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Segment Information & Geographic Data - Net Sales to Significant Customers as a Percent of Total Net Sales (Detail) - Customer Concentration Risk
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Customer A | Sales Revenue, Net      
Revenue, Major Customer [Line Items]      
Concentration risk percentage 17.70% 18.30% 20.30%
Customer A | Accounts Receivable      
Revenue, Major Customer [Line Items]      
Concentration risk percentage 13.60% 16.80%  
Customer B | Sales Revenue, Net      
Revenue, Major Customer [Line Items]      
Concentration risk percentage 13.90% 13.70% 15.70%
Customer B | Accounts Receivable      
Revenue, Major Customer [Line Items]      
Concentration risk percentage 6.70% 7.80%  
Customer C | Sales Revenue, Net      
Revenue, Major Customer [Line Items]      
Concentration risk percentage 20.70% 16.60% 14.10%
Customer C | Accounts Receivable      
Revenue, Major Customer [Line Items]      
Concentration risk percentage 20.40% 20.60%  
AIT | Customer A | Sales Revenue, Net      
Revenue, Major Customer [Line Items]      
Concentration risk percentage 4.80% 5.30% 6.20%
AIT | Customer B | Sales Revenue, Net      
Revenue, Major Customer [Line Items]      
Concentration risk percentage 4.90% 4.70% 5.60%
AIT | Customer C | Sales Revenue, Net      
Revenue, Major Customer [Line Items]      
Concentration risk percentage 6.50% 6.10% 6.20%
EVM | Customer A | Sales Revenue, Net      
Revenue, Major Customer [Line Items]      
Concentration risk percentage 12.90% 13.00% 14.10%
EVM | Customer B | Sales Revenue, Net      
Revenue, Major Customer [Line Items]      
Concentration risk percentage 9.00% 9.00% 10.10%
EVM | Customer C | Sales Revenue, Net      
Revenue, Major Customer [Line Items]      
Concentration risk percentage 14.20% 10.50% 7.90%