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Restructuring - Schedule of Components of Restructuring Expense in Condensed Consolidated Statements of Income (Detail) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Restructuring Cost And Reserve [Line Items]        
Total restructuring expenses $ 1,195 $ 261 $ 4,658 $ 7,236
Selling, General and Administrative Expenses [Member]        
Restructuring Cost And Reserve [Line Items]        
Total restructuring expenses 531 $ 261 2,078 2,661
Research and Development Expenses [Member]        
Restructuring Cost And Reserve [Line Items]        
Total restructuring expenses 602   1,833 1,814
Cost of Sales [Member]        
Restructuring Cost And Reserve [Line Items]        
Total restructuring expenses $ 62   $ 747 $ 2,761