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Business Segment, Geographic Area, Product and Significant Customer Information - Additional Information (Detail) | 9 Months Ended
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Sep. 30, 2017 Segment Customer Product
Segment Reporting [Abstract] |
Number of reportable segments | Segment | 2
Number of product groups | Product | 7
Number of customers with net revenues greater than 10% of total net revenues | Customer | 2
Entity wide net revenue major customer percentage minimum | 10.00%

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- Definition Entity wide net revenue major customer percentage minimum. + References No definition available. + Details
Name: | mksi_EntityWideRevenueMajorCustomerPercentageMinimum
Namespace Prefix: | mksi_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Number of major customers. + References No definition available. + Details
Name: | mksi_NumberOfMajorCustomers
Namespace Prefix: | mksi_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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- Definition Number of product groups. + References No definition available. + Details
Name: | mksi_NumberOfProductGroups
Namespace Prefix: | mksi_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements. + References No definition available. + Details
Name: | us-gaap_NumberOfReportableSegments
Namespace Prefix: | us-gaap_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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- References No definition available. + Details
Name: | us-gaap_SegmentReportingAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration