v2.4.1.9

Commitments and Contingencies Commitments and Contingencies Narrative (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2008 | Dec. 31, 2011
Product Warranty Expense, Change | $ 5.7 itri_ProductWarrantyExpenseChange | $ 2.7 itri_ProductWarrantyExpenseChange |  |
Warranty charge | 4.0 itri_WarrantyCharge |  |  |
Litigation Settlement, Amount | $ 14.7 us-gaap_LitigationSettlementAmount |  |  |
Itron Sistemas e Technologia Ltda. Employment Cases [Member] |  |  |  |
Loss Contingency, Number of Plaintiffs | 300 us-gaap_LossContingencyNumberOfPlaintiffs / us-gaap_LitigationCaseAxis = itri_ItronSistemaseTechnologiaLtda.EmploymentCasesMember |  |  |
Itron Sistemas e Technologia Ltda. Employment Cases [Member] | Employees of Previous Service Provider Hired Upon Agreement to Provide Installation and Maintenance Services to a Customer [Member] |  |  |  |
Entity Number of Employees |  |  | 800 dei_EntityNumberOfEmployees / us-gaap_LitigationCaseAxis = itri_ItronSistemaseTechnologiaLtda.EmploymentCasesMember / us-gaap_LossContingenciesByNatureOfContingencyAxis = itri_EmployeesofPreviousServiceProviderHiredUponAgreementtoProvideInstallationandMaintenanceServicestoaCustomerMember |
Itron Sistemas e Technologia Ltda. Employment Cases [Member] | Employees Terminated Upon the Termination of Installation and Maintenance Services Contract with Customer [Member] |  |  |  |
Entity Number of Employees |  |  |  | 870 dei_EntityNumberOfEmployees / us-gaap_LitigationCaseAxis = itri_ItronSistemaseTechnologiaLtda.EmploymentCasesMember / us-gaap_LossContingenciesByNatureOfContingencyAxis = itri_EmployeesTerminatedUpontheTerminationofInstallationandMaintenanceServicesContractwithCustomerMember

X
- Definition Number of persons employed by the Entity + References No definition available. + Details
Name: | dei_EntityNumberOfEmployees
Namespace Prefix: | dei_
Data Type: | xbrli:decimalItemType
Balance Type: | na
Period Type: | instant

X
- Definition Change in product warranty expense compared to prior year. + References No definition available. + Details
Name: | itri_ProductWarrantyExpenseChange
Namespace Prefix: | itri_
Data Type: | xbrli:monetaryItemType
Balance Type: | na
Period Type: | duration

X
- Definition This tag represents specific cases of warranty charges (adjustments) disclosed. This is a subset of the tag itri_WarrantyChangesAndAdjustments, which is defined as "Represents the aggregate Increase or Decrease in the liability during the reporting period for accruals related to preexisting product warranties (including adjustments for changes in estimates)." + References No definition available. + Details
Name: | itri_WarrantyCharge
Namespace Prefix: | itri_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount of judgment or settlement awarded to (against) the entity in respect of litigation. + References No definition available. + Details
Name: | us-gaap_LitigationSettlementAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Number of plaintiffs that have filed claims pertaining to a loss contingency. + References No definition available. + Details
Name: | us-gaap_LossContingencyNumberOfPlaintiffs
Namespace Prefix: | us-gaap_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_LitigationCaseAxis=itri_ItronSistemaseTechnologiaLtda.EmploymentCasesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |