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Revenue by Geographic Area (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Net sales	$ 289,323us-gaap_SalesRevenueNet	$ 225,308us-gaap_SalesRevenueNet	$ 281,370us-gaap_SalesRevenueNet
Taiwan
Net sales	57,244us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = country_TW	47,653us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = country_TW	74,034us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = country_TW
United States
Net sales	26,265us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = country_US	22,528us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = country_US	20,230us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = country_US
Japan
Net sales	11,180us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = country_JP	3,936us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = country_JP	5,363us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = country_JP
Korea
Net sales	150,557us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = country_KR	115,287us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = country_KR	137,797us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = country_KR
China
Net sales	35,008us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = country_CN	29,129us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = country_CN	37,507us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = country_CN
Others
Net sales	$ 9,069us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = simo_OtherCountriesMember	$ 6,775us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = simo_OtherCountriesMember	$ 6,439us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = simo_OtherCountriesMember

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- 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

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