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Summary of Intangible Asset Account Activity (Details) - USD ($) $ in Thousands | 9 Months Ended
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Sep. 30, 2020 | Sep. 30, 2019
Total Intangible Assets [Abstract] |  |
Intangible Assets, gross beginning balance | $ 979,814 | $ 981,160
Intangibles disposed in sale of business | (18,140) | 0
Effect of change in exchange rates | 9,974 | (15,574)
Intangible Assets, gross ending balance | 971,648 | 965,586
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 Assets, Disposed In Sale of Business + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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- Definition Finite-Lived Intangible Liabilities, Foreign Currency Translation Gain Loss + References No definition available. + Details
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Namespace Prefix: | itri_
Data Type: | xbrli:monetaryItemType
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- Definition Finite-lived intangible liabilities, Gross + References No definition available. + Details
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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
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Data Type: | xbrli:stringItemType
Balance Type: | na
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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
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
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- Definition Amount before accumulated amortization of intangible assets, excluding goodwill. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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