Business Segment Information - Intercompany Segment Revenues (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Business Segment Information
Net revenues	$ (272,547)	$ (180,716)	$ (585,284)	$ (506,072)
Well Intervention
Business Segment Information
Net revenues	(143,925)	(131,314)	(356,583)	(397,387)
Robotics
Business Segment Information
Net revenues	(56,182)	(42,623)	(143,383)	(96,430)
Shallow Water Abandonment
Business Segment Information
Net revenues	(67,401)		(67,401)
Intercompany Eliminations
Business Segment Information
Net revenues	13,409	11,773	36,503	36,962
Intercompany Eliminations | Well Intervention
Business Segment Information
Net revenues	4,303	4,267	12,046	17,060
Intercompany Eliminations | Robotics
Business Segment Information
Net revenues	8,971	$ 7,506	24,322	$ 19,902
Intercompany Eliminations | Shallow Water Abandonment
Business Segment Information
Net revenues	$ 135		$ 135