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Financial income, net (Narrative) (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014
Net Investment Income [Line Items] |
Loss resulting from devaluation of the local currency in Venezuela | $ 24,771 crnt_ForeignCurrencyTransactionRemeasurementGainLoss
Venezuela and Argentina [Member] |
Net Investment Income [Line Items] |
Loss resulting from devaluation of the local currency in Venezuela | $ 2,170 crnt_ForeignCurrencyTransactionRemeasurementGainLoss / us-gaap_StatementGeographicalAxis = crnt_SegmentGeographicalGroupsOfCountriesGroupFiveMember

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- Definition Represents the amount of foreign currency transaction remeasurement gain (loss) recognized in the income statement. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |