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Schedule II. Condensed Financial Information Of Registrant (Comprehensive Income (Loss)) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Condensed Financial Statements, Captions [Line Items]
Net income	$ 220,577us-gaap_ProfitLoss	$ 103,887us-gaap_ProfitLoss	$ 162,426us-gaap_ProfitLoss	$ 199,366us-gaap_ProfitLoss	$ 328,442us-gaap_ProfitLoss	$ 229,666us-gaap_ProfitLoss	$ 48,304us-gaap_ProfitLoss	$ 235,356us-gaap_ProfitLoss	$ 686,256us-gaap_ProfitLoss	$ 841,768us-gaap_ProfitLoss	$ 748,949us-gaap_ProfitLoss
Comprehensive income (loss) attributable to RenaissanceRe									532,003us-gaap_ComprehensiveIncomeNetOfTax	681,133us-gaap_ComprehensiveIncomeNetOfTax	602,771us-gaap_ComprehensiveIncomeNetOfTax
Parent Company
Condensed Financial Statements, Captions [Line Items]
Net income									532,718us-gaap_ProfitLoss / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	690,624us-gaap_ProfitLoss / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	600,909us-gaap_ProfitLoss / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Comprehensive income (loss) attributable to RenaissanceRe									$ 532,718us-gaap_ComprehensiveIncomeNetOfTax / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	$ 690,624us-gaap_ComprehensiveIncomeNetOfTax / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	$ 600,909us-gaap_ComprehensiveIncomeNetOfTax / dei_LegalEntityAxis = us-gaap_ParentCompanyMember

X

- Definition

Amount after tax of increase (decrease) in equity from transactions and other events and circumstances from net income and other comprehensive income, attributable to parent entity. Excludes changes in equity resulting from investments by owners and distributions to owners.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Other Comprehensive Income

-URI http://asc.fasb.org/extlink&oid=6519514



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Comprehensive Income

-URI http://asc.fasb.org/extlink&oid=35737396



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 220

-SubTopic 10

-Section 45

-Paragraph 5

-URI http://asc.fasb.org/extlink&oid=36458714&loc=d3e557-108580



Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Net Income

-URI http://asc.fasb.org/extlink&oid=6518256

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X

- Definition

The consolidated profit or loss for the period, net of income taxes, including the portion attributable to the noncontrolling interest.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 810

-SubTopic 10

-Section 55

-Paragraph 4K

-URI http://asc.fasb.org/extlink&oid=35736750&loc=SL4591552-111686



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 810

-SubTopic 10

-Section 45

-Paragraph 19

-URI http://asc.fasb.org/extlink&oid=7656940&loc=SL4569616-111683



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 810

-SubTopic 10

-Section 50

-Paragraph 1A

-Subparagraph (a),(c)

-URI http://asc.fasb.org/extlink&oid=18733093&loc=SL4573702-111684



Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 810

-SubTopic 10

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-URI http://asc.fasb.org/extlink&oid=35736750&loc=SL4591551-111686

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