v2.4.1.9

Segment Information Revenues By Region (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Revenues from External Customers [Line Items]
Total revenues	$ 510,095us-gaap_SalesRevenueNet	$ 496,454us-gaap_SalesRevenueNet	$ 489,353us-gaap_SalesRevenueNet	$ 474,795us-gaap_SalesRevenueNet	$ 523,526us-gaap_SalesRevenueNet	$ 495,491us-gaap_SalesRevenueNet	$ 482,175us-gaap_SalesRevenueNet	$ 447,536us-gaap_SalesRevenueNet	$ 1,970,697us-gaap_SalesRevenueNet	$ 1,948,728us-gaap_SalesRevenueNet	$ 2,178,178us-gaap_SalesRevenueNet
United States and Canada [Member]
Revenues from External Customers [Line Items]
Total revenues									899,399us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = itri_UnitedStatesAndCanadaMember	851,295us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = itri_UnitedStatesAndCanadaMember	1,014,739us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = itri_UnitedStatesAndCanadaMember
EMEA [Member]
Revenues from External Customers [Line Items]
Total revenues									848,502us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = us-gaap_EMEAMember	858,026us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = us-gaap_EMEAMember	878,615us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = us-gaap_EMEAMember
Other Countries [Member]
Revenues from External Customers [Line Items]
Total revenues									$ 222,796us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = itri_OtherCountriesMember	$ 239,407us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = itri_OtherCountriesMember	$ 284,824us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = itri_OtherCountriesMember

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- Definition

Total revenue from sale of goods and services rendered during the reporting period, in the normal course of business, reduced by sales returns and allowances, and sales discounts.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 225

-SubTopic 10

-Section S99

-Paragraph 2

-Subparagraph (SX 210.5-03.1)

-URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688



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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 1

-Article 5

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