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Defined Contribution, Bonus, and Profit Sharing Plans - Schedule of Defined Contribution Plans Expense (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Defined Contribution, Bonus, and Profit Sharing [Abstract] |  |  |
Defined contribution plans expense | $ 17,882 | $ 11,593 | $ 11,709

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- Definition Defined Contribution, Bonus, and Profit Sharing [Abstract] + References No definition available. + Details
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Namespace Prefix: | itri_
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Balance Type: | na
Period Type: | duration

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- Definition Amount of cost for defined contribution plan. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 70 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=49170846&loc=d3e28014-114942 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration