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Summary of Intangible Asset Account Activity (Details) - USD ($) $ in Thousands | 9 Months Ended |
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Dec. 31, 2017
Total Intangible Assets [Abstract] |  |  |
Beginning balance, intangible assets, gross | $ 769,851 | $ 669,896 |
Finite-lived Intangible Assets Acquired | 242,039 | 36,500 |
Effect of change in exchange rates | (15,352) | 57,640 |
Ending balance, intangible assets, gross | 996,538 | 764,036 |
Beginning balance, intangible liabilities, gross | 0 | 0 |
Customer contract and relationships | (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: | instant

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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_
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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
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- Definition Total Intangible Assets [Abstract] + References No definition available. + Details
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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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- 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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- 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
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