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Business Segments (Details)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2019
USD ($)
Sep. 30, 2019
USD ($)
Jun. 30, 2019
USD ($)
Mar. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Sep. 30, 2018
USD ($)
Jun. 30, 2018
USD ($)
Mar. 31, 2018
USD ($)
Dec. 31, 2019
USD ($)
segment
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Details of reportable segment                      
Operating revenues $ 112,993 $ 134,496 $ 124,647 $ 101,733 $ 111,005 $ 124,182 $ 106,901 $ 94,728 $ 473,869 $ 436,816 $ 440,603
Operating Income 24,724 42,724 39,430 20,195 22,749 33,975 25,568 18,691 127,073 100,983 127,095
Interest expense, net                 (21,337) (19,855) (20,792)
Net utility plant 1,415,705       1,296,310       1,415,705 1,296,310 1,204,992
Depreciation and amortization expense [1]                 35,397 40,425 39,031
Income Tax Expense (Benefit)                 24,670 18,017 38,974
Capital additions                 $ 151,940 126,561 113,126
Parent Company                      
Details of reportable segment                      
Number of reportable segments | segment                 3    
Operating revenues                 $ 0 0 0
Operating Income                 (9) 7 (96)
Interest expense, net                 (539) (451) (248)
Net utility plant 0       0       0 0 0
Depreciation and amortization expense [1]                 0 0 0
Income Tax Expense (Benefit)                 (709) (525) (2,221)
Capital additions                 $ 0 0 0
GSWC                      
Details of reportable segment                      
Number of reportable segments | segment                 2    
Operating revenues 81,233 107,245 95,548 75,352 75,226 95,564 84,574 74,244 $ 359,378 329,608 340,301
Operating Income 18,746 $ 36,982 $ 34,037 $ 15,327 14,080 $ 27,540 $ 22,645 $ 16,297 105,092 80,562 105,871
Net utility plant 1,394,742       1,281,092       1,394,742 1,281,092  
Depreciation and amortization expense                 32,441 38,395 37,852
Income Tax Expense (Benefit)                 20,177 13,603 34,059
GSWC | Water Service Utility Operations [Member]                      
Details of reportable segment                      
Operating revenues                 319,830 295,258 306,332
Operating Income                 93,895 74,342 98,678
Interest expense, net                 (20,304) (18,403) (18,909)
Net utility plant 1,322,062       1,218,468       1,322,062 1,218,468 1,137,995
Depreciation and amortization expense [1]                 29,956 36,137 35,706
Income Tax Expense (Benefit)                 17,295 12,391 32,212
Capital additions                 131,353 110,934 104,546
GSWC | Electric:                      
Details of reportable segment                      
Operating revenues                 39,548 34,350 33,969
Operating Income                 11,197 6,220 7,193
Interest expense, net                 (1,228) (1,328) (1,380)
Net utility plant 72,680       62,624       72,680 62,624 59,945
Depreciation and amortization expense [1]                 2,485 2,258 2,146
Income Tax Expense (Benefit)                 2,882 1,212 1,847
Capital additions                 11,499 5,420 5,941
American States Utility Services [Member] | Contracted services:                      
Details of reportable segment                      
Operating revenues                 114,491 107,208 100,302
Operating Income                 21,990 20,414 21,320
Interest expense, net                 734 327 (255)
Net utility plant $ 20,963       $ 15,218       20,963 15,218 7,052
Depreciation and amortization expense [1]                 2,956 2,030 1,179
Income Tax Expense (Benefit)                 5,202 4,939 7,136
Capital additions                 $ 9,088 $ 10,207 $ 2,639
Period of Fixed Price Contracts to Operate and Maintain Water Systems at Various Military Bases                 50 years    
[1]