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Debt Schedule of Long-Term Debt Repayments (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Debt Instrument [Line Items]    
Repayments of Long-term Debt $ 22,373us-gaap_RepaymentsOfLongTermDebt $ 30,625us-gaap_RepaymentsOfLongTermDebt
Secured Debt [Member]    
Debt Instrument [Line Items]    
Repayments of Long-term Debt 22,373us-gaap_RepaymentsOfLongTermDebt
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SecuredDebtMember		 30,625us-gaap_RepaymentsOfLongTermDebt
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SecuredDebtMember
Term loan    
Debt Instrument [Line Items]    
Repayments of Long-term Debt 7,500us-gaap_RepaymentsOfLongTermDebt
/ us-gaap_LongtermDebtTypeAxis
= itri_UsdDenominatedTermLoanMember		 5,625us-gaap_RepaymentsOfLongTermDebt
/ us-gaap_LongtermDebtTypeAxis
= itri_UsdDenominatedTermLoanMember
Multicurrency revolving line of credit    
Debt Instrument [Line Items]    
Repayments of Long-term Debt $ 14,873us-gaap_RepaymentsOfLongTermDebt
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_RevolvingCreditFacilityMember		 $ 25,000us-gaap_RepaymentsOfLongTermDebt
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_RevolvingCreditFacilityMember