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Organization and Operations - Additional Information (Detail) | 12 Months Ended
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Dec. 31, 2016
Minimum |
Organization And Operations [Line Items] |
Number of product shipped annually | 750,000,000

X
- Definition Number of product shipped annually. + References No definition available. + Details
Name: | simo_NumberOfProductShippedAnnually
Namespace Prefix: | simo_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Organization And Operations [Line Items] + References No definition available. + Details
Name: | simo_OrganizationAndOperationsLineItems
Namespace Prefix: | simo_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_RangeAxis=us-gaap_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |