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Intangible Assets Acquired from Acquisition (Detail) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013
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Intangible Assets [Line Items] |  |
Accumulated Impairment | $ (30,808)us-gaap_GoodwillImpairedAccumulatedImpairmentLoss | $ (30,808)us-gaap_GoodwillImpairedAccumulatedImpairmentLoss
FCI and Centronix |  |
Intangible Assets [Line Items] |  |
Cost | 25,377 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_BusinessAcquisitionAxis = simo_AcquiredEntitiesMember | 25,377 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_BusinessAcquisitionAxis = simo_AcquiredEntitiesMember
Accumulated Impairment | (4,474)us-gaap_GoodwillImpairedAccumulatedImpairmentLoss / us-gaap_BusinessAcquisitionAxis = simo_AcquiredEntitiesMember | (4,474)us-gaap_GoodwillImpairedAccumulatedImpairmentLoss / us-gaap_BusinessAcquisitionAxis = simo_AcquiredEntitiesMember
Accumulated Amortization | (20,903)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_BusinessAcquisitionAxis = simo_AcquiredEntitiesMember | (20,903)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_BusinessAcquisitionAxis = simo_AcquiredEntitiesMember
Net Carrying Amount | 0 us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_BusinessAcquisitionAxis = simo_AcquiredEntitiesMember | 0 us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_BusinessAcquisitionAxis = simo_AcquiredEntitiesMember
FCI and Centronix | Core Technology |  |
Intangible Assets [Line Items] |  |
Cost | 15,809 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_BusinessAcquisitionAxis = simo_AcquiredEntitiesMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = simo_CoreTechnologyMember | 15,809 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_BusinessAcquisitionAxis = simo_AcquiredEntitiesMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = simo_CoreTechnologyMember
Accumulated Impairment | (4,474)us-gaap_GoodwillImpairedAccumulatedImpairmentLoss / us-gaap_BusinessAcquisitionAxis = simo_AcquiredEntitiesMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = simo_CoreTechnologyMember | (4,474)us-gaap_GoodwillImpairedAccumulatedImpairmentLoss / us-gaap_BusinessAcquisitionAxis = simo_AcquiredEntitiesMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = simo_CoreTechnologyMember
Accumulated Amortization | (11,335)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_BusinessAcquisitionAxis = simo_AcquiredEntitiesMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = simo_CoreTechnologyMember | (11,335)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_BusinessAcquisitionAxis = simo_AcquiredEntitiesMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = simo_CoreTechnologyMember
Net Carrying Amount | 0 us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_BusinessAcquisitionAxis = simo_AcquiredEntitiesMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = simo_CoreTechnologyMember | 0 us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_BusinessAcquisitionAxis = simo_AcquiredEntitiesMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = simo_CoreTechnologyMember
FCI and Centronix | Customer Relationships |  |
Intangible Assets [Line Items] |  |
Cost | 8,325 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_BusinessAcquisitionAxis = simo_AcquiredEntitiesMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerRelationshipsMember | 8,325 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_BusinessAcquisitionAxis = simo_AcquiredEntitiesMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerRelationshipsMember
Accumulated Amortization | (8,325)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_BusinessAcquisitionAxis = simo_AcquiredEntitiesMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerRelationshipsMember | (8,325)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_BusinessAcquisitionAxis = simo_AcquiredEntitiesMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerRelationshipsMember
Net Carrying Amount | 0 us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_BusinessAcquisitionAxis = simo_AcquiredEntitiesMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerRelationshipsMember | 0 us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_BusinessAcquisitionAxis = simo_AcquiredEntitiesMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerRelationshipsMember
FCI and Centronix | Order backlog |  |
Intangible Assets [Line Items] |  |
Cost | 1,243 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_BusinessAcquisitionAxis = simo_AcquiredEntitiesMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_OrderOrProductionBacklogMember | 1,243 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_BusinessAcquisitionAxis = simo_AcquiredEntitiesMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_OrderOrProductionBacklogMember
Accumulated Amortization | (1,243)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_BusinessAcquisitionAxis = simo_AcquiredEntitiesMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_OrderOrProductionBacklogMember | (1,243)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_BusinessAcquisitionAxis = simo_AcquiredEntitiesMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_OrderOrProductionBacklogMember
Net Carrying Amount | $ 0 us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_BusinessAcquisitionAxis = simo_AcquiredEntitiesMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_OrderOrProductionBacklogMember | $ 0 us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_BusinessAcquisitionAxis = simo_AcquiredEntitiesMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_OrderOrProductionBacklogMember

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- Definition Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 + Details
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- Definition Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 + Details
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- Definition Amount of accumulated impairment loss for 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 -Subparagraph (a,h) -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 + Details
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