v2.4.1.9

Commitments and Contingencies Warranty Expense (Details) (USD $) | 12 Months Ended
--- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Warranty charge | $ 4,000,000 itri_WarrantyCharge |  |
Warranty Expense | 10,170,000 itri_WarrantyExpense | 15,904,000 itri_WarrantyExpense | 13,186,000 itri_WarrantyExpense
Product Warranty Expense, Change | $ 5,700,000 itri_ProductWarrantyExpenseChange | $ 2,700,000 itri_ProductWarrantyExpenseChange |

X
- Definition Change in product warranty expense compared to prior year. + References No definition available. + Details
Name: | itri_ProductWarrantyExpenseChange
Namespace Prefix: | itri_
Data Type: | xbrli:monetaryItemType
Balance Type: | na
Period Type: | duration

X
- Definition This tag represents specific cases of warranty charges (adjustments) disclosed. This is a subset of the tag itri_WarrantyChangesAndAdjustments, which is defined as "Represents the aggregate Increase or Decrease in the liability during the reporting period for accruals related to preexisting product warranties (including adjustments for changes in estimates)." + References No definition available. + Details
Name: | itri_WarrantyCharge
Namespace Prefix: | itri_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The expense (credit) charged against earnings for the period pertaining to warranties on the entity's goods and services granted to customers. + References No definition available. + Details
Name: | itri_WarrantyExpense
Namespace Prefix: | itri_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration