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Business Segments (Details)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
USD ($)
segment
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Details of reportable segment      
Operating revenues $ 436,087 $ 458,641 $ 465,791
Operating income (loss) 114,716 118,489 119,045
Interest expense, net (21,235) (20,630) (20,690)
Utility Plant 1,150,926 1,060,794 1,003,520
Depreciation and amortization expense [1] 38,850 42,033 41,073
Income tax expense/(benefit) 34,735 37,731 38,048
Capital additions $ 129,867 87,323 72,553
GSWC      
Details of reportable segment      
Number of reportable segments | segment 2    
Operating revenues $ 338,702 364,550 361,059
Operating income (loss) 95,819 100,409 99,742
Utility Plant 1,145,311 1,056,116  
Depreciation and amortization expense 37,804 40,893 39,854
Income tax expense/(benefit) 28,609 32,472 32,006
GSWC | Water      
Details of reportable segment      
Operating revenues 302,931 328,511 326,672
Operating income (loss) 87,911 94,213 94,014
Interest expense, net (19,696) (19,468) (19,370)
Utility Plant 1,089,031 1,005,114 953,678
Depreciation and amortization expense [1] 35,777 39,190 38,388
Income tax expense/(benefit) 25,894 30,302 30,410
Capital additions 120,850 77,440 66,304
GSWC | Electric      
Details of reportable segment      
Operating revenues 35,771 36,039 34,387
Operating income (loss) 7,908 6,196 5,728
Interest expense, net (1,337) (1,090) (1,260)
Utility Plant 56,280 51,002 45,202
Depreciation and amortization expense [1] 2,027 1,703 1,466
Income tax expense/(benefit) 2,715 2,170 1,596
Capital additions 7,063 8,704 4,584
American States Utility Services [Member] | Military Utility Privatization Subsidiaries      
Details of reportable segment      
Operating revenues 97,385 94,091 104,732
Operating income (loss) 18,916 18,091 19,351
Interest expense, net (68) (26) (142)
Utility Plant 5,615 4,678 4,640
Depreciation and amortization expense [1] 1,046 1,140 1,219
Income tax expense/(benefit) 6,672 6,069 7,038
Capital additions $ 1,954 1,179 1,665
AWR Parent      
Details of reportable segment      
Number of reportable segments | segment 3    
Operating revenues $ 0 0 0
Operating income (loss) (19) (11) (48)
Interest expense, net (134) (46) 82
Utility Plant 0 0 0
Depreciation and amortization expense [1] 0 0 0
Income tax expense/(benefit) (546) (810) (996)
Capital additions $ 0 $ 0 $ 0
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