v2.4.1.9

Restructuring Restructuring Additional Information (Details) (USD $) | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Restructuring Cost and Reserve [Line Items] |  |  |
Costs incurred and charged to expense | $ 50,857,000 us-gaap_RestructuringCharges | $ 35,497,000 us-gaap_RestructuringCharges | $ 1,665,000 us-gaap_RestructuringCharges
Restructuring Reserve, Current | 49,100,000 us-gaap_RestructuringReserveCurrent | 30,300,000 us-gaap_RestructuringReserveCurrent |
Restructuring Reserve, Noncurrent | 13,800,000 us-gaap_RestructuringReserveNoncurrent | 6,000,000 us-gaap_RestructuringReserveNoncurrent |
Asset Impairment and Net (Gain) Loss on Sale or Disposal [Member] |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Costs incurred and charged to expense | 5,220,000 us-gaap_RestructuringCharges / us-gaap_RestructuringCostAndReserveAxis = itri_AssetImpairmentAndNetGainLossOnSaleOrDisposalMember |  |
2013 Project [Member] |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Costs incurred and charged to expense | (4,943,000)us-gaap_RestructuringCharges / us-gaap_RestructuringPlanAxis = itri_A2013ProjectMember | 31,100,000 us-gaap_RestructuringCharges / us-gaap_RestructuringPlanAxis = itri_A2013ProjectMember |
2013 Project [Member] | Asset Impairment and Net (Gain) Loss on Sale or Disposal [Member] |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Costs incurred and charged to expense | (2,732,000)us-gaap_RestructuringCharges / us-gaap_RestructuringCostAndReserveAxis = itri_AssetImpairmentAndNetGainLossOnSaleOrDisposalMember / us-gaap_RestructuringPlanAxis = itri_A2013ProjectMember |  |
2014 Project [Member] |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Costs incurred and charged to expense | 55,800,000 us-gaap_RestructuringCharges / us-gaap_RestructuringPlanAxis = itri_A2014ProjectMember |  |
2014 Project [Member] | Asset Impairment and Net (Gain) Loss on Sale or Disposal [Member] |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Costs incurred and charged to expense | 7,952,000 us-gaap_RestructuringCharges / us-gaap_RestructuringCostAndReserveAxis = itri_AssetImpairmentAndNetGainLossOnSaleOrDisposalMember / us-gaap_RestructuringPlanAxis = itri_A2014ProjectMember |  |
Land, Buildings and Improvements [Member] | 2014 Project [Member] | Asset Impairment and Net (Gain) Loss on Sale or Disposal [Member] |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Costs incurred and charged to expense | 3,000,000 us-gaap_RestructuringCharges / us-gaap_ImpairedLongLivedAssetsHeldAndUsedByTypeAxis = us-gaap_LandBuildingsAndImprovementsMember / us-gaap_RestructuringCostAndReserveAxis = itri_AssetImpairmentAndNetGainLossOnSaleOrDisposalMember / us-gaap_RestructuringPlanAxis = itri_A2014ProjectMember |  |
Machinery and Equipment [Member] | 2014 Project [Member] | Asset Impairment and Net (Gain) Loss on Sale or Disposal [Member] |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Costs incurred and charged to expense | 4,600,000 us-gaap_RestructuringCharges / us-gaap_ImpairedLongLivedAssetsHeldAndUsedByTypeAxis = us-gaap_MachineryAndEquipmentMember / us-gaap_RestructuringCostAndReserveAxis = itri_AssetImpairmentAndNetGainLossOnSaleOrDisposalMember / us-gaap_RestructuringPlanAxis = itri_A2014ProjectMember |  |
Property, Plant and Equipment, Other Types [Member] | 2014 Project [Member] | Asset Impairment and Net (Gain) Loss on Sale or Disposal [Member] |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Costs incurred and charged to expense | $ 400,000 us-gaap_RestructuringCharges / us-gaap_ImpairedLongLivedAssetsHeldAndUsedByTypeAxis = us-gaap_PropertyPlantAndEquipmentOtherTypesMember / us-gaap_RestructuringCostAndReserveAxis = itri_AssetImpairmentAndNetGainLossOnSaleOrDisposalMember / us-gaap_RestructuringPlanAxis = itri_A2014ProjectMember |  |

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- Definition Amount of expenses associated with exit or disposal activities pursuant to an authorized plan. Excludes expenses related to a discontinued operation or an asset retirement obligation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB TOPIC 5.P.4(b)) -URI http://asc.fasb.org/extlink&oid=27011515&loc=d3e140904-122747 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 5.P.3) -URI http://asc.fasb.org/extlink&oid=27011515&loc=d3e140864-122747 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 5 -Section P -Subsection 3, 4 + Details
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