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Defined Contribution Bonus and Profit Sharing Plans Schedule of Bonus and Profit Sharing Plans Expense (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Bonus and Profit Sharing Plans and Awards Expense | $ 43,377 | $ 14,192 | $ 34,989

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- Definition Expense recognized in the period related to bonus and profit sharing plans and other awards for employee achievement. + References No definition available. + Details
Name: | itri_BonusAndProfitSharingPlansAndAwardsExpense
Namespace Prefix: | itri_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration