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Variable Interest Entities (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 01, 2017
Jan. 01, 2017
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Dec. 31, 2016
Variable Interest Entity [Line Items]              
Assets     $ 13,705,680   $ 13,705,680   $ 12,352,082
Liabilities     7,508,342   7,508,342   6,309,911
Ceded premiums written     271,670 $ 239,212 649,624 $ 589,670  
Ceded premiums earned     194,439 $ 151,074 385,561 287,249  
Variable Interest Entity, Primary Beneficiary | Upsilon RFO Re Ltd.              
Variable Interest Entity [Line Items]              
Return of capital         41,800   242,500
Assets     339,100   339,100   193,000
Liabilities     339,100   339,100   193,000
Variable Interest Entity, Primary Beneficiary | Upsilon RFO Re Ltd. | Non-Voting Preference Shares              
Variable Interest Entity [Line Items]              
Issuance of equity to third party investors         134,100   166,600
Contributions to subsidiaries         9,500   55,200
Variable Interest Entity, Primary Beneficiary | Upsilon RFO Re Ltd. | RenaissanceRe Holdings Ltd.              
Variable Interest Entity [Line Items]              
Return of capital         $ 9,500   $ 59,800
Variable interest entity, ownership percentage         16.60%   28.80%
Variable Interest Entity, Primary Beneficiary | Upsilon RFO Re Ltd. | Third party investor | Non-Voting Preference Shares              
Variable Interest Entity [Line Items]              
Contributions to subsidiaries         $ 7,500    
Variable Interest Entity, Primary Beneficiary | Renaissance Reinsurance Ltd. | Fibonacci Reinsurance Ltd.              
Variable Interest Entity [Line Items]              
Ceded premiums written         9,400    
Ceded premiums earned         3,800    
Variable Interest Entity, Primary Beneficiary | Fibonacci Reinsurance Ltd.              
Variable Interest Entity [Line Items]              
Issuance of equity to third party investors $ 45,000 $ 140,000          
Variable Interest Entity, Primary Beneficiary | Fibonacci Reinsurance Ltd. | Other Investments              
Variable Interest Entity [Line Items]              
Investment in participating notes     55,500   55,500    
Variable Interest Entity, Not Primary Beneficiary | Mona Lisa Re Ltd              
Variable Interest Entity [Line Items]              
Assets     181,200   181,200   $ 184,200
Liabilities     $ 181,200   181,200   $ 184,200
Variable Interest Entity, Not Primary Beneficiary | Mona Lisa Re Ltd | Renaissance Reinsurance Ltd.              
Variable Interest Entity [Line Items]              
Ceded premiums written         100 100  
Ceded premiums earned         3,600 3,600  
Variable Interest Entity, Not Primary Beneficiary | Mona Lisa Re Ltd | DaVinci Reinsurance Ltd.              
Variable Interest Entity [Line Items]              
Ceded premiums written         37 100  
Ceded premiums earned         $ 2,500 $ 2,500