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Intangible Assets, Goodwill and Other (Details)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2021
USD ($)
Sep. 30, 2020
USD ($)
Mar. 31, 2020
USD ($)
units
Dec. 31, 2019
USD ($)
Dec. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
units
Dec. 31, 2019
USD ($)
Goodwill [Line Items]              
Goodwill, Impairment Loss     $ 303,005   $ 0 $ 343,880 $ 14,713
Goodwill Impairment Loss Allocation Table [Table] The following table reflects goodwill impairments as recorded in the three-month period ended March 31, 2020, and allocated, based on historical cost, to our new reporting segments:
Three Months Ended March 31, 2020
(in thousands)As originally recordedAs recast to reflect segment changes
Segment/Reporting UnitGoodwill ImpairmentSubsea Robotics Manufactured ProductsOPGIMDSTotal
Subsea Products/ST&R$51,302 $17,457 $— $33,845 $— $51,302 
Subsea Projects/Subsea Projects129,562 84,661 — 32,440 12,461 129,562 
Asset Integrity/Asset Integrity110,753 — — — 110,753 110,753 
Advanced Technologies/Commercial11,388 — 11,388 — — 11,388 
Total goodwill impairment$303,005 $102,118 $11,388 $66,285 $123,214 $303,005 
            
Property, Plant and Equipment [Line Items]              
Impairment of Long-Lived Assets Held-for-use $ 68,763       $ 0 70,445 159,353
Asset Impairment Charges       $ 45,000   $ 24,000  
Measurement Input, Long-term Revenue Growth Rate [Member]              
Goodwill [Line Items]              
Alternative Investment, Measurement Input | units     2     0.02  
Maximum [Member]              
Goodwill [Line Items]              
Alternative Investment, Measurement Input | units     15     0.15  
Minimum [Member]              
Goodwill [Line Items]              
Alternative Investment, Measurement Input | units     12     0.11  
Subsea Products [Member]              
Goodwill [Line Items]              
Goodwill, Impairment Loss     $ 51,302        
Subsea Projects [Member]              
Goodwill [Line Items]              
Goodwill, Impairment Loss     129,562        
Asset Integrity [Member]              
Goodwill [Line Items]              
Goodwill, Impairment Loss     110,753       15,000
Advanced Technologies [Member]              
Goodwill [Line Items]              
Goodwill, Impairment Loss     11,388        
Subsea Robotics              
Goodwill [Line Items]              
Goodwill, Impairment Loss     102,118     $ 102,118 0
Manufactured Products              
Goodwill [Line Items]              
Goodwill, Impairment Loss   $ 41,000 11,388     52,263 0
Property, Plant and Equipment [Line Items]              
Impairment of Long-Lived Assets Held-for-use           61,074  
Offshore Projects Group              
Goodwill [Line Items]              
Goodwill, Impairment Loss     66,285     66,285 0
Property, Plant and Equipment [Line Items]              
Impairment of Long-Lived Assets Held-for-use           8,826 142,615
Integrity Management & Digital Solutions              
Goodwill [Line Items]              
Goodwill, Impairment Loss     123,214     123,214 14,713
Property, Plant and Equipment [Line Items]              
Impairment of Long-Lived Assets Held-for-use           $ 545 16,738
SDS Rosyth              
Property, Plant and Equipment [Line Items]              
Impairment of Long-Lived Assets Held-for-use     6,543        
SDS Brazil              
Property, Plant and Equipment [Line Items]              
Impairment of Long-Lived Assets Held-for-use     9,834        
Subsea Products Angola Member [Member]              
Property, Plant and Equipment [Line Items]              
Impairment of Long-Lived Assets Held-for-use     38,482        
Shallow Water Member              
Property, Plant and Equipment [Line Items]              
Impairment of Long-Lived Assets Held-for-use     3,894        
Ecosse [Member]              
Property, Plant and Equipment [Line Items]              
Impairment of Long-Lived Assets Held-for-use     3,628       10,721
Global Data Solution Member              
Property, Plant and Equipment [Line Items]              
Impairment of Long-Lived Assets Held-for-use     167        
Oceaneering Entertainment System              
Property, Plant and Equipment [Line Items]              
Impairment of Long-Lived Assets Held-for-use     5,065        
Oceaneering AGV System Member              
Property, Plant and Equipment [Line Items]              
Impairment of Long-Lived Assets Held-for-use     $ 1,150        
Manufactured Products              
Property, Plant and Equipment [Line Items]              
Impairment of Long-Lived Assets Held-for-use 61,074            
Offshore Projects Group              
Property, Plant and Equipment [Line Items]              
Impairment of Long-Lived Assets Held-for-use 7,522           142,615
Integrity Management & Digital Solutions              
Property, Plant and Equipment [Line Items]              
Impairment of Long-Lived Assets Held-for-use $ 167           16,738
Deepwater and Shallow Water [Member]              
Property, Plant and Equipment [Line Items]              
Impairment of Long-Lived Assets Held-for-use             131,894
Asset Integrity [Member]              
Property, Plant and Equipment [Line Items]              
Impairment of Long-Lived Assets Held-for-use             $ 16,738