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
	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