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Goodwill and Intangible Assets - Goodwill Associated with Reportable Segments (Detail) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
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Segment Reporting Information [Line Items] |  |  |
Goodwill | $ 192,381 us-gaap_Goodwill | $ 150,909 us-gaap_Goodwill | $ 150,733 us-gaap_Goodwill
Advanced Manufacturing Capital Equipment [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Goodwill | 184,234 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = mksi_AdvanceManufacturingCapitalEquipmentMember | 142,065 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = mksi_AdvanceManufacturingCapitalEquipmentMember |
Analytical Solutions Group [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Goodwill | 8,668 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = mksi_AnalyticalSolutionsGroupMember | 8,668 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = mksi_AnalyticalSolutionsGroupMember |
Foreign Currency Translation [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Goodwill | $ (521)us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = mksi_ForeignCurrencyTranslationMember | $ 176 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = mksi_ForeignCurrencyTranslationMember |

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- Definition Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266 + Details
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- Details
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- Details
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- Details
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