v2.4.1.9

Defined Contribution Bonus and Profit Sharing Plans Defined Contribution, Bonus, and Profit Sharing Narrative (Details) (Employer Match Percentage [Member]) | 12 Months Ended
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Dec. 31, 2014
Employer Match Percentage [Member] |
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items] |
Percentage of employer match into employee savings plan. | 50.00%itri_PercentageOfEmployerMatchIntoEmployeeSavingsPlan / itri_DefinedContributionByNatureAxis = itri_EmployerMatchPercentageMember
Employer Matching Contribution, Percent of Employees' Gross Pay | 6.00%us-gaap_DefinedContributionPlanEmployerMatchingContributionPercent / itri_DefinedContributionByNatureAxis = itri_EmployerMatchPercentageMember

X
- Definition Percentage of employer match into employee savings plan. + References No definition available. + Details
Name: | itri_PercentageOfEmployerMatchIntoEmployeeSavingsPlan
Namespace Prefix: | itri_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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

X
- Definition Percentage of employees' gross pay for which the employer contributes a matching contribution to a defined contribution plan. + References No definition available. + Details
Name: | us-gaap_DefinedContributionPlanEmployerMatchingContributionPercent
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration