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Earnings Per Share and Capital Stock (Details 2) - USD ($)
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
May. 19, 2015
Capital stock        
Undistributed Earnings (Loss) Allocated to Participating Securities, Basic   $ (157,000) $ (191,000)  
Additional disclosure        
Common Shares issued under DRP and the 2000 and 2008 Employee Plans 53,612 74,145 114,821  
Value of Common Shares issued under DRP and the 2000 and 2008 Employee Plans     $ 2,111,000  
Common Shares authorized for issuance but unissued under DRP 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 66,458 37,006 131,448  
Proceeds from Stock Options Exercised, Distributed to Subsidiaries $ 0      
GSWC        
Additional disclosure        
Value of Common Shares issued under DRP and the 2000 and 2008 Employee Plans   $ 514,000    
Common Stock [Member]        
Additional disclosure        
Common Shares issued under DRP and the 2000 and 2008 Employee Plans     247,000  
Value of Common Shares issued under DRP and the 2000 and 2008 Employee Plans     $ 2,111,000  
Common Shares repurchased in the open market under DRP and 401(k) Plan 1,905,000 545,000    
Common Stock [Member] | GSWC        
Additional disclosure        
Value of Common Shares issued under DRP and the 2000 and 2008 Employee Plans   $ 514,000    
2014 and 2015 Stock Repurchase Programs [Member] | AWR        
Additional disclosure        
Common Shares repurchased in the open market under DRP and 401(k) Plan 1,905,000 545,000    
Stock Repurchase Program, Number of Shares Authorized to be Repurchased       2,450,000.00