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Goodwill and Other Intangible Assets (Schedule of Finite-Lived Intangible Assets by Major Class) (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended |
--- | --- | ---
Dec. 31, 2014 | Dec. 31, 2013
Schedule of Finite and Indefinite-lived Intangible Assets [Line Items] |  |
Gross carrying value | 58,399 us-gaap_IntangibleAssetsGrossExcludingGoodwill | $ 58,477 us-gaap_IntangibleAssetsGrossExcludingGoodwill
Accumulated amortization and impairment losses | (43,424)rnr_IntangibleAssetsExcludingGoodwillAccumulatedAmortizationAndImpairment | (39,560)rnr_IntangibleAssetsExcludingGoodwillAccumulatedAmortizationAndImpairment
Other intangible assets, Net | 14,975 us-gaap_IntangibleAssetsNetExcludingGoodwill | 18,917 us-gaap_IntangibleAssetsNetExcludingGoodwill
Customer relationships and customer lists |  |
Schedule of Finite and Indefinite-lived Intangible Assets [Line Items] |  |
Gross carrying value | 40,562 us-gaap_IntangibleAssetsGrossExcludingGoodwill / rnr_FiniteAndIndefiniteLivedIntangibleAssetsAxis = us-gaap_CustomerRelationshipsMember | 40,640 us-gaap_IntangibleAssetsGrossExcludingGoodwill / rnr_FiniteAndIndefiniteLivedIntangibleAssetsAxis = us-gaap_CustomerRelationshipsMember
Accumulated amortization and impairment losses | (28,057)rnr_IntangibleAssetsExcludingGoodwillAccumulatedAmortizationAndImpairment / rnr_FiniteAndIndefiniteLivedIntangibleAssetsAxis = us-gaap_CustomerRelationshipsMember | (24,522)rnr_IntangibleAssetsExcludingGoodwillAccumulatedAmortizationAndImpairment / rnr_FiniteAndIndefiniteLivedIntangibleAssetsAxis = us-gaap_CustomerRelationshipsMember
Other intangible assets, Net | 12,505 us-gaap_IntangibleAssetsNetExcludingGoodwill / rnr_FiniteAndIndefiniteLivedIntangibleAssetsAxis = us-gaap_CustomerRelationshipsMember | 16,118 us-gaap_IntangibleAssetsNetExcludingGoodwill / rnr_FiniteAndIndefiniteLivedIntangibleAssetsAxis = us-gaap_CustomerRelationshipsMember
Lloyd's managing agency license |  |
Schedule of Finite and Indefinite-lived Intangible Assets [Line Items] |  |
Gross carrying value | 1,867 us-gaap_IntangibleAssetsGrossExcludingGoodwill / rnr_FiniteAndIndefiniteLivedIntangibleAssetsAxis = us-gaap_LicensingAgreementsMember | 1,867 us-gaap_IntangibleAssetsGrossExcludingGoodwill / rnr_FiniteAndIndefiniteLivedIntangibleAssetsAxis = us-gaap_LicensingAgreementsMember
Accumulated amortization and impairment losses | 0 rnr_IntangibleAssetsExcludingGoodwillAccumulatedAmortizationAndImpairment / rnr_FiniteAndIndefiniteLivedIntangibleAssetsAxis = us-gaap_LicensingAgreementsMember | 0 rnr_IntangibleAssetsExcludingGoodwillAccumulatedAmortizationAndImpairment / rnr_FiniteAndIndefiniteLivedIntangibleAssetsAxis = us-gaap_LicensingAgreementsMember
Other intangible assets, Net | 1,867 us-gaap_IntangibleAssetsNetExcludingGoodwill / rnr_FiniteAndIndefiniteLivedIntangibleAssetsAxis = us-gaap_LicensingAgreementsMember | 1,867 us-gaap_IntangibleAssetsNetExcludingGoodwill / rnr_FiniteAndIndefiniteLivedIntangibleAssetsAxis = us-gaap_LicensingAgreementsMember
Trademarks and trade names |  |
Schedule of Finite and Indefinite-lived Intangible Assets [Line Items] |  |
Gross carrying value | 610 us-gaap_IntangibleAssetsGrossExcludingGoodwill / rnr_FiniteAndIndefiniteLivedIntangibleAssetsAxis = us-gaap_TrademarksMember | 610 us-gaap_IntangibleAssetsGrossExcludingGoodwill / rnr_FiniteAndIndefiniteLivedIntangibleAssetsAxis = us-gaap_TrademarksMember
Accumulated amortization and impairment losses | (159)rnr_IntangibleAssetsExcludingGoodwillAccumulatedAmortizationAndImpairment / rnr_FiniteAndIndefiniteLivedIntangibleAssetsAxis = us-gaap_TrademarksMember | (134)rnr_IntangibleAssetsExcludingGoodwillAccumulatedAmortizationAndImpairment / rnr_FiniteAndIndefiniteLivedIntangibleAssetsAxis = us-gaap_TrademarksMember
Other intangible assets, Net | 451 us-gaap_IntangibleAssetsNetExcludingGoodwill / rnr_FiniteAndIndefiniteLivedIntangibleAssetsAxis = us-gaap_TrademarksMember | 476 us-gaap_IntangibleAssetsNetExcludingGoodwill / rnr_FiniteAndIndefiniteLivedIntangibleAssetsAxis = us-gaap_TrademarksMember
