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Defined Contribution, Bonus, and Profit Sharing Plans - Schedule of Bonus and Profit Sharing Plans Expense (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Defined Contribution, Bonus, and Profit Sharing [Abstract] |  |  |
Bonus and profit sharing plans and award expense | $ 15,466 | $ 40,005 | $ 43,377

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- Definition Expense recognized in the period related to bonus and profit sharing plans and other awards for employee achievement. + References No definition available. + Details
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Namespace Prefix: | itri_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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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