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Stock-Based Compensation - Additional Information (Detail) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 6 Months Ended
Apr. 29, 2016
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 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   $ 33,207   $ 33,207  
Stock options and restricted stock units, outstanding     772,000   772,000
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   1,000   1,000  
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  
Restricted stock units, granted       695,284  
Restricted stock units, weighted average grant date fair value       $ 35.17  
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  
Newport RSUs converted to MKS RSUs at Merger date remaining to issue       17,462  
Stock Appreciation Rights (SARs) [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Restricted stock units, granted       0  
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