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Restructuring - Schedule of Components of Restructuring Expense in Condensed Consolidated Statements of Income (Detail) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Restructuring Cost And Reserve [Line Items]        
Total restructuring expenses $ 1,400 $ 1,025 $ 3,463 $ 6,975
Selling, General and Administrative Expenses [Member]        
Restructuring Cost And Reserve [Line Items]        
Total restructuring expenses 703 634 1,547 2,400
Research and Development Expenses [Member]        
Restructuring Cost And Reserve [Line Items]        
Total restructuring expenses 647   1,231 1,814
Cost of Sales [Member]        
Restructuring Cost And Reserve [Line Items]        
Total restructuring expenses $ 50 $ 391 $ 685 $ 2,761