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v2.4.1.9

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

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