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Organization and Operations - Additional Information (Detail)	12 Months Ended
	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: