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Equity Incentive Plan - Additional Information (Detail) (USD $) In Thousands, except Share data, unless otherwise specified | 1 Months Ended | 12 Months Ended |  |
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Apr. 30, 2010 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2009 | Dec. 31, 2006 | Dec. 31, 2004 | Dec. 31, 2011 | Apr. 22, 2005
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Number of option outstanding |  | 1,058,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber | 1,410,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber | 1,697,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber |  |  |  | 1,849,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber |
Number of option exercisable |  | 1,058,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber |  |  |  |  |  |  |
Stock option exchange for new stock option granted | 4,369,000 simo_StockOptionsSubjectToAndExchangedInOptionExchangeProgram |  |  |  |  |  |  |  |
Stock options exercise price | $ 1.47 simo_OptionsExchangedUnderOptionExchangeProgramExercisePricePerShare |  |  |  |  |  |  |  |
Eligible stock options exchanged for new stock options granted | 3,785,000 simo_NumberOfOptionsExchangedUnderOptionExchangeProgram |  |  |  |  |  |  |  |
Stock Option Granted |  | 0 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod | 0 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod | 0 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod |  |  |  |  |
Stock Option Granted Intrinsic Value |  | $ 1,565 us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1 | $ 594 us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1 | $ 318 us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1 |  |  |  |  |
Total unrecognized compensation cost related to non-vested share-based compensation |  |  |  |  |  |  |  |  |
Cash received from employee toward stock option exercise |  | 514 us-gaap_EmployeeServiceShareBasedCompensationCashReceivedFromExerciseOfStockOptions | 422 us-gaap_EmployeeServiceShareBasedCompensationCashReceivedFromExerciseOfStockOptions | 224 us-gaap_EmployeeServiceShareBasedCompensationCashReceivedFromExerciseOfStockOptions |  |  |  |  |
Tax effect for stock-based compensation benefit (expense) |  | (24)simo_ShareBasedCompensationTaxExpenseBenefit | 343 simo_ShareBasedCompensationTaxExpenseBenefit | 631 simo_ShareBasedCompensationTaxExpenseBenefit |  |  |  |  |
Minimum |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Stock option granted exercise price | $ 1.85 simo_ExercisePriceRangeOfStockOptionsSubjectToExchangeProgram / us-gaap_RangeAxis = us-gaap_MinimumMember |  |  |  |  |  |  |  |
2005 Equity Incentive Plan |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Number of option exercisable |  |  |  |  |  |  |  |  | 10,000,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber / us-gaap_PlanNameAxis = simo_EquityIncentivePlanTwentyZeroFiveMember
Ordinary shares for issuance upon exercise of stock options and restricted stock units |  |  |  |  | 15,000,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfAdditionalSharesAuthorized / us-gaap_PlanNameAxis = simo_EquityIncentivePlanTwentyZeroFiveMember | 15,000,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfAdditionalSharesAuthorized / us-gaap_PlanNameAxis = simo_EquityIncentivePlanTwentyZeroFiveMember |  |  |
Conversion ratio of restricted stock unit to ordinary shares |  | One-for-one |  |  |  |  |  |  |
Employee Stock Option Plan, 2004 |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Number of option outstanding |  |  |  |  |  |  | 8,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber / us-gaap_AwardTypeAxis = simo_EmployeeStockOptionPlanTwentyZeroFourMember |  |
Number of option exercisable |  |  |  |  |  |  | 1,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber / us-gaap_AwardTypeAxis = simo_EmployeeStockOptionPlanTwentyZeroFourMember |  |
Option expiration period |  |  |  |  |  |  | 6 years |  |
Employee stock option description |  | The options may be granted to qualified employees of the Company or any of its domestic or foreign subsidiaries and expire no later than six years from the date of grant. The options were granted at an exercise price not lower than the market value of SMI Taiwan's common stock at the date of the grant and vest over four years at certain percentages after two years from the date of grant. As part of the share exchange between the Company and the shareholders of SMI Taiwan effective on April 25, 2005, the Company agreed to assume the share options previously issued by SMI Taiwan. Subsequently on June 3, 2005, the Company amended the 2004 Plan such that options under the 2004 Plan are granted at an exercise price not lower than the market value of the Company's ordinary shares at the date of the grant and vest over four years at certain percentages after one year from the date of grant. |  |  |  |  |  |  |
Restricted Stock Units | 2005 Equity Incentive Plan |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Total unrecognized compensation cost related to non-vested share-based compensation |  | 2,463 us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember / us-gaap_PlanNameAxis = simo_EquityIncentivePlanTwentyZeroFiveMember |  |  |  |  |  |  |
Stock Options And Restricted Stock Units Exercised |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Tax effect for stock-based compensation benefit (expense) |  | $ 1,231 simo_ShareBasedCompensationTaxExpenseBenefit / us-gaap_AwardTypeAxis = simo_StockOptionsAndRestrictedStockUnitsExercisedMember | $ 1,599 simo_ShareBasedCompensationTaxExpenseBenefit / us-gaap_AwardTypeAxis = simo_StockOptionsAndRestrictedStockUnitsExercisedMember | $ 1,560 simo_ShareBasedCompensationTaxExpenseBenefit / us-gaap_AwardTypeAxis = simo_StockOptionsAndRestrictedStockUnitsExercisedMember |  |  |  |  |

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- Definition Describe the conversion features of common stock if such stock is convertible. That is, shares of common stock into which another convertible security was converted, or shares of common stock into which another class of common stock was converted. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.29) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 30 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21506-112644 + Details
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- Definition Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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