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Property, Plant and Equipment (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Dec. 31, 2017
Sep. 30, 2017
Property, Plant and Equipment [Line Items]        
Property, plant and equipment, gross $ 1,234,758   $ 1,231,579  
Less: Accumulated depreciation (785,605)   (761,933)  
Total property, plant and equipment, net 449,153   469,646  
Proceeds from sale of assets 1,639 $ 1,636    
Land        
Property, Plant and Equipment [Line Items]        
Property, plant and equipment, gross 15,365   15,314  
Land improvements        
Property, Plant and Equipment [Line Items]        
Property, plant and equipment, gross $ 15,080   14,594  
Land improvements | Minimum        
Property, Plant and Equipment [Line Items]        
Estimated useful lives 8 years      
Land improvements | Maximum        
Property, Plant and Equipment [Line Items]        
Estimated useful lives 15 years      
Buildings and improvements        
Property, Plant and Equipment [Line Items]        
Estimated useful lives 39 years      
Property, plant and equipment, gross $ 117,003   119,380  
Buildings and improvements | Middle East region        
Property, Plant and Equipment [Line Items]        
Reclassification of property, plant and equipment to assets held for sale       $ 4,100
Proceeds from sale of assets $ 800      
Rental machinery and equipment        
Property, Plant and Equipment [Line Items]        
Estimated useful lives 7 years      
Property, plant and equipment, gross $ 900,702   898,146  
Machinery and equipment - other        
Property, Plant and Equipment [Line Items]        
Estimated useful lives 7 years      
Property, plant and equipment, gross $ 55,351   55,049  
Furniture, fixtures and computers        
Property, Plant and Equipment [Line Items]        
Estimated useful lives 5 years      
Property, plant and equipment, gross $ 27,697   27,259  
Automobiles and other vehicles        
Property, Plant and Equipment [Line Items]        
Estimated useful lives 5 years      
Property, plant and equipment, gross $ 30,001   29,971  
Leasehold improvements        
Property, Plant and Equipment [Line Items]        
Property, plant and equipment, gross $ 11,915   10,030  
Leasehold improvements | Minimum        
Property, Plant and Equipment [Line Items]        
Estimated useful lives 7 years      
Leasehold improvements | Maximum        
Property, Plant and Equipment [Line Items]        
Estimated useful lives 15 years      
Construction in progress - machinery and equipment and land improvements        
Property, Plant and Equipment [Line Items]        
Property, plant and equipment, gross $ 61,644   $ 61,836