Business Segment Information - Measure of segment profit or loss (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Segment Reporting Information [Line Items]
Total Revenue	$ 278,064	$ 296,211
Less:
Direct cost of revenues	(250,526)	(276,657)
Selling, general and administrative expenses	(19,366)	(20,680)
Other segment items		150
Income (loss) from operations	8,172	(1,276)
Reportable Segments
Less:
Income (loss) from operations	18,820	10,158
Intercompany Eliminations
Segment Reporting Information [Line Items]
Total Revenue	(8,007)	(16,403)
Reportable Segment, Aggregation before Other Operating Segment
Segment Reporting Information [Line Items]
Total Revenue	278,064	296,211
Reportable Segment, Aggregation before Other Operating Segment | Reportable Segments
Segment Reporting Information [Line Items]
Total Revenue	286,071	312,614
Reportable Segment, Aggregation before Other Operating Segment | Intercompany Eliminations
Segment Reporting Information [Line Items]
Total Revenue	8,007	16,403
Well Intervention
Segment Reporting Information [Line Items]
Total Revenue	198,374	205,207
Well Intervention | Reportable Segments
Segment Reporting Information [Line Items]
Total Revenue	198,374	211,300
Less:
Direct cost of revenues	(170,033)	(184,193)
Operations support	(4,019)	(3,963)
Selling, general and administrative expenses	(4,352)	(4,465)
Income (loss) from operations	19,970	18,679
Well Intervention | Intercompany Eliminations
Segment Reporting Information [Line Items]
Total Revenue		6,093
Well Intervention | Material reconciling
Segment Reporting Information [Line Items]
Total Revenue		5,200
Robotics
Segment Reporting Information [Line Items]
Total Revenue	43,087	40,081
Robotics | Reportable Segments
Segment Reporting Information [Line Items]
Total Revenue	51,042	50,309
Less:
Direct cost of revenues	(41,635)	(40,713)
Operations support	(1,391)	(1,413)
Selling, general and administrative expenses	(2,669)	(2,733)
Income (loss) from operations	5,347	5,450
Robotics | Intercompany Eliminations
Segment Reporting Information [Line Items]
Total Revenue	7,955	10,228
Shallow Water Abandonment
Segment Reporting Information [Line Items]
Total Revenue	16,766	26,771
Shallow Water Abandonment | Reportable Segments
Segment Reporting Information [Line Items]
Total Revenue	16,818	26,853
Less:
Direct cost of revenues	(25,539)	(33,224)
Operations support	(2,861)	(3,392)
Selling, general and administrative expenses	(1,859)	(2,515)
Other segment items		(150)
Income (loss) from operations	(13,441)	(12,428)
Shallow Water Abandonment | Intercompany Eliminations
Segment Reporting Information [Line Items]
Total Revenue	52	82
Production Facilities
Segment Reporting Information [Line Items]
Total Revenue	19,837	24,152
Production Facilities | Reportable Segments
Segment Reporting Information [Line Items]
Total Revenue	19,837	24,152
Less:
Direct cost of revenues	(12,264)	(25,315)
Operations support	(113)	(143)
Selling, general and administrative expenses	(516)	(237)
Income (loss) from operations	$ 6,944	$ (1,543)