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Stock-Based Compensation - Additional Information (Detail) - USD ($)
$ / shares in Units, $ in Thousands
1 Months Ended 9 Months Ended
Apr. 29, 2016
May 31, 2017
May 31, 2016
Sep. 30, 2017
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       $ 25,051
Restricted Stock Units (RSUs) [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Shares issued as per merger agreement       1,260,525
Number of RSUs outstanding       12,233
Dividend reinvestment       286
Restricted stock units, granted       388,137
Restricted stock units, weighted average grant date fair value       $ 67.58
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 36,599      
Newport RSUs converted to MKS RSUs at Merger date and released   5,515 19,137  
Stock Appreciation Rights (SARs) [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Restricted stock units, granted       0
Restricted stock units, weighted average grant date fair value       $ 0
Newport [Member] | Restricted Stock Units (RSUs) [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Shares issued as per merger agreement 360,674      
Newport [Member] | Stock Appreciation Rights (SARs) [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Shares issued as per merger agreement 899,851