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Stock-Based Compensation Plans (Details) (USD $) In Thousands, except Share data, unless otherwise specified | 12 Months Ended | 3 Months Ended
--- | --- | ---
Dec. 31, 2014 stock_plan | Dec. 31, 2013 | Dec. 31, 2012 | Mar. 31, 2013 | Mar. 31, 2012
Stock compensation plans |  |  |  |  |
Number of stock incentive plans | 4 awr_NumberOfStockIncentivePlans |  |  |  |
Stock-based compensation recognized in the income statement, before taxes | $ 2,222 us-gaap_AllocatedShareBasedCompensationExpense | $ 2,009 us-gaap_AllocatedShareBasedCompensationExpense | $ 1,931 us-gaap_AllocatedShareBasedCompensationExpense |  |
Immediate vesting for employees of certain age and above | 55 years |  |  |  |
GSWC |  |  |  |  |
Stock compensation plans |  |  |  |  |
Stock-based compensation recognized in the income statement, before taxes | 1,748 us-gaap_AllocatedShareBasedCompensationExpense / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember | 1,647 us-gaap_AllocatedShareBasedCompensationExpense / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember | 1,667 us-gaap_AllocatedShareBasedCompensationExpense / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember |  |
Capitalized equity-based compensation cost | 255 us-gaap_EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsCapitalizedAmount / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember | 334 us-gaap_EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsCapitalizedAmount / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember | 259 us-gaap_EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsCapitalizedAmount / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember |  |
Nonqualified stock options |  |  |  |  |
Stock compensation plans |  |  |  |  |
Granted (in shares) | 0 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember |  |  | 0 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember | 0 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember
Nonqualified stock options | Employees and directors |  |  |  |  |
Stock compensation plans |  |  |  |  |
Stock-based compensation recognized in the income statement, before taxes | 0 us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember / us-gaap_TitleOfIndividualAxis = awr_EmployeesAndDirectorMember | 9 us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember / us-gaap_TitleOfIndividualAxis = awr_EmployeesAndDirectorMember | 150 us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember / us-gaap_TitleOfIndividualAxis = awr_EmployeesAndDirectorMember |  |
Nonqualified stock options | Employees and directors | GSWC |  |  |  |  |
Stock compensation plans |  |  |  |  |
Stock-based compensation recognized in the income statement, before taxes | 0 us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember / us-gaap_TitleOfIndividualAxis = awr_EmployeesAndDirectorMember | 8 us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember / us-gaap_TitleOfIndividualAxis = awr_EmployeesAndDirectorMember | 147 us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember / us-gaap_TitleOfIndividualAxis = awr_EmployeesAndDirectorMember |  |
Restricted Stock Units | Employees |  |  |  |  |
Stock compensation plans |  |  |  |  |
Stock-based compensation recognized in the income statement, before taxes | 1,354 us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember / us-gaap_TitleOfIndividualAxis = awr_EmployeesMember | 1,507 us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember / us-gaap_TitleOfIndividualAxis = awr_EmployeesMember | 1,729 us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember / us-gaap_TitleOfIndividualAxis = awr_EmployeesMember |  |
Restricted Stock Units | Employees | GSWC |  |  |  |  |
Stock compensation plans |  |  |  |  |
Stock-based compensation recognized in the income statement, before taxes | 1,113 us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember / us-gaap_TitleOfIndividualAxis = awr_EmployeesMember | 1,266 us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember / us-gaap_TitleOfIndividualAxis = awr_EmployeesMember | 1,468 us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember / us-gaap_TitleOfIndividualAxis = awr_EmployeesMember |  |
Performance awards |  |  |  |  |
Stock compensation plans |  |  |  |  |
Vesting period | 3 years |  |  |  |
Performance awards | Officer |  |  |  |  |
Stock compensation plans |  |  |  |  |
Stock-based compensation recognized in the income statement, before taxes | 868 us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = us-gaap_PerformanceSharesMember / us-gaap_TitleOfIndividualAxis = us-gaap_OfficerMember | 493 us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = us-gaap_PerformanceSharesMember / us-gaap_TitleOfIndividualAxis = us-gaap_OfficerMember | 52 us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = us-gaap_PerformanceSharesMember / us-gaap_TitleOfIndividualAxis = us-gaap_OfficerMember |  |
Performance awards | Officer | GSWC |  |  |  |  |
Stock compensation plans |  |  |  |  |
Stock-based compensation recognized in the income statement, before taxes | $ 635 us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = us-gaap_PerformanceSharesMember / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember / us-gaap_TitleOfIndividualAxis = us-gaap_OfficerMember | $ 373 us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = us-gaap_PerformanceSharesMember / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember / us-gaap_TitleOfIndividualAxis = us-gaap_OfficerMember | $ 52 us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = us-gaap_PerformanceSharesMember / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember / us-gaap_TitleOfIndividualAxis = us-gaap_OfficerMember |  |
2000 and 2008 Employee Plans | Nonqualified stock options |  |  |  |  |
Stock compensation plans |  |  |  |  |
Expiration term | 10 years |  |  |  |
Vesting period | 3 years |  |  |  |
Percentage of rights vesting in the first two years from the date of grant | 33.00%awr_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriodOfThirtyThreePercent / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember / us-gaap_PlanNameAxis = awr_EmployeePlans2000And2008Member |  |  |  |
Percentage of rights vesting in the third year from the date of grant | 34.00%awr_VestingRightsPercentageInThirdYearFromGrantDate / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember / us-gaap_PlanNameAxis = awr_EmployeePlans2000And2008Member |  |  |  |
2000 and 2008 Employee Plans | Restricted Stock Units |  |