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Corporate Restructuring and Other Organizational Changes - Additional Information (Detail) - Facility Closures [Member] - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Restructuring Cost and Reserve [Line Items]    
Restructuring charges $ 4,555 $ 5,945
Other Current Liabilities [Member]    
Restructuring Cost and Reserve [Line Items]    
Restructuring charges 1,600  
Other Noncurrent Liabilities [Member]    
Restructuring Cost and Reserve [Line Items]    
Restructuring charges $ 3,000