Segment Reporting (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024	Dec. 31, 2024
Segment Reporting Information [Line Items]
Revenues	$ 674,523	$ 599,092
Cost of services and products	539,512	506,708
Selling, general and administrative expense	61,539	55,691
Depreciation	21,000	23,000
Amortization of Intangible Assets	3,800	3,700
Depreciation, Depletion and Amortization	24,448	27,058
Segment, Expenditure, Addition to Long-Lived Assets	26,088	25,518
Income (Loss) from Operations	73,472	36,693
Interest income	3,644	3,040
Interest Expense, Operating and Nonoperating	(9,075)	(9,204)
Equity in income (losses) of unconsolidated affiliates	362	169
Other income (expense), net	975	1,480
Income (Loss), Including Portion Attributable to Noncontrolling Interest, before Tax	69,378	32,178
Assets	2,275,023	2,228,877	$ 2,336,347
Property, Plant and Equipment, Net	431,935	422,089	420,098
Goodwill	50,173	33,991	$ 49,350
Subsea Robotics Member
Segment Reporting Information [Line Items]
Revenues	205,976	186,932
Cost of services and products	133,562	130,156
Selling, general and administrative expense	12,782	12,539
Depreciation, Depletion and Amortization	11,736	12,810
Segment, Expenditure, Addition to Long-Lived Assets	18,916	15,797
Income (Loss) from Operations	59,632	44,237
Income (Loss), Including Portion Attributable to Noncontrolling Interest, before Tax	59,632	44,237
Manufactured Products Member
Segment Reporting Information [Line Items]
Revenues	135,037	129,453
Cost of services and products	117,667	106,992
Selling, general and administrative expense	8,703	9,271
Depreciation, Depletion and Amortization	2,650	3,175
Segment, Expenditure, Addition to Long-Lived Assets	784	5,137
Income (Loss) from Operations	8,667	13,190
Income (Loss), Including Portion Attributable to Noncontrolling Interest, before Tax	8,667	13,190
Integrity Managements & Digital Solutions Member
Segment Reporting Information [Line Items]
Revenues	71,418	69,690
Cost of services and products	60,888	59,794
Selling, general and administrative expense	7,068	6,281
Depreciation, Depletion and Amortization	1,730	1,259
Segment, Expenditure, Addition to Long-Lived Assets	1,451	608
Income (Loss) from Operations	3,462	3,615
Income (Loss), Including Portion Attributable to Noncontrolling Interest, before Tax	3,462	3,615
Offshore Projects Group
Segment Reporting Information [Line Items]
Revenues	164,941	115,054
Cost of services and products	120,063	106,086
Selling, general and administrative expense	9,212	8,124
Depreciation, Depletion and Amortization	4,689	6,435
Segment, Expenditure, Addition to Long-Lived Assets	4,295	1,730
Income (Loss) from Operations	35,666	844
Income (Loss), Including Portion Attributable to Noncontrolling Interest, before Tax	35,666	844
Assets	502,808	539,531
Property, Plant and Equipment, Net	127,900	130,165
Goodwill	0	0
Aerospace and Defense Technologies Member
Segment Reporting Information [Line Items]
Revenues	97,151	97,963
Cost of services and products	79,493	79,160
Selling, general and administrative expense	6,993	5,995
Depreciation, Depletion and Amortization	833	603
Segment, Expenditure, Addition to Long-Lived Assets	600	1,656
Income (Loss) from Operations	10,665	12,808
Income (Loss), Including Portion Attributable to Noncontrolling Interest, before Tax	10,665	12,808
Unallocated Expenses [Member]
Segment Reporting Information [Line Items]
Depreciation, Depletion and Amortization	2,810	2,776
Segment, Expenditure, Addition to Long-Lived Assets	42	590
Unallocated Expense Member
Segment Reporting Information [Line Items]
Cost of services and products	27,839	24,520
Selling, general and administrative expense	16,781	13,481
Income (Loss) from Operations	(44,620)	(38,001)
Interest income	3,644	3,040
Interest Expense, Operating and Nonoperating	(9,075)	(9,204)
Equity in income (losses) of unconsolidated affiliates	362	169
Other income (expense), net	975	1,480
Income (Loss), Including Portion Attributable to Noncontrolling Interest, before Tax	(48,714)	(42,516)
Subsea Robotics
Segment Reporting Information [Line Items]
Assets	493,890	481,678
Property, Plant and Equipment, Net	208,303	189,037
Goodwill	23,557	23,537
Manufactured Products
Segment Reporting Information [Line Items]
Assets	345,894	374,368
Property, Plant and Equipment, Net	61,828	70,198
Goodwill	0	0
Integrity Management & Digital Solutions
Segment Reporting Information [Line Items]
Assets	128,670	97,940
Property, Plant and Equipment, Net	16,005	13,544
Goodwill	16,162	0
Aerospace and Defense Technologies
Segment Reporting Information [Line Items]
Assets	144,178	121,562
Property, Plant and Equipment, Net	6,805	8,404
Goodwill	10,454	10,454
Corporate Segment
Segment Reporting Information [Line Items]
Assets	659,583	613,798
Property, Plant and Equipment, Net	11,094	10,741
Goodwill	$ 0	$ 0