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Business Acquired - Summary of Estimated Fair Value of Assets Acquired and Liabilities Assumed (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Aug. 07, 2014
Business Acquisition [Line Items]        
GOODWILL $ 179,445us-gaap_Goodwill $ 12,444us-gaap_Goodwill $ 12,444us-gaap_Goodwill  
SPTS Technologies Group Limited [Member]        
Business Acquisition [Line Items]        
Cash and cash equivalents       8,309us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCashAndEquivalents
/ us-gaap_BusinessAcquisitionAxis
= orbk_SptsTechnologiesGroupLimitedMember
Current assets, excluding inventory       38,056orbk_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsExcludingInventory
/ us-gaap_BusinessAcquisitionAxis
= orbk_SptsTechnologiesGroupLimitedMember
Inventories       49,108us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedInventory
/ us-gaap_BusinessAcquisitionAxis
= orbk_SptsTechnologiesGroupLimitedMember
Property, plant and equipment       25,160us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment
/ us-gaap_BusinessAcquisitionAxis
= orbk_SptsTechnologiesGroupLimitedMember
GOODWILL       167,001us-gaap_Goodwill
/ us-gaap_BusinessAcquisitionAxis
= orbk_SptsTechnologiesGroupLimitedMember
Total assets acquired       441,577us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssets
/ us-gaap_BusinessAcquisitionAxis
= orbk_SptsTechnologiesGroupLimitedMember
Current liabilities       38,246us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilities
/ us-gaap_BusinessAcquisitionAxis
= orbk_SptsTechnologiesGroupLimitedMember
Deferred taxes and other long-term liability       19,934us-gaap_DeferredIncomeTaxesAndOtherLiabilitiesNoncurrent
/ us-gaap_BusinessAcquisitionAxis
= orbk_SptsTechnologiesGroupLimitedMember
Total liabilities assumed       58,180us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilities
/ us-gaap_BusinessAcquisitionAxis
= orbk_SptsTechnologiesGroupLimitedMember
Net assets acquired       383,370us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet
/ us-gaap_BusinessAcquisitionAxis
= orbk_SptsTechnologiesGroupLimitedMember
In-Process Research & Development [Member] | SPTS Technologies Group Limited [Member]        
Business Acquisition [Line Items]        
Finite-lived intangibles       6,920us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles
/ us-gaap_BusinessAcquisitionAxis
= orbk_SptsTechnologiesGroupLimitedMember
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_InProcessResearchAndDevelopmentMember
Technology and Intellectual Property [Member] | SPTS Technologies Group Limited [Member]        
Business Acquisition [Line Items]        
Finite-lived intangibles       60,870us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles
/ us-gaap_BusinessAcquisitionAxis
= orbk_SptsTechnologiesGroupLimitedMember
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= orbk_TechnologyAndIntellectualPropertyMember
Customer Relations [Member] | SPTS Technologies Group Limited [Member]        
Business Acquisition [Line Items]        
Finite-lived intangibles       69,768us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles
/ us-gaap_BusinessAcquisitionAxis
= orbk_SptsTechnologiesGroupLimitedMember
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CustomerRelationshipsMember
Trade Names [Member] | SPTS Technologies Group Limited [Member]        
Business Acquisition [Line Items]        
Finite-lived intangibles       5,960us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles
/ us-gaap_BusinessAcquisitionAxis
= orbk_SptsTechnologiesGroupLimitedMember
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_TradeNamesMember
Backlog [Member] | SPTS Technologies Group Limited [Member]        
Business Acquisition [Line Items]        
Finite-lived intangibles       $ 10,398us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles
/ us-gaap_BusinessAcquisitionAxis
= orbk_SptsTechnologiesGroupLimitedMember
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_OrderOrProductionBacklogMember