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Operations by Business Segment and Geographic Area - Narrative (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2021
Sep. 30, 2020
Mar. 31, 2020
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Segment Reporting, Measurement Disclosures [Abstract]            
Financial Data By Business Segment        
The table that follows presents revenue, income (loss) from operations and depreciation and amortization expense including goodwill impairment, by business segment: 
 Year Ended December 31,
(in thousands)202120202019
Revenue
Energy Services and Products
Subsea Robotics$538,515 $493,332 $583,652 
Manufactured Products344,251 477,419 498,350 
OPG378,121 289,127 380,966 
IMDS241,393 226,938 266,086 
Total Energy Services and Products1,502,280 1,486,816 1,729,054 
ADTech366,995 341,073 319,070 
Total$1,869,275 $1,827,889 $2,048,124 
Income (Loss) from Operations
Energy Services and Products
Subsea Robotics$76,874 $(65,817)$11,627 
Manufactured Products(15,876)(88,253)5,730 
OPG31,197 (105,680)(170,013)
IMDS18,572 (121,675)(52,527)
Total Energy Services and Products110,767 (381,425)(205,183)
ADTech60,992 56,023 42,574 
Unallocated Expenses(131,960)(120,677)(128,104)
Total$39,799 $(446,079)$(290,713)
Depreciation and Amortization Expense, including Goodwill Impairment
Energy Services and Products
Subsea Robotics$87,900 $212,621 $140,087 
Manufactured Products12,788 66,772 20,732 
OPG28,173 115,288 58,044 
IMDS4,420 127,221 37,160 
Total Energy Services and Products133,281 521,902 256,023 
ADTech4,783 2,666 2,644 
Unallocated Expenses1,659 4,327 4,760 
Total$139,723 $528,895 $263,427 
  
Reconciliation of Assets from Segment to Consolidated        
The following table presents Assets, Property and Equipment, net and Goodwill by business segment: 
 December 31,
(in thousands)20212020
Assets
Energy Services and Products
Subsea Robotics$447,130 $487,505 
Manufactured Products342,978 436,835 
OPG333,248 359,844 
IMDS83,796 80,123 
Total Energy Services and Products1,207,152 1,364,307 
ADTech107,999 112,294 
Corporate and Other647,708 569,241 
Total$1,962,859 $2,045,842 
Property and Equipment, Net
Energy Services and Products
Subsea Robotics$190,992 $252,221 
Manufactured Products85,190 94,600 
OPG186,187 212,990 
IMDS10,934 12,018 
Total Energy Services and Products473,303 571,829 
ADTech7,632 7,892 
Corporate and Other8,661 11,386 
Total$489,596 $591,107 
Goodwill
Energy Services and Products
Subsea Robotics$24,454 $24,562 
Total Energy Services and Products24,454 24,562 
ADTech10,454 10,454 
Total$34,908 $35,016 
All assets specifically identified with a particular business segment have been segregated. Cash and cash equivalents, certain other current assets, certain investments and certain other assets have not been allocated to particular business segments and are included in Corporate and Other.
  
Reconciliation of Other Significant Reconciling Items from Segments to Consolidated        
The following table presents Capital Expenditures, including business acquisitions, by business segment: 
 Year Ended December 31,
(in thousands)202120202019
Capital Expenditures
Energy Services and Products
Subsea Robotics$27,591 $14,624 $72,663 
Manufactured Products2,510 1,220 17,522 
OPG7,980 33,647 42,400 
IMDS3,305 3,488 8,529 
Total Energy Services and Products41,386 52,979 141,114 
ADTech2,525 1,462 2,243 
Corporate and Other6,288 6,246 4,327 
Total$50,199 $60,687 $147,684 
  
Segment Reporting Information [Line Items]            
Operating Lease, Right-of-Use Asset       $ 146,097 $ 141,206  
Impairment of Long-Lived Assets Held-for-use $ 68,763     0 70,445 $ 159,353
Impaired Assets to be Disposed of by Method Other than Sale, Amount of Impairment Loss         24,142 44,653
Inventory Write-down       0 7,038 21,285
Goodwill, Impairment Loss     $ 303,005 0 343,880 14,713
Other Adjustments to Income, Discontinued Operations       1,308 21,210 11,751
Total Adjustments To Income From Continuing Operations       32,272 466,715 251,755
Depreciation       136,000 170,000 $ 212,000
Impairment of Intangible Assets, Finite-lived         $ 10,000  
Accounts Receivable, Allowance for Credit Loss, Writeoff       29,549    
Gain (Loss) on Disposition of Property Plant Equipment, Excluding Oil and Gas Property and Timber Property       $ 1,415    
Customer Concentration Risk [Member]            
Segment Reporting Information [Line Items]            
Concentration Risk, Percentage       12.00% 1000.00% 10.00%
Subsea Projects [Member]            
Segment Reporting Information [Line Items]            
Goodwill, Impairment Loss     129,562      
Manufactured Products            
Segment Reporting Information [Line Items]            
Impairment of Long-Lived Assets Held-for-use         $ 61,074  
Impaired Assets to be Disposed of by Method Other than Sale, Amount of Impairment Loss           $ 482
Inventory Write-down           2,107
Goodwill, Impairment Loss   $ 41,000 11,388   52,263 0
Other Adjustments to Income, Discontinued Operations       $ 537 2,266 757
Total Adjustments To Income From Continuing Operations       30,086 115,603 3,346
Accounts Receivable, Allowance for Credit Loss, Writeoff       29,549    
Offshore Projects Group            
Segment Reporting Information [Line Items]            
Impairment of Long-Lived Assets Held-for-use         8,826 142,615
Impaired Assets to be Disposed of by Method Other than Sale, Amount of Impairment Loss         16,644 18,723
Inventory Write-down           2,771
Goodwill, Impairment Loss     66,285   66,285 0
Other Adjustments to Income, Discontinued Operations       149 8,590 3,526
Total Adjustments To Income From Continuing Operations       149 100,345 167,635
Integrity Management & Digital Solutions            
Segment Reporting Information [Line Items]            
Impairment of Long-Lived Assets Held-for-use         545 16,738
Impaired Assets to be Disposed of by Method Other than Sale, Amount of Impairment Loss         170 14,108
Inventory Write-down           719
Goodwill, Impairment Loss     123,214   123,214 14,713
Other Adjustments to Income, Discontinued Operations       217 4,272 3,082
Total Adjustments To Income From Continuing Operations       217 128,201 49,360
Subsea Robotics            
Segment Reporting Information [Line Items]            
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
Goodwill, Impairment Loss     $ 102,118   102,118 0
Other Adjustments to Income, Discontinued Operations       395 5,055 4,228
Total Adjustments To Income From Continuing Operations       395 121,539 31,001
Aerospace and Defense Technologies            
Segment Reporting Information [Line Items]            
Inventory Write-down           255
Other Adjustments to Income, Discontinued Operations       10 572 102
Total Adjustments To Income From Continuing Operations       10 572 357
Unallocated Expenses Member            
Segment Reporting Information [Line Items]            
Other Adjustments to Income, Discontinued Operations       0 455 56
Total Adjustments To Income From Continuing Operations       1,415 $ 455 $ 56
Gain (Loss) on Disposition of Property Plant Equipment, Excluding Oil and Gas Property and Timber Property       $ 1,415