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Earnings Per Share and Capital Stock (Details 2) (USD $)
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Mar. 27, 2014
Capital stock        
Undistributed Earnings (Loss) Allocated to Participating Securities, Basic   $ (191,000)us-gaap_UndistributedEarningsLossAllocatedToParticipatingSecuritiesBasic $ (210,000)us-gaap_UndistributedEarningsLossAllocatedToParticipatingSecuritiesBasic  
Additional disclosure        
Common Shares issued under DRP and the 2000 and 2008 Employee Plans 74,145us-gaap_StockIssuedDuringPeriodSharesNewIssues 114,821us-gaap_StockIssuedDuringPeriodSharesNewIssues 77,038us-gaap_StockIssuedDuringPeriodSharesNewIssues  
Value of Common Shares issued under DRP and the 2000 and 2008 Employee Plans     13,295,000us-gaap_StockIssuedDuringPeriodValueNewIssues  
Common Shares authorized for issuance but unissued under DRP 1,055,948awr_DividendReinvestmentPlanCommonStockCapitalSharesReservedForFutureIssuance      
Common Shares authorized for issuance but unissued under 401(k) Plan 387,300awr_DefinedContributionPlanCommonStockCapitalSharesReservedForFutureIssuance      
Common Shares issued as a result of the exercise of stock options 37,006us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised 131,448us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised 819,400us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised  
Proceeds from Stock Options Exercised, Distributed to Subsidiaries 0awr_ProceedsfromStockOptionsExercisedDistributedtoSubsidiaries      
Amount available for issuance of securities under registration statement 115,000,000awr_AmountAvailableForIssuanceOfSecuritiesUnderRegistrationStatement      
AWR        
Additional disclosure        
Stock Repurchase Program, Number of Shares Authorized to be Repurchased       1,250,000.00us-gaap_StockRepurchaseProgramNumberOfSharesAuthorizedToBeRepurchased
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
GSWC        
Additional disclosure        
Value of Common Shares issued under DRP and the 2000 and 2008 Employee Plans   943,000us-gaap_StockIssuedDuringPeriodValueNewIssues
/ dei_LegalEntityAxis
= awr_GoldenStateWaterCompanyMember		    
Common Stock [Member]        
Additional disclosure        
Common Shares issued under DRP and the 2000 and 2008 Employee Plans     896,000us-gaap_StockIssuedDuringPeriodSharesNewIssues
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember		  
Value of Common Shares issued under DRP and the 2000 and 2008 Employee Plans     13,295,000us-gaap_StockIssuedDuringPeriodValueNewIssues
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember		  
Common Shares repurchased in the open market under DRP and 401(k) Plan 545,000us-gaap_StockRepurchasedDuringPeriodShares
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember		      
Common Stock [Member] | GSWC        
Additional disclosure        
Value of Common Shares issued under DRP and the 2000 and 2008 Employee Plans   $ 943,000us-gaap_StockIssuedDuringPeriodValueNewIssues
/ dei_LegalEntityAxis
= awr_GoldenStateWaterCompanyMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember		    
AWR        
Additional disclosure        
Common Shares repurchased in the open market under DRP and 401(k) Plan 545,000us-gaap_StockRepurchasedDuringPeriodShares
/ us-gaap_ShareRepurchaseProgramAxis
= us-gaap_ParentCompanyMember