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Taxes on Income - Additional Information (Detail) (USD $)
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Income Taxes [Line Items]      
Tax benefits under the Law for the Encouragement of Capital Investments period 10 years    
Period of Income tax benefit - tax exempt 2 years    
Tax benefit expiration period 2022    
Tax rate of Approved enterprise, 2011-2012 15.00%orbk_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRateYearOnePercent    
Tax rate of Approved enterprise, 2013 12.50%orbk_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRateYearTwoPercent    
Tax rate of Approved enterprise, thereafter 16.00%orbk_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRateThereafterPercent    
Percentage of tax subject to dividends distributed from Preferred Income 20.00%orbk_PercentageTaxDueOnDividendDistributions    
Carryforward tax losses total $ 197,000,000us-gaap_OperatingLossCarryforwards    
Carryforward tax losses without expiration date 71,400,000orbk_OperatingLossCarryforwardsNoExpiration    
Federal operation losses carryforward expiration beginning year 2017    
Federal operation losses carryforward expiration ending year 2027    
Deferred tax assets valuation allowance 43,000,000us-gaap_OperatingLossCarryforwardsValuationAllowance 43,900,000us-gaap_OperatingLossCarryforwardsValuationAllowance  
Carryforward capital losses for tax purposes totaled 19,300,000orbk_OperatingLossCarryforwardsCapitalLoss    
Deferred income taxes (568,000)us-gaap_DeferredIncomeTaxExpenseBenefit (1,558,000)us-gaap_DeferredIncomeTaxExpenseBenefit (5,440,000)us-gaap_DeferredIncomeTaxExpenseBenefit
Tax payable upon dividend distribution 29,000,000orbk_TaxPayableUponDividendDistribution    
Net interest and penalties expenses (100,000)us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestExpense (900,000)us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestExpense 200,000us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestExpense
Net interest and penalties expenses related to unrecognized tax benefit 1,100,000us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued 900,000us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued  
Decrease in reserve for uncertain tax positions and deferred tax assets 1,200,000us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromCurrentPeriodTaxPositions    
US Subsidiary [Member]      
Income Taxes [Line Items]      
Carryforward tax losses total 118,000,000us-gaap_OperatingLossCarryforwards
/ dei_LegalEntityAxis
= orbk_UsSubsidiaryMember		    
Israel [Member]      
Income Taxes [Line Items]      
Corporate tax rate   25.00%orbk_CorporateTaxRate
/ us-gaap_IncomeTaxAuthorityAxis
= country_IL		 25.00%orbk_CorporateTaxRate
/ us-gaap_IncomeTaxAuthorityAxis
= country_IL
Corporate tax rate due thereafter 26.50%orbk_CorporateTaxRateDueThereafter
/ us-gaap_IncomeTaxAuthorityAxis
= country_IL		    
Deferred income taxes $ 954,000us-gaap_DeferredIncomeTaxExpenseBenefit
/ us-gaap_IncomeTaxAuthorityAxis
= country_IL		 $ 255,000us-gaap_DeferredIncomeTaxExpenseBenefit
/ us-gaap_IncomeTaxAuthorityAxis
= country_IL		 $ (4,985,000)us-gaap_DeferredIncomeTaxExpenseBenefit
/ us-gaap_IncomeTaxAuthorityAxis
= country_IL
Minimum [Member]      
Income Taxes [Line Items]      
Income tax rate range 15.00%orbk_EffectiveIncomeTaxRate
/ us-gaap_RangeAxis
= us-gaap_MinimumMember		    
Federal operating losses carryforward expired 15 years    
Minimum [Member] | Israeli Taxation [Member]      
Income Taxes [Line Items]      
Range of deferred taxes rate 12.00%orbk_EstimatedEffectiveIncomeTaxRate
/ dei_LegalEntityAxis
= orbk_IsraeliTaxationMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember		    
Minimum [Member] | Non Israeli Subsidiaries [Member]      
Income Taxes [Line Items]      
Range of deferred taxes rate 12.00%orbk_EstimatedEffectiveIncomeTaxRate
/ dei_LegalEntityAxis
= orbk_NonIsraeliSubsidiariesMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember		    
Minimum [Member] | Israel [Member] | Other Development Projects [Member]      
Income Taxes [Line Items]      
Percentage of tax subject to dividends distributed from Preferred Income 15.00%orbk_PercentageTaxDueOnDividendDistributions
/ us-gaap_IncomeTaxAuthorityAxis
= country_IL
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_StatementGeographicalAxis
= orbk_OtherDevelopmentProjectsMember		    
Maximum [Member]      
Income Taxes [Line Items]      
Income tax rate range 25.00%orbk_EffectiveIncomeTaxRate
/ us-gaap_RangeAxis
= us-gaap_MaximumMember		    
Federal operating losses carryforward expired 20 years    
Maximum [Member] | Israeli Taxation [Member]      
Income Taxes [Line Items]      
Range of deferred taxes rate 26.50%orbk_EstimatedEffectiveIncomeTaxRate
/ dei_LegalEntityAxis
= orbk_IsraeliTaxationMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember		    
Maximum [Member] | Non Israeli Subsidiaries [Member]      
Income Taxes [Line Items]      
Range of deferred taxes rate 38.00%orbk_EstimatedEffectiveIncomeTaxRate
/ dei_LegalEntityAxis
= orbk_NonIsraeliSubsidiariesMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember