Carrying amount as of the balance sheet date, which is the cumulative amount paid and (if applicable) the fair value of any noncontrolling interest in the acquiree, adjusted for any amortization recognized prior to the adoption of any changes in generally accepted accounting principles (as applicable) and for any impairment charges, in excess of the fair value of net assets acquired in one or more business combination transactions.

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+ Details

- Definition

Loss recognized during the period that results from the write-down of goodwill after comparing the implied fair value of reporting unit goodwill with the carrying amount of that goodwill. Goodwill is assessed at least annually for impairment.

+ References

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+ Details

Goodwill Schedule of Goodwill Impairment (Details) (USD $) In Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010	Dec. 31, 2010	Dec. 31, 2009
Goodwill [Line Items]
Goodwill Impairment	$ 540,400	$ 0	$ 540,400	$ 0
Goodwill, After Estimated Impairment	714,606	1,236,583	714,606	1,236,583	1,209,376	1,305,599
Itron International Electricity [Member]
Goodwill [Line Items]
Goodwill, Before Estimated Impairment	363,626		363,626
Goodwill Impairment			216,085
Goodwill, After Estimated Impairment	147,541		147,541
Itron International Water [Member]
Goodwill [Line Items]
Goodwill, Before Estimated Impairment	389,308		389,308
Goodwill Impairment			324,315
Goodwill, After Estimated Impairment	$ 64,993		$ 64,993