Operations by Business Segment and Geographic Area Operations by Business Segment and Geographic Areas - Schedule of Assets (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Segment Reporting, Asset Reconciling Item [Line Items]
Long-Lived Assets	$ 635,693	$ 732,313
Assets	1,962,859	2,045,842
Property, Plant and Equipment, Net	489,596	591,107
Goodwill	34,908	35,016
Corporate and Other [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Assets	647,708	569,241
Property, Plant and Equipment, Net	8,661	11,386
Subsea Robotics
Segment Reporting, Asset Reconciling Item [Line Items]
Assets	447,130	487,505
Property, Plant and Equipment, Net	190,992	252,221
Goodwill	24,454	24,562
Manufactured Products
Segment Reporting, Asset Reconciling Item [Line Items]
Assets	342,978	436,835
Property, Plant and Equipment, Net	85,190	94,600
Offshore Projects Group
Segment Reporting, Asset Reconciling Item [Line Items]
Assets	333,248	359,844
Property, Plant and Equipment, Net	186,187	212,990
Integrity Management & Digital Solutions
Segment Reporting, Asset Reconciling Item [Line Items]
Assets	83,796	80,123
Property, Plant and Equipment, Net	10,934	12,018
Aerospace and Defense Technologies
Segment Reporting, Asset Reconciling Item [Line Items]
Assets	107,999	112,294
Property, Plant and Equipment, Net	7,632	7,892
Goodwill	10,454	10,454
energy service and product
Segment Reporting, Asset Reconciling Item [Line Items]
Assets	1,207,152	1,364,307
Property, Plant and Equipment, Net	473,303	571,829
Goodwill	24,454	24,562
NORWAY
Segment Reporting, Asset Reconciling Item [Line Items]
Long-Lived Assets	69,880	85,844
Africa [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Long-Lived Assets	49,874	58,976
UNITED KINGDOM
Segment Reporting, Asset Reconciling Item [Line Items]
Long-Lived Assets	65,665	68,874
Asia Pacific [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Long-Lived Assets	29,371	40,746
BRAZIL
Segment Reporting, Asset Reconciling Item [Line Items]
Long-Lived Assets	59,318	68,314
Segment, Geographical, Groups of Countries, Group Three [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Long-Lived Assets	18,456	23,900
Segment, Geographical, Groups of Countries, Foreign [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Long-Lived Assets	292,564	346,654
UNITED STATES
Segment Reporting, Asset Reconciling Item [Line Items]
Long-Lived Assets	$ 343,129	$ 385,659