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Summary of Intangible Asset Account Activity (Details) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2020 | Mar. 31, 2019
Total Intangible Assets [Abstract] |  |
Beginning balance, intangible assets, gross | $ 979,814 | $ 981,160
Effect of change in exchange rates | (16,075) | 2,359
Ending balance, intangible assets, gross | 963,739 | 983,519
Beginning balance, intangible liabilities, gross | (23,900) | (23,900)
Effect of change in exchange rates | 0 | 0
Ending balance, intangible liabilities, gross | $ (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