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Stock-Based Compensation - Additional Information (Detail) - USD ($)
9 Months Ended
Apr. 29, 2016
Sep. 30, 2019
Sep. 30, 2018
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   $ 30,795  
Restricted Stock Units (RSUs) [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Restricted stock units, granted   417,335 260,341
Restricted stock units, weighted average grant date fair value   $ 86.18 $ 112.49
Restricted Stock Units (RSUs) [Member] | Newport Deferred Compensation [Member] | Outside Directors [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Newport RSUs converted to MKS RSUs at Merger date   326,283  
Stock Appreciation Rights (SARs) [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Restricted stock units, granted   0 0
Newport [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Shares issued as per merger agreement   748,920  
Newport [Member] | Restricted Stock Units (RSUs) [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Shares issued as per merger agreement 736,133    
Newport [Member] | Stock Appreciation Rights (SARs) [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Shares issued as per merger agreement 12,787