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Segment information (Segment geographic) (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Gross premiums written allocated to the territory of coverage exposure                      
Gross premiums written $ 339,454 $ 372,418 $ 764,042 $ 1,172,791 $ 309,605 $ 402,509 $ 726,168 $ 1,119,224 $ 2,648,705 $ 2,557,506 $ 2,358,865
Percent of gross premiums written                 100.00% 100.00% 100.00%
United States                      
Gross premiums written allocated to the territory of coverage exposure                      
Gross premiums written                 $ 937,587 $ 954,311 $ 633,220
Percent of gross premiums written                 35.40% 37.40% 26.80%
Worldwide excluding United States                      
Gross premiums written allocated to the territory of coverage exposure                      
Gross premiums written                 $ 221,766 [1] $ 187,321 $ 221,092 [1]
Percent of gross premiums written [1]                 8.40% 7.30% 9.40%
Australia and New Zealand                      
Gross premiums written allocated to the territory of coverage exposure                      
Gross premiums written                 $ 23,049 $ 21,544 $ 31,012
Percent of gross premiums written                 0.90% 0.80% 1.30%
Europe                      
Gross premiums written allocated to the territory of coverage exposure                      
Gross premiums written                 $ 65,781 $ 88,266 $ 103,851
Percent of gross premiums written                 2.40% 3.50% 4.40%
Latin America and Caribbean                      
Gross premiums written allocated to the territory of coverage exposure                      
Gross premiums written                 $ 140,395 $ 134,133 $ 146,376
Percent of gross premiums written                 5.30% 5.20% 6.20%
Japan                      
Gross premiums written allocated to the territory of coverage exposure                      
Gross premiums written                 $ 49,867 $ 45,618 $ 47,426
Percent of gross premiums written                 1.90% 1.80% 2.00%
Canada                      
Gross premiums written allocated to the territory of coverage exposure                      
Gross premiums written                 $ 10,243 $ 10,022 $ 13,864
Percent of gross premiums written                 0.40% 0.40% 0.60%
Rest of world                      
Gross premiums written allocated to the territory of coverage exposure                      
Gross premiums written [2]                 $ 127,252 $ 121,075 $ 114,479
Percent of gross premiums written [2]                 4.80% 4.70% 4.90%
Sub-total, non United States                      
Gross premiums written allocated to the territory of coverage exposure                      
Gross premiums written                 $ 638,353 $ 607,979 $ 678,100
Percent of gross premiums written                 24.10% 23.70% 28.80%
Worldwide including United States                      
Gross premiums written allocated to the territory of coverage exposure                      
Gross premiums written [1]                 $ 424,646 $ 338,345 $ 344,934
Percent of gross premiums written [1]                 16.00% 13.20% 14.60%
Other location non-specific                      
Gross premiums written allocated to the territory of coverage exposure                      
Gross premiums written [3]                 $ 648,119 $ 656,871 $ 702,611
Percent of gross premiums written [3]                 24.50% 25.70% 29.80%
Operating Segments | Validus Re                      
Gross premiums written allocated to the territory of coverage exposure                      
Gross premiums written                 $ 1,111,054 $ 1,126,759 $ 1,118,532
Operating Segments | Validus Re | United States                      
Gross premiums written allocated to the territory of coverage exposure                      
Gross premiums written                 448,243 530,541 437,124
Operating Segments | Validus Re | Worldwide excluding United States                      
Gross premiums written allocated to the territory of coverage exposure                      
Gross premiums written [1]                 51,902 52,860 76,370
Operating Segments | Validus Re | Australia and New Zealand                      
Gross premiums written allocated to the territory of coverage exposure                      
Gross premiums written                 7,389 12,190 20,617
Operating Segments | Validus Re | Europe                      
Gross premiums written allocated to the territory of coverage exposure                      
Gross premiums written                 28,967 48,240 57,223
Operating Segments | Validus Re | Latin America and Caribbean                      
Gross premiums written allocated to the territory of coverage exposure                      
Gross premiums written                 47,586 46,258 56,102
Operating Segments | Validus Re | Japan                      
Gross premiums written allocated to the territory of coverage exposure                      
Gross premiums written                 40,099 38,885 42,813
Operating Segments | Validus Re | Canada                      
Gross premiums written allocated to the territory of coverage exposure                      
Gross premiums written                 3,349 3,129 3,793
Operating Segments | Validus Re | Rest of world                      
Gross premiums written allocated to the territory of coverage exposure                      
Gross premiums written [2]                 22,595 21,498 25,272
Operating Segments | Validus Re | Sub-total, non United States                      
Gross premiums written allocated to the territory of coverage exposure                      
Gross premiums written                 201,887 223,060 282,190
Operating Segments | Validus Re | Worldwide including United States                      
Gross premiums written allocated to the territory of coverage exposure                      
