v2.4.0.6
Document and Entity Information (USD $)
12 Months Ended
Dec. 31, 2011
Jan. 31, 2012
Jun. 30, 2011
Document and Entity Information [Line Items]      
Document Type 10-K    
Amendment Flag false    
Document Period End Date Dec. 31, 2011    
Entity Registrant Name ITRON INC /WA/    
Entity Central Index Key 0000780571    
Document Fiscal Year Focus 2011    
Document Fiscal Period Focus FY    
Current Fiscal Year End Date --12-31    
Entity Filer Category Large Accelerated Filer    
Entity Common Stock, Shares Outstanding   39,826,906  
Entity Well-known Seasoned Issuer Yes    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Trading Symbol ITRI    
Entity Public Float     $ 1,957,036,021