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Stock-Based Compensation - Additional Information (Detail) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Common stock reserved for issuance 18,000,000  
Total compensation expense related to unvested stock-based awards granted to employees, officers and directors $ 27.9  
Restricted Stock Units (RSUs) [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Shares issued as per merger agreement 749,000  
Restricted stock units, granted 88,368 182,000
Restricted stock units, weighted average grant date fair value $ 112.24 $ 82.58
Restricted Stock Units (RSUs) [Member] | ESI Plan member [Member] | Outside Directors [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Newport RSUs converted to MKS RSUs at Merger date 326,000  
Stock Appreciation Rights (SARs) [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Restricted stock units, granted 0 0
Newport Corporation | Restricted Stock Units (RSUs) [Member] | ESI Plan member [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Shares issued as per merger agreement 736,000  
Newport Corporation | Stock Appreciation Rights (SARs) [Member] | ESI Plan member [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Shares issued as per merger agreement 13,000