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Variable Interest Entities (Details) (USD $)
 3 Months Ended 6 Months Ended 0 Months Ended 3 Months Ended 6 Months Ended 0 Months Ended 3 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Dec. 31, 2013
Dec. 31, 2013
Upsilon RFO
Variable Interest Entity, Primary Beneficiary
Jan. 02, 2013
Upsilon RFO
Variable Interest Entity, Primary Beneficiary
Jun. 30, 2014
Upsilon RFO
Variable Interest Entity, Primary Beneficiary
Mar. 31, 2014
Upsilon RFO
Variable Interest Entity, Primary Beneficiary
Jun. 30, 2014
Upsilon RFO
Variable Interest Entity, Primary Beneficiary
Jun. 30, 2014
Mona Lisa Re Ltd
Renaissance Reinsurance
Jun. 30, 2013
Mona Lisa Re Ltd
Renaissance Reinsurance
Jun. 30, 2014
Mona Lisa Re Ltd
DaVinciRe
Jun. 30, 2013
Mona Lisa Re Ltd
DaVinciRe
Jun. 30, 2014
Mona Lisa Re Ltd
Variable Interest Entity, Not Primary Beneficiary
Dec. 31, 2013
Mona Lisa Re Ltd
Variable Interest Entity, Not Primary Beneficiary
Jan. 02, 2013
Non-Voting Preference Shares
Upsilon RFO
Variable Interest Entity, Primary Beneficiary
Jun. 30, 2014
Non-Voting Preference Shares
Upsilon RFO
Variable Interest Entity, Primary Beneficiary
Mar. 31, 2014
Non-Voting Preference Shares
Upsilon RFO
Variable Interest Entity, Primary Beneficiary
Jul. 02, 2013
Non-Voting Preference Shares
Upsilon RFO
Variable Interest Entity, Primary Beneficiary
Variable Interest Entity [Line Items]                                        
Gross premiums written $ 511,540,000 $ 703,223,000 $ 1,216,800,000 $ 1,338,641,000     $ 53,500,000       $ 2,000,000 $ 1,200,000 $ 1,900,000 $ 1,200,000            
Ceded premiums earned 104,922,000 99,526,000 218,215,000 204,997,000             5,000,000 300,000 3,600,000 300,000            
Issuance of equity to third party investors                                 61,000,000 43,100,000 172,400,000  
Contributions to subsidiaries     0 0                         76,400,000 13,500,000 109,700,000  
Variable interest entity, ownership percentage           25.80% 55.60% 23.90% 38.90%                      
Increase (decrease) in funds held under insurance agreements             17,500,000 5,000,000 15,000,000                      
Risk participation percentage             42.90% 15.00% 33.60% 30.50%                    
Proceeds from sale of partial interest in consolidated subsidiary                                       25,000,000
Assets 8,515,625,000   8,515,625,000   8,179,131,000 474,200,000   487,000,000   487,000,000         179,115,000 209,615,000        
Liabilities 3,655,792,000   3,655,792,000   3,174,887,000 474,200,000   487,000,000   487,000,000         179,115,000 209,615,000        
Other liabilities $ 164,650,000   $ 164,650,000   $ 397,596,000 $ 156,300,000