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Revenue by Product Category (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Segment Reporting Information [Line Items]
Net sales	$ 289,323us-gaap_SalesRevenueNet	$ 225,308us-gaap_SalesRevenueNet	$ 281,370us-gaap_SalesRevenueNet
Mobile Storage
Segment Reporting Information [Line Items]
Net sales	241,614us-gaap_SalesRevenueNet / us-gaap_ProductOrServiceAxis = simo_ProductOneMember	185,488us-gaap_SalesRevenueNet / us-gaap_ProductOrServiceAxis = simo_ProductOneMember	202,093us-gaap_SalesRevenueNet / us-gaap_ProductOrServiceAxis = simo_ProductOneMember
Mobile Communications
Segment Reporting Information [Line Items]
Net sales	40,034us-gaap_SalesRevenueNet / us-gaap_ProductOrServiceAxis = simo_ProductTwoMember	31,022us-gaap_SalesRevenueNet / us-gaap_ProductOrServiceAxis = simo_ProductTwoMember	67,564us-gaap_SalesRevenueNet / us-gaap_ProductOrServiceAxis = simo_ProductTwoMember
Other products
Segment Reporting Information [Line Items]
Net sales	$ 7,675us-gaap_SalesRevenueNet / us-gaap_ProductOrServiceAxis = simo_OtherProductsMember	$ 8,798us-gaap_SalesRevenueNet / us-gaap_ProductOrServiceAxis = simo_OtherProductsMember	$ 11,713us-gaap_SalesRevenueNet / us-gaap_ProductOrServiceAxis = simo_OtherProductsMember

X

- Definition

Total revenue from sale of goods and services rendered during the reporting period, in the normal course of business, reduced by sales returns and allowances, and sales discounts.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 225

-SubTopic 10

-Section S99

-Paragraph 2

-Subparagraph (SX 210.5-03.1)

-URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 1

-Article 5

+ Details

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