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