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v3.19.1

Business Segment, Geographic Area, Product and Significant Customer Information - Additional Information (Detail) | 3 Months Ended | 12 Months Ended
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Mar. 31, 2019 Segment | Dec. 31, 2018 Product
Segment Reporting [Abstract] |  |
Number of reportable segments | Segment | 2 |
Number of product groups | Product |  | 3

X
- 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

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