v2.4.1.9

Derivative Financial Instruments Derivative Financial Instruments Narrative (Details) (USD $) | 12 Months Ended |  |  |
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Net unrealized loss on hedging instruments | (136,514,000)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax | $ (21,722,000)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax |  |
Long-term Debt | 323,969,000 us-gaap_LongTermDebt |  |  |
Forward Contracts [Member] |  |  |  |
Number of foreign exchange forward contracts entered into YTD | 517 |  |  |
Number of Counterparties [Member] |  |  |  |
Number of foreign exchange forward contracts entered into YTD | Our derivative assets and liabilities consist of foreign exchange forward and interest rate swap contracts with eight counterparties at December 31, 2014 and seven counterparties at December 31, 2013. |  |  |
Interest Rate Swap [Member] | 2011 Credit Facility USD Term Loan Interest Rate Swaps [Member] |  |  |  |
Derivative, Number of Instruments Held | 6 us-gaap_NumberOfInterestRateDerivativesHeld / us-gaap_DerivativeByNatureAxis = itri_A2011CreditFacilityUsdTermLoanInterestRateSwapsMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateSwapMember |  |  |
Pay fixed interest rate in interst rate swap | 1.00%us-gaap_DerivativeFixedInterestRate / us-gaap_DerivativeByNatureAxis = itri_A2011CreditFacilityUsdTermLoanInterestRateSwapsMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateSwapMember |  |  |
Interest Rate Cash Flow Hedge Gain (Loss) to be Reclassified During Next 12 Months, Net | 1,300,000 us-gaap_InterestRateCashFlowHedgeGainLossToBeReclassifiedDuringNext12MonthsNet / us-gaap_DerivativeByNatureAxis = itri_A2011CreditFacilityUsdTermLoanInterestRateSwapsMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateSwapMember |  |  |
Derivative, Notional Amount | 200,000,000 invest_DerivativeNotionalAmount / us-gaap_DerivativeByNatureAxis = itri_A2011CreditFacilityUsdTermLoanInterestRateSwapsMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateSwapMember |  |  |
Secured Debt [Member] |  |  |  |
Long-term Debt | 323,969,000 us-gaap_LongTermDebt / us-gaap_LongtermDebtTypeAxis = us-gaap_SecuredDebtMember | 378,750,000 us-gaap_LongTermDebt / us-gaap_LongtermDebtTypeAxis = us-gaap_SecuredDebtMember |  |
Accumulated Other Comprehensive Income, Net Unrealized Gain (Loss) on Nonderivative Instruments [Member] |  |  |  |
Net unrealized loss on hedging instruments | (14,380,000)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax / us-gaap_StatementEquityComponentsAxis = itri_AccumulatedOtherComprehensiveIncomeNetUnrealizedGainLossOnNonderivativeInstrumentsMember | (14,380,000)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax / us-gaap_StatementEquityComponentsAxis = itri_AccumulatedOtherComprehensiveIncomeNetUnrealizedGainLossOnNonderivativeInstrumentsMember | (14,380,000)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax / us-gaap_StatementEquityComponentsAxis = itri_AccumulatedOtherComprehensiveIncomeNetUnrealizedGainLossOnNonderivativeInstrumentsMember | (14,380,000)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax / us-gaap_StatementEquityComponentsAxis = itri_AccumulatedOtherComprehensiveIncomeNetUnrealizedGainLossOnNonderivativeInstrumentsMember
Accumulated Other Comprehensive Income, Net Unrealized Gain (Loss) on Nonderivative Instruments [Member] | Net Investment Hedging [Member] |  |  |  |
Net unrealized loss on hedging instruments | (14,400,000)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax / us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis = us-gaap_NetInvestmentHedgingMember / us-gaap_StatementEquityComponentsAxis = itri_AccumulatedOtherComprehensiveIncomeNetUnrealizedGainLossOnNonderivativeInstrumentsMember | (14,400,000)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax / us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis = us-gaap_NetInvestmentHedgingMember / us-gaap_StatementEquityComponentsAxis = itri_AccumulatedOtherComprehensiveIncomeNetUnrealizedGainLossOnNonderivativeInstrumentsMember |  |
London Interbank Offered Rate (LIBOR) [Member] | Secured Debt [Member] |  |  |  |
Long-term Debt | 292,500,000 us-gaap_LongTermDebt / itri_InterestRateTypeAxis = us-gaap_LondonInterbankOfferedRateLIBORMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SecuredDebtMember |  |  |
Not Designated as Hedging Instrument [Member] | Foreign Exchange Contract [Member] | Minimum [Member] |  |  |  |
Derivative, Notional Amount | 86,000 invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForeignExchangeContractMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember / us-gaap_RangeAxis = us-gaap_MinimumMember |  |  |
Not Designated as Hedging Instrument [Member] | Foreign Exchange Contract [Member] | Maximum [Member] |  |  |  |
Derivative, Notional Amount | 20,700,000 invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForeignExchangeContractMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember / us-gaap_RangeAxis = us-gaap_MaximumMember |  |  |

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- Definition Aggregate notional amount specified by the derivative(s). Expressed as an absolute value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 13 -Sentence Column B + Details
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- Definition Accumulated change in equity from transactions and other events and circumstances from non-owner sources, net of tax effect, at period end. Excludes Net Income (Loss), and accumulated changes in equity from transactions resulting from investments by owners and distributions to owners. Includes foreign currency translation items, certain pension adjustments, unrealized gains and losses on certain investments in debt and equity securities, other than temporary impairment (OTTI) losses related to factors other than credit losses on available-for-sale and held-to-maturity debt securities that an entity does not intend to sell and it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis, as well as changes in the fair value of derivatives related to the effective portion of a designated cash flow hedge. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=36458714&loc=d3e637-108580 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14 -URI http://asc.fasb.org/extlink&oid=36458714&loc=d3e681-108580 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=36458714&loc=SL7669686-108580 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 31 -Article 5 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 + Details
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- Definition Fixed interest rate related to the interest rate derivative. + References No definition available. + Details
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- Definition Information that would enable users to understand the volume of the entity's derivative activity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1B -URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5580258-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5579245-113959 + Details
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- Definition The estimated net amount of unrealized gains or losses on interest rate cash flow hedges as of the balance sheet date expected to be reclassified to earnings within the next twelve months. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=35736893&loc=d3e80748-113994 + Details
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- Definition Carrying amount of long-term debt, net of unamortized discount or premium, including current and noncurrent amounts. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 7 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.16) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 9 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 20, 22 -Article 5 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.16) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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- Definition Number of interest rate derivative instruments held by the entity at the reporting date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1B -URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5580258-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5579245-113959 + Details
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