v2.3.0.15

Segment Information Major Customers (Details)	3 Months Ended		9 Months Ended
	Sep. 30, 2011 customers	Sep. 30, 2010 customers	Sep. 30, 2011 contracts customers	Sep. 30, 2010 customers
Revenue, Major Customer [Line Items]
Major Customers Percentage Revenue Threshold	10.00%	10.00%	10.00%	10.00%
Number Of Major Customers	0	1	0	1
Itron North America [Member]
Revenue, Major Customer [Line Items]
Major Customers Percentage Revenue Threshold	10.00%	10.00%	10.00%	10.00%
Number Of Major Customers	3	3	2	3
Itron International [Member]
Revenue, Major Customer [Line Items]
Major Customers Percentage Revenue Threshold	10.00%	10.00%	10.00%	10.00%
Number Of Major Customers	0	0	0	0

X

- Definition

Represents number of customers with revenues greater than 10% of total company and/or segment revenues for the periods presented.

+ Details

Name:	itri_NumberOfMajorCustomers
Namespace Prefix:	itri
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Percentage represents the concentration risk threshold for customer revenues as a percent of total company revenues and/or total segment revenues. Customer with revenues greater than this percentage threshold of total company revenues and/or segment revenues must be stated.

+ Details

Name:	itri_PercentageOfRevenuesByMajorCustomers
Namespace Prefix:	itri
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ Details

Name:	us-gaap_EntityWideRevenueMajorCustomerLineItems
Namespace Prefix:	us-gaap
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration