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Acquisitions, Dispositions, and Deconsolidations - Marine Services Segment (Details) - Marine Services
$ in Millions
Nov. 30, 2017
USD ($)
employee
asset
Dec. 31, 2017
USD ($)
Subsidiary Of Fugro N.V. (AMS:FUR)    
Business Acquisition [Line Items]    
Number of assets acquired | asset 5  
Number of employees acquired | employee 19  
Consideration paid $ 87.2  
Short-term loan $ 7.5  
CWind Limited    
Business Acquisition [Line Items]    
Acquisition costs   $ 1.8
GMH LLC | Subsidiary Of Fugro N.V. (AMS:FUR)    
Business Acquisition [Line Items]    
Percentage of ownership 23.60%