Gross premiums written [1]                 167,065 139,419 175,098
Operating Segments | Validus Re | Other location non-specific                      
Gross premiums written allocated to the territory of coverage exposure                      
Gross premiums written [3]                 293,859 233,739 224,120
Operating Segments | AlphaCat                      
Gross premiums written allocated to the territory of coverage exposure                      
Gross premiums written [4]                 270,402 176,126 126,785
Operating Segments | AlphaCat | United States                      
Gross premiums written allocated to the territory of coverage exposure                      
Gross premiums written                 64,766 41,134 26,067
Operating Segments | AlphaCat | Worldwide excluding United States                      
Gross premiums written allocated to the territory of coverage exposure                      
Gross premiums written [1]                 22,206 8,107 6,727
Operating Segments | AlphaCat | Australia and New Zealand                      
Gross premiums written allocated to the territory of coverage exposure                      
Gross premiums written                 4,949 624 1,019
Operating Segments | AlphaCat | Europe                      
Gross premiums written allocated to the territory of coverage exposure                      
Gross premiums written                 3,245 2,504 2,305
Operating Segments | AlphaCat | Latin America and Caribbean                      
Gross premiums written allocated to the territory of coverage exposure                      
Gross premiums written                 0 38 0
Operating Segments | AlphaCat | Japan                      
Gross premiums written allocated to the territory of coverage exposure                      
Gross premiums written                 3,221 1,671 608
Operating Segments | AlphaCat | Canada                      
Gross premiums written allocated to the territory of coverage exposure                      
Gross premiums written                 207 458 214
Operating Segments | AlphaCat | Rest of world                      
Gross premiums written allocated to the territory of coverage exposure                      
Gross premiums written [2]                 0 0 0
Operating Segments | AlphaCat | Sub-total, non United States                      
Gross premiums written allocated to the territory of coverage exposure                      
Gross premiums written                 33,828 13,402 10,873
Operating Segments | AlphaCat | Worldwide including United States                      
Gross premiums written allocated to the territory of coverage exposure                      
Gross premiums written [1]                 170,253 116,523 89,845
Operating Segments | AlphaCat | Other location non-specific                      
Gross premiums written allocated to the territory of coverage exposure                      
Gross premiums written [3]                 1,555 5,067 0
Operating Segments | Talbot                      
Gross premiums written allocated to the territory of coverage exposure                      
Gross premiums written                 970,702 1,018,835 1,101,770
Operating Segments | Talbot | United States                      
Gross premiums written allocated to the territory of coverage exposure                      
Gross premiums written                 103,415 106,679 108,458
Operating Segments | Talbot | Worldwide excluding United States                      
Gross premiums written allocated to the territory of coverage exposure                      
Gross premiums written [1]                 148,347 127,540 139,570
Operating Segments | Talbot | Australia and New Zealand                      
Gross premiums written allocated to the territory of coverage exposure                      
Gross premiums written                 10,844 8,974 9,736
Operating Segments | Talbot | Europe                      
Gross premiums written allocated to the territory of coverage exposure                      
Gross premiums written                 34,264 38,657 45,615
Operating Segments | Talbot | Latin America and Caribbean                      
Gross premiums written allocated to the territory of coverage exposure                      
Gross premiums written                 102,293 103,318 116,281
Operating Segments | Talbot | Japan                      
Gross premiums written allocated to the territory of coverage exposure                      
Gross premiums written                 6,580 5,171 4,116
Operating Segments | Talbot | Canada                      
Gross premiums written allocated to the territory of coverage exposure                      
Gross premiums written                 6,834 6,666 10,194
Operating Segments | Talbot | Rest of world                      
Gross premiums written allocated to the territory of coverage exposure                      
Gross premiums written [2]                 107,106 103,237 93,012
Operating Segments | Talbot | Sub-total, non United States                      
Gross premiums written allocated to the territory of coverage exposure                      
Gross premiums written                 416,268 393,563 418,524
Operating Segments | Talbot | Worldwide including United States                      
Gross premiums written allocated to the territory of coverage exposure                      
Gross premiums written [1]                 98,311 100,523 96,187
Operating Segments | Talbot | Other location non-specific                      
Gross premiums written allocated to the territory of coverage exposure                      
Gross premiums written [3]                 352,708 418,070 478,601
Operating Segments | Western World Insurance Group, Inc                      
Gross premiums written allocated to the territory of coverage exposure                      
