Business Segment Information - Measure of segment profit or loss (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Segment Reporting Information [Line Items]
Total Revenue	$ 302,288	$ 364,797	$ 580,352	$ 661,008
Less:
Direct cost of revenues	(287,340)	(289,311)	(537,866)	(565,968)
Selling, general and administrative expenses	(18,100)	(22,293)	(37,466)	(42,973)
Other segment items				150
Income (loss) from operations	(3,152)	53,193	5,020	51,917
Reportable Segments
Less:
Income (loss) from operations	6,682	66,515	25,502	76,673
Intercompany Eliminations
Segment Reporting Information [Line Items]
Total Revenue	(7,769)	(10,454)	(15,776)	(26,857)
Reportable Segment, Aggregation before Other Operating Segment
Segment Reporting Information [Line Items]
Total Revenue	302,288	364,797	580,352	661,008
Reportable Segment, Aggregation before Other Operating Segment | Reportable Segments
Segment Reporting Information [Line Items]
Total Revenue	310,057	375,251	596,128	687,865
Reportable Segment, Aggregation before Other Operating Segment | Intercompany Eliminations
Segment Reporting Information [Line Items]
Total Revenue	7,769	10,454	15,776	26,857
Well Intervention
Segment Reporting Information [Line Items]
Total Revenue	156,786	217,761	355,160	422,968
Well Intervention | Reportable Segments
Segment Reporting Information [Line Items]
Total Revenue	156,786	217,761	355,160	429,061
Less:
Direct cost of revenues	(165,154)	(180,529)	(335,187)	(364,722)
Operations support	(3,938)	(3,617)	(7,957)	(7,580)
Selling, general and administrative expenses	(4,124)	(4,316)	(8,476)	(8,781)
Income (loss) from operations	(16,430)	29,299	3,540	47,978
Well Intervention | Intercompany Eliminations
Segment Reporting Information [Line Items]
Total Revenue				6,093
Well Intervention | Material reconciling
Segment Reporting Information [Line Items]
Total Revenue		6,900		12,100
Robotics
Segment Reporting Information [Line Items]
Total Revenue	77,815	70,901	120,902	110,982
Robotics | Reportable Segments
Segment Reporting Information [Line Items]
Total Revenue	85,572	81,249	136,614	131,558
Less:
Direct cost of revenues	(62,573)	(49,111)	(104,208)	(89,824)
Operations support	(1,345)	(1,250)	(2,736)	(2,663)
Selling, general and administrative expenses	(2,610)	(2,488)	(5,279)	(5,221)
Income (loss) from operations	19,044	28,400	24,391	33,850
Robotics | Intercompany Eliminations
Segment Reporting Information [Line Items]
Total Revenue	7,757	10,348	15,712	20,576
Shallow Water Abandonment
Segment Reporting Information [Line Items]
Total Revenue	50,606	50,735	67,372	77,506
Shallow Water Abandonment | Reportable Segments
Segment Reporting Information [Line Items]
Total Revenue	50,618	50,841	67,436	77,694
Less:
Direct cost of revenues	(46,460)	(45,909)	(71,999)	(79,133)
Operations support	(2,664)	(3,278)	(5,525)	(6,670)
Selling, general and administrative expenses	(1,851)	(1,935)	(3,710)	(4,450)
Other segment items				(150)
Income (loss) from operations	(357)	(281)	(13,798)	(12,709)
Shallow Water Abandonment | Intercompany Eliminations
Segment Reporting Information [Line Items]
Total Revenue	12	106	64	188
Production Facilities
Segment Reporting Information [Line Items]
Total Revenue	17,081	25,400	36,918	49,552
Production Facilities | Reportable Segments
Segment Reporting Information [Line Items]
Total Revenue	17,081	25,400	36,918	49,552
Less:
Direct cost of revenues	(12,173)	(15,384)	(24,437)	(40,699)
Operations support	(154)	(125)	(267)	(268)
Selling, general and administrative expenses	(329)	(794)	(845)	(1,031)
Income (loss) from operations	$ 4,425	$ 9,097	$ 11,369	$ 7,554