2.4.0.82403408 - Disclosure - Certain Balance Sheet Components Property, Plant, and Equipment, Net (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$1true 3us-gaap_PropertyPlantAndEquipmentLineItemsus-gaap_truenadurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalsexbrli:stringItemTypestringfalse0Property, Plant and Equipment [Line Items]2false 4itri_MachineryAndEquipmentGross1itri_falsedebitinstantfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1truefalsefalse290500000290500USD$falsetruefalse2truefalsefalse287791000287791USD$falsetruefalsexbrli:monetaryItemTypemonetaryAmount before accumulated depreciation of tangible personal property used to produce goods and services, including, but is not limited to, tools, dies and molds, and other machinery and equipment used in the production of goods and services.No definition available.false2Machinery and equipment3false 4itri_ComputersAndSoftwareGrossitri_falsedebitinstantfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1truefalsefalse8818600088186falsefalsefalse2truefalsefalse8498000084980falsefalsefalsexbrli:monetaryItemTypemonetaryAmount before depreciation of computers and software.No definition available.false2Computers and software4false 4itri_BuildingsFurnitureAndImprovementsitri_falsedebitinstantfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1truefalsefalse143420000143420falsefalsefalse2truefalsefalse146191000146191falsefalsefalsexbrli:monetaryItemTypemonetaryAmount before depreciation of building, furniture, and improvements.No definition available.false2Buildings, furniture, and improvements5false 4us-gaap_Landus-gaap_truedebitinstantfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1truefalsefalse2466300024663falsefalsefalse2truefalsefalse2531800025318falsefalsefalsexbrli:monetaryItemTypemonetaryAmount before accumulated depletion of real estate held for productive use, excluding land held for sale.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 4 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=28358313&loc=d3e6812-107765 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 210.5-02.13) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 false2Land6false 4us-gaap_ConstructionInProgressGrossus-gaap_truedebitinstantfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1truefalsefalse3352900033529falsefalsefalse2truefalsefalse2609700026097falsefalsefalsexbrli:monetaryItemTypemonetaryAmount of structure or a modification to a structure under construction. 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