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Change in Allowances (Detail) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Allowances for doubtful accounts      
Balance, beginning of year $ 1,275us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent $ 1,634us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent $ 2,648us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent
Additions (reversals) charged to expense, net (108)us-gaap_AllowanceForDoubtfulAccountsReceivablePeriodIncreaseDecrease (359)us-gaap_AllowanceForDoubtfulAccountsReceivablePeriodIncreaseDecrease (663)us-gaap_AllowanceForDoubtfulAccountsReceivablePeriodIncreaseDecrease
Write-offs     (351)us-gaap_AllowanceForDoubtfulAccountsReceivableWriteOffs
Balance, end of year 1,167us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent 1,275us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent 1,634us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent
Allowances for sales returns and discounts      
Balance, beginning of year 1,059simo_AllowanceForSalesReturnsAndDiscounts 1,919simo_AllowanceForSalesReturnsAndDiscounts 2,709simo_AllowanceForSalesReturnsAndDiscounts
Additions 1,600simo_AllowancesForSalesReturnsAndDiscountsAdditions 1,320simo_AllowancesForSalesReturnsAndDiscountsAdditions 297simo_AllowancesForSalesReturnsAndDiscountsAdditions
Write-offs (1,232)simo_AllowanceForSalesReturnsAndDiscountsWriteOffs (2,180)simo_AllowanceForSalesReturnsAndDiscountsWriteOffs (1,087)simo_AllowanceForSalesReturnsAndDiscountsWriteOffs
Balance, end of year $ 1,427simo_AllowanceForSalesReturnsAndDiscounts $ 1,059simo_AllowanceForSalesReturnsAndDiscounts $ 1,919simo_AllowanceForSalesReturnsAndDiscounts