr_GoodwillAndIntangibleAssetsAccumulatedImpairmentAndAmortization / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = us-gaap_EquityMethodInvestmentsMember
Goodwill and Other intangible assets, Net, Beginning of Period | 29,212 us-gaap_IntangibleAssetsNetIncludingGoodwill / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = us-gaap_EquityMethodInvestmentsMember | 30,394 us-gaap_IntangibleAssetsNetIncludingGoodwill / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = us-gaap_EquityMethodInvestmentsMember
Acquired during the year |  | 2,860 rnr_GoodwillAndIntangibleAssetsAcquiredDuringPeriod / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = us-gaap_EquityMethodInvestmentsMember
Amortization | (3,655)us-gaap_AdjustmentForAmortization / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = us-gaap_EquityMethodInvestmentsMember | (4,042)us-gaap_AdjustmentForAmortization / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = us-gaap_EquityMethodInvestmentsMember
Adjustments to gross amounts | 305 rnr_IntangibleAssetsNetIncludingGoodwillOtherChanges / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = us-gaap_EquityMethodInvestmentsMember |
Gross amount, End of Period | 57,718 rnr_GoodwillAndIntangibleAssetsGross / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = us-gaap_EquityMethodInvestmentsMember | 58,023 rnr_GoodwillAndIntangibleAssetsGross / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = us-gaap_EquityMethodInvestmentsMember
Accumulated impairment losses and amortization, End of Period | (32,466)rnr_GoodwillAndIntangibleAssetsAccumulatedImpairmentAndAmortization / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = us-gaap_EquityMethodInvestmentsMember | (28,811)rnr_GoodwillAndIntangibleAssetsAccumulatedImpairmentAndAmortization / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = us-gaap_EquityMethodInvestmentsMember
Goodwill and Other intangible assets, Net, End of Period | $ 25,252 us-gaap_IntangibleAssetsNetIncludingGoodwill / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = us-gaap_EquityMethodInvestmentsMember | $ 29,212 us-gaap_IntangibleAssetsNetIncludingGoodwill / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = us-gaap_EquityMethodInvestmentsMember

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- Definition Goodwill and Intangible Assets, Accumulated Impairment and Amortization + References No definition available. + Details
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- Definition Goodwill and Intangible Assets, Acquired During Period + References No definition available. + Details
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- Definition Goodwill and Intangible Assets, Gross + References No definition available. + Details
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- Definition Intangible Assets (Excluding Goodwill), Accumulated Amortization and Impairment + References No definition available. + Details
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- Definition Intangible Assets, Net (Including Goodwill), Other Changes + References No definition available. + Details
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- Definition The aggregate amount of recurring noncash expense charged against earnings in the period to allocate the cost of assets over their estimated remaining economic lives. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 + Details
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- Definition The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16225-109274 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 + Details
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- Definition Amount of increase in assets, excluding financial assets, lacking physical substance with a definite life, resulting from a business combination. + References No definition available. + Details
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- Definition Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266 + Details
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- Definition Amount of increase in asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized resulting from a business combination. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 + Details
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- Definition Amount before accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a,h) -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 + Details
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- Definition Amount of accumulated impairment loss for an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a,h) -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 + Details
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- Definition Amount of other (increase) decrease of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 + Details
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- Definition Amount before accumulated amortization of intangible assets, excluding goodwill. + References No definition available. + Details
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- Definition Sum of the carrying amounts of all intangible assets, excluding goodwill, as of the balance sheet date, net of accumulated amortization and impairment charges. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16212-109274 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph ((a)(1),(b)) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 + Details
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- Definition Carrying amount of finite-lived intangible assets, indefinite-lived intangible assets and goodwill. Goodwill is an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. Intangible assets are assets, not including financial assets, lacking physical substance. + References No definition available. + Details
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