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Revenue Recognition Revenue Contract Assets and Liabilities Rollforward (Details) $ in Thousands | 6 Months Ended
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Jun. 30, 2019 USD ($)
Revenue Recognition and Deferred Revenue [Abstract] |
Beginning balance, January 1 | $ 102,130
Revenues recognized from beginning contract liability | (41,873)
Increases due to amounts collected or due | 184,808
Revenues recognized from current period increases | (129,074)
Other | (9,053)
Ending balance, June 30 | $ 106,938

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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130551-203045 + Details
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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 8 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130549-203045 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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