Business Segment Information - Total Assets By Reportable Segment (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Segment Reporting Information [Line Items]
Total assets	$ 2,514,151	$ 2,596,731
Corporate and Other
Segment Reporting Information [Line Items]
Total assets	102,431	122,449
Well Intervention | Reportable Segments
Segment Reporting Information [Line Items]
Total assets	2,134,796	2,180,180
Robotics | Reportable Segments
Segment Reporting Information [Line Items]
Total assets	136,845	151,478
Production Facilities | Reportable Segments
Segment Reporting Information [Line Items]
Total assets	$ 140,079	$ 142,624