v2.4.1.9
Income Taxes Schedule of Deferred Tax Assets and Liabilities (Details) (USD $)
Dec. 31, 2014
Dec. 31, 2013
Deferred Tax Assets, Tax Credit Carryforwards, Foreign $ 75,400,000us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsForeign  
Tax Credit Carryforward, Valuation Allowance 58,500,000us-gaap_TaxCreditCarryforwardValuationAllowance  
Deferred tax assets    
Loss carryforwards(1) 188,607,000us-gaap_DeferredTaxAssetsOperatingLossCarryforwards [1] 174,360,000us-gaap_DeferredTaxAssetsOperatingLossCarryforwards
Tax Credit Carryforward, Amount 81,903,000us-gaap_TaxCreditCarryforwardAmount [2] 16,073,000us-gaap_TaxCreditCarryforwardAmount
Accrued expenses 54,393,000us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAccruedLiabilities 40,593,000us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAccruedLiabilities
Depreciation and amortization 19,111,000itri_DeferredTaxAssetsDepreciationAndAmortization 16,770,000itri_DeferredTaxAssetsDepreciationAndAmortization
Warranty reserves 19,141,000us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsWarrantyReserves 16,704,000us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsWarrantyReserves
Pension plan benefits expense 19,679,000us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsPensions 13,464,000us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsPensions
Equity compensation 10,039,000us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost 9,908,000us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost
Inventory valuation 4,420,000us-gaap_DeferredTaxAssetsInventory 2,942,000us-gaap_DeferredTaxAssetsInventory
Other deferred tax assets, net 8,968,000us-gaap_DeferredTaxAssetsOther 9,858,000us-gaap_DeferredTaxAssetsOther
Total deferred tax assets 406,261,000us-gaap_DeferredTaxAssetsGross 300,672,000us-gaap_DeferredTaxAssetsGross
Valuation allowance (256,619,000)us-gaap_DeferredTaxAssetsValuationAllowance (161,026,000)us-gaap_DeferredTaxAssetsValuationAllowance
Total deferred tax assets, net of valuation allowance 149,642,000us-gaap_DeferredTaxAssetsNet 139,646,000us-gaap_DeferredTaxAssetsNet
Deferred tax liabilities    
Depreciation and amortization 37,061,000itri_DeferredTaxLiabilitiesDepreciationAndAmortization 50,606,000itri_DeferredTaxLiabilitiesDepreciationAndAmortization
Tax effect of accumulated translation (568,000)us-gaap_DeferredTaxLiabilitiesOtherComprehensiveIncome (1,551,000)us-gaap_DeferredTaxLiabilitiesOtherComprehensiveIncome
Other deferred tax liabilities, net (2,299,000)us-gaap_DeferredTaxLiabilitiesOther (2,883,000)us-gaap_DeferredTaxLiabilitiesOther
Total deferred tax liabilities 39,928,000us-gaap_DeferredTaxLiabilities 55,040,000us-gaap_DeferredTaxLiabilities
Net deferred tax assets 109,714,000us-gaap_DeferredTaxAssetsLiabilitiesNet 84,606,000us-gaap_DeferredTaxAssetsLiabilitiesNet
Deferred Tax Assets, Tax Credit Carryforwards, General Business 18,200,000us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsGeneralBusiness  
Deferred Tax Assets, Tax Credit Carryforwards, Alternative Minimum Tax 2,500,000us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsAlternativeMinimumTax  
U.S. federal    
Deferred tax assets    
Loss carryforwards(1) 19,800,000us-gaap_OperatingLossCarryforwards
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_InternalRevenueServiceIRSMember		 [1]  
LUXEMBOURG    
Deferred tax assets    
Loss carryforwards(1) $ 441,300,000us-gaap_OperatingLossCarryforwards
/ us-gaap_IncomeTaxAuthorityAxis
= country_LU		 [1]  
[1] For tax return purposes at December 31, 2014, we had U.S. federal loss carryforwards of $19.8 million that expire during the years 2020 and 2021. At December 31, 2014, we have net operating loss carryforwards in Luxembourg of $441.3 million that can be carried forward indefinitely, offset by a full valuation allowance. The remaining portion of the loss carryforwards are composed primarily of losses in various other foreign jurisdictions. The majority of these losses can be carried forward indefinitely. At December 31, 2014, there was a valuation allowance of $256.6 million primarily associated with foreign loss carryforwards and foreign tax credit carryforwards (discussed below).
[2] For tax return purposes at December 31, 2014, we had: (1) U.S. general business credits of $18.2 million, which begin to expire in 2022; (2) U.S. alternative minimum tax credits of $2.5 million that can be carried forward indefinitely; and (3) U.S. foreign tax credits of $75.4 million, which begin to expire in 2019. At December 31, 2014, there was a valuation allowance of $58.5 million associated with foreign tax credit carryforward.