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Credit Facility Additional Information (Details) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2018
Jan. 05, 2018
Dec. 31, 2017
Jun. 23, 2015
Debt Instrument [Line Items]        
Debt instrument, face amount   $ 1,200,000   $ 725,000
Line of credit facility, maximum borrowing capacity   500,000    
Swingline sub-facility [Member]        
Debt Instrument [Line Items]        
Line of credit facility, maximum borrowing capacity   50,000    
Line of credit facility, amount outstanding $ 0      
USD Denominated Term Loan [Member]        
Debt Instrument [Line Items]        
Debt instrument, face amount   $ 650,000    
Line of Credit [Member]        
Debt Instrument [Line Items]        
Line of credit facility, amount outstanding 10,000   $ 125,414  
Line of credit facility, remaining borrowing capacity 448,892   $ 342,705  
Standby Letters of Credit [Member]        
Debt Instrument [Line Items]        
Line of credit facility, maximum borrowing capacity $ 300,000      
Secured Debt [Member]        
Debt Instrument [Line Items]        
Debt instrument, collateral All obligations under the 2018 credit facility are guaranteed by Itron, Inc. and material U.S. domestic subsidiaries and are secured by a pledge of substantially all of the assets of Itron, Inc. and material U.S. domestic subsidiaries, including a pledge of their related assets. This includes a pledge of 100% of the capital stock of material U.S. domestic subsidiaries and up to 66% of the voting stock (100% of the non-voting stock) of first-tier foreign subsidiaries. In addition, the obligations of any foreign subsidiary who is a foreign borrower, as defined by the 2018 credit facility, are guaranteed by the foreign subsidiary and by its direct and indirect foreign parents.      
Minimum [Member]        
Debt Instrument [Line Items]        
Line of credit facility, unused capacity, commitment fee percentage 0.18%      
Maximum [Member]        
Debt Instrument [Line Items]        
Line of credit facility, unused capacity, commitment fee percentage 0.35%      
London Interbank Offered Rate (LIBOR) [Member]        
Debt Instrument [Line Items]        
Debt instrument, description of variable rate basis the LIBOR rate      
Debt instrument, basis spread on variable rate 2.00%      
Applicable interest rate 4.25%      
EURIBOR [Member]        
Debt Instrument [Line Items]        
Debt instrument, description of variable rate basis EURIBOR rate      
Alternate base rate (1) [Member]        
Debt Instrument [Line Items]        
Debt instrument, description of variable rate basis the prime rate      
Alternate base rate (2) [Member]        
Debt Instrument [Line Items]        
Debt instrument, description of variable rate basis the Federal Reserve effective rate      
Debt instrument, basis spread on variable rate 0.50%      
Alternate base rate (3) [Member]        
Debt Instrument [Line Items]        
Debt instrument, description of variable rate basis one-month LIBOR      
Debt instrument, basis spread on variable rate 1.00%      
Alternate base rate [Member]        
Debt Instrument [Line Items]        
Debt instrument, description of variable rate basis Alternate Base Rate