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Acquisitions, Dispositions, and Deconsolidations - Other Segments (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Oct. 31, 2020
Feb. 28, 2020
Jan. 30, 2020
Oct. 30, 2019
Dec. 31, 2020
Dec. 31, 2020
Dec. 31, 2019
May 12, 2020
Business Acquisition [Line Items]                
Cash received from dispositions, net           $ 147,400 $ 13,500  
Gain (Loss) on sale of subsidiary           (44,200) 0  
Loss on disposal of subsidiary           (30,300) 0  
Gain on sale of equity method investments           71,100 8,100  
Foreign           9,500 1,400  
Foreign currency translation adjustment           (7,900) $ 1,900  
Marine Services                
Business Acquisition [Line Items]                
Ownership percentage before sale of stock     100.00%          
Consideration to be received     $ 250,000 $ 140,000        
Potential earn-out, maximum     12,500          
Consideration held in escrow for future losses payable     1,250          
Consideration held of escrow for purchase price adjustment     1,910          
Consideration to be paid on the earlier of December 31, 2020 or the date on which a cash collateralized bond in connection with Company's bonding facility is released     $ 2,400          
Proceeds from divestiture of businesses   $ 144,000       85,500    
Cash received from dispositions, net   100,800            
Gain (Loss) on sale of subsidiary   (39,300)     $ 2,400      
Loss on disposal of subsidiary   31,300            
Gain on sale of equity method investments           71,100    
Foreign           7,200    
Marine Services | Put Option                
Business Acquisition [Line Items]                
Gain on sale of equity method investments           11,300    
Marine Services | Non- controlling Interest                
Business Acquisition [Line Items]                
Proceeds from divestiture of businesses           17,500    
Cash divested from deconsolidation   36,800            
Marine Services | Noncontrolling Interest Redeemable                
Business Acquisition [Line Items]                
Proceeds from divestiture of businesses           2,100    
Cash divested from deconsolidation   $ 5,500            
Huawei Marine Networks                
Business Acquisition [Line Items]                
Consideration to be received       $ 285,000        
ICS                
Business Acquisition [Line Items]                
Gain (Loss) on sale of subsidiary $ 900              
Foreign currency translation adjustment $ 8,200              
Beyond6                
Business Acquisition [Line Items]                
Consideration to be received         $ 70,000 $ 70,000    
New Saxon 2019 Limited                
Business Acquisition [Line Items]                
Parents interest, controlling     73.00%         19.00%
Huawei Marine Networks                
Business Acquisition [Line Items]                
Ownership percentage before sale of stock       49.00%        
Marine Services                
Business Acquisition [Line Items]                
Parents interest, controlling       49.00% 73.00% 73.00%   30.00%