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Fair Value Measurement (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014		Dec. 31, 2013
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities	$ 535us-gaap_AvailableForSaleSecurities		$ 9,484us-gaap_AvailableForSaleSecurities
Derivatives instruments	(13)us-gaap_DerivativeAssetsLiabilitiesAtFairValueNet		314us-gaap_DerivativeAssetsLiabilitiesAtFairValueNet
Pension liability, net	(3,254)crnt_PensionLiabilityFairValueDisclosure	[1]	(4,076)crnt_PensionLiabilityFairValueDisclosure	[1]
Total assets (liabilities)	(2,732)crnt_AssetsLiabilitiesFairValueDisclosure		5,722crnt_AssetsLiabilitiesFairValueDisclosure
Derivatives instruments, tax effect	36us-gaap_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesTax		114us-gaap_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesTax
Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities	535us-gaap_AvailableForSaleSecurities / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member		9,484us-gaap_AvailableForSaleSecurities / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member
Derivatives instruments
Pension liability, net		[1]		[1]
Total assets (liabilities)	535crnt_AssetsLiabilitiesFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member		9,484crnt_AssetsLiabilitiesFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member
Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities
Derivatives instruments	(13)us-gaap_DerivativeAssetsLiabilitiesAtFairValueNet / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member		314us-gaap_DerivativeAssetsLiabilitiesAtFairValueNet / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member
Pension liability, net		[1]		[1]
Total assets (liabilities)	(13)crnt_AssetsLiabilitiesFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member		314crnt_AssetsLiabilitiesFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member
Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities
Derivatives instruments
Pension liability, net	(3,254)crnt_PensionLiabilityFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member	[1]	(4,076)crnt_PensionLiabilityFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member	[1]
Total assets (liabilities)	$ (3,254)crnt_AssetsLiabilitiesFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member		$ (4,076)crnt_AssetsLiabilitiesFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member
[1] *) See also note 12.

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Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

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-Name Accounting Standards Codification

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-SubTopic 10

-Section 25

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Fair values as of the balance sheet date of the net amount of all assets and liabilities resulting from contracts that meet the criteria of being accounted for as derivative instruments.

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Amount of tax expense (benefit), after reclassification adjustments, of increase (decrease) in accumulated gain (loss) from derivative instruments designated and qualifying as the effective portion of cash flow hedges and an entity's share of an equity investee's increase (decrease) in deferred hedging gain (loss).

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