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Revenue - Marine Segment Disaggregation of Revenue (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Segment Reporting Information [Line Items]        
Total revenue from contracts with customers $ 444,770 $ 368,672 $ 1,315,285 $ 1,063,597
Net revenue 501,356 $ 406,409 1,451,825 $ 1,175,629
Marine Services        
Segment Reporting Information [Line Items]        
Total revenue from contracts with customers 44,825   149,923  
Other revenue 0   0  
Net revenue 44,825   149,923  
Telecommunication - Maintenance | Marine Services        
Segment Reporting Information [Line Items]        
Total revenue from contracts with customers 21,944   65,816  
Telecommunication - Installation | Marine Services        
Segment Reporting Information [Line Items]        
Total revenue from contracts with customers 5,532   29,328  
Power - Operations, Maintenance & Construction Support | Marine Services        
Segment Reporting Information [Line Items]        
Total revenue from contracts with customers 9,304   25,889  
Power - Cable Installation & Repair | Marine Services        
Segment Reporting Information [Line Items]        
Total revenue from contracts with customers $ 8,045   $ 28,890