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Acquisitions - Summary of Estimated Fair Value of Assets Acquired and Liabilities Assumed (Detail) (USD $)
In Thousands, unless otherwise specified
12 Months Ended 0 Months Ended 1 Months Ended 0 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Mar. 12, 2013
Jun. 30, 2013
Aug. 29, 2012
Jun. 30, 2014
May 30, 2014
Business Acquisition [Line Items]                
Goodwill $ 192,381us-gaap_Goodwill $ 150,909us-gaap_Goodwill $ 150,733us-gaap_Goodwill          
Total purchase price, net of cash acquired 86,950us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired 2,326us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired 22,607us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired          
Granville-Phillips [Member]                
Business Acquisition [Line Items]                
Inventory               6,223us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedInventory
/ us-gaap_BusinessAcquisitionAxis
= mksi_GranvillePhillipsMember
Property and equipment               299us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment
/ us-gaap_BusinessAcquisitionAxis
= mksi_GranvillePhillipsMember
Intangible assets               38,850us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles
/ us-gaap_BusinessAcquisitionAxis
= mksi_GranvillePhillipsMember
Goodwill             41,612us-gaap_Goodwill
/ us-gaap_BusinessAcquisitionAxis
= mksi_GranvillePhillipsMember
41,612us-gaap_Goodwill
/ us-gaap_BusinessAcquisitionAxis
= mksi_GranvillePhillipsMember
Other assets               191us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOtherNoncurrentAssets
/ us-gaap_BusinessAcquisitionAxis
= mksi_GranvillePhillipsMember
Warranty liability               (175)mksi_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedWarrantLiability
/ us-gaap_BusinessAcquisitionAxis
= mksi_GranvillePhillipsMember
Total purchase price               87,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet
/ us-gaap_BusinessAcquisitionAxis
= mksi_GranvillePhillipsMember
Alter S.r.l [Member]                
Business Acquisition [Line Items]                
Current assets       1,053us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssets
/ us-gaap_BusinessAcquisitionAxis
= mksi_AlterMember
       
Property and equipment       211us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment
/ us-gaap_BusinessAcquisitionAxis
= mksi_AlterMember
       
Intangible assets       2,806us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles
/ us-gaap_BusinessAcquisitionAxis
= mksi_AlterMember
       
Goodwill       381us-gaap_Goodwill
/ us-gaap_BusinessAcquisitionAxis
= mksi_AlterMember
       
Other assets       67us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOtherNoncurrentAssets
/ us-gaap_BusinessAcquisitionAxis
= mksi_AlterMember
       
Total assets acquired       4,518us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssets
/ us-gaap_BusinessAcquisitionAxis
= mksi_AlterMember
       
Debt (Note 15)       770us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesLongTermDebt
/ us-gaap_BusinessAcquisitionAxis
= mksi_AlterMember
       
Deferred taxes and other liabilities       1,301mksi_BusinessAcquisitionPurchasePriceAllocationDeferredIncomeTaxesAndOtherLiability
/ us-gaap_BusinessAcquisitionAxis
= mksi_AlterMember
       
Total liabilities assumed       2,071us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilities
/ us-gaap_BusinessAcquisitionAxis
= mksi_AlterMember
       
Total purchase price       2,447us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet
/ us-gaap_BusinessAcquisitionAxis
= mksi_AlterMember
       
Cash acquired       (21)us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCashAndEquivalents
/ us-gaap_BusinessAcquisitionAxis
= mksi_AlterMember
       
Total purchase price, net of cash acquired       2,426us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired
/ us-gaap_BusinessAcquisitionAxis
= mksi_AlterMember
2,058us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired
/ us-gaap_BusinessAcquisitionAxis
= mksi_AlterMember
     
Plasmart, Inc. [Member]                
Business Acquisition [Line Items]                
Current assets           5,536us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssets
/ us-gaap_BusinessAcquisitionAxis
= mksi_PlasmartIncMember
   
Property and equipment           3,565us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment
/ us-gaap_BusinessAcquisitionAxis
= mksi_PlasmartIncMember
   
Intangible assets           10,745us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles
/ us-gaap_BusinessAcquisitionAxis
= mksi_PlasmartIncMember
   
Goodwill           9,989us-gaap_Goodwill
/ us-gaap_BusinessAcquisitionAxis
= mksi_PlasmartIncMember
   
Other assets           554us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOtherNoncurrentAssets
/ us-gaap_BusinessAcquisitionAxis
= mksi_PlasmartIncMember
   
Total assets acquired           30,389us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssets
/ us-gaap_BusinessAcquisitionAxis
= mksi_PlasmartIncMember
   
Debt (Note 15)           4,561us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesLongTermDebt
/ us-gaap_BusinessAcquisitionAxis
= mksi_PlasmartIncMember
   
Deferred taxes and other liabilities           3,128mksi_BusinessAcquisitionPurchasePriceAllocationDeferredIncomeTaxesAndOtherLiability
/ us-gaap_BusinessAcquisitionAxis
= mksi_PlasmartIncMember
   
Total liabilities assumed           7,689us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilities
/ us-gaap_BusinessAcquisitionAxis
= mksi_PlasmartIncMember
   
Total purchase price           22,700us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet
/ us-gaap_BusinessAcquisitionAxis
= mksi_PlasmartIncMember
   
Cash acquired           (93)us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCashAndEquivalents
/ us-gaap_BusinessAcquisitionAxis
= mksi_PlasmartIncMember
   
Total purchase price, net of cash acquired           $ 22,607us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired
/ us-gaap_BusinessAcquisitionAxis
= mksi_PlasmartIncMember