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Variable Interest Entities (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Jan. 01, 2016
Mar. 31, 2016
Mar. 31, 2015
Dec. 31, 2015
Variable Interest Entity [Line Items]        
Contributions to subsidiaries   $ 0 $ 0  
Assets   12,153,913   $ 11,555,287
Liabilities   6,311,983   5,777,139
Ceded premiums written   350,458 239,543  
Ceded premiums earned   136,175 108,744  
Upsilon Reinsurance Fund Opportunities Ltd. | Variable Interest Entity, Primary Beneficiary        
Variable Interest Entity [Line Items]        
Capital distribution payable $ 200,500     420,200
Return of capital to date $ 96,700     $ 418,500
Variable interest entity, ownership percentage 28.30%     21.70%
Assets   173,600   $ 250,600
Liabilities   173,500   250,500
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 $ 62,500     153,700
Contributions to subsidiaries 25,300     42,500
Upsilon Reinsurance Fund Opportunities Ltd. | Variable Interest Entity, Primary Beneficiary | RenaissanceRe Holdings Ltd.        
Variable Interest Entity [Line Items]        
Capital distribution payable 41,300     132,300
Return of capital to date $ 16,000     131,600
Mona Lisa Re Ltd | Renaissance Reinsurance Ltd.        
Variable Interest Entity [Line Items]        
Ceded premiums written   100 100  
Ceded premiums earned   1,900 1,900  
Mona Lisa Re Ltd | DaVinci Reinsurance Ltd.        
Variable Interest Entity [Line Items]        
Ceded premiums written   100 100  
Ceded premiums earned   1,300 $ 1,300  
Mona Lisa Re Ltd | Variable Interest Entity, Not Primary Beneficiary        
Variable Interest Entity [Line Items]        
Assets   181,200   184,000
Liabilities   $ 181,200   $ 184,000