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Commitments And Contingencies - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified | 1 Months Ended | 12 Months Ended | 1 Months Ended |  |
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Jul. 31, 2010 | Mar. 31, 2010 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Jan. 31, 2012 | Jan. 31, 2014 | Dec. 31, 2014 | Apr. 17, 2009 | Apr. 25, 2007
Commitments and Contingencies Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |
Operating lease rental expenses |  |  | $ 1,981 us-gaap_OperatingLeasesRentExpenseNet | $ 1,763 us-gaap_OperatingLeasesRentExpenseNet | $ 1,609 us-gaap_OperatingLeasesRentExpenseNet |  |  |  |  |
Minimum operating lease payment, 2015 |  |  | 1,977 us-gaap_OperatingLeasesFutureMinimumPaymentsDueCurrent |  |  |  |  | 1,977 us-gaap_OperatingLeasesFutureMinimumPaymentsDueCurrent |  |
Minimum operating lease payment, 2016 |  |  | 1,367 us-gaap_OperatingLeasesFutureMinimumPaymentsDueInTwoYears |  |  |  |  | 1,367 us-gaap_OperatingLeasesFutureMinimumPaymentsDueInTwoYears |  |
Minimum operating lease payment, 2017 |  |  | 662 us-gaap_OperatingLeasesFutureMinimumPaymentsDueInThreeYears |  |  |  |  | 662 us-gaap_OperatingLeasesFutureMinimumPaymentsDueInThreeYears |  |
Minimum operating lease payment, 2018 |  |  | 555 us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFourYears |  |  |  |  | 555 us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFourYears |  |
Minimum operating lease payment, 2019 |  |  | 183 us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFiveYears |  |  |  |  | 183 us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFiveYears |  |
Adversary proceeding pending on litigation filled by AASI creditor liquidating trust |  |  |  |  |  |  |  |  | 854 simo_LitigationSettlementLiabilitiesCurrent |
Litigation settlement expenses |  | 220 us-gaap_LitigationSettlementExpense |  |  |  |  |  |  |  |
Percentage of total investment forfeited from FCI, TLi Inc. ("TLI"), OCI Materials Co., Ltd ("OCI")upon withdrew from the Pangyo Cooperative | 10.00%simo_PercentageOfInvestmentForfeited |  |  |  |  |  |  |  |  |
FCI |  |  |  |  |  |  |  |  |  |
Commitments and Contingencies Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |
Restricted cash deposited |  |  | 455 us-gaap_RestrictedCashAndInvestments / dei_LegalEntityAxis = simo_FciIncMember | 946 us-gaap_RestrictedCashAndInvestments / dei_LegalEntityAxis = simo_FciIncMember |  |  |  | 455 us-gaap_RestrictedCashAndInvestments / dei_LegalEntityAxis = simo_FciIncMember |  |
All American |  |  |  |  |  |  |  |  |  |
Commitments and Contingencies Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |
Unpaid accounts receivable from distributor, filed for Chapter 11 bankruptcy protection |  |  |  |  |  |  |  |  |  | 256 us-gaap_AccountsReceivableGross / dei_LegalEntityAxis = simo_AllAmericanMember
All American | First Distribution |  |  |  |  |  |  |  |  |  |
Commitments and Contingencies Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |
Distribution claim received as beneficiary |  |  |  |  |  | 21 simo_DistributionsReceivedByCompany / simo_DivisionOfStockIssuedAxis = simo_FirstTargetDistributionMember / dei_LegalEntityAxis = simo_AllAmericanMember |  |  |  |
All American | Second Distribution |  |  |  |  |  |  |  |  |  |
Commitments and Contingencies Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |
Distribution claim received as beneficiary |  |  |  |  |  |  | 36 simo_DistributionsReceivedByCompany / simo_DivisionOfStockIssuedAxis = simo_SecondTargetDistributionMember / dei_LegalEntityAxis = simo_AllAmericanMember |  |  |
All American | Third Distribution |  |  |  |  |  |  |  |  |  |
Commitments and Contingencies Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |
Distribution claim received as beneficiary |  |  |  |  |  |  |  | $ 12 simo_DistributionsReceivedByCompany / simo_DivisionOfStockIssuedAxis = simo_ThirdTargetDistributionMember / dei_LegalEntityAxis = simo_AllAmericanMember |  |

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- Definition Amount of required minimum rental payments for operating leases having an initial or remaining non-cancelable lease term in excess of one year due in the next fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6453985&loc=d3e41502-112717 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 10 -Section 55 -Paragraph 40 -Subparagraph (Note 3) -URI http://asc.fasb.org/extlink&oid=6584154&loc=d3e38371-112697 + Details
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- Definition Amount of required minimum rental payments for operating leases having an initial or remaining non-cancelable lease term in excess of one year due in the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6453985&loc=d3e41502-112717 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 10 -Section 55 -Paragraph 40 -Subparagraph (Note 3) -URI http://asc.fasb.org/extlink&oid=6584154&loc=d3e38371-112697 + Details
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- Definition Amount of required minimum rental payments for operating leases having an initial or remaining non-cancelable lease term in excess of one year due in the fourth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6453985&loc=d3e41502-112717 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 10 -Section 55 -Paragraph 40 -Subparagraph (Note 3) -URI http://asc.fasb.org/extlink&oid=6584154&loc=d3e38371-112697 + Details
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- Definition Amount of required minimum rental payments for operating leases having an initial or remaining non-cancelable lease term in excess of one year due in the third fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6453985&loc=d3e41502-112717 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 10 -Section 55 -Paragraph 40 -Subparagraph (Note 3) -URI http://asc.fasb.org/extlink&oid=6584154&loc=d3e38371-112697 + Details
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- Definition Amount of required minimum rental payments for operating leases having an initial or remaining non-cancelable lease term in excess of one year due in the second fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6453985&loc=d3e41502-112717 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 10 -Section 55 -Paragraph 40 -Subparagraph (Note 3) -URI http://asc.fasb.org/extlink&oid=6584154&loc=d3e38371-112697 + Details
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- Definition Rental expense for the reporting period incurred under operating leases, including minimum and any contingent rent expense, net of related sublease income. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6453985&loc=d3e41499-112717 + Details
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