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Earnings Per Share and Capital Stock 2 (Details) - USD ($)
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Capital stock      
Undistributed Earnings (Loss) Allocated to Participating Securities, Basic   $ (145,000) $ (173,000)
Additional disclosure      
Common Shares issued under DRP and the 2000 and 2008 Employee Plans 56,498 56,900 53,612
Value of Common Shares issued under DRP and the 2000 and 2008 Employee Plans     $ 1,198,000
Dividend Reinvestment Plan Common Stock Capital Shares Reserved for Future Issuance 1,055,948    
Common Shares authorized for issuance but unissued under 401(k) Plan 387,300    
Common Shares issued as a result of the exercise of stock options 52,936 12,546 66,458
Proceeds from Stock Options Exercised, Distributed to Subsidiaries $ 0 $ 0 $ 0
GSWC      
Additional disclosure      
Value of Common Shares issued under DRP and the 2000 and 2008 Employee Plans   501,000  
Common Stock [Member]      
Additional disclosure      
Common Shares issued under DRP and the 2000 and 2008 Employee Plans     120,000
Value of Common Shares issued under DRP and the 2000 and 2008 Employee Plans     $ 1,198,000
Common Shares repurchased in the open market under DRP and 401(k) Plan     1,905,000
Common Stock [Member] | GSWC      
Additional disclosure      
Value of Common Shares issued under DRP and the 2000 and 2008 Employee Plans   $ 501,000  
2014 and 2015 Stock Repurchase Programs [Member] | AWR      
Additional disclosure      
Common Shares repurchased in the open market under DRP and 401(k) Plan     1,905,000
Stock Repurchase Program, Number of Shares Authorized to be Repurchased     2,450,000.00