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Utility Plant and Intangible Assets (Details) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Utility plant utilized in continuing operations by major asset class      
Total utility plant, at cost $ 1,527,537 $ 1,455,416  
Less - accumulated depreciation (529,698) (500,239)  
Construction work in progress 62,955 48,343  
Net utility plant 1,060,794 1,003,520 $ 981,477
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      
Utility plant utilized in continuing operations by major asset class      
Total utility plant, at cost 1,439,056 1,373,780  
Water | Land      
Utility plant utilized in continuing operations by major asset class      
Total utility plant, at cost 15,299 15,423  
Water | Intangible Assets [Member]      
Utility plant utilized in continuing operations by major asset class      
Total utility plant, at cost 34,848 34,081  
Water | Source of water supply      
Utility plant utilized in continuing operations by major asset class      
Total utility plant, at cost 86,914 80,614  
Water | Pumping      
Utility plant utilized in continuing operations by major asset class      
Total utility plant, at cost 161,668 155,802  
Water | Water treatment      
Utility plant utilized in continuing operations by major asset class      
Total utility plant, at cost 72,238 71,519  
Water | Transmission and distribution      
Utility plant utilized in continuing operations by major asset class      
Total utility plant, at cost 941,651 894,789  
Water | General      
Utility plant utilized in continuing operations by major asset class      
Total utility plant, at cost 126,438 121,552  
Electric      
Utility plant utilized in continuing operations by major asset class      
Total utility plant, at cost 88,481 81,636  
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 66,121 60,035  
Electric | Generation      
Utility plant utilized in continuing operations by major asset class      
Total utility plant, at cost 12,563 12,547  
Electric | General      
Utility plant utilized in continuing operations by major asset class      
Total utility plant, at cost [1] 9,797 9,054  
GSWC      
Utility plant utilized in continuing operations by major asset class      
Total utility plant, at cost 1,516,505 1,444,710  
Less - accumulated depreciation (522,749) (494,000)  
Construction work in progress 62,360 48,170  
Net utility plant 1,056,116 998,880  
GSWC | Water      
Utility plant utilized in continuing operations by major asset class      
Total utility plant, at cost 1,428,024 1,363,074  
Net utility plant 1,005,114 953,678 936,386
GSWC | Water | Land      
Utility plant utilized in continuing operations by major asset class      
Total utility plant, at cost 15,299 15,423  
GSWC | Water | Intangible Assets [Member]      
Utility plant utilized in continuing operations by major asset class      
Total utility plant, at cost 34,830 34,063  
GSWC | Water | Source of water supply      
Utility plant utilized in continuing operations by major asset class      
Total utility plant, at cost 86,914 80,614  
GSWC | Water | Pumping      
Utility plant utilized in continuing operations by major asset class      
Total utility plant, at cost 161,668 155,802  
GSWC | Water | Water treatment      
Utility plant utilized in continuing operations by major asset class      
Total utility plant, at cost 72,238 71,519  
GSWC | Water | Transmission and distribution      
Utility plant utilized in continuing operations by major asset class      
Total utility plant, at cost 941,651 894,789  
GSWC | Water | General      
Utility plant utilized in continuing operations by major asset class      
Total utility plant, at cost 115,424 110,864  
GSWC | Electric      
Utility plant utilized in continuing operations by major asset class      
Total utility plant, at cost 88,481 81,636  
Net utility plant 51,002 45,202 $ 40,908
GSWC | Electric | Transmission and distribution      
Utility plant utilized in continuing operations by major asset class      
Total utility plant, at cost 66,121 60,035  
GSWC | Electric | Generation      
Utility plant utilized in continuing operations by major asset class      
Total utility plant, at cost 12,563 12,547  
GSWC | Electric | General      
Utility plant utilized in continuing operations by major asset class      
Total utility plant, at cost [1] $ 9,797 $ 9,054  
[1] Includes intangible assets of $1.2 million for the years ended December 31, 2015 and 2014 for studies performed in association with the electricity segment of the Registrant’s operations.