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Taxes On Income (Narrative) (Details)
In Thousands, unless otherwise specified
 12 Months Ended 12 Months Ended 12 Months Ended
Dec. 31, 2014
ILS
Dec. 31, 2013
USD ($)
Dec. 31, 2012
Dec. 31, 2014
USD ($)
Dec. 31, 2014
Internal Revenue Service (IRS) [Member]
USD ($)
Dec. 31, 2014
Domestic Tax Authority [Member]
USD ($)
Dec. 31, 2014
Law for the Encouragement of Industry (Taxes) [Member]
Dec. 31, 2014
Law for the Encouragement of Capital Investments [Member]
Dec. 31, 2014
NORWAY
USD ($)
Dec. 31, 2014
BRAZIL
USD ($)
Dec. 31, 2014
Minimum [Member]
Dec. 31, 2014
Maximum [Member]
Dec. 31, 2014
Develpment Area A [Member]
Law for the Encouragement of Capital Investments [Member]
Taxes On Income [Line Items]                          
Period of tax exemption 2 years                        
Period in which investment must be made 3 years                        
Minimum qualifying investment 300crnt_MinimumQualifyingInvestment                        
Experation period since approval 14 years                        
Experation period since enterpise began operating 12 years                        
Experation period since beginning of the year of election 12 years                        
Foreign investors'' company tax benefits period 10 years                        
Foreign investors' company tax benefits pecent                     10.00%crnt_ForeignInvestorsCompanyTaxBenefitsPecent
/ us-gaap_RangeAxis
= us-gaap_MinimumMember		 25.00%crnt_ForeignInvestorsCompanyTaxBenefitsPecent
/ us-gaap_RangeAxis
= us-gaap_MaximumMember		  
Number of capital investment programs granted approved enterprise status       3crnt_NumberOfCapitalInvestmentProgramsGrantedApprovedEnterpriseStatus                  
Number of capital investment programs under beneficiary enterprise status       2crnt_NumberOfCapitalInvestmentProgramsUnderBeneficiaryEnterpriseStatus                  
Amended tax rate 2011 and 2012               15.00%crnt_AmendedTaxRateYearsOneAndTwo
/ us-gaap_IncomeTaxAuthorityAxis
= crnt_LawForEncouragementOfCapitalInvestmentsMember		          
Amended tax rate 2013 and 2014               12.50%crnt_AmendedTaxRateYearsThreeAndFour
/ us-gaap_IncomeTaxAuthorityAxis
= crnt_LawForEncouragementOfCapitalInvestmentsMember		          
Amended tax rate 2015 and thereafter               12.00%crnt_AmendedTaxRateYearsFiveAndAfter
/ us-gaap_IncomeTaxAuthorityAxis
= crnt_LawForEncouragementOfCapitalInvestmentsMember		          
Amended tax rate 2014 and thereafter               16.00%crnt_AmendedTaxRateYear2014AndThereafter
/ us-gaap_IncomeTaxAuthorityAxis
= crnt_LawForEncouragementOfCapitalInvestmentsMember		         9.00%crnt_AmendedTaxRateYear2014AndThereafter
/ us-gaap_IncomeTaxAuthorityAxis
= crnt_LawForEncouragementOfCapitalInvestmentsMember
/ us-gaap_RangeAxis
= crnt_DevelopmentAreaMember
Tax rate on dividends distributed to individuals or foreign residents from the preferred enterprise's earnings               20.00%crnt_PreferredEnterpriseDividendTaxRate
/ us-gaap_IncomeTaxAuthorityAxis
= crnt_LawForEncouragementOfCapitalInvestmentsMember		          
Industrial company defined as a company resident in Israel based on minimum percentage of income derived from an industrial enterprise owned by it             90.00%crnt_IndustrialCompanyDefinedAsCompanyResidentInIsraelBasedOnMinimumPercentageOfIncomeDerivedFromIndustrialEnterpriseOwnedByIt
/ us-gaap_IncomeTaxAuthorityAxis
= crnt_LawForEncouragementOfIndustryTaxesMember		            
Amortization period for know-how and patents             8 years            
Amortization period for deferred stock issuance costs             3 years            
Israeli tax rate 26.50%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate 25.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate 25.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate                    
Valuation allowance   81,665us-gaap_DeferredTaxAssetsValuationAllowance   108,292us-gaap_DeferredTaxAssetsValuationAllowance                  
Net operating losses         1,399us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsDomestic
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_InternalRevenueServiceIRSMember		 221,187us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsDomestic
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_DomesticCountryMember		     35,131us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsDomestic
/ us-gaap_IncomeTaxAuthorityAxis
= country_NO		 13,133us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsDomestic
/ us-gaap_IncomeTaxAuthorityAxis
= country_BR		      
Israeli capital loss           4,436us-gaap_DeferredTaxAssetsCapitalLossCarryforwards
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_DomesticCountryMember		              
Annual limit against taxable income                   30.00%crnt_OperatingLossCarryforwardsAnnualLimitationsOnUse
/ us-gaap_IncomeTaxAuthorityAxis
= country_BR		      
Accrued interest and penalties   $ (83)us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued   $ 0us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued