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Restructuring - Additional Information (Detail) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Restructuring Cost and Reserve [Line Items]        
Restructuring liability, current $ 837 $ 964 $ 837  
Restructuring liability, long-term   500    
Impairment of abandoned product line, net of recoveries $ 11,500 (269) $ 11,540 $ 0
2015 Initiatives        
Restructuring Cost and Reserve [Line Items]        
Expected costs   6,000    
2017 Initiatives        
Restructuring Cost and Reserve [Line Items]        
Expected costs   $ 4,300