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Business Segment, Geographic Area, Product and Significant Customer Information - Net Revenues by Reportable Segment (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
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total net revenues | $ 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
Operating Segments [Member] | Advanced Manufacturing Capital Equipment [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total net revenues |  |  |  |  |  |  |  |  | 639,623 us-gaap_SalesRevenueNet / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = mksi_AdvanceManufacturingCapitalEquipmentMember | 526,027 us-gaap_SalesRevenueNet / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = mksi_AdvanceManufacturingCapitalEquipmentMember | 479,751 us-gaap_SalesRevenueNet / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = mksi_AdvanceManufacturingCapitalEquipmentMember
Operating Segments [Member] | Analytical Solutions Group [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total net revenues |  |  |  |  |  |  |  |  | 61,161 us-gaap_SalesRevenueNet / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = mksi_AnalyticalSolutionsGroupMember | 56,324 us-gaap_SalesRevenueNet / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = mksi_AnalyticalSolutionsGroupMember | 62,765 us-gaap_SalesRevenueNet / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = mksi_AnalyticalSolutionsGroupMember
Operating Segments [Member] | Europe Region Sales & Service [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total net revenues |  |  |  |  |  |  |  |  | 55,115 us-gaap_SalesRevenueNet / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = mksi_EuropeSalesAndServiceOperationsMember | 48,518 us-gaap_SalesRevenueNet / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = mksi_EuropeSalesAndServiceOperationsMember | 51,440 us-gaap_SalesRevenueNet / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = mksi_EuropeSalesAndServiceOperationsMember
Operating Segments [Member] | Asia Region Sales & Service Operations [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total net revenues |  |  |  |  |  |  |  |  | 240,772 us-gaap_SalesRevenueNet / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = mksi_AsiaSalesAndServiceOperationsMember | 218,048 us-gaap_SalesRevenueNet / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = mksi_AsiaSalesAndServiceOperationsMember | 229,731 us-gaap_SalesRevenueNet / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = mksi_AsiaSalesAndServiceOperationsMember
Corporate, Eliminations and Other [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total net revenues |  |  |  |  |  |  |  |  | $ (215,802)us-gaap_SalesRevenueNet / us-gaap_ConsolidationItemsAxis = mksi_CorporateEliminationsAndOtherMember | $ (179,497)us-gaap_SalesRevenueNet / us-gaap_ConsolidationItemsAxis = mksi_CorporateEliminationsAndOtherMember | $ (180,179)us-gaap_SalesRevenueNet / us-gaap_ConsolidationItemsAxis = mksi_CorporateEliminationsAndOtherMember

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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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