v2.4.1.9

Segment Information Segment results narrative (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Gross profit | $ 154,787 us-gaap_GrossProfit | $ 150,762 us-gaap_GrossProfit | $ 163,041 us-gaap_GrossProfit | $ 154,535 us-gaap_GrossProfit | $ 164,738 us-gaap_GrossProfit | $ 150,084 us-gaap_GrossProfit | $ 159,588 us-gaap_GrossProfit | $ 140,123 us-gaap_GrossProfit | $ 623,125 us-gaap_GrossProfit | $ 614,533 us-gaap_GrossProfit | $ 715,147 us-gaap_GrossProfit
Earnings (loss) per common share - Basic | $ (1.25)us-gaap_EarningsPerShareBasic | $ 0.19 us-gaap_EarningsPerShareBasic | $ 0.49 us-gaap_EarningsPerShareBasic | $ (0.01)us-gaap_EarningsPerShareBasic | $ (3.93)us-gaap_EarningsPerShareBasic | $ (0.19)us-gaap_EarningsPerShareBasic | $ 0.31 us-gaap_EarningsPerShareBasic | $ 0.07 us-gaap_EarningsPerShareBasic | $ (0.58)us-gaap_EarningsPerShareBasic | $ (3.74)us-gaap_EarningsPerShareBasic | $ 2.73 us-gaap_EarningsPerShareBasic
Earnings (loss) per common share - Diluted | $ (1.25)us-gaap_EarningsPerShareDiluted | $ 0.19 us-gaap_EarningsPerShareDiluted | $ 0.49 us-gaap_EarningsPerShareDiluted | $ (0.01)us-gaap_EarningsPerShareDiluted | $ (3.93)us-gaap_EarningsPerShareDiluted | $ (0.19)us-gaap_EarningsPerShareDiluted | $ 0.31 us-gaap_EarningsPerShareDiluted | $ 0.06 us-gaap_EarningsPerShareDiluted | $ (0.58)us-gaap_EarningsPerShareDiluted | $ (3.74)us-gaap_EarningsPerShareDiluted | $ 2.71 us-gaap_EarningsPerShareDiluted
Electricity Operating Segment [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Gross profit |  |  |  |  |  |  |  |  | 208,476 us-gaap_GrossProfit / us-gaap_StatementBusinessSegmentsAxis = itri_ElectricityOperatingSegmentMember | 218,913 us-gaap_GrossProfit / us-gaap_StatementBusinessSegmentsAxis = itri_ElectricityOperatingSegmentMember | 295,005 us-gaap_GrossProfit / us-gaap_StatementBusinessSegmentsAxis = itri_ElectricityOperatingSegmentMember
OpenWay project in North America [Member] | Electricity Operating Segment [Member] | Contracts Accounted for under Percentage of Completion [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Gross profit |  |  |  |  |  |  |  |  | $ 15,900 us-gaap_GrossProfit / us-gaap_ChangeInAccountingEstimateByTypeAxis = us-gaap_ContractsAccountedForUnderPercentageOfCompletionMember / us-gaap_MajorCustomersAxis = itri_OpenWayprojectinNorthAmericaMember / us-gaap_StatementBusinessSegmentsAxis = itri_ElectricityOperatingSegmentMember | $ 16,500 us-gaap_GrossProfit / us-gaap_ChangeInAccountingEstimateByTypeAxis = us-gaap_ContractsAccountedForUnderPercentageOfCompletionMember / us-gaap_MajorCustomersAxis = itri_OpenWayprojectinNorthAmericaMember / us-gaap_StatementBusinessSegmentsAxis = itri_ElectricityOperatingSegmentMember |
Earnings (loss) per common share - Basic |  |  |  |  |  |  |  |  | $ (0.25)us-gaap_EarningsPerShareBasic / us-gaap_ChangeInAccountingEstimateByTypeAxis = us-gaap_ContractsAccountedForUnderPercentageOfCompletionMember / us-gaap_MajorCustomersAxis = itri_OpenWayprojectinNorthAmericaMember / us-gaap_StatementBusinessSegmentsAxis = itri_ElectricityOperatingSegmentMember | $ (0.26)us-gaap_EarningsPerShareBasic / us-gaap_ChangeInAccountingEstimateByTypeAxis = us-gaap_ContractsAccountedForUnderPercentageOfCompletionMember / us-gaap_MajorCustomersAxis = itri_OpenWayprojectinNorthAmericaMember / us-gaap_StatementBusinessSegmentsAxis = itri_ElectricityOperatingSegmentMember |
Earnings (loss) per common share - Diluted |  |  |  |  |  |  |  |  | $ (0.25)us-gaap_EarningsPerShareDiluted / us-gaap_ChangeInAccountingEstimateByTypeAxis = us-gaap_ContractsAccountedForUnderPercentageOfCompletionMember / us-gaap_MajorCustomersAxis = itri_OpenWayprojectinNorthAmericaMember / us-gaap_StatementBusinessSegmentsAxis = itri_ElectricityOperatingSegmentMember | $ (0.26)us-gaap_EarningsPerShareDiluted / us-gaap_ChangeInAccountingEstimateByTypeAxis = us-gaap_ContractsAccountedForUnderPercentageOfCompletionMember / us-gaap_MajorCustomersAxis = itri_OpenWayprojectinNorthAmericaMember / us-gaap_StatementBusinessSegmentsAxis = itri_ElectricityOperatingSegmentMember |

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