v2.4.1.9

Segment Information Property, Plant, and Equipment By Location (Details) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013
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Revenues from External Customers and Long-Lived Assets [Line Items] |  |
Property, plant, and equipment, net | $ 207,789 us-gaap_PropertyPlantAndEquipmentNet | $ 246,820 us-gaap_PropertyPlantAndEquipmentNet
UNITED STATES |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |
Property, plant, and equipment, net | 76,130 us-gaap_PropertyPlantAndEquipmentNet / us-gaap_StatementGeographicalAxis = country_US | 87,954 us-gaap_PropertyPlantAndEquipmentNet / us-gaap_StatementGeographicalAxis = country_US
Outside United States [Member] |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |
Property, plant, and equipment, net | $ 131,659 us-gaap_PropertyPlantAndEquipmentNet / us-gaap_StatementGeographicalAxis = itri_OutsideUnitedStatesMember | $ 158,866 us-gaap_PropertyPlantAndEquipmentNet / us-gaap_StatementGeographicalAxis = itri_OutsideUnitedStatesMember

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- Definition Amount after accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business to produce goods and services and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 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 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 13 -Subparagraph a -Article 5 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 8 -Article 7 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |