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Restructuring Restructuring Additional Information (Details) (USD $)
3 Months Ended 15 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Dec. 31, 2014
Restructuring Cost and Reserve [Line Items]      
Restructuring Reserve, Current $ 40,700,000us-gaap_RestructuringReserveCurrent   $ 49,100,000us-gaap_RestructuringReserveCurrent
Restructuring Reserve, Noncurrent 6,900,000us-gaap_RestructuringReserveNoncurrent   13,800,000us-gaap_RestructuringReserveNoncurrent
Restructuring Charges (5,447,000)us-gaap_RestructuringCharges 5,524,000us-gaap_RestructuringCharges  
2014 Project [Member]      
Restructuring Cost and Reserve [Line Items]      
Change in Total Expected Restructuring Costs 6,900,000itri_ChangeinTotalExpectedRestructuringCosts
/ us-gaap_RestructuringPlanAxis
= itri_A2014ProjectMember
   
Restructuring Charges (5,447,000)us-gaap_RestructuringCharges
/ us-gaap_RestructuringPlanAxis
= itri_A2014ProjectMember
   
2013 Project [Member]      
Restructuring Cost and Reserve [Line Items]      
Restructuring Charges     $ 26,200,000us-gaap_RestructuringCharges
/ us-gaap_RestructuringPlanAxis
= itri_A2013ProjectMember