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Variable Interest Entities (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Nov. 13, 2014
Sep. 30, 2015
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Sep. 30, 2015
Sep. 30, 2014
Dec. 31, 2014
Variable Interest Entity [Line Items]                
Assets   $ 11,906,721       $ 11,906,721   $ 8,203,550
Liabilities   6,187,050       6,187,050   3,206,127
Other liabilities   244,005       244,005   374,108
Gross premiums written   369,642 $ 200,992     1,675,217 $ 1,417,792  
Ceded premiums earned   120,609 $ 113,264     $ 339,503 331,479  
RenaissanceRe Upsilon Fund Ltd. | Variable Interest Entity, Not Primary Beneficiary                
Variable Interest Entity [Line Items]                
Percent of segregated funds owned by third party investors 100.00%              
Upsilon Reinsurance Fund Opportunities Ltd. | Variable Interest Entity, Primary Beneficiary                
Variable Interest Entity [Line Items]                
Variable interest entity, ownership percentage       23.90% 38.90% 20.50%    
Increase (decrease) in funds held under insurance agreements       $ 5,000 $ 15,000      
Risk participation percentage       15.00% 33.60%      
Capital distribution payable               419,400
Return of capital to date           $ 418,500    
Assets   250,300       250,300   621,300
Liabilities   250,200       250,200   621,300
Other liabilities               135,700
Upsilon Reinsurance Fund Opportunities Ltd. | Variable Interest Entity, Primary Beneficiary | RenaissanceRe Holdings Ltd.                
Variable Interest Entity [Line Items]                
Capital distribution payable               131,400
Return of capital to date           131,100    
Upsilon Reinsurance Fund Opportunities Ltd. | Variable Interest Entity, Primary Beneficiary | Non-Voting Preference Shares                
Variable Interest Entity [Line Items]                
Issuance of equity to third party investors       $ 43,100 $ 172,400 155,400    
Contributions to subsidiaries       $ 13,500 $ 109,700 42,200    
Mona Lisa Re Ltd | Renaissance Reinsurance Ltd.                
Variable Interest Entity [Line Items]                
Gross premiums written           7,300 8,600  
Ceded premiums earned           5,400 6,900  
Mona Lisa Re Ltd | DaVinciRe Holdings Ltd.                
Variable Interest Entity [Line Items]                
Gross premiums written           5,000 6,300  
Ceded premiums earned           3,700 $ 4,900  
Mona Lisa Re Ltd | Variable Interest Entity, Not Primary Beneficiary                
Variable Interest Entity [Line Items]                
Assets   187,100       187,100   184,000
Liabilities   $ 187,100       $ 187,100   $ 184,000