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Schedule II. Condensed Financial Information Of Registrant (Comprehensive Income (Loss)) (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Condensed Financial Statements, Captions [Line Items]                      
Net (loss) income $ 2,143 $ (499,217) $ 176,738 $ 97,947 $ 75,031 $ 152,420 $ 141,921 $ 133,590 $ (222,389) $ 502,962 $ 431,192
Comprehensive (loss) income attributable to RenaissanceRe                 (223,298) 501,987 429,884
Parent Company                      
Condensed Financial Statements, Captions [Line Items]                      
Net (loss) income                 (222,389) 502,962 431,192
Comprehensive (loss) income attributable to RenaissanceRe                 $ (222,389) $ 502,962 $ 431,192