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Operating Segment and Related Information - Long-term investments, Property and Equipment and Assets (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Revenues from External Customers and Long-Lived Assets [Line Items]    
Investments $ 3,381,193 $ 1,543,598
Property, Plant and Equipment—Net 369,771 374,660
Total Assets 6,729,997 3,217,691
United States    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Property, Plant and Equipment—Net 161,235 162,788
United Kingdom    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Property, Plant and Equipment—Net 202,847 204,866
Other    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Property, Plant and Equipment—Net 5,689 7,006
Operating Segments | Marine Services    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Investments 56,259 66,322
Total Assets 394,175 389,500
Operating Segments | Insurance    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Investments 3,319,123 1,493,589
Total Assets 5,480,165 2,117,045
Operating Segments | Life Sciences    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Investments 16,144 17,771
Total Assets 36,466 31,485
Operating Segments | Construction    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Investments 146 250
Total Assets 409,987 342,806
Operating Segments | Energy    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Total Assets 79,563 83,607
Operating Segments | Telecommunications    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Total Assets 105,910 114,445
Operating Segments | Broadcasting    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Total Assets 184,353 136,690
Operating Segments | Other    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Investments 6,312 1,518
Total Assets 6,320 2,674
Operating Segments | Non-operating Corporate    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Total Assets 55,849 35,291
Eliminations    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Investments (16,791) (35,852)
Total Assets $ (22,791) $ (35,852)