Business Segment Information - Financial Data By Business Segment (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023	Dec. 31, 2023
Segment Reporting Information [Line Items]
Goodwill	$ 34,033		$ 34,033		$ 34,214
Depreciation	22,000	$ 24,000	45,000	$ 50,000
Revenue	668,808	597,910	1,267,900	1,134,897
Income (Loss) from Operations	60,364	49,199	97,057	75,949
Depreciation, Depletion and Amortization	25,980	26,046	53,038	53,867
Amortization of Intangible Assets	3,900	1,800	7,600	3,500
Subsea Robotics Member
Segment Reporting Information [Line Items]
Revenue	214,985	186,512	401,917	355,673
Income (Loss) from Operations	61,750	42,227	105,987	75,881
Depreciation, Depletion and Amortization	11,981	13,356	24,791	28,296
Manufactured Products Member
Segment Reporting Information [Line Items]
Revenue	139,314	124,882	268,767	237,821
Income (Loss) from Operations	14,369	10,607	27,559	21,887
Depreciation, Depletion and Amortization	3,237	3,013	6,412	6,057
Offshore Projects Group
Segment Reporting Information [Line Items]
Revenue	144,058	130,547	259,112	234,854
Income (Loss) from Operations	13,248	17,132	14,092	22,646
Depreciation, Depletion and Amortization	5,584	6,976	12,019	14,104
Integrity Managements & Digital Solutions Member
Segment Reporting Information [Line Items]
Revenue	73,492	63,166	143,182	123,249
Income (Loss) from Operations	3,473	3,844	7,088	6,926
Depreciation, Depletion and Amortization	1,803	939	3,062	1,797
Aerospace and Defense Technologies Member
Segment Reporting Information [Line Items]
Revenue	96,959	92,803	194,922	183,300
Income (Loss) from Operations	7,244	11,357	20,052	19,853
Depreciation, Depletion and Amortization	616	632	1,219	1,285
Unallocated Expenses [Member]
Segment Reporting Information [Line Items]
Income (Loss) from Operations	(39,720)	(35,968)	(77,721)	(71,244)
Depreciation, Depletion and Amortization	2,759	1,130	5,535	2,328
Energy Segments
Segment Reporting Information [Line Items]
Revenue	571,849	505,107	1,072,978	951,597
Income (Loss) from Operations	92,840	73,810	154,726	127,340
Depreciation, Depletion and Amortization	$ 22,605	$ 24,284	$ 46,284	$ 50,254