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Business Segments (Details)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2020
USD ($)
Sep. 30, 2020
USD ($)
Jun. 30, 2020
USD ($)
Mar. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Sep. 30, 2019
USD ($)
Jun. 30, 2019
USD ($)
Mar. 31, 2019
USD ($)
Dec. 31, 2020
USD ($)
segment
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Details of reportable segment                      
Operating revenues $ 124,200 $ 133,688 $ 121,278 $ 109,077 $ 112,993 $ 134,496 $ 124,647 $ 101,733 $ 488,243 $ 473,869 $ 436,816
Operating Income 29,277 39,807 35,716 25,699 24,724 42,724 39,430 20,195 130,499 127,073 100,983
Interest expense, net                 (20,730) (21,337) (19,855)
Net utility plant 1,512,043       1,415,705       1,512,043 1,415,705 1,296,310
Depreciation and amortization expense                 36,850 35,397 40,425
Income Tax Expense (Benefit)                 28,197 24,670 18,017
Capital additions                 $ 130,423 151,940 126,561
Parent Company                      
Details of reportable segment                      
Number of reportable segments | segment                 3    
Operating revenues                 $ 0 0 0
Operating Income                 (9) (9) 7
Interest expense, net                 (330) (539) (451)
Net utility plant 0       0       0 0 0
Depreciation and amortization expense                 0 0 0
Income Tax Expense (Benefit)                 (208) (709) (525)
Capital additions                 $ 0 0 0
GSWC                      
Details of reportable segment                      
Number of reportable segments | segment                 1    
Operating revenues 73,438 98,701 94,753 82,392 81,233 107,245 95,548 75,352 $ 349,284 359,378 329,608
Operating Income 17,480 $ 33,149 $ 30,175 $ 22,092 18,746 $ 36,982 $ 34,037 $ 15,327 102,896 105,092 80,562
Net utility plant 1,400,489       1,394,742       1,400,489 1,394,742  
Depreciation and amortization expense                 32,184 32,441 38,395
Income Tax Expense (Benefit)                 21,704 20,177 13,603
GSWC | Water Service Utility Operations [Member]                      
Details of reportable segment                      
Operating revenues                 330,637 319,830 295,258
Operating Income                 97,896 93,895 74,342
Interest expense, net                 (20,312) (20,304) (18,403)
Net utility plant 1,400,489       1,322,062       1,400,489 1,322,062 1,218,468
Depreciation and amortization expense                 30,969 29,956 36,137
Income Tax Expense (Benefit)                 20,515 17,295 12,391
Capital additions                 107,355 131,353 110,934
GSWC | Electric:                      
Details of reportable segment                      
Operating revenues                   39,548 34,350
Operating Income                   11,197 6,220
Interest expense, net                   (1,228) (1,328)
Net utility plant         72,680         72,680 62,624
Depreciation and amortization expense                   2,485 2,258
Income Tax Expense (Benefit)                   2,882 1,212
Capital additions                   11,499 5,420
American States Utility Services [Member] | Contracted services:                      
Details of reportable segment                      
Operating revenues                 120,582 114,491 107,208
Operating Income                 22,309 21,990 20,414
Interest expense, net                 496 734 327
Net utility plant 22,246       $ 20,963       22,246 20,963 15,218
Depreciation and amortization expense                 3,402 2,956 2,030
Income Tax Expense (Benefit)                 5,201 5,202 4,939
Capital additions                 $ 4,675 9,088 $ 10,207
Period of Fixed Price Contracts to Operate and Maintain Water Systems at Various Military Bases                 50 years    
Bear Valley Electric Service, Inc. | Electric:                      
Details of reportable segment                      
Operating revenues                 $ 37,024    
Operating Income                 10,303    
Interest expense, net                 (584)    
Net utility plant $ 89,308               89,308    
Depreciation and amortization expense                 2,479    
Income Tax Expense (Benefit)                   $ 2,689  
Capital additions                 $ 18,393