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Revenue - Schedule of Accounts Receivable (Details)
$ in Thousands
Sep. 30, 2018
USD ($)
Segment Reporting Information [Line Items]  
Total accounts receivables with customers $ 347,366
Construction  
Segment Reporting Information [Line Items]  
Total accounts receivables with customers 200,830
Marine Services  
Segment Reporting Information [Line Items]  
Total accounts receivables with customers 42,002
Energy  
Segment Reporting Information [Line Items]  
Total accounts receivables with customers 2,940
Telecommunications  
Segment Reporting Information [Line Items]  
Total accounts receivables with customers 90,978
Broadcasting  
Segment Reporting Information [Line Items]  
Total accounts receivables with customers 10,616
Other  
Segment Reporting Information [Line Items]  
Total accounts receivables with customers $ 0