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Revenue Recognition Revenue Contract Assets and Liabilities Rollforward (Details) $ in Thousands | 3 Months Ended
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Mar. 31, 2020 USD ($)
Revenue Recognition and Deferred Revenue [Abstract] |
Beginning balance, January 1, 2020 | $ 88,215
Revenues recognized from beginning contract liability | (57,077)
Increases due to amounts collected or due | 112,394
Revenues recognized from current period increases | (45,304)
Other | (999)
Ending balance, March 31, 2020 | $ 97,229

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- Definition Contract with Customer, Liability, Revenue Recognized From Current Period + 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 Contract with Customer, Other adjustments + 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 Contract with Customer, net + 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 Amount of decrease in right to consideration in exchange for good or service transferred to customer when right is conditioned on something other than passage of time from transfer to receivable due to right to consideration becoming unconditional. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130551-203045 + Details
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Period Type: | duration

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- Definition Amount of revenue recognized that was previously included in balance of obligation to transfer good or service to customer for which consideration from customer has been received or is due. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 8 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130549-203045 + Details
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Namespace Prefix: | us-gaap_
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Period Type: | duration

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- References No definition available. + Details
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Balance Type: | na
Period Type: | duration