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Document and Entity Information
 12 Months Ended
Dec. 31, 2014
Document Information [Line Items]  
Document Type 20-F
Amendment Flag false
Document Period End Date Dec. 31, 2014
Document Fiscal Year Focus 2014
Document Fiscal Period Focus FY
Trading Symbol SIMO
Entity Registrant Name SILICON MOTION TECHNOLOGY CORP
Entity Central Index Key 0001329394
Current Fiscal Year End Date --12-31
Entity Well-known Seasoned Issuer No
Entity Current Reporting Status Yes
Entity Voluntary Filers No
Entity Filer Category Accelerated Filer
Entity Common Stock, Shares Outstanding 135,622,076dei_EntityCommonStockSharesOutstanding