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Variable Interest Entities (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Nov. 13, 2014
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Variable Interest Entity [Line Items]                        
Investment in variable interest entity                   $ 0 $ 0 $ 0
Total assets   $ 11,560,871       $ 8,203,550       11,560,871 8,203,550  
Total liabilities   5,782,723       3,206,127       5,782,723 3,206,127  
Other assets   186,595       135,845       186,595 135,845  
Capital raised by third party investors   245,145       374,108       245,145 374,108  
Gross premiums written   336,093 $ 369,642 $ 661,997 $ 643,578 132,780 $ 200,992 $ 511,540 $ 705,260 2,011,310 1,550,572 1,605,412
Ceded premiums written                   595,127 482,336 401,465
Ceded premiums earned                   466,719 453,658 $ 412,415
RenaissanceRe Upsilon Fund Ltd | Not Primary Beneficiary                        
Variable Interest Entity [Line Items]                        
Percent of segregated funds owned by third party investors 100.00%                      
Expense override                   1,700 0  
Profit commissions                   $ 2,900 0  
Upsilon RFO | Primary Beneficiary                        
Variable Interest Entity [Line Items]                        
Variable interest entity, ownership percentage               23.90% 38.90% 21.70%    
Capital provided through an insurance contract               $ 5,000 $ 15,000      
Risk participation percentage               15.00% 33.60%      
Capital distribution payable           420,200         420,200  
Return of capital                   $ 418,500    
Total assets   250,600       621,300       250,600 621,300  
Total liabilities   250,500       621,300       250,500 621,300  
Other assets           135,700         135,700  
Upsilon RFO | Primary Beneficiary | RenaissanceRe Holdings Ltd. (Parent Guarantor)                        
Variable Interest Entity [Line Items]                        
Capital distribution payable           132,300         132,300  
Return of capital                   131,600    
Upsilon RFO | Primary Beneficiary | Non-voting preference shares                        
Variable Interest Entity [Line Items]                        
Non-voting preference shares issued to third parties               $ 43,100 $ 172,400 153,700    
Investment in variable interest entity               $ 13,500 $ 109,700 42,500    
Mona Lisa Re | Renaissance Reinsurance Ltd.                        
Variable Interest Entity [Line Items]                        
Ceded premiums written                   7,300 7,400  
Ceded premiums earned                   7,300 8,200  
Mona Lisa Re | DaVinci Reinsurance Ltd.                        
Variable Interest Entity [Line Items]                        
Ceded premiums written                   5,000 5,100  
Ceded premiums earned                   5,000 5,700  
Mona Lisa Re | Not Primary Beneficiary                        
Variable Interest Entity [Line Items]                        
Total assets   184,000       184,000       184,000 184,000  
Total liabilities   $ 184,000       $ 184,000       $ 184,000 $ 184,000