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Business Segments (Details) $ in Thousands | 12 Months Ended
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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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