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Summary of Intangible Asset Account Activity (Details) - USD ($) $ in Thousands | 6 Months Ended
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Jun. 30, 2019 | Jun. 30, 2018
Total Intangible Assets [Abstract] |  |
Beginning balance, intangible assets, gross | $ 981,160 | $ 769,851
Finite-lived Intangible Assets Acquired | 0 | 241,539
Effect of change in exchange rates | 4,349 | (18,883)
Ending balance, intangible assets, gross | 985,509 | 992,507
Beginning balance, intangible liabilities, gross | (23,900) | 0
Customer contract and relationships | 0 | (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 Acquired + References No definition available. + Details
Name: | itri_FiniteLivedIntangibleLiabilitiesAcquired
Namespace Prefix: | itri_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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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
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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 of increase in assets, excluding financial assets, lacking physical substance with a definite life, from an acquisition. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16265-109275 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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