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Short-Term Bank Loans (Detail) $ in Thousands | Dec. 31, 2016 USD ($)
--- | ---
Short-term Debt [Line Items] |
Bank loan | $ 25,000
Secured Loans |
Short-term Debt [Line Items] |
Bank loan | $ 25,000

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- Definition Amounts due on short-term bank loans secured by customers' securities on the balance sheet date. + References No definition available. + Details
Name: | us-gaap_BankLoans
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_ShortTermDebtLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_DebtInstrumentAxis=simo_SecuredLoansMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |