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

X

- 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

X

- Details

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

X

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: