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Defined Contribution, Bonus, and Profit Sharing Plans - Narrative (Details) | 12 Months Ended
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Dec. 31, 2018
Defined Contribution, Bonus, and Profit Sharing [Abstract] |
Employer matching contribution, percentage of match | 75.00%
Employer matching contribution, percentage of employees' gross pay | 6.00%

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- Definition Defined Contribution, Bonus, and Profit Sharing [Abstract] + References No definition available. + Details
Name: | itri_DefinedContributionBonusAndProfitSharingAbstract
Namespace Prefix: | itri_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- 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

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- Definition Percentage employer matches of the employee's percentage contribution matched. + References No definition available. + Details
Name: | us-gaap_DefinedContributionPlanEmployerMatchingContributionPercentOfMatch
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration