v2.4.0.6

Income Tax Policy Additional Information (Details) (Minimum [Member]) | 3 Months Ended
--- | ---
Mar. 31, 2013
Minimum [Member] |
Income Tax Contingency [Line Items] |
Income Tax Examination Likelihood Of Favorable Settlement Minimum For Recognition | 50.00%

X
- Definition Income Tax Examination Likelihood Of Favorable Settlement Minimum For Recognition + References No definition available. + Details
Name: | itri_IncomeTaxExaminationLikelihoodOfFavorableSettlementMinimumForRecognition
Namespace Prefix: | itri_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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