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Reserve for losses and loss expenses (Claims development triangles) (Details)
$ in Thousands
Dec. 31, 2016
USD ($)
Claims
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Dec. 31, 2013
USD ($)
Dec. 31, 2012
USD ($)
Dec. 31, 2011
USD ($)
Dec. 31, 2010
USD ($)
Dec. 31, 2009
USD ($)
Dec. 31, 2008
USD ($)
Dec. 31, 2007
USD ($)
Claims Development [Line Items]                    
Reserves for losses and loss expenses, net of reinsurance $ 2,459,039                  
Validus Re | Property                    
Claims Development [Line Items]                    
Incurred Losses and Loss Expenses, Net of Reinsurance 776,380                  
Cumulative Paid Losses and Loss Expenses, Net of Reinsurance 511,432                  
Liabilities for losses and loss expenses, before 2012, net of reinsurance 154,539                  
Reserves for losses and loss expenses, net of reinsurance 419,487                  
Validus Re | Property | 2016                    
Claims Development [Line Items]                    
Incurred Losses and Loss Expenses, Net of Reinsurance 149,263                  
Total of IBNR Reserves Plus Expected Development on Reported Losses 86,564                  
Cumulative Paid Losses and Loss Expenses, Net of Reinsurance 26,522                  
Validus Re | Property | 2015                    
Claims Development [Line Items]                    
Incurred Losses and Loss Expenses, Net of Reinsurance 118,484 $ 154,923                
Total of IBNR Reserves Plus Expected Development on Reported Losses 41,177                  
Cumulative Paid Losses and Loss Expenses, Net of Reinsurance 57,882 16,029                
Validus Re | Property | 2014                    
Claims Development [Line Items]                    
Incurred Losses and Loss Expenses, Net of Reinsurance 95,392 102,273 $ 108,206              
Total of IBNR Reserves Plus Expected Development on Reported Losses 6,757                  
Cumulative Paid Losses and Loss Expenses, Net of Reinsurance 78,509 63,415 25,346              
Validus Re | Property | 2013                    
Claims Development [Line Items]                    
Incurred Losses and Loss Expenses, Net of Reinsurance 132,830 141,203 156,233 $ 174,722            
Total of IBNR Reserves Plus Expected Development on Reported Losses 7,233                  
Cumulative Paid Losses and Loss Expenses, Net of Reinsurance 114,263 101,158 63,974 17,325            
Validus Re | Property | 2012                    
Claims Development [Line Items]                    
Incurred Losses and Loss Expenses, Net of Reinsurance 280,411 282,517 309,344 321,956 $ 397,635          
Total of IBNR Reserves Plus Expected Development on Reported Losses 19,108                  
Cumulative Paid Losses and Loss Expenses, Net of Reinsurance 234,256 225,518 202,141 149,433 67,004          
Validus Re | Marine                    
Claims Development [Line Items]                    
Incurred Losses and Loss Expenses, Net of Reinsurance 501,814                  
Cumulative Paid Losses and Loss Expenses, Net of Reinsurance 265,048                  
Liabilities for losses and loss expenses, before 2012, net of reinsurance 64,750                  
Reserves for losses and loss expenses, net of reinsurance 301,516                  
Validus Re | Marine | 2016                    
Claims Development [Line Items]                    
Incurred Losses and Loss Expenses, Net of Reinsurance 68,531                  
Total of IBNR Reserves Plus Expected Development on Reported Losses 49,619                  
Cumulative Paid Losses and Loss Expenses, Net of Reinsurance 8,801                  
Validus Re | Marine | 2015                    
Claims Development [Line Items]                    
Incurred Losses and Loss Expenses, Net of Reinsurance 119,490 129,864                
Total of IBNR Reserves Plus Expected Development on Reported Losses 55,557                  
Cumulative Paid Losses and Loss Expenses, Net of Reinsurance 16,180 3,723                
Validus Re | Marine | 2014                    
Claims Development [Line Items]                    
Incurred Losses and Loss Expenses, Net of Reinsurance 35,910 42,991 63,732              
Total of IBNR Reserves Plus Expected Development on Reported Losses 7,418                  
Cumulative Paid Losses and Loss Expenses, Net of Reinsurance 17,383 11,749 7,013              
Validus Re | Marine | 2013                    
Claims Development [Line Items]                    
Incurred Losses and Loss Expenses, Net of Reinsurance 61,210 63,630 74,022 76,776            
Total of IBNR Reserves Plus Expected Development on Reported Losses 7,347                  
Cumulative Paid Losses and Loss Expenses, Net of Reinsurance 44,512 39,493 28,996 11,784            
Validus Re | Marine | 2012                    
Claims Development [Line Items]                    
Incurred Losses and Loss Expenses, Net of Reinsurance 216,673 218,734 225,131 226,817 195,163          
Total of IBNR Reserves Plus Expected Development on Reported Losses 19,725                  
Cumulative Paid Losses and Loss Expenses, Net of Reinsurance 178,172 169,420 148,628 94,052 11,356          
Validus Re | Specialty                    
Claims Development [Line Items]                    
Incurred Losses and Loss Expenses, Net of Reinsurance 997,132                  
Cumulative Paid Losses and Loss Expenses, Net of Reinsurance 773,669                  
Liabilities for losses and loss expenses, before 2012, net of reinsurance 67,909                  
Reserves for losses and loss expenses, net of reinsurance 291,372                  
Validus Re | Specialty | 2016                    
Claims Development [Line Items]                    
Incurred Losses and Loss Expenses, Net of Reinsurance 295,872                  
Total of IBNR Reserves Plus Expected Development on Reported Losses 128,761                  
Cumulative Paid Losses and Loss Expenses, Net of Reinsurance 149,502                  
Validus Re | Specialty | 2015                    
Claims Development [Line Items]                    
Incurred Losses and Loss Expenses, Net of Reinsurance 279,766 296,554                
Total of IBNR Reserves Plus Expected Development on Reported Losses 32,236                  
Cumulative Paid Losses and Loss Expenses, Net of Reinsurance 235,819 177,776                
Validus Re | Specialty | 2014                    
Claims Development [Line Items]                    
Incurred Losses and Loss Expenses, Net of Reinsurance 200,649 208,508 213,911              
Total of IBNR Reserves Plus Expected Development on Reported Losses 8,372                  
Cumulative Paid Losses and Loss Expenses, Net of Reinsurance 176,202 162,056 95,765              
Validus Re | Specialty | 2013                    
Claims Development [Line Items]                    
Incurred Losses and Loss Expenses, Net of Reinsurance 174,219 178,736 190,470 182,297            
Total of IBNR Reserves Plus Expected Development on Reported Losses 1,974                  
Cumulative Paid Losses and Loss Expenses, Net of Reinsurance 166,814 164,366 157,688 99,340            
Validus Re | Specialty | 2012                    
Claims Development [Line Items]                    
Incurred Losses and Loss Expenses, Net of Reinsurance 46,626 47,428 49,263 54,573 53,798          
Total of IBNR Reserves Plus Expected Development on Reported Losses 733                  
Cumulative Paid Losses and Loss Expenses, Net of Reinsurance 45,332 44,942 44,037 41,156 17,716          
Talbot | Property                    
Claims Development [Line Items]                    
Incurred Losses and Loss Expenses, Net of Reinsurance 584,008                  
Cumulative Paid Losses and Loss Expenses, Net of Reinsurance 363,041                  
Liabilities for losses and loss expenses, before 2012, net of reinsurance 12,180                  
Reserves for losses and loss expenses, net of reinsurance 233,147                  
Talbot | Property | 2016                    
Claims Development [Line Items]                    
Incurred Losses and Loss Expenses, Net of Reinsurance 177,771                  
Total of IBNR Reserves Plus Expected Development on Reported Losses 76,755                  
Cumulative Paid Losses and Loss Expenses, Net of Reinsurance 37,880                  
Talbot | Property | 2015                    
Claims Development [Line Items]                    
Incurred Losses and Loss Expenses, Net of Reinsurance 109,608 138,087                
Total of IBNR Reserves Plus Expected Development on Reported Losses 12,696                  
Cumulative Paid Losses and Loss Expenses, Net of Reinsurance 63,437 24,537                
Talbot | Property | 2014                    
Claims Development [Line Items]                    
Incurred Losses and Loss Expenses, Net of Reinsurance 114,852 121,260 147,259              
Total of IBNR Reserves Plus Expected Development on Reported Losses 5,528                  
Cumulative Paid Losses and Loss Expenses, Net of Reinsurance 95,945 74,493 21,249              
Talbot | Property | 2013                    
Claims Development [Line Items]                    
Incurred Losses and Loss Expenses, Net of Reinsurance 81,004 83,426 96,814 118,167            
Total of IBNR Reserves Plus Expected Development on Reported Losses 605                  
Cumulative Paid Losses and Loss Expenses, Net of Reinsurance 73,267 67,328 48,231 12,813            
Talbot | Property | 2012                    
Claims Development [Line Items]                    
Incurred Losses and Loss Expenses, Net of Reinsurance 100,773 101,387 100,748 112,488 135,923          
Total of IBNR Reserves Plus Expected Development on Reported Losses 2,413                  
Cumulative Paid Losses and Loss Expenses, Net of Reinsurance 92,512 88,150 83,824 61,490 13,051          
Talbot | Marine                    
Claims Development [Line Items]                    
Incurred Losses and Loss Expenses, Net of Reinsurance 846,754                  
Cumulative Paid Losses and Loss Expenses, Net of Reinsurance 494,362                  
Liabilities for losses and loss expenses, before 2012, net of reinsurance 44,753                  
Reserves for losses and loss expenses, net of reinsurance 397,145                  
Talbot | Marine | 2016                    
Claims Development [Line Items]                    
Incurred Losses and Loss Expenses, Net of Reinsurance 159,153                  
Total of IBNR Reserves Plus Expected Development on Reported Losses 89,536                  
Cumulative Paid Losses and Loss Expenses, Net of Reinsurance 35,105                  
Talbot | Marine | 2015                    
Claims Development [Line Items]                    
Incurred Losses and Loss Expenses, Net of Reinsurance 192,818 187,790                
Total of IBNR Reserves Plus Expected Development on Reported Losses 54,285                  
Cumulative Paid Losses and Loss Expenses, Net of Reinsurance 73,957 25,300                
Talbot | Marine | 2014                    
Claims Development [Line Items]                    
Incurred Losses and Loss Expenses, Net of Reinsurance 154,105 155,361 180,401              
Total of IBNR Reserves Plus Expected Development on Reported Losses 13,671                  
Cumulative Paid Losses and Loss Expenses, Net of Reinsurance 102,788 74,547 24,433              
Talbot | Marine | 2013                    
Claims Development [Line Items]                    
Incurred Losses and Loss Expenses, Net of Reinsurance 161,839 168,203 188,991 189,091            
Total of IBNR Reserves Plus Expected Development on Reported Losses 11,372                  
Cumulative Paid Losses and Loss Expenses, Net of Reinsurance 125,037 112,781 88,494 38,416            
Talbot | Marine | 2012                    
Claims Development [Line Items]                    
Incurred Losses and Loss Expenses, Net of Reinsurance 178,839 182,283 186,278 203,855 208,883          
Total of IBNR Reserves Plus Expected Development on Reported Losses 5,154                  
Cumulative Paid Losses and Loss Expenses, Net of Reinsurance 157,475 153,550 136,335 105,600 36,491          
Talbot | Specialty                    
Claims Development [Line Items]                    
Incurred Losses and Loss Expenses, Net of Reinsurance 757,365                  
Cumulative Paid Losses and Loss Expenses, Net of Reinsurance 460,492                  
Liabilities for losses and loss expenses, before 2012, net of reinsurance 45,486                  
Reserves for losses and loss expenses, net of reinsurance 342,359                  
Talbot | Specialty | 2016                    
Claims Development [Line Items]                    
Incurred Losses and Loss Expenses, Net of Reinsurance 166,604                  
Total of IBNR Reserves Plus Expected Development on Reported Losses 105,142                  
Cumulative Paid Losses and Loss Expenses, Net of Reinsurance 33,468                  
Talbot | Specialty | 2015                    
Claims Development [Line Items]                    
Incurred Losses and Loss Expenses, Net of Reinsurance 149,031 152,907                
Total of IBNR Reserves Plus Expected Development on Reported Losses 39,447                  
Cumulative Paid Losses and Loss Expenses, Net of Reinsurance 85,397 35,724                
Talbot | Specialty | 2014                    
Claims Development [Line Items]                    
Incurred Losses and Loss Expenses, Net of Reinsurance 198,653 214,962 215,960              
Total of IBNR Reserves Plus Expected Development on Reported Losses 39,248                  
Cumulative Paid Losses and Loss Expenses, Net of Reinsurance 135,526 107,882 41,183              
Talbot | Specialty | 2013                    
Claims Development [Line Items]                    
Incurred Losses and Loss Expenses, Net of Reinsurance 124,208 132,797 145,905 166,450            
Total of IBNR Reserves Plus Expected Development on Reported Losses 8,724                  
Cumulative Paid Losses and Loss Expenses, Net of Reinsurance 100,213 91,940 77,428 42,325            
Talbot | Specialty | 2012                    
Claims Development [Line Items]                    
Incurred Losses and Loss Expenses, Net of Reinsurance 118,869 120,621 122,760 132,735 151,306          
Total of IBNR Reserves Plus Expected Development on Reported Losses 5,886                  
Cumulative Paid Losses and Loss Expenses, Net of Reinsurance 105,888 87,753 83,201 57,906 25,591          
Western World Insurance Group, Inc | Property                    
Claims Development [Line Items]                    
Incurred Losses and Loss Expenses, Net of Reinsurance 193,722                  
Cumulative Paid Losses and Loss Expenses, Net of Reinsurance 174,956                  
Liabilities for losses and loss expenses, before 2012, net of reinsurance 0                  
Reserves for losses and loss expenses, net of reinsurance 18,766                  
Western World Insurance Group, Inc | Property | 2016                    
Claims Development [Line Items]                    
Incurred Losses and Loss Expenses, Net of Reinsurance 46,636                  
Total of IBNR Reserves Plus Expected Development on Reported Losses $ 9,324                  
Cumulative Reported Claims Count | Claims 1,587                  
Cumulative Paid Losses and Loss Expenses, Net of Reinsurance $ 29,666                  
Western World Insurance Group, Inc | Property | 2015                    
Claims Development [Line Items]                    
Incurred Losses and Loss Expenses, Net of Reinsurance 26,002 27,879                
Total of IBNR Reserves Plus Expected Development on Reported Losses $ 135                  
Cumulative Reported Claims Count | Claims 1,788                  
Cumulative Paid Losses and Loss Expenses, Net of Reinsurance $ 25,302 18,981                
Western World Insurance Group, Inc | Property | 2014                    
Claims Development [Line Items]                    
Incurred Losses and Loss Expenses, Net of Reinsurance 28,619 29,282 35,612              
Total of IBNR Reserves Plus Expected Development on Reported Losses $ 103                  
Cumulative Reported Claims Count | Claims 2,393                  
Cumulative Paid Losses and Loss Expenses, Net of Reinsurance $ 27,606 27,211 21,913              
Western World Insurance Group, Inc | Property | 2013                    
Claims Development [Line Items]                    
Incurred Losses and Loss Expenses, Net of Reinsurance 23,599 23,659 23,561 21,825            
Total of IBNR Reserves Plus Expected Development on Reported Losses $ 0                  
Cumulative Reported Claims Count | Claims 1,950                  
Cumulative Paid Losses and Loss Expenses, Net of Reinsurance $ 23,561 23,104 22,647 15,568            
Western World Insurance Group, Inc | Property | 2012                    
Claims Development [Line Items]                    
Incurred Losses and Loss Expenses, Net of Reinsurance 15,522 15,556 15,594 15,491 15,506          
Total of IBNR Reserves Plus Expected Development on Reported Losses $ 0                  
Cumulative Reported Claims Count | Claims 1,680                  
Cumulative Paid Losses and Loss Expenses, Net of Reinsurance $ 15,522 15,513 15,435 14,838 11,166          
Western World Insurance Group, Inc | Property | 2011                    
Claims Development [Line Items]                    
Incurred Losses and Loss Expenses, Net of Reinsurance 12,021 12,012 12,134 12,000 12,223 $ 12,588        
Total of IBNR Reserves Plus Expected Development on Reported Losses $ 0                  
Cumulative Reported Claims Count | Claims 1,238                  
Cumulative Paid Losses and Loss Expenses, Net of Reinsurance $ 12,021 12,009 12,027 11,976 12,000 9,797        
Western World Insurance Group, Inc | Property | 2010                    
Claims Development [Line Items]                    
Incurred Losses and Loss Expenses, Net of Reinsurance 11,332 11,438 11,448 11,414 11,507 11,573 $ 11,846      
Total of IBNR Reserves Plus Expected Development on Reported Losses $ 0                  
Cumulative Reported Claims Count | Claims 974                  
Cumulative Paid Losses and Loss Expenses, Net of Reinsurance $ 11,287 10,903 10,882 10,854 10,905 10,521 8,563      
Western World Insurance Group, Inc | Property | 2009                    
Claims Development [Line Items]                    
Incurred Losses and Loss Expenses, Net of Reinsurance 10,060 10,060 10,060 10,060 10,034 10,039 10,005 $ 10,300    
Total of IBNR Reserves Plus Expected Development on Reported Losses $ 0                  
Cumulative Reported Claims Count | Claims 784                  
Cumulative Paid Losses and Loss Expenses, Net of Reinsurance $ 10,060 10,060 10,060 10,060 10,003 9,942 9,948 8,096    
Western World Insurance Group, Inc | Property | 2008                    
Claims Development [Line Items]                    
Incurred Losses and Loss Expenses, Net of Reinsurance 11,724 11,724 11,724 11,721 11,729 11,762 11,805 11,615 $ 12,094  
Total of IBNR Reserves Plus Expected Development on Reported Losses $ 0                  
Cumulative Reported Claims Count | Claims 412                  
Cumulative Paid Losses and Loss Expenses, Net of Reinsurance $ 11,724 11,724 11,724 11,721 11,714 11,747 11,672 11,288 8,895  
Western World Insurance Group, Inc | Property | 2007                    
Claims Development [Line Items]                    
Incurred Losses and Loss Expenses, Net of Reinsurance 8,207 8,207 8,207 8,206 8,206 8,209 8,209 8,218 8,161 $ 8,520
Total of IBNR Reserves Plus Expected Development on Reported Losses $ 0                  
Cumulative Reported Claims Count | Claims 841                  
Cumulative Paid Losses and Loss Expenses, Net of Reinsurance $ 8,207 8,207 8,207 8,206 8,206 8,206 8,206 8,192 7,968 5,418
Western World Insurance Group, Inc | Liability                    
Claims Development [Line Items]                    
Incurred Losses and Loss Expenses, Net of Reinsurance 1,296,661                  
Cumulative Paid Losses and Loss Expenses, Net of Reinsurance 850,358                  
Liabilities for losses and loss expenses, before 2012, net of reinsurance 8,944                  
Reserves for losses and loss expenses, net of reinsurance 455,247                  
Western World Insurance Group, Inc | Liability | 2016                    
Claims Development [Line Items]                    
Incurred Losses and Loss Expenses, Net of Reinsurance 133,303                  
Total of IBNR Reserves Plus Expected Development on Reported Losses $ 104,906                  
Cumulative Reported Claims Count | Claims 3,156                  
Cumulative Paid Losses and Loss Expenses, Net of Reinsurance $ 9,873                  
Western World Insurance Group, Inc | Liability | 2015                    
Claims Development [Line Items]                    
Incurred Losses and Loss Expenses, Net of Reinsurance 158,591 154,184                
Total of IBNR Reserves Plus Expected Development on Reported Losses $ 76,092                  
Cumulative Reported Claims Count | Claims 5,152                  
Cumulative Paid Losses and Loss Expenses, Net of Reinsurance $ 39,598 12,662                
Western World Insurance Group, Inc | Liability | 2014                    
Claims Development [Line Items]                    
Incurred Losses and Loss Expenses, Net of Reinsurance 203,592 197,388 197,022              
Total of IBNR Reserves Plus Expected Development on Reported Losses $ 44,988                  
Cumulative Reported Claims Count | Claims 7,469                  
Cumulative Paid Losses and Loss Expenses, Net of Reinsurance $ 98,848 52,543 16,468              
Western World Insurance Group, Inc | Liability | 2013                    
Claims Development [Line Items]                    
Incurred Losses and Loss Expenses, Net of Reinsurance 158,329 164,428 165,233 132,077            
Total of IBNR Reserves Plus Expected Development on Reported Losses $ 17,049                  
Cumulative Reported Claims Count | Claims 5,990                  
Cumulative Paid Losses and Loss Expenses, Net of Reinsurance $ 108,613 77,776 41,782 10,159            
Western World Insurance Group, Inc | Liability | 2012                    
Claims Development [Line Items]                    
Incurred Losses and Loss Expenses, Net of Reinsurance 127,486 132,562 133,990 111,283 108,981          
Total of IBNR Reserves Plus Expected Development on Reported Losses $ 9,410                  
Cumulative Reported Claims Count | Claims 4,649                  
Cumulative Paid Losses and Loss Expenses, Net of Reinsurance $ 108,409 92,499 65,437 31,291 8,823          
Western World Insurance Group, Inc | Liability | 2011                    
Claims Development [Line Items]                    
Incurred Losses and Loss Expenses, Net of Reinsurance 108,301 109,183 109,412 107,827 107,741 101,091        
Total of IBNR Reserves Plus Expected Development on Reported Losses $ 4,627                  
Cumulative Reported Claims Count | Claims 4,372                  
Cumulative Paid Losses and Loss Expenses, Net of Reinsurance $ 96,780 88,415 75,000 50,197 27,438 7,331        
Western World Insurance Group, Inc | Liability | 2010                    
Claims Development [Line Items]                    
Incurred Losses and Loss Expenses, Net of Reinsurance 103,973 106,066 105,400 112,072 111,675 108,823 101,223      
Total of IBNR Reserves Plus Expected Development on Reported Losses $ 3,877                  
Cumulative Reported Claims Count | Claims 4,205                  
Cumulative Paid Losses and Loss Expenses, Net of Reinsurance $ 96,309 92,889 84,320 71,430 51,765 28,393 8,215      
Western World Insurance Group, Inc | Liability | 2009                    
Claims Development [Line Items]                    
Incurred Losses and Loss Expenses, Net of Reinsurance 95,266 96,235 98,261 116,327 116,463 116,990 116,780 116,474    
Total of IBNR Reserves Plus Expected Development on Reported Losses $ 2,173                  
Cumulative Reported Claims Count | Claims 3,955                  
Cumulative Paid Losses and Loss Expenses, Net of Reinsurance $ 90,415 89,688 85,644 77,895 65,009 48,255 30,131 10,023    
Western World Insurance Group, Inc | Liability | 2008                    
Claims Development [Line Items]                    
Incurred Losses and Loss Expenses, Net of Reinsurance 101,478 102,070 102,424 129,559 131,006 133,088 135,330 135,280 135,009  
Total of IBNR Reserves Plus Expected Development on Reported Losses $ 2,075                  
Cumulative Reported Claims Count | Claims 4,950                  
Cumulative Paid Losses and Loss Expenses, Net of Reinsurance $ 97,475 95,773 93,563 89,433 82,661 71,239 51,165 28,467 8,654  
Western World Insurance Group, Inc | Liability | 2007                    
Claims Development [Line Items]                    
Incurred Losses and Loss Expenses, Net of Reinsurance 106,342 107,350 107,894 149,994 152,163 154,499 158,478 160,117 162,239 164,717
Total of IBNR Reserves Plus Expected Development on Reported Losses $ 1,981                  
Cumulative Reported Claims Count | Claims 4,727                  
Cumulative Paid Losses and Loss Expenses, Net of Reinsurance $ 104,038 $ 103,961 $ 102,600 $ 99,978 $ 96,658 $ 91,020 $ 80,218 $ 58,358 $ 30,741 $ 10,723