2.4.0.82407404 - Disclosure - Derivative Financial Instruments Offsetting of Derivative Liabilities (Details)truefalseIn Thousands, unless otherwise specifiedfalse1false USDfalsefalse$I2013Q2http://www.sec.gov/CIK0000780571instant2013-06-30T00:00:000001-01-01T00:00:00usdStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$2false USDfalsefalse$I2012Q4http://www.sec.gov/CIK0000780571instant2012-12-31T00:00:000001-01-01T00:00:00usdStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$1true 3us-gaap_OffsettingLiabilitiesLineItemsus-gaap_truenadurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalsexbrli:stringItemTypestringfalse0Offsetting Liabilities [Line Items]2false 4us-gaap_DerivativeFairValueOfDerivativeLiabilityus-gaap_truecreditinstantfalsefalsefalsefalsefalsefalsefalsefalseverboseLabel1truefalsefalse15900001590USD$falsetruefalse2truefalsefalse28390002839USD$falsetruefalsexbrli:monetaryItemTypemonetaryFair value before effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=28370219&loc=SL20226000-175313 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=20225523&loc=SL20225862-175312 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4B -Subparagraph (a),(c) -URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5624163-113959 false2Gross Amounts of Recognized Liabilities Presented in the Consolidated Balance Sheets3false 4itri_DerivativeLiabilityFairValueGrossAssetsNotOffsetitri_falsedebitinstantfalsefalsefalsefalsefalsefalsefalsetruenegatedTerseLabel1truefalsefalse-122000-122falsefalsefalse2truefalsefalse-135000-135falsefalsefalsexbrli:monetaryItemTypemonetaryDerivative assets, for which management has made an accounting policy election not to offset or which do not meet the criteria for offsetting, subject to enforceable master netting arrangements or similar agreements but which have not been offset against derivative liabilities for net presentation on the balance sheet.No definition available.false2Derivative Financial Instruments Not Offset in the Consolidated Balance Sheets4false 4us-gaap_DerivativeCollateralRightToReclaimCashus-gaap_truedebitinstantfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1truefalsefalse00falsefalsefalse2truefalsefalse00falsefalsefalsexbrli:monetaryItemTypemonetaryAmount of right to receive cash collateral under master netting arrangements that have not been offset against derivative liabilities.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=28370219&loc=SL20226016-175313 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (d)(2) -URI http://asc.fasb.org/extlink&oid=20225523&loc=SL20225862-175312 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 8 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=7476318&loc=d3e41678-113959 false2Cash Collateral Pledged Not Offset in the Consolidated Balance Sheets5false 4us-gaap_DerivativeFairValueOfDerivativeLiabilityAmountOffsetAgainstCollateralus-gaap_truecreditinstantfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1truefalsefalse14680001468USD$falsetruefalse2truefalsefalse27040002704USD$falsetruefalsexbrli:monetaryItemTypemonetaryFair value of financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset offset against the right to receive collateral. 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