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Business Segments (Details)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
USD ($)
segment
Dec. 31, 2014
USD ($)
Dec. 31, 2013
USD ($)
Details of reportable segment      
Operating revenues $ 458,641 $ 465,791 $ 472,077
Operating income (loss) 118,489 119,045 119,072
Interest expense, net (20,630) (20,690) (21,708)
Utility Plant 1,060,794 1,003,520 981,477
Depreciation and amortization expense [1] 42,033 41,073 40,090
Income tax expense/(benefit) 37,731 38,048 35,783
Capital additions $ 87,323 72,553 97,379
GSWC      
Details of reportable segment      
Number of reportable segments | segment 2    
Operating revenues $ 364,550 361,059 358,540
Operating income (loss) 100,409 99,742 102,343
Utility Plant 1,056,116 998,880  
Depreciation and amortization expense 40,893 39,854 38,952
Income tax expense/(benefit) 32,472 32,006 33,134
GSWC | Water      
Details of reportable segment      
Operating revenues 328,511 326,672 320,131
Operating income (loss) 94,213 94,014 95,932
Interest expense, net (19,468) (19,370) (20,236)
Utility Plant 1,005,114 953,678 936,386
Depreciation and amortization expense [1] 39,190 38,388 36,636
Income tax expense/(benefit) 30,302 30,410 30,679
Capital additions 77,440 66,304 94,581
GSWC | Electric      
Details of reportable segment      
Operating revenues 36,039 34,387 38,409
Operating income (loss) 6,196 5,728 6,411
Interest expense, net (1,090) (1,260) (1,436)
Utility Plant 51,002 45,202 40,908
Depreciation and amortization expense [1] 1,703 1,466 2,316
Income tax expense/(benefit) 2,170 1,596 2,455
Capital additions 8,704 4,584 2,124
American States Utility Services [Member] | Military Utility Privatization Subsidiaries      
Details of reportable segment      
Operating revenues 94,091 104,732 113,537
Operating income (loss) 18,091 19,351 16,737
Interest expense, net (26) (142) (264)
Utility Plant 4,678 4,640 4,183
Depreciation and amortization expense [1] 1,140 1,219 1,138
Income tax expense/(benefit) 6,069 7,038 4,911
Capital additions $ 1,179 1,665 674
AWR Parent      
Details of reportable segment      
Number of reportable segments | segment 3    
Operating revenues $ 0 0 0
Operating income (loss) (11) (48) (8)
Interest expense, net (46) 82 228
Utility Plant 0 0 0
Depreciation and amortization expense [1] 0 0 0
Income tax expense/(benefit) (810) (996) (2,262)
Capital additions $ 0 $ 0 $ 0
[1] Depreciation computed on GSWC’s transportation equipment is recorded in other operating expenses and totaled $641,000, $678,000 and $877,000 for the years ended December 31, 2015, 2014 and 2013, respectively.