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Debt Schedule of Debt (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Debt Instrument [Line Items]    
Current portion of debt $ 30,000us-gaap_LongTermDebtCurrent $ 30,000us-gaap_LongTermDebtCurrent
Long-term debt 331,310us-gaap_LongTermDebtNoncurrent 293,969us-gaap_LongTermDebtNoncurrent
Secured Debt [Member]    
Debt Instrument [Line Items]    
Total debt 361,310us-gaap_LongTermDebt
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SecuredDebtMember
323,969us-gaap_LongTermDebt
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SecuredDebtMember
Current portion of debt 30,000us-gaap_LongTermDebtCurrent
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SecuredDebtMember
30,000us-gaap_LongTermDebtCurrent
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SecuredDebtMember
Long-term debt 331,310us-gaap_LongTermDebtNoncurrent
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SecuredDebtMember
293,969us-gaap_LongTermDebtNoncurrent
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SecuredDebtMember
USD Denominated Term Loan
   
Debt Instrument [Line Items]    
USD denominated term loan 225,000us-gaap_LoansPayableToBank
/ us-gaap_LongtermDebtTypeAxis
= itri_UsdDenominatedTermLoanMember
232,500us-gaap_LoansPayableToBank
/ us-gaap_LongtermDebtTypeAxis
= itri_UsdDenominatedTermLoanMember
Multicurrency revolving line of credit    
Debt Instrument [Line Items]    
Multicurrency revolving line of credit   $ 91,469us-gaap_LineOfCredit
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_RevolvingCreditFacilityMember