v2.4.0.6

Subsequent Event (Details) (USD $) | 1 Months Ended
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Mar. 31, 2013 | May 02, 2013 Subsequent Event [Member]
Subsequent Event [Line Items] |  |
Stock Repurchased and Retired During Period, Shares | 4,490 | 65,339
Stock Repurchased and Retired During Period, Average Price Per Share |  | $ 43.34

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- Definition Stock Repurchased and Retired During Period, Average Price Per Share + References No definition available. + Details
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Namespace Prefix: | itri_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | duration

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- Definition Number of shares that have been repurchased and retired during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29, 30 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Principles Board Opinion (APB) -Number 12 -Paragraph 10 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 + Details
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Namespace Prefix: | us-gaap_
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Balance Type: | na
Period Type: | duration

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- Details
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Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration