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Stock-Based Compensation - Additional Information (Detail) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 9 Months Ended
Apr. 29, 2016
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Common stock reserved for issuance   18,000,000   18,000,000  
Total compensation expense related to unvested stock-based awards granted to employees, officers and directors   $ 29,283   $ 29,283  
Stock options and restricted stock units, outstanding     752,000   752,000
Restricted Stock Units (RSUs) [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Anti-dilutive weighted-average restricted stock units excluded from computation of diluted weighted-average shares   529,000   401,000  
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       17,462  
Dividend reinvestment       136  
Restricted stock units, granted       740,985  
Restricted stock units, weighted average grant date fair value       $ 35.51  
Anti-dilutive weighted-average restricted stock units excluded from computation of diluted weighted-average shares     0   0
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       19,137  
Stock Appreciation Rights (SARs) [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Restricted stock units, granted       0  
Anti-dilutive weighted-average restricted stock units excluded from computation of diluted weighted-average shares   213,000   181,000  
Stock Options [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Anti-dilutive weighted-average restricted stock units excluded from computation of diluted weighted-average shares     0   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