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Utility Plant and Intangible Assets (Details) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Utility plant utilized in continuing operations by major asset class      
Total utility plant, at cost $ 2,052,353 $ 1,930,224  
Less — accumulated depreciation (594,264) (568,326)  
Construction work in progress 167,915 150,145  
Net utility plant 1,626,004 1,512,043 $ 1,415,705
American States Utility Services | Intangible Assets [Member]      
Utility plant utilized in continuing operations by major asset class      
Total utility plant, at cost 571 571  
Water Service Utility Operations [Member]      
Utility plant utilized in continuing operations by major asset class      
Total utility plant, at cost 1,935,881 1,817,717  
Water Service Utility Operations [Member] | Land      
Utility plant utilized in continuing operations by major asset class      
Total utility plant, at cost 18,207 18,234  
Water Service Utility Operations [Member] | Intangible Assets [Member]      
Utility plant utilized in continuing operations by major asset class      
Total utility plant, at cost 29,028 28,906  
Water Service Utility Operations [Member] | Source of water supply      
Utility plant utilized in continuing operations by major asset class      
Total utility plant, at cost 98,244 92,166  
Water Service Utility Operations [Member] | Pumping      
Utility plant utilized in continuing operations by major asset class      
Total utility plant, at cost 209,936 190,901  
Water Service Utility Operations [Member] | Water treatment      
Utility plant utilized in continuing operations by major asset class      
Total utility plant, at cost 83,922 81,272  
Water Service Utility Operations [Member] | Transmission and distribution      
Utility plant utilized in continuing operations by major asset class      
Total utility plant, at cost 1,356,649 1,277,361  
Water Service Utility Operations [Member] | General      
Utility plant utilized in continuing operations by major asset class      
Total utility plant, at cost 139,895 128,877  
Electric:      
Utility plant utilized in continuing operations by major asset class      
Total utility plant, at cost 116,472 112,507  
Electric: | Intangible Assets [Member]      
Utility plant utilized in continuing operations by major asset class      
Total utility plant, at cost 1,200 1,200  
Electric: | Transmission and distribution      
Utility plant utilized in continuing operations by major asset class      
Total utility plant, at cost 90,491 87,461  
Electric: | Generation      
Utility plant utilized in continuing operations by major asset class      
Total utility plant, at cost 12,583 12,583  
Electric: | General      
Utility plant utilized in continuing operations by major asset class      
Total utility plant, at cost [1] 13,398 12,463  
GSWC      
Utility plant utilized in continuing operations by major asset class      
Less — accumulated depreciation (522,672) (502,283)  
Construction work in progress 123,600 118,370  
Net utility plant 1,499,745 1,400,489  
GSWC | Water Service Utility Operations [Member]      
Utility plant utilized in continuing operations by major asset class      
Total utility plant, at cost 1,898,817 1,784,402  
Net utility plant 1,499,745 1,400,489 1,322,062
GSWC | Water Service Utility Operations [Member] | Land      
Utility plant utilized in continuing operations by major asset class      
Total utility plant, at cost 18,207 18,234  
GSWC | Water Service Utility Operations [Member] | Intangible Assets [Member]      
Utility plant utilized in continuing operations by major asset class      
Total utility plant, at cost 29,028 28,906  
GSWC | Water Service Utility Operations [Member] | Source of water supply      
Utility plant utilized in continuing operations by major asset class      
Total utility plant, at cost 98,244 92,166  
GSWC | Water Service Utility Operations [Member] | Pumping      
Utility plant utilized in continuing operations by major asset class      
Total utility plant, at cost 209,936 190,901  
GSWC | Water Service Utility Operations [Member] | Water treatment      
Utility plant utilized in continuing operations by major asset class      
Total utility plant, at cost 83,922 81,272  
GSWC | Water Service Utility Operations [Member] | Transmission and distribution      
Utility plant utilized in continuing operations by major asset class      
Total utility plant, at cost 1,356,649 1,277,361  
GSWC | Water Service Utility Operations [Member] | General      
Utility plant utilized in continuing operations by major asset class      
Total utility plant, at cost 102,831 95,562  
GSWC | Electric:      
Utility plant utilized in continuing operations by major asset class      
Total utility plant, at cost 0 0  
Net utility plant   89,308 $ 72,680
GSWC | Electric: | Transmission and distribution      
Utility plant utilized in continuing operations by major asset class      
Total utility plant, at cost 0 0  
GSWC | Electric: | Generation      
Utility plant utilized in continuing operations by major asset class      
Total utility plant, at cost 0 0  
GSWC | Electric: | General      
Utility plant utilized in continuing operations by major asset class      
Total utility plant, at cost [1] $ 0 $ 0  
[1]      Includes intangible assets of $1.2 million for the years ended December 31, 2021 and 2020 for studies performed in association with the electric segment.