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Business Segment, Geographic Area, Product and Significant Customer Information - Goodwill Associated with Reportable Segments (Detail) (USD $) In Thousands, unless otherwise specified | Mar. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
--- | --- | --- | ---
Segment Reporting Information [Line Items] |  |  |
Goodwill | $ 199,330 us-gaap_Goodwill | $ 192,381 us-gaap_Goodwill | $ 150,909 us-gaap_Goodwill
Operating Segments [Member] | Advanced Manufacturing Capital Equipment [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Goodwill | 173,510 us-gaap_Goodwill / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = mksi_AdvanceManufacturingCapitalEquipmentMember | 166,946 us-gaap_Goodwill / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = mksi_AdvanceManufacturingCapitalEquipmentMember |
Operating Segments [Member] | Global Service [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Goodwill | 19,728 us-gaap_Goodwill / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = mksi_GlobalServiceMember | 19,728 us-gaap_Goodwill / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = mksi_GlobalServiceMember |
Operating Segments [Member] | Other [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Goodwill | 6,228 us-gaap_Goodwill / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember | 6,228 us-gaap_Goodwill / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember |
Foreign Currency Translation [Member] | Segment Reconciling Items [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Goodwill | $ (136)us-gaap_Goodwill / us-gaap_ConsolidationItemsAxis = us-gaap_MaterialReconcilingItemsMember / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedTranslationAdjustmentMember | $ (521)us-gaap_Goodwill / us-gaap_ConsolidationItemsAxis = us-gaap_MaterialReconcilingItemsMember / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedTranslationAdjustmentMember |

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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
Name: | us-gaap_Goodwill
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_StatementEquityComponentsAxis=us-gaap_AccumulatedTranslationAdjustmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |