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Property, Plant and Equipment - Additional Information (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
Mar. 31, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Jun. 30, 2018
Property, Plant and Equipment [Line Items]            
Proceeds from sale of assets       $ 4,419 $ 10,690  
International Services            
Property, Plant and Equipment [Line Items]            
Impairment of Long-Lived Assets Held-for-use     $ 300      
International Services | Buildings and improvements            
Property, Plant and Equipment [Line Items]            
Reclassification of property, plant and equipment to assets held for sale $ 300   $ 4,100 300 $ 4,100 $ 4,500
Proceeds from sale of assets 2,600 $ 800        
Reclassification of property, plant and equipment to assets held for sale $ 5,000     $ 5,000