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Summary of Intangible Asset Account Activity (Details) - USD ($) $ in Thousands | 6 Months Ended
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Jun. 30, 2022 | Jun. 30, 2021
Total Intangible Assets [Abstract] |  |
Intangible assets, gross beginning balance | $ 928,422 | $ 1,000,037
Effect of change in exchange rates | (22,306) | (9,082)
Intangible assets, gross ending balance | 906,116 | 990,955
Intangible liabilities, gross beginning balance | 23,900 | 23,900
Effect of change in exchange rates | 0 | 0
Intangible liabilities, gross ending balance | $ 23,900 | $ 23,900

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- Definition Finite-Lived Intangible Liabilities, Foreign Currency Translation Gain Loss + References No definition available. + Details
Name: | itri_FiniteLivedIntangibleLiabilitiesForeignCurrencyTranslationGainLoss
Namespace Prefix: | itri_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Finite-lived intangible liabilities, Gross + References No definition available. + Details
Name: | itri_FinitelivedintangibleliabilitiesGross
Namespace Prefix: | itri_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Total Intangible Assets [Abstract] + References No definition available. + Details
Name: | itri_TotalIntangibleAssetsAbstract
Namespace Prefix: | itri_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Amount of foreign currency translation gain (loss) which increases (decreases) assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References No definition available. + Details
Name: | us-gaap_FiniteLivedIntangibleAssetsForeignCurrencyTranslationGainLoss
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Amount before accumulated amortization of intangible assets, excluding goodwill. + References No definition available. + Details
Name: | us-gaap_IntangibleAssetsGrossExcludingGoodwill
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant