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Related Party Balances And Transactions (Narrative) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Rent And Maintenance [Member]
Related Party Transaction [Line Items]
Expenses	$ 2,046us-gaap_RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty / us-gaap_NatureOfExpenseAxis = crnt_RentAndMaintenanceMember	$ 2,412us-gaap_RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty / us-gaap_NatureOfExpenseAxis = crnt_RentAndMaintenanceMember	$ 2,121us-gaap_RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty / us-gaap_NatureOfExpenseAxis = crnt_RentAndMaintenanceMember
Purchase Of Property And Equpment [Member]
Related Party Transaction [Line Items]
Expenses	100us-gaap_RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty / us-gaap_NatureOfExpenseAxis = crnt_PurchaseOfPropertyAndEqupmentMember	265us-gaap_RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty / us-gaap_NatureOfExpenseAxis = crnt_PurchaseOfPropertyAndEqupmentMember	1,130us-gaap_RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty / us-gaap_NatureOfExpenseAxis = crnt_PurchaseOfPropertyAndEqupmentMember
RAD-BYNET [Member]
Related Party Transaction [Line Items]
Reimbursements for services provided	1,699crnt_RelatedPartyTransactionReimbursementsForServicesProvided / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = crnt_RadBynetMember	1,197crnt_RelatedPartyTransactionReimbursementsForServicesProvided / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = crnt_RadBynetMember	1,476crnt_RelatedPartyTransactionReimbursementsForServicesProvided / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = crnt_RadBynetMember
RAD-BYNET [Member] | Inventories [Member]
Related Party Transaction [Line Items]
Expenses	4,149us-gaap_RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty / us-gaap_NatureOfExpenseAxis = us-gaap_InventoriesMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = crnt_RadBynetMember	4,770us-gaap_RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty / us-gaap_NatureOfExpenseAxis = us-gaap_InventoriesMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = crnt_RadBynetMember	4,310us-gaap_RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty / us-gaap_NatureOfExpenseAxis = us-gaap_InventoriesMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = crnt_RadBynetMember
RAD-BYNET [Member] | Purchase Of Property And Equpment [Member]
Related Party Transaction [Line Items]
Expenses	$ 100us-gaap_RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty / us-gaap_NatureOfExpenseAxis = crnt_PurchaseOfPropertyAndEqupmentMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = crnt_RadBynetMember	$ 265us-gaap_RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty / us-gaap_NatureOfExpenseAxis = crnt_PurchaseOfPropertyAndEqupmentMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = crnt_RadBynetMember	$ 1,130us-gaap_RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty / us-gaap_NatureOfExpenseAxis = crnt_PurchaseOfPropertyAndEqupmentMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = crnt_RadBynetMember

X

- Definition

Related Party Transaction, reimbursements for services provided

+ References

No definition available.

+ Details

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Namespace Prefix:	crnt_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Expenses recognized resulting from transactions (excluding transactions that are eliminated in consolidated or combined financial statements) with related party.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 850

-SubTopic 10

-Section 50

-Paragraph 1

-Subparagraph (c)

-URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39549-107864

+ Details

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Balance Type:	debit
Period Type:	duration

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- Details

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Balance Type:	na
Period Type:	duration

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- Details

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Namespace Prefix:
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Balance Type:
Period Type:

X

- Details

Name:	us-gaap_NatureOfExpenseAxis=crnt_RentAndMaintenanceMember
Namespace Prefix:
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Balance Type:
Period Type:

X

- Details

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Namespace Prefix:
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Balance Type:
Period Type: