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Summary of Significant Accounting Policies - Restructuring (Details) | 12 Months Ended
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Dec. 31, 2018
Accounting Policies [Abstract] |
Remaining service period of terminated employees | 60 days

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- Definition Restructuring Costs, Employee Termination, Required Service Period + References No definition available. + Details
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Namespace Prefix: | itri_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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