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Summary of Intangible Asset Account Activity (Details) - USD ($) $ in Thousands | 6 Months Ended
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Jun. 30, 2018 | Jun. 30, 2017
Total Intangible Assets [Abstract] |  |
Beginning balance, intangible assets, gross | $ 769,851 | $ 669,896
Finite-lived Intangible Assets Acquired | 241,539 | 36,500
Effect of change in exchange rates | (18,883) | 40,818
Ending balance, intangible assets, gross | 992,507 | 747,214
Beginning balance, intangible liabilities, gross | 0 | 0
Intangible liabilities acquired | (23,900) | 0
Effect of change in exchange rates | 0 | 0
Ending balance, intangible liabilities, gross | $ (23,900) | $ 0

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- Definition Finite-Lived Intangible Liabilities Acquired + References No definition available. + Details
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Namespace Prefix: | itri_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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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
Balance Type: | credit
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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
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
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
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- Definition Amount of increase in assets, excluding financial assets, lacking physical substance with a definite life, from an acquisition. + 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
Period Type: | instant