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Related Parties - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Nov. 30, 2017
Related Party Transaction [Line Items]          
Revenue from related parties $ 1.0 $ 3.8 $ 3.0 $ 7.6  
Subsidiary Of Fugro N.V. (AMS:FUR)          
Related Party Transaction [Line Items]          
Ownership percent         23.60%
Revenue from related parties     0.8 0.0  
Expenses for services 3.1 3.0 5.3 4.1  
GMH          
Related Party Transaction [Line Items]          
Management fees paid 0.2 0.2 0.3 0.4  
Affiliated Entity | Harbinger Capital Partners          
Related Party Transaction [Line Items]          
Expenses under service agreement 1.0 $ 1.0 1.9 $ 1.9  
Affiliated Entity | Triple Ring          
Related Party Transaction [Line Items]          
Expenses under service agreement $ 0.7   $ 0.8