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Segments, Customers And Geographic Information (Schedule Of Major Customer Data As Percentage Of Total Revenues) (Details)	12 Months Ended
	Dec. 31, 2012		Dec. 31, 2011		Dec. 31, 2010
Concentration Risk [Line Items]
Percentage of total revenues	10.00%
Customer A [Member] | Customer Concentration Risk [Member] | Sales Revenue [Member]
Concentration Risk [Line Items]
Concentration Risk, Percentage		[1]		[1]	19.00%
Customer B [Member] | Customer Concentration Risk [Member] | Sales Revenue [Member]
Concentration Risk [Line Items]
Concentration Risk, Percentage		[1]		[1]	17.00%
Affiliated Party Customer [Member] | Customer Concentration Risk [Member] | Sales Revenue [Member]
Concentration Risk [Line Items]
Concentration Risk, Percentage	11.60%		13.40%
[1] Less than 10% of total revenues

X

- Definition

Percentage of total revenues.

+ References

No definition available.

+ Details

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Namespace Prefix:	crnt_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Details

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

X

- Definition

For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 275

-SubTopic 10

-Section 50

-Paragraph 18

-URI http://asc.fasb.org/extlink&oid=6927468&loc=d3e6351-108592



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 825

-SubTopic 10

-Section 50

-Paragraph 21

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=7491637&loc=d3e13537-108611



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 275

-SubTopic 10

-Section 50

-Paragraph 20

-URI http://asc.fasb.org/extlink&oid=6927468&loc=d3e6404-108592



Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 825

-SubTopic 10

-Section 50

-Paragraph 20

-URI http://asc.fasb.org/extlink&oid=7491637&loc=d3e13531-108611

+ Details

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Balance Type:	na
Period Type:	duration