Business Segment Information - Measure of segment profit or loss (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Segment Reporting Information [Line Items]
Total Revenue	$ 1,358,560	$ 1,289,728	$ 873,100
Less:
Direct cost of revenues	(1,138,996)	(1,089,372)	(822,484)
Selling, general and administrative expenses	(91,650)	(94,427)	(76,753)
Other segment items	479	(367)
Income (loss) from operations	127,435	63,510	(44,855)
Reportable Segments
Less:
Income (loss) from operations	182,565	171,920	26,310
Intercompany Eliminations
Segment Reporting Information [Line Items]
Total Revenue	(44,668)	(38,704)	(34,277)
Reportable Segment, Aggregation before Other Operating Segment
Segment Reporting Information [Line Items]
Total Revenue	1,358,560	1,289,728	873,100
Reportable Segment, Aggregation before Other Operating Segment | Reportable Segments
Segment Reporting Information [Line Items]
Total Revenue	1,403,228	1,328,432	907,377
Reportable Segment, Aggregation before Other Operating Segment | Intercompany Eliminations
Segment Reporting Information [Line Items]
Total Revenue	44,668	38,704	34,277
Well Intervention
Segment Reporting Information [Line Items]
Total Revenue	823,472	704,365	507,696
Well Intervention | Reportable Segments
Segment Reporting Information [Line Items]
Total Revenue	829,862	707,718	508,331
Less:
Direct cost of revenues	(704,120)	(646,127)	(536,923)
Operations support	(15,130)	(14,427)	(11,515)
Selling, general and administrative expenses	(16,991)	(14,766)	(12,949)
Other segment items	(416)
Income (loss) from operations	93,205	32,398	(53,056)
Well Intervention | Intercompany Eliminations
Segment Reporting Information [Line Items]
Total Revenue	6,390	3,353	635
Well Intervention | Material reconciling
Segment Reporting Information [Line Items]
Total Revenue	(27,600)	(25,000)	(15,900)
Robotics
Segment Reporting Information [Line Items]
Total Revenue	259,639	222,612	158,279
Robotics | Reportable Segments
Segment Reporting Information [Line Items]
Total Revenue	297,678	257,875	191,921
Less:
Direct cost of revenues	(203,849)	(192,419)	(150,020)
Operations support	(5,542)	(4,838)	(4,394)
Selling, general and administrative expenses	(10,944)	(8,468)	(7,526)
Other segment items		300
Income (loss) from operations	77,343	52,450	29,981
Robotics | Intercompany Eliminations
Segment Reporting Information [Line Items]
Total Revenue	38,039	35,263	33,642
Shallow Water Abandonment
Segment Reporting Information [Line Items]
Total Revenue	186,740	274,866	124,810
Shallow Water Abandonment | Reportable Segments
Segment Reporting Information [Line Items]
Total Revenue	186,979	274,954	124,810
Less:
Direct cost of revenues	(175,111)	(186,873)	(92,036)
Operations support	(12,645)	(16,820)	(8,855)
Selling, general and administrative expenses	(8,396)	(5,088)	(1,735)
Other segment items	(150)	67
Income (loss) from operations	(9,323)	66,240	22,184
Shallow Water Abandonment | Intercompany Eliminations
Segment Reporting Information [Line Items]
Total Revenue	239	88
Production Facilities
Segment Reporting Information [Line Items]
Total Revenue	88,709	87,885	82,315
Production Facilities | Reportable Segments
Segment Reporting Information [Line Items]
Total Revenue	88,709	87,885	82,315
Less:
Direct cost of revenues	(64,429)	(63,785)	(51,165)
Operations support	(514)	(606)	(484)
Selling, general and administrative expenses	(2,513)	(2,662)	(3,465)
Other segment items	87
Income (loss) from operations	$ 21,340	$ 20,832	$ 27,201