Quarterly report pursuant to Section 13 or 15(d)

Segment Information - Additional Information (Details)

v3.19.1
Segment Information - Additional Information (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Segment Information [Line Items]    
Equity method investments $ 119,500  
Equity in (Losses) Earnings of 50% or Less Owned Companies $ (3,397) $ 208
Maximum    
Segment Information [Line Items]    
Equity method investment, ownership percentage 50.00%  
Other Offshore Marine Services Joint Ventures    
Segment Information [Line Items]    
Equity method investment, ownership percentage 50.00%  
Equity method investments $ 112,200  
Other Offshore Marine Services Joint Ventures | Maximum    
Segment Information [Line Items]    
Equity method investment, ownership percentage 50.00%