Covenants not-to-compete |  |
Schedule of Finite and Indefinite-lived Intangible Assets [Line Items] |  |
Gross carrying value | 2,130 us-gaap_IntangibleAssetsGrossExcludingGoodwill / rnr_FiniteAndIndefiniteLivedIntangibleAssetsAxis = us-gaap_NoncompeteAgreementsMember | 2,130 us-gaap_IntangibleAssetsGrossExcludingGoodwill / rnr_FiniteAndIndefiniteLivedIntangibleAssetsAxis = us-gaap_NoncompeteAgreementsMember
Accumulated amortization and impairment losses | (1,978)rnr_IntangibleAssetsExcludingGoodwillAccumulatedAmortizationAndImpairment / rnr_FiniteAndIndefiniteLivedIntangibleAssetsAxis = us-gaap_NoncompeteAgreementsMember | (1,674)rnr_IntangibleAssetsExcludingGoodwillAccumulatedAmortizationAndImpairment / rnr_FiniteAndIndefiniteLivedIntangibleAssetsAxis = us-gaap_NoncompeteAgreementsMember
Other intangible assets, Net | 152 us-gaap_IntangibleAssetsNetExcludingGoodwill / rnr_FiniteAndIndefiniteLivedIntangibleAssetsAxis = us-gaap_NoncompeteAgreementsMember | 456 us-gaap_IntangibleAssetsNetExcludingGoodwill / rnr_FiniteAndIndefiniteLivedIntangibleAssetsAxis = us-gaap_NoncompeteAgreementsMember
Software |  |
Schedule of Finite and Indefinite-lived Intangible Assets [Line Items] |  |
Gross carrying value | 8,730 us-gaap_IntangibleAssetsGrossExcludingGoodwill / rnr_FiniteAndIndefiniteLivedIntangibleAssetsAxis = us-gaap_ComputerSoftwareIntangibleAssetMember | 8,730 us-gaap_IntangibleAssetsGrossExcludingGoodwill / rnr_FiniteAndIndefiniteLivedIntangibleAssetsAxis = us-gaap_ComputerSoftwareIntangibleAssetMember
Accumulated amortization and impairment losses | (8,730)rnr_IntangibleAssetsExcludingGoodwillAccumulatedAmortizationAndImpairment / rnr_FiniteAndIndefiniteLivedIntangibleAssetsAxis = us-gaap_ComputerSoftwareIntangibleAssetMember | (8,730)rnr_IntangibleAssetsExcludingGoodwillAccumulatedAmortizationAndImpairment / rnr_FiniteAndIndefiniteLivedIntangibleAssetsAxis = us-gaap_ComputerSoftwareIntangibleAssetMember
Other intangible assets, Net | 0 us-gaap_IntangibleAssetsNetExcludingGoodwill / rnr_FiniteAndIndefiniteLivedIntangibleAssetsAxis = us-gaap_ComputerSoftwareIntangibleAssetMember | 0 us-gaap_IntangibleAssetsNetExcludingGoodwill / rnr_FiniteAndIndefiniteLivedIntangibleAssetsAxis = us-gaap_ComputerSoftwareIntangibleAssetMember
Patents and intellectual property |  |
Schedule of Finite and Indefinite-lived Intangible Assets [Line Items] |  |
Gross carrying value | 4,500 us-gaap_IntangibleAssetsGrossExcludingGoodwill / rnr_FiniteAndIndefiniteLivedIntangibleAssetsAxis = us-gaap_DevelopedTechnologyRightsMember | 4,500 us-gaap_IntangibleAssetsGrossExcludingGoodwill / rnr_FiniteAndIndefiniteLivedIntangibleAssetsAxis = us-gaap_DevelopedTechnologyRightsMember
Accumulated amortization and impairment losses | (4,500)rnr_IntangibleAssetsExcludingGoodwillAccumulatedAmortizationAndImpairment / rnr_FiniteAndIndefiniteLivedIntangibleAssetsAxis = us-gaap_DevelopedTechnologyRightsMember | (4,500)rnr_IntangibleAssetsExcludingGoodwillAccumulatedAmortizationAndImpairment / rnr_FiniteAndIndefiniteLivedIntangibleAssetsAxis = us-gaap_DevelopedTechnologyRightsMember
Other intangible assets, Net | 0 us-gaap_IntangibleAssetsNetExcludingGoodwill / rnr_FiniteAndIndefiniteLivedIntangibleAssetsAxis = us-gaap_DevelopedTechnologyRightsMember | $ 0 us-gaap_IntangibleAssetsNetExcludingGoodwill / rnr_FiniteAndIndefiniteLivedIntangibleAssetsAxis = us-gaap_DevelopedTechnologyRightsMember
Minimum |  |
Schedule of Finite and Indefinite-lived Intangible Assets [Line Items] |  |
Finite-lived intangible assets, useful life | 1 year |
Maximum |  |
Schedule of Finite and Indefinite-lived Intangible Assets [Line Items] |  |
Finite-lived intangible assets, useful life | 25 years |
Weighted Average |  |
Schedule of Finite and Indefinite-lived Intangible Assets [Line Items] |  |
Finite-lived intangible assets, useful life | 11 years |

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- Definition Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + 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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