Operations by Business Segment and Geographic Area - Financial Data By Business Segment (Details) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Sep. 30, 2020	Mar. 31, 2020	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Segment Reporting Information [Line Items]
Goodwill, Impairment Loss		$ 303,005	$ 0	$ 343,880	$ 14,713
Other Adjustments to Income, Discontinued Operations			1,308	21,210	11,751
Revenue			1,869,275	1,827,889	2,048,124
Income from Operations			39,799	(446,079)	(290,713)
Depreciation, Depletion and Amortization, Nonproduction			139,723	528,895	263,427
Depreciation			136,000	170,000	212,000
Impaired Assets to be Disposed of by Method Other than Sale, Amount of Impairment Loss				24,142	44,653
Write-off Equipment and Intangibles				14,000	45,000
Inventory Write-down			$ 0	$ 7,038	$ 21,285
Customer Concentration Risk [Member]
Segment Reporting Information [Line Items]
Concentration Risk, Percentage			12.00%	1000.00%	10.00%
Advanced Technologies [Member]
Segment Reporting Information [Line Items]
Goodwill, Impairment Loss		11,388
Subsea Robotics
Segment Reporting Information [Line Items]
Goodwill, Impairment Loss		102,118		$ 102,118	$ 0
Other Adjustments to Income, Discontinued Operations			$ 395	5,055	4,228
Revenue			538,515	493,332	583,652
Income from Operations			76,874	(65,817)	11,627
Depreciation, Depletion and Amortization			87,900	212,621	140,087
Impaired Assets to be Disposed of by Method Other than Sale, Amount of Impairment Loss				7,328	11,340
Inventory Write-down				7,038	15,433
Manufactured Products
Segment Reporting Information [Line Items]
Goodwill, Impairment Loss	$ 41,000	11,388		52,263	0
Other Adjustments to Income, Discontinued Operations			537	2,266	757
Revenue			344,251	477,419	498,350
Income from Operations			(15,876)	(88,253)	5,730
Depreciation, Depletion and Amortization			12,788	66,772	20,732
Impaired Assets to be Disposed of by Method Other than Sale, Amount of Impairment Loss					482
Inventory Write-down					2,107
Offshore Projects Group
Segment Reporting Information [Line Items]
Goodwill, Impairment Loss		66,285		66,285	0
Other Adjustments to Income, Discontinued Operations			149	8,590	3,526
Revenue			378,121	289,127	380,966
Income from Operations			31,197	(105,680)	(170,013)
Depreciation, Depletion and Amortization			28,173	115,288	58,044
Impaired Assets to be Disposed of by Method Other than Sale, Amount of Impairment Loss				16,644	18,723
Inventory Write-down					2,771
Integrity Management & Digital Solutions
Segment Reporting Information [Line Items]
Goodwill, Impairment Loss		$ 123,214		123,214	14,713
Other Adjustments to Income, Discontinued Operations			217	4,272	3,082
Revenue			241,393	226,938	266,086
Income from Operations			18,572	(121,675)	(52,527)
Depreciation, Depletion and Amortization			4,420	127,221	37,160
Impaired Assets to be Disposed of by Method Other than Sale, Amount of Impairment Loss				170	14,108
Inventory Write-down					719
Aerospace and Defense Technologies
Segment Reporting Information [Line Items]
Other Adjustments to Income, Discontinued Operations			10	572	102
Revenue			366,995	341,073	319,070
Income from Operations			60,992	56,023	42,574
Depreciation, Depletion and Amortization			4,783	2,666	2,644
Inventory Write-down					255
Unallocated Expenses Member
Segment Reporting Information [Line Items]
Other Adjustments to Income, Discontinued Operations			0	455	56
Income from Operations			(131,960)	(120,677)	(128,104)
Depreciation, Depletion and Amortization			1,659	4,327	4,760
energy service and product
Segment Reporting Information [Line Items]
Revenue			1,502,280	1,486,816	1,729,054
Income from Operations			110,767	(381,425)	(205,183)
Depreciation, Depletion and Amortization, Nonproduction			$ 133,281	$ 521,902	$ 256,023