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Business Segment, Geographic Area, Product and Significant Customer Information - Worldwide Net Revenue for Each Group of Products (Detail) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 12 Months Ended
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Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Revenue from External Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales from product groups | $ 203,021 us-gaap_SalesRevenueNet | $ 186,798 us-gaap_SalesRevenueNet | $ 184,697 us-gaap_SalesRevenueNet | $ 206,353 us-gaap_SalesRevenueNet | $ 204,394 us-gaap_SalesRevenueNet | $ 166,453 us-gaap_SalesRevenueNet | $ 156,928 us-gaap_SalesRevenueNet | $ 141,645 us-gaap_SalesRevenueNet | $ 780,869 us-gaap_SalesRevenueNet | $ 669,420 us-gaap_SalesRevenueNet | $ 643,508 us-gaap_SalesRevenueNet
Instruments, Control and Vacuum Products [Member] |  |  |  |  |  |  |  |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales from product groups |  |  |  |  |  |  |  |  | 383,863 us-gaap_SalesRevenueNet / us-gaap_ProductOrServiceAxis = mksi_InstrumentsControlAndVacuumProductsMember | 341,375 us-gaap_SalesRevenueNet / us-gaap_ProductOrServiceAxis = mksi_InstrumentsControlAndVacuumProductsMember | 324,939 us-gaap_SalesRevenueNet / us-gaap_ProductOrServiceAxis = mksi_InstrumentsControlAndVacuumProductsMember
Power and Reactive Gas Products [Member] |  |  |  |  |  |  |  |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales from product groups |  |  |  |  |  |  |  |  | 335,271 us-gaap_SalesRevenueNet / us-gaap_ProductOrServiceAxis = mksi_PowerAndReactiveGasProductsMember | 273,357 us-gaap_SalesRevenueNet / us-gaap_ProductOrServiceAxis = mksi_PowerAndReactiveGasProductsMember | 251,669 us-gaap_SalesRevenueNet / us-gaap_ProductOrServiceAxis = mksi_PowerAndReactiveGasProductsMember
Analytical Solutions Group Products [Member] |  |  |  |  |  |  |  |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales from product groups |  |  |  |  |  |  |  |  | $ 61,735 us-gaap_SalesRevenueNet / us-gaap_ProductOrServiceAxis = mksi_AnalyticalSolutionsGroupProductsMember | $ 54,688 us-gaap_SalesRevenueNet / us-gaap_ProductOrServiceAxis = mksi_AnalyticalSolutionsGroupProductsMember | $ 66,900 us-gaap_SalesRevenueNet / us-gaap_ProductOrServiceAxis = mksi_AnalyticalSolutionsGroupProductsMember

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- Definition Total revenue from sale of goods and services rendered during the reporting period, in the normal course of business, reduced by sales returns and allowances, and sales discounts. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 1 -Article 5 + Details
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