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Utility Plant and Intangible Assets (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Utility plant utilized in continuing operations by major asset class      
Total amortized intangible assets $ 30,822 $ 31,192  
Total utility plant, at cost 1,780,110 1,674,527  
Less - accumulated depreciation (561,855) (533,370)  
Construction work in progress (78,055) (63,835)  
Net utility plant 1,296,310 1,204,992 $ 1,150,926
American States Utility Services [Member] | 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 1,674,046 1,574,801  
Water Service Utility Operations [Member] | Land      
Utility plant utilized in continuing operations by major asset class      
Total utility plant, at cost 14,890 14,895  
Water Service Utility Operations [Member] | Intangible Assets [Member]      
Utility plant utilized in continuing operations by major asset class      
Total utility plant, at cost 29,412 29,396  
Water Service Utility Operations [Member] | Source of water supply      
Utility plant utilized in continuing operations by major asset class      
Total utility plant, at cost 91,349 88,168  
Water Service Utility Operations [Member] | Pumping      
Utility plant utilized in continuing operations by major asset class      
Total utility plant, at cost 182,673 178,252  
Water Service Utility Operations [Member] | Water treatment      
Utility plant utilized in continuing operations by major asset class      
Total utility plant, at cost 82,198 78,999  
Water Service Utility Operations [Member] | Transmission and distribution      
Utility plant utilized in continuing operations by major asset class      
Total utility plant, at cost 1,142,105 1,064,271  
Water Service Utility Operations [Member] | General      
Utility plant utilized in continuing operations by major asset class      
Total utility plant, at cost 131,419 120,820  
Electric Service Utility Operations [Member]      
Utility plant utilized in continuing operations by major asset class      
Total utility plant, at cost 106,064 99,726  
Electric Service Utility Operations [Member] | Intangible Assets [Member]      
Utility plant utilized in continuing operations by major asset class      
Total utility plant, at cost 1,200 1,200  
Electric Service Utility Operations [Member] | Transmission and distribution      
Utility plant utilized in continuing operations by major asset class      
Total utility plant, at cost 82,257 76,188  
Electric Service Utility Operations [Member] | Generation      
Utility plant utilized in continuing operations by major asset class      
Total utility plant, at cost 12,583 12,583  
Electric Service Utility Operations [Member] | General      
Utility plant utilized in continuing operations by major asset class      
Total utility plant, at cost 11,224 10,955  
GSWC      
Utility plant utilized in continuing operations by major asset class      
Total amortized intangible assets 30,251 30,621  
Total utility plant, at cost 1,755,599 1,658,935  
Less - accumulated depreciation (551,244) (524,481)  
Construction work in progress (76,737) (63,486)  
Net utility plant 1,281,092 1,197,940  
GSWC | Water Service Utility Operations [Member]      
Utility plant utilized in continuing operations by major asset class      
Total utility plant, at cost 1,649,535 1,559,209  
Net utility plant 1,218,468 1,137,995 1,089,031
GSWC | Water Service Utility Operations [Member] | Land      
Utility plant utilized in continuing operations by major asset class      
Total utility plant, at cost 14,890 14,895  
GSWC | Water Service Utility Operations [Member] | Intangible Assets [Member]      
Utility plant utilized in continuing operations by major asset class      
Total utility plant, at cost 29,413 29,378  
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 91,349 88,168  
GSWC | Water Service Utility Operations [Member] | Pumping      
Utility plant utilized in continuing operations by major asset class      
Total utility plant, at cost 182,673 178,252  
GSWC | Water Service Utility Operations [Member] | Water treatment      
Utility plant utilized in continuing operations by major asset class      
Total utility plant, at cost 82,198 78,999  
GSWC | Water Service Utility Operations [Member] | Transmission and distribution      
Utility plant utilized in continuing operations by major asset class      
Total utility plant, at cost 1,142,105 1,064,271  
GSWC | Water Service Utility Operations [Member] | General      
Utility plant utilized in continuing operations by major asset class      
Total utility plant, at cost 106,907 105,246  
GSWC | Electric Service Utility Operations [Member]      
Utility plant utilized in continuing operations by major asset class      
Total utility plant, at cost 106,064 99,726  
Net utility plant 62,624 59,945 $ 56,280
GSWC | Electric Service Utility Operations [Member] | Transmission and distribution      
Utility plant utilized in continuing operations by major asset class      
Total utility plant, at cost 82,257 76,188  
GSWC | Electric Service Utility Operations [Member] | Generation      
Utility plant utilized in continuing operations by major asset class      
Total utility plant, at cost 12,583 12,583  
GSWC | Electric Service Utility Operations [Member] | General      
Utility plant utilized in continuing operations by major asset class      
Total utility plant, at cost 11,224 10,955  
Conservation [Member]      
Utility plant utilized in continuing operations by major asset class      
Total amortized intangible assets 9,486 9,486  
Conservation [Member] | GSWC      
Utility plant utilized in continuing operations by major asset class      
Total amortized intangible assets $ 9,486 $ 9,486