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Business Segment Information - Total Assets By Reportable Segment (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Segment Reporting Information [Line Items]    
Total assets $ 2,347,730 $ 2,362,837
Reportable Segments | Well Intervention    
Segment Reporting Information [Line Items]    
Total assets 1,916,638 1,830,733
Reportable Segments | Robotics    
Segment Reporting Information [Line Items]    
Total assets 147,602 179,853
Reportable Segments | Production Facilities    
Segment Reporting Information [Line Items]    
Total assets 120,845 138,292
Corporate and Other    
Segment Reporting Information [Line Items]    
Total assets $ 162,645 $ 213,959