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Summary of Significant Accounting Policies Basis of Consolidation Policy Additional Information (Details)
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12 Months Ended |
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Dec. 31, 2014
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| Maximum [Member] | |
| Basis of Consolidation [Abstract] | |
| Ownership Interest To Use Equity Method | 50.00%itri_OwnershipInterestToUseEquityMethod / us-gaap_RangeAxis = us-gaap_MaximumMember |
| Ownership Interest To Use Cost Method | 20.00%itri_OwnershipInterestToUseCostMethod / us-gaap_RangeAxis = us-gaap_MaximumMember |
| Minimum [Member] | |
| Basis of Consolidation [Abstract] | |
| Ownership Interest to be Held for Consolidation | 50.00%itri_OwnershipInterestToBeHeldForConsolidation / us-gaap_RangeAxis = us-gaap_MinimumMember |
| Noncontrolling Interests [Abstract] | |
| Ownership Interest to be Held for Consolidation | 50.00%itri_OwnershipInterestToBeHeldForConsolidation / us-gaap_RangeAxis = us-gaap_MinimumMember |
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- Details
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- Definition
Ownership Interest to be Held for Consolidation No definition available.
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- Definition
Entities in which the company has less than 20% investment and where they do not excercise significant influence are accounted for under the cost method. No definition available.
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- Definition
The equity method of accounting is used for entities in which the company has a 50% or less invesment and exercises significant influence. No definition available.
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- Details
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- Details
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- Details
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