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Business Segments: (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Dec. 31, 2013
Details of reportable segment      
Operating revenues $ 101,945 $ 110,552  
Operating income (loss) 22,768 27,963  
Interest expense, net 5,515 5,591  
Utility Plant 983,929 929,538 981,477
Depreciation and amortization expense 10,530 9,816  
Income tax expense (benefit) 6,357 9,249  
Capital additions 20,531 18,425  
GSWC
      
Details of reportable segment      
Number of reportable segments 2    
Operating revenues 81,213 79,967  
Operating income (loss) 20,430 23,596  
Utility Plant 979,297   977,294
Depreciation and amortization expense 10,240 9,522  
Income tax expense (benefit) 5,705 7,663  
AWR Parent
      
Details of reportable segment      
Number of reportable segments 3    
Reportable Entities | GSWC | Water
      
Details of reportable segment      
Operating revenues 70,757 69,233  
Operating income (loss) 18,395 21,763  
Interest expense, net 5,168 5,194  
Utility Plant 938,744 883,863  
Depreciation and amortization expense 9,563 8,930  
Income tax expense (benefit) 4,958 6,941  
Capital additions 19,324 17,878  
Reportable Entities | GSWC | Electric
      
Details of reportable segment      
Operating revenues 10,456 10,734  
Operating income (loss) 2,035 1,833  
Interest expense, net 334 376  
Utility Plant 40,553 40,963  
Depreciation and amortization expense 677 592  
Income tax expense (benefit) 747 722  
Capital additions 472 233  
Reportable Entities | ASUS | Contracts
      
Details of reportable segment      
Operating revenues 20,732 30,585  
Operating income (loss) 2,384 4,367  
Interest expense, net 67 60  
Utility Plant 4,632 4,712  
Depreciation and amortization expense 290 294  
Income tax expense (benefit) 823 1,666  
Capital additions 735 314  
Intersegment Eliminations | AWR Parent
      
Details of reportable segment      
Operating revenues 0 0  
Operating income (loss) (46) 0  
Interest expense, net (54) (39)  
Utility Plant 0 0  
Depreciation and amortization expense 0 0  
Income tax expense (benefit) (171) (80)  
Capital additions $ 0 $ 0