Segment Reporting (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024	Dec. 31, 2024
Segment Reporting Information [Line Items]
Revenues	$ 742,898	$ 679,811	$ 2,115,582	$ 1,947,711
Cost of services and products	590,166	548,849	1,679,412	1,604,154
Selling, general and administrative expense	66,224	59,629	197,001	175,167
Depreciation	22,000	22,000	64,000	67,000
Amortization of Intangible Assets	4,100	3,300	12,000	11,000
Depreciation, Depletion and Amortization	26,123	25,263	75,971	78,301
Segment, Expenditure, Addition to Long-Lived Assets	24,215	24,886	80,575	73,262
Income (Loss) from Operations	86,508	71,333	239,169	168,390
Interest income	3,704	3,275	10,365	8,717
Interest Expense, Operating and Nonoperating	(9,381)	(9,456)	(27,928)	(28,176)
Equity in income (losses) of unconsolidated affiliates	97	323	770	787
Other income (expense), net	(1,021)	3,133	5,325	6,372
Income (Loss), Including Portion Attributable to Noncontrolling Interest, before Tax	79,907	68,608	227,701	156,090
Assets	2,539,318	2,356,493	2,539,318	2,356,493	$ 2,336,347
Property, Plant and Equipment, Net	442,274	423,579	442,274	423,579	420,098
Goodwill	51,039	34,111	51,039	34,111	$ 49,350
Subsea Robotics Member
Segment Reporting Information [Line Items]
Revenues	218,767	215,715	643,529	617,632
Cost of services and products	139,162	136,688	411,563	406,925
Selling, general and administrative expense	14,463	13,329	42,687	39,022
Depreciation, Depletion and Amortization	13,283	12,076	37,404	36,867
Segment, Expenditure, Addition to Long-Lived Assets	12,707	17,603	52,423	45,522
Income (Loss) from Operations	65,142	65,698	189,279	171,685
Income (Loss), Including Portion Attributable to Noncontrolling Interest, before Tax	65,142	65,698	189,279	171,685
Manufactured Products Member
Segment Reporting Information [Line Items]
Revenues	156,395	143,734	436,566	412,501
Cost of services and products	121,415	122,714	355,556	344,795
Selling, general and administrative expense	10,329	9,742	28,920	28,869
Depreciation, Depletion and Amortization	2,768	3,061	8,159	9,473
Segment, Expenditure, Addition to Long-Lived Assets	2,080	1,335	3,413	7,648
Income (Loss) from Operations	24,651	11,278	52,090	38,837
Income (Loss), Including Portion Attributable to Noncontrolling Interest, before Tax	24,651	11,278	52,090	38,837
Integrity Managements & Digital Solutions Member
Segment Reporting Information [Line Items]
Revenues	70,781	73,622	217,566	216,804
Cost of services and products	60,206	66,047	183,976	189,579
Selling, general and administrative expense	7,819	6,861	22,725	19,423
Depreciation, Depletion and Amortization	1,830	1,348	5,399	4,410
Segment, Expenditure, Addition to Long-Lived Assets	871	1,162	2,837	3,256
Income (Loss) from Operations	2,756	714	10,865	7,802
Income (Loss), Including Portion Attributable to Noncontrolling Interest, before Tax	2,756	714	10,865	7,802
Offshore Projects Group
Segment Reporting Information [Line Items]
Revenues	171,046	147,539	485,268	406,651
Cost of services and products	137,757	118,697	375,127	346,676
Selling, general and administrative expense	9,597	8,548	29,120	25,589
Depreciation, Depletion and Amortization	4,290	5,399	13,642	17,418
Segment, Expenditure, Addition to Long-Lived Assets	3,553	2,358	13,658	8,594
Income (Loss) from Operations	23,692	20,294	81,021	34,386
Income (Loss), Including Portion Attributable to Noncontrolling Interest, before Tax	23,692	20,294	81,021	34,386
Assets	615,101	550,519	615,101	550,519
Property, Plant and Equipment, Net	130,354	125,108	130,354	125,108
Goodwill	0	0	0	0
Aerospace and Defense Technologies Member
Segment Reporting Information [Line Items]
Revenues	125,909	99,201	332,653	294,123
Cost of services and products	101,922	79,698		241,143
Selling, general and administrative expense	7,430	7,284	22,077	20,709
Depreciation, Depletion and Amortization	1,082	696	2,815	1,915
Segment, Expenditure, Addition to Long-Lived Assets	1,270	1,418	3,121	3,880
Income (Loss) from Operations	16,557	12,219	43,521	32,271
Income (Loss), Including Portion Attributable to Noncontrolling Interest, before Tax	16,557	12,219	43,521	32,271
Unallocated Expenses [Member]
Segment Reporting Information [Line Items]
Depreciation, Depletion and Amortization	2,870	2,683	8,552	8,218
Segment, Expenditure, Addition to Long-Lived Assets	3,734	1,010	5,123	4,362
Unallocated Expense Member
Segment Reporting Information [Line Items]
Cost of services and products	29,704	25,005	86,135	75,036
Selling, general and administrative expense	16,586	13,865	51,472	41,555
Income (Loss) from Operations	(46,290)	(38,870)	(137,607)	(116,591)
Interest income	3,704	3,275	10,365	8,717
Interest Expense, Operating and Nonoperating	(9,381)	(9,456)	(27,928)	(28,176)
Equity in income (losses) of unconsolidated affiliates	97	323	770	787
Other income (expense), net	(1,021)	3,133	5,325	6,372
Income (Loss), Including Portion Attributable to Noncontrolling Interest, before Tax	(52,891)	(41,595)	(149,075)	(128,891)
Subsea Robotics
Segment Reporting Information [Line Items]
Assets	552,015	559,928	552,015	559,928
Property, Plant and Equipment, Net	214,912	197,244	214,912	197,244
Goodwill	23,814	23,657	23,814	23,657
Manufactured Products
Segment Reporting Information [Line Items]
Assets	412,310	403,198	412,310	403,198
Property, Plant and Equipment, Net	60,974	64,739	60,974	64,739
Goodwill	0	0	0	0
Integrity Management & Digital Solutions
Segment Reporting Information [Line Items]
Assets	146,285	122,658	146,285	122,658
Property, Plant and Equipment, Net	14,996	15,057	14,996	15,057
Goodwill	16,771	0	16,771	0
Aerospace and Defense Technologies
Segment Reporting Information [Line Items]
Cost of services and products			267,055
Assets	144,664	134,435	144,664	134,435
Property, Plant and Equipment, Net	7,237	9,338	7,237	9,338
Goodwill	10,454	10,454	10,454	10,454
Corporate Segment
Segment Reporting Information [Line Items]
Assets	668,943	585,755	668,943	585,755
Property, Plant and Equipment, Net	13,801	12,093	13,801	12,093
Goodwill	$ 0	$ 0	$ 0	$ 0