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Property And Equipment - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014
Operating Leased Assets [Line Items]
Operating leased renewal period of land and buildings	3 years
Annual lease and rental income	$ 41simo_OperatingLeasesIncomeStatementAnnualRevenue
Land
Operating Leased Assets [Line Items]
Net carrying value lease asset	603simo_OperatingLeasedAssetsNet / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_LandMember
Buildings
Operating Leased Assets [Line Items]
Net carrying value lease asset	$ 161simo_OperatingLeasedAssetsNet / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_BuildingMember

X

- 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

X

- 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

X

- 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

X

- Details

Name:	us-gaap_OperatingLeasedAssetsLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	us-gaap_PropertyPlantAndEquipmentByTypeAxis=us-gaap_BuildingMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_PropertyPlantAndEquipmentByTypeAxis=us-gaap_LandMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: