Revenue From Contracts With Customers - Disaggregation Of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Revenue From Contracts With Customers
Total Revenue	$ 296,211	$ 250,084
Intercompany Eliminations
Revenue From Contracts With Customers
Total Revenue	(21,562)	(11,862)
Well Intervention | Reportable Segments
Revenue From Contracts With Customers
Total Revenue	216,459	142,438
Well Intervention | Intercompany Eliminations
Revenue From Contracts With Customers
Total Revenue	(11,252)	(4,469)
Robotics | Reportable Segments
Revenue From Contracts With Customers
Total Revenue	50,309	49,222
Robotics | Intercompany Eliminations
Revenue From Contracts With Customers
Total Revenue	(10,228)	(7,393)
Shallow Water Abandonment | Reportable Segments
Revenue From Contracts With Customers
Total Revenue	26,853	49,381
Shallow Water Abandonment | Intercompany Eliminations
Revenue From Contracts With Customers
Total Revenue	(82)
Production Facilities | Reportable Segments
Revenue From Contracts With Customers
Total Revenue	24,152	20,905
Production maximization
Revenue From Contracts With Customers
Total Revenue	104,887	94,481
Production maximization | Intercompany Eliminations
Revenue From Contracts With Customers
Total Revenue	(11,392)	(3,817)
Production maximization | Well Intervention | Reportable Segments
Revenue From Contracts With Customers
Total Revenue	70,449	47,267
Production maximization | Robotics | Reportable Segments
Revenue From Contracts With Customers
Total Revenue	18,436	26,719
Production maximization | Shallow Water Abandonment | Reportable Segments
Revenue From Contracts With Customers
Total Revenue	3,242	3,407
Production maximization | Production Facilities | Reportable Segments
Revenue From Contracts With Customers
Total Revenue	24,152	20,905
Decommissioning
Revenue From Contracts With Customers
Total Revenue	164,780	144,571
Decommissioning | Intercompany Eliminations
Revenue From Contracts With Customers
Total Revenue	(6,928)	(5,071)
Decommissioning | Well Intervention | Reportable Segments
Revenue From Contracts With Customers
Total Revenue	142,685	92,620
Decommissioning | Robotics | Reportable Segments
Revenue From Contracts With Customers
Total Revenue	5,412	11,048
Decommissioning | Shallow Water Abandonment | Reportable Segments
Revenue From Contracts With Customers
Total Revenue	23,611	45,974
Renewables
Revenue From Contracts With Customers
Total Revenue	24,172	8,678
Renewables | Intercompany Eliminations
Revenue From Contracts With Customers
Total Revenue	(2,504)	(1,326)
Renewables | Well Intervention | Reportable Segments
Revenue From Contracts With Customers
Total Revenue	2,504	1,326
Renewables | Robotics | Reportable Segments
Revenue From Contracts With Customers
Total Revenue	24,172	8,678
Other
Revenue From Contracts With Customers
Total Revenue	2,372	2,354
Other | Intercompany Eliminations
Revenue From Contracts With Customers
Total Revenue	(738)	(1,648)
Other | Well Intervention | Reportable Segments
Revenue From Contracts With Customers
Total Revenue	821	1,225
Other | Robotics | Reportable Segments
Revenue From Contracts With Customers
Total Revenue	2,289	2,777
Short-term
Revenue From Contracts With Customers
Total Revenue	178,626	162,353
Short-term | Intercompany Eliminations
Revenue From Contracts With Customers
Total Revenue	(6,327)
Short-term | Well Intervention | Reportable Segments
Revenue From Contracts With Customers
Total Revenue	134,414	77,767
Short-term | Robotics | Reportable Segments
Revenue From Contracts With Customers
Total Revenue	25,176	35,205
Short-term | Shallow Water Abandonment | Reportable Segments
Revenue From Contracts With Customers
Total Revenue	25,363	49,381
Long-term
Revenue From Contracts With Customers
Total Revenue	117,585	87,731
Long-term | Intercompany Eliminations
Revenue From Contracts With Customers
Total Revenue	(15,235)	(11,862)
Long-term | Well Intervention | Reportable Segments
Revenue From Contracts With Customers
Total Revenue	82,045	64,671
Long-term | Robotics | Reportable Segments
Revenue From Contracts With Customers
Total Revenue	25,133	14,017
Long-term | Shallow Water Abandonment | Reportable Segments
Revenue From Contracts With Customers
Total Revenue	1,490
Long-term | Production Facilities | Reportable Segments
Revenue From Contracts With Customers
Total Revenue	$ 24,152	$ 20,905