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v2.4.1.9

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

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- Definition Related Party Transaction, reimbursements for services provided + References No definition available. + Details
Name: | crnt_RelatedPartyTransactionReimbursementsForServicesProvided
Namespace Prefix: | crnt_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- 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
Name: | us-gaap_RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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

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- Details
Name: | us-gaap_NatureOfExpenseAxis=crnt_PurchaseOfPropertyAndEqupmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_NatureOfExpenseAxis=crnt_RentAndMaintenanceMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=crnt_RadBynetMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |