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Variable Interest Entities (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Nov. 13, 2014
Jun. 30, 2015
Jun. 30, 2014
Mar. 31, 2014
Jun. 30, 2015
Jun. 30, 2014
Dec. 31, 2014
Variable Interest Entity [Line Items]              
Assets   $ 12,053,186     $ 12,053,186   $ 8,203,550
Liabilities   6,227,430     6,227,430   3,206,127
Other liabilities   228,554     228,554   374,108
Gross premiums written   661,997 $ 511,540   1,305,575 $ 1,216,800  
Ceded premiums earned   110,150 $ 104,922   $ 218,894 218,215  
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 RFO | 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%      
Total amount of capital agreed to be returned             419,400
Return of capital to date         $ 418,500    
Assets   261,900     261,900   621,300
Liabilities   261,900     261,900   621,300
Other liabilities             135,700
Upsilon RFO | Variable Interest Entity, Primary Beneficiary | RenaissanceRe Holdings Ltd.              
Variable Interest Entity [Line Items]              
Total amount of capital agreed to be returned             131,400
Return of capital to date         131,100    
Upsilon RFO | 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         600 2,000  
Ceded premiums earned         3,600 5,000  
Mona Lisa Re Ltd | DaVinciRe Holdings Ltd.              
Variable Interest Entity [Line Items]              
Gross premiums written         500 1,900  
Ceded premiums earned         2,500 $ 3,600  
Mona Lisa Re Ltd | Variable Interest Entity, Not Primary Beneficiary              
Variable Interest Entity [Line Items]              
Assets   179,000     179,000   184,000
Liabilities   $ 179,000     $ 179,000   $ 184,000