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Commitments and Contingencies Warranty Expense (Details) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2021 | Mar. 31, 2020
Commitments and Contingencies Disclosure [Abstract] |  |
Total warranty expense | $ 3,075 | $ 1,763

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- Definition Product Warranty Expense (Benefit) + References No definition available. + Details
Name: | itri_ProductWarrantyExpenseBenefit
Namespace Prefix: | itri_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- References No definition available. + Details
Name: | us-gaap_CommitmentsAndContingenciesDisclosureAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration