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Summary of Notes and Accounts Receivable (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Accounts and Other Receivables [Line Items]        
Notes receivable $ 192us-gaap_NotesAndLoansReceivableGrossCurrent $ 251us-gaap_NotesAndLoansReceivableGrossCurrent    
Trade accounts receivable 31,256simo_TradeAccountsReceivableGross 33,296simo_TradeAccountsReceivableGross    
Trade Accounts And Notes Receivable Gross Current 31,448simo_TradeAccountsAndNotesReceivableGrossCurrent 33,547simo_TradeAccountsAndNotesReceivableGrossCurrent    
Allowance for doubtful accounts (1,167)us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent (1,275)us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent (1,634)us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent (2,648)us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent
Allowance for sales returns and discounts (1,427)simo_AllowanceForSalesReturnsAndDiscounts (1,059)simo_AllowanceForSalesReturnsAndDiscounts (1,919)simo_AllowanceForSalesReturnsAndDiscounts (2,709)simo_AllowanceForSalesReturnsAndDiscounts
Notes and accounts receivable, net $ 28,854us-gaap_AccountsNotesAndLoansReceivableNetCurrent $ 31,213us-gaap_AccountsNotesAndLoansReceivableNetCurrent