Operations by Business Segment and Geographic Area - Financial Data By Business Segment (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Segment Reporting Information [Line Items]
Revenue	$ 2,661,161	$ 2,424,706	$ 2,066,084
Cost of services and products	2,175,667	2,025,735	1,758,707
Selling, general and administrative expense	239,224	217,643	196,514
Income from Operations	246,270	181,328	110,863
Depreciation, Depletion and Amortization	103,443	104,960	120,969
Depreciation	89,000	99,000	113,000
Interest income	12,124	15,425	5,708
Interest Expense, Operating and Nonoperating	(37,917)	(36,523)	(38,215)
Equity earnings of unconsolidated affiliates	929	2,061	1,707
Other Nonoperating Expense	3,510	(1,236)	(1,011)
Income (Loss), Including Portion Attributable to Noncontrolling Interest, before Tax	224,916	161,055	79,052
Property, Plant and Equipment, Additions	134,285	100,726	81,043
Subsea Robotics
Segment Reporting Information [Line Items]
Revenue	829,822	752,521	621,921
Cost of services and products	541,702	530,556	461,394
Selling, general and administrative expense	52,909	47,672	42,279
Income from Operations	235,211	174,293
Depreciation, Depletion and Amortization	48,916	54,365	67,684
Income (Loss), Including Portion Attributable to Noncontrolling Interest, before Tax	235,211	174,293	118,248
Property, Plant and Equipment, Additions	63,820
Subsea Robotics | Operating Segments
Segment Reporting Information [Line Items]
Income from Operations			118,248
Manufactured Products
Segment Reporting Information [Line Items]
Revenue	555,500	493,692	382,361
Cost of services and products	473,218	424,079	336,527
Selling, general and administrative expense	39,282	34,062	34,142
Income from Operations	43,000	35,551
Depreciation, Depletion and Amortization	12,452	12,220	11,946
Income (Loss), Including Portion Attributable to Noncontrolling Interest, before Tax	43,000	35,551	11,692
Property, Plant and Equipment, Additions	9,648
Manufactured Products | Operating Segments
Segment Reporting Information [Line Items]
Income from Operations			11,692
Offshore Projects Group
Segment Reporting Information [Line Items]
Revenue	591,037	546,366	489,317
Cost of services and products	482,467	449,426	410,944
Selling, general and administrative expense	34,871	32,394	29,117
Income from Operations	73,699	64,546
Depreciation, Depletion and Amortization	22,451	27,956	28,560
Income (Loss), Including Portion Attributable to Noncontrolling Interest, before Tax	73,699	64,546	49,256
Property, Plant and Equipment, Additions	18,595
Offshore Projects Group | Operating Segments
Segment Reporting Information [Line Items]
Income from Operations			49,256
Integrity Management & Digital Solutions
Segment Reporting Information [Line Items]
Revenue	291,866	255,282	229,884
Cost of services and products	254,902	216,294	193,160
Selling, general and administrative expense	27,137	25,615	21,823
Income from Operations	9,827	13,373
Depreciation, Depletion and Amortization	6,025	3,608	4,599
Income (Loss), Including Portion Attributable to Noncontrolling Interest, before Tax	9,827	13,373	14,901
Property, Plant and Equipment, Additions	30,899
Integrity Management & Digital Solutions | Operating Segments
Segment Reporting Information [Line Items]
Income from Operations			14,901
Aerospace and Defense Technologies
Segment Reporting Information [Line Items]
Revenue	392,936	376,845	342,601
Cost of services and products	322,101	306,425	274,154
Selling, general and administrative expense	28,634	25,417	24,279
Income from Operations	42,201	45,003
Depreciation, Depletion and Amortization	2,620	2,504	2,853
Income (Loss), Including Portion Attributable to Noncontrolling Interest, before Tax	42,201	45,003	44,168
Property, Plant and Equipment, Additions	5,443
Aerospace and Defense Technologies | Operating Segments
Segment Reporting Information [Line Items]
Income from Operations			44,168
Unallocated Expenses Member
Segment Reporting Information [Line Items]
Cost of services and products	101,277	98,955	82,528
Selling, general and administrative expense	56,391	52,483	44,874
Income from Operations	(157,668)	(151,438)	(127,402)
Depreciation, Depletion and Amortization	10,979	4,307	5,327
Interest income	12,124	15,425
Interest Expense, Operating and Nonoperating	(37,917)	(36,523)
Equity earnings of unconsolidated affiliates	929	2,061
Other Nonoperating Expense	3,510	(1,236)
Income (Loss), Including Portion Attributable to Noncontrolling Interest, before Tax	(179,022)	$ (171,711)	$ (159,213)
Other Operating Segment [Member]
Segment Reporting Information [Line Items]
Property, Plant and Equipment, Additions	$ 5,880