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Property And Equipment - Additional Information (Detail) $ in Thousands | 12 Months Ended
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Dec. 31, 2016 USD ($)
Operating Leased Assets [Line Items] |
Operating leased renewal period of land and buildings | 3 years
Net carrying value lease asset | $ 728
Annual lease and rental income | $ 41

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- Definition Operating Lease Renewal Period + References No definition available. + Details
Name: | simo_OperatingLeaseRenewalPeriod
Namespace Prefix: | simo_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Definition Operating Leased Assets, Net + References No definition available. + Details
Name: | simo_OperatingLeasedAssetsNet
Namespace Prefix: | simo_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Operating Leases, Income Statement, Annual Revenue + References No definition available. + Details
Name: | simo_OperatingLeasesIncomeStatementAnnualRevenue
Namespace Prefix: | simo_
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_OperatingLeasedAssetsLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration