Revenue From Contracts With Customers - Disaggregation Of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Revenue From Contracts With Customers
Total Revenue	$ 342,419	$ 395,670	$ 1,003,427	$ 954,571
Intercompany Eliminations
Revenue From Contracts With Customers
Total Revenue	(17,064)	(17,084)	(55,998)	(43,834)
Well Intervention | Reportable Segments
Revenue From Contracts With Customers
Total Revenue	182,667	225,367	623,805	522,026
Well Intervention | Intercompany Eliminations
Revenue From Contracts With Customers
Total Revenue	(8,054)	(6,832)	(26,224)	(18,174)
Robotics | Reportable Segments
Revenue From Contracts With Customers
Total Revenue	84,526	75,646	216,084	194,918
Robotics | Intercompany Eliminations
Revenue From Contracts With Customers
Total Revenue	(8,972)	(10,252)	(29,548)	(25,634)
Shallow Water Abandonment | Reportable Segments
Revenue From Contracts With Customers
Total Revenue	71,595	87,272	149,289	212,959
Shallow Water Abandonment | Intercompany Eliminations
Revenue From Contracts With Customers
Total Revenue	(38)		(226)	(26)
Production Facilities | Reportable Segments
Revenue From Contracts With Customers
Total Revenue	20,695	24,469	70,247	68,502
Production maximization
Revenue From Contracts With Customers
Total Revenue	141,776	86,044	397,151	276,798
Production maximization | Intercompany Eliminations
Revenue From Contracts With Customers
Total Revenue	(9,791)	(4,079)	(29,002)	(12,504)
Production maximization | Well Intervention | Reportable Segments
Revenue From Contracts With Customers
Total Revenue	95,848	39,749	275,599	139,898
Production maximization | Robotics | Reportable Segments
Revenue From Contracts With Customers
Total Revenue	34,541	25,192	73,573	73,220
Production maximization | Shallow Water Abandonment | Reportable Segments
Revenue From Contracts With Customers
Total Revenue	483	713	6,734	7,682
Production maximization | Production Facilities | Reportable Segments
Revenue From Contracts With Customers
Total Revenue	20,695	24,469	70,247	68,502
Decommissioning
Revenue From Contracts With Customers
Total Revenue	153,249	256,954	478,959	577,375
Decommissioning | Intercompany Eliminations
Revenue From Contracts With Customers
Total Revenue	(3,469)	(7,805)	(14,038)	(17,819)
Decommissioning | Well Intervention | Reportable Segments
Revenue From Contracts With Customers
Total Revenue	82,860	161,977	335,185	350,773
Decommissioning | Robotics | Reportable Segments
Revenue From Contracts With Customers
Total Revenue	2,746	16,223	15,257	39,144
Decommissioning | Shallow Water Abandonment | Reportable Segments
Revenue From Contracts With Customers
Total Revenue	71,112	86,559	142,555	205,277
Renewables
Revenue From Contracts With Customers
Total Revenue	42,804	32,167	117,469	76,730
Renewables | Intercompany Eliminations
Revenue From Contracts With Customers
Total Revenue	(3,126)	(3,332)	(9,899)	(8,042)
Renewables | Well Intervention | Reportable Segments
Revenue From Contracts With Customers
Total Revenue	3,126	3,332	9,899	8,042
Renewables | Robotics | Reportable Segments
Revenue From Contracts With Customers
Total Revenue	42,804	32,167	117,469	76,730
Other
Revenue From Contracts With Customers
Total Revenue	4,590	20,505	9,848	23,668
Other | Intercompany Eliminations
Revenue From Contracts With Customers
Total Revenue	(678)	(1,868)	(3,059)	(5,469)
Other | Well Intervention | Reportable Segments
Revenue From Contracts With Customers
Total Revenue	833	20,309	3,122	23,313
Other | Robotics | Reportable Segments
Revenue From Contracts With Customers
Total Revenue	4,435	2,064	9,785	5,824
Short-term
Revenue From Contracts With Customers
Total Revenue	232,428	239,775	650,662	589,908
Short-term | Intercompany Eliminations
Revenue From Contracts With Customers
Total Revenue	(38)		(6,471)	(26)
Short-term | Well Intervention | Reportable Segments
Revenue From Contracts With Customers
Total Revenue	130,150	139,743	417,716	293,131
Short-term | Robotics | Reportable Segments
Revenue From Contracts With Customers
Total Revenue	48,906	26,995	118,275	100,269
Short-term | Shallow Water Abandonment | Reportable Segments
Revenue From Contracts With Customers
Total Revenue	53,410	73,037	121,142	196,534
Long-term
Revenue From Contracts With Customers
Total Revenue	109,991	155,895	352,765	364,663
Long-term | Intercompany Eliminations
Revenue From Contracts With Customers
Total Revenue	(17,026)	(17,084)	(49,527)	(43,808)
Long-term | Well Intervention | Reportable Segments
Revenue From Contracts With Customers
Total Revenue	52,517	85,624	206,089	228,895
Long-term | Robotics | Reportable Segments
Revenue From Contracts With Customers
Total Revenue	35,620	48,651	97,809	94,649
Long-term | Shallow Water Abandonment | Reportable Segments
Revenue From Contracts With Customers
Total Revenue	18,185	14,235	28,147	16,425
Long-term | Production Facilities | Reportable Segments
Revenue From Contracts With Customers
Total Revenue	$ 20,695	$ 24,469	$ 70,247	$ 68,502