Business Segment, Geographic Area, Product and Significant Customer Information - Additional Information (Detail)	3 Months Ended
Mar. 31, 2015 Customer Segment Product
Segment Reporting [Abstract]
Number of reportable segments	4us-gaap_NumberOfReportableSegments
Number of product groups	3mksi_NumberOfProductGroups
Number of customers with net revenues greater than 10% of total net revenues	2mksi_NumberOfMajorCustomers
Entity wide net revenue major customer percentage minimum	10.00%

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.

No definition available.

Name:	us-gaap_NumberOfReportableSegments
Namespace Prefix:	us-gaap_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration