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Taxes on Income (Narrative) (Details) In Thousands, unless otherwise specified | 12 Months Ended |  |  | 1 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | ---
Dec. 31, 2014 USD ($) | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2014 Beneficial Enterprise [Member] USD ($) | Dec. 31, 2013 Beneficial Enterprise [Member] USD ($) | Aug. 31, 2013 Israel Tax Reform [Member] | Dec. 31, 2014 Manufacturing Plant [Member] | Dec. 31, 2014 Research and Development Center [Member] | Dec. 31, 2014 Development Area A [Member] Preferred Enterprise [Member] | Dec. 31, 2014 Rest of Country [Member] Preferred Enterprise [Member] | Dec. 31, 2014 Minimum [Member] Beneficial Enterprise [Member] ILS | Dec. 31, 2014 Minimum [Member] Expansion [Member] ILS | Dec. 31, 2014 Minimum [Member] Specific Foreign Market [Member] Beneficial Enterprise [Member] | Dec. 31, 2014 Maximum [Member] Beneficial Enterprise [Member] | Dec. 31, 2014 Maximum [Member] Expansion [Member] | Dec. 31, 2014 Maximum [Member] Specific Foreign Market [Member] Beneficial Enterprise [Member]
Income Tax Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Tax rate | 26.50%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate | 25.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate | 25.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate |  |  |  |  |  |  |  |  |  |  |  |  |
Number of years of tax exemption |  |  |  |  |  |  | 10 years | 2 years |  |  |  |  |  |  |  |
Tax rate increase |  |  |  |  |  | 1.50%silc_EffectiveIncomeTaxRateIncrease / us-gaap_StatementScenarioAxis = silc_IsraelTaxReformMember |  |  |  |  |  |  |  |  |  |
Maximum percent of taxable income for the plan |  |  |  |  |  |  |  | 25.00%silc_MaximumPercentOfTaxableIncomeForPlan / us-gaap_StatementGeographicalAxis = silc_ResearchAndDevelopmentCenterMember |  |  |  |  |  |  |  |
Tax exemption |  |  |  | $ 44,892silc_TaxExemptionAmount / us-gaap_StatementScenarioAxis = silc_BeneficialEnterpriseMember | $ 50,683silc_TaxExemptionAmount / us-gaap_StatementScenarioAxis = silc_BeneficialEnterpriseMember |  |  |  |  |  |  |  |  |  |  |
Assumed income tax liability |  |  |  | 11,223silc_AssumedDeferredTaxLiabilityNotRecognizedRelatedToTaxExemptRetainedEarningsDueToApprovedEnterpriseAndBenefitedEnterpriseStatus / us-gaap_StatementScenarioAxis = silc_BeneficialEnterpriseMember | 12,671silc_AssumedDeferredTaxLiabilityNotRecognizedRelatedToTaxExemptRetainedEarningsDueToApprovedEnterpriseAndBenefitedEnterpriseStatus / us-gaap_StatementScenarioAxis = silc_BeneficialEnterpriseMember |  |  |  |  |  |  |  |  |  |  |
Number of years of benefited tax rate under the alternative benefits method for the research and development center |  |  |  |  |  |  |  | 8 years |  |  |  |  |  |  |  |
Corporate tax on cash dividends distributed from exempted profits |  | 25.00%silc_CorporateTaxOnCashDividendsDistributedFromExemptedProfits |  |  |  |  |  |  |  |  |  |  |  |  |  |
Withholding tax deduction from cash dividends distributed from benefited profits | 20.00%silc_WithholdingTaxDeductionFromCashDividendsDistributedFromBenefitedProfits | 15.00%silc_WithholdingTaxDeductionFromCashDividendsDistributedFromBenefitedProfits |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of revenue from one country to receive tax benefits |  |  |  |  |  |  |  |  |  |  |  |  | 25.00%silc_PercentageOfRevenueFromOneCountryToReceiveTaxBenefits / us-gaap_RangeAxis = us-gaap_MinimumMember / us-gaap_StatementGeographicalAxis = silc_SpecificForeignMarketMember / us-gaap_StatementScenarioAxis = silc_BeneficialEnterpriseMember |  |  | 75.00%silc_PercentageOfRevenueFromOneCountryToReceiveTaxBenefits / us-gaap_RangeAxis = us-gaap_MaximumMember / us-gaap_StatementGeographicalAxis = silc_SpecificForeignMarketMember / us-gaap_StatementScenarioAxis = silc_BeneficialEnterpriseMember
Market size criteria to receive tax benefits, number of residents (people) |  |  |  |  |  |  |  |  |  |  |  |  | 14,000,000silc_MarketSizeCriteriaToReceiveTaxBenefitsNumberOfResidents / us-gaap_RangeAxis = us-gaap_MinimumMember / us-gaap_StatementGeographicalAxis = silc_SpecificForeignMarketMember / us-gaap_StatementScenarioAxis = silc_BeneficialEnterpriseMember |  |  |
Required investment in production machinery and equipment to receive tax benefits |  |  |  |  |  |  |  |  |  |  | 300silc_RequiredInvestmentInProductionMachineryAndEquipmentToReceiveTaxBenefits / us-gaap_RangeAxis = us-gaap_MinimumMember / us-gaap_StatementScenarioAxis = silc_BeneficialEnterpriseMember | 300silc_RequiredInvestmentInProductionMachineryAndEquipmentToReceiveTaxBenefits / us-gaap_RangeAxis = us-gaap_MinimumMember / us-gaap_StatementScenarioAxis = silc_ExpansionMember |  |  |  |
Time allowed to meet investment in production machinery and equipment to receive tax benefits |  |  |  |  |  |  |  |  |  |  |  |  |  | 3 years | 3 years |
Tax rate 2014 and thereafter |  |  |  |  |  | 26.50%silc_CorporateStatutoryTaxRateNextTwelveMonthsAndThereafter / us-gaap_StatementScenarioAxis = silc_IsraelTaxReformMember |  |  | 9.00%silc_CorporateStatutoryTaxRateNextTwelveMonthsAndThereafter / us-gaap_StatementGeographicalAxis = silc_DevelopmentAreaMember / us-gaap_StatementScenarioAxis = silc_PreferredEnterpriseMember | 16.00%silc_CorporateStatutoryTaxRateNextTwelveMonthsAndThereafter / us-gaap_StatementGeographicalAxis = silc_RestOfCountryMember / us-gaap_StatementScenarioAxis = silc_PreferredEnterpriseMember |  |  |  |  |  |
Non-Israeli subsidiaries' undistributed earnings for which Company has not provided for Israeli income and foreign withholding taxes | 1,850us-gaap_UndistributedEarningsOfForeignSubsidiaries |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Assumed deferred tax liability attributable to taxable temporary differences from non-Israeli subsidiaries'' undistributed earnings | $ 218silc_AssumedDeferredTaxLiabilitiesUndistributedForeignEarnings |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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