XML 57 R72.htm IDEA: XBRL DOCUMENT v2.4.1.9

Summary of Major Jurisdictions and Tax Year Subject to Examination Tax Authorities (Detail)	12 Months Ended
	Dec. 31, 2014
Taiwan
Income Tax Examination [Line Items]
Years Subject to Income Tax Examination	2009 and onward
FCI
Income Tax Examination [Line Items]
Years Subject to Income Tax Examination	2009 and onward
United States
Income Tax Examination [Line Items]
Years Subject to Income Tax Examination	2007 onward

X

- Definition

Income Tax Examination, Years Subject to Examination

+ References

No definition available.

+ Details

Name:	simo_IncomeTaxExaminationYearsSubjectToExamination
Namespace Prefix:	simo_
Data Type:	us-types:durationStringItemType
Balance Type:	na
Period Type:	duration

X

- Details

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

X

- Details

Name:	simo_LocationAxis=country_US
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	simo_LocationAxis=simo_FciIncMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	simo_LocationAxis=simo_TaiwanMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: