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Inventories (Details) - USD ($)
$ in Thousands
3 Months Ended
Jun. 30, 2016
Dec. 31, 2015
Inventory [Line Items]    
Raw materials $ 118,027 $ 134,591
Total inventory 144,876 163,657
Drilling fluids    
Inventory [Line Items]    
Raw materials 116,651 133,934
Mats    
Inventory [Line Items]    
Raw materials 1,376 657
Finished goods 2,579 3,723
Blended drilling fluids components    
Inventory [Line Items]    
Finished goods 24,270 $ 25,343
United States | Fluids systems | Cost of sales    
Inventory [Line Items]    
Inventory write-down $ 600