Gross premiums written                 323,220 278,504 65,235 [5]
Operating Segments | Western World Insurance Group, Inc | United States                      
Gross premiums written allocated to the territory of coverage exposure                      
Gross premiums written                 323,220 278,504 65,235
Operating Segments | Western World Insurance Group, Inc | Worldwide excluding United States                      
Gross premiums written allocated to the territory of coverage exposure                      
Gross premiums written [1]                 0 0 0
Operating Segments | Western World Insurance Group, Inc | Australia and New Zealand                      
Gross premiums written allocated to the territory of coverage exposure                      
Gross premiums written                 0 0 0
Operating Segments | Western World Insurance Group, Inc | Europe                      
Gross premiums written allocated to the territory of coverage exposure                      
Gross premiums written                 0 0 0
Operating Segments | Western World Insurance Group, Inc | Latin America and Caribbean                      
Gross premiums written allocated to the territory of coverage exposure                      
Gross premiums written                 0 0 0
Operating Segments | Western World Insurance Group, Inc | Japan                      
Gross premiums written allocated to the territory of coverage exposure                      
Gross premiums written                 0 0 0
Operating Segments | Western World Insurance Group, Inc | Canada                      
Gross premiums written allocated to the territory of coverage exposure                      
Gross premiums written                 0 0 0
Operating Segments | Western World Insurance Group, Inc | Rest of world                      
Gross premiums written allocated to the territory of coverage exposure                      
Gross premiums written [2]                 0 0 0
Operating Segments | Western World Insurance Group, Inc | Sub-total, non United States                      
Gross premiums written allocated to the territory of coverage exposure                      
Gross premiums written                 0 0 0
Operating Segments | Western World Insurance Group, Inc | Worldwide including United States                      
Gross premiums written allocated to the territory of coverage exposure                      
Gross premiums written [1]                 0 0 0
Operating Segments | Western World Insurance Group, Inc | Other location non-specific                      
Gross premiums written allocated to the territory of coverage exposure                      
Gross premiums written [3]                 0 0 0
Eliminations                      
Gross premiums written allocated to the territory of coverage exposure                      
Gross premiums written                 (26,673) (42,718) (53,457)
Eliminations | United States                      
Gross premiums written allocated to the territory of coverage exposure                      
Gross premiums written                 (2,057) (2,547) (3,664)
Eliminations | Worldwide excluding United States                      
Gross premiums written allocated to the territory of coverage exposure                      
Gross premiums written [1]                 (689) (1,186) (1,575)
Eliminations | Australia and New Zealand                      
Gross premiums written allocated to the territory of coverage exposure                      
Gross premiums written                 (133) (244) (360)
Eliminations | Europe                      
Gross premiums written allocated to the territory of coverage exposure                      
Gross premiums written                 (695) (1,135) (1,292)
Eliminations | Latin America and Caribbean                      
Gross premiums written allocated to the territory of coverage exposure                      
Gross premiums written                 (9,484) (15,481) (26,007)
Eliminations | Japan                      
Gross premiums written allocated to the territory of coverage exposure                      
Gross premiums written                 (33) (109) (111)
Eliminations | Canada                      
Gross premiums written allocated to the territory of coverage exposure                      
Gross premiums written                 (147) (231) (337)
Eliminations | Rest of world                      
Gross premiums written allocated to the territory of coverage exposure                      
Gross premiums written [2]                 (2,449) (3,660) (3,805)
Eliminations | Sub-total, non United States                      
Gross premiums written allocated to the territory of coverage exposure                      
Gross premiums written                 (13,630) (22,046) (33,487)
Eliminations | Worldwide including United States                      
Gross premiums written allocated to the territory of coverage exposure                      
Gross premiums written [1]                 (10,983) (18,120) (16,196)
Eliminations | Other location non-specific                      
Gross premiums written allocated to the territory of coverage exposure                      
Gross premiums written [3]                 $ (3) $ (5) $ (110)
[1] Represents risks in two or more geographic zones.
[2] Represents risks in one geographic zone.
[3] The other locations non-specific category refers to business for which an analysis of exposure by geographic zone is not applicable since these exposures can span multiple geographic areas and, in some instances, are not fixed locations.
[4] The results of AlphaCat are presented on an asset manager basis, which is non-GAAP. A reconciliation of Validus’ share of AlphaCat segment income to segmental income is presented in the tables below.
[5] The results of Western World have been included in the Company’s consolidated results from the October 2, 2014 date of acquisition.