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Business Segment, Geographic Area, Product and Significant Customer Information - Additional Information (Detail) - 6 months ended Jun. 30, 2015 | Segment Product Customer
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Segment Reporting [Abstract] |
Number of reportable segments | Segment | 4
Number of product groups | 3
Number of customers with net revenues greater than 10% of total net revenues | Customer | 2

X
- 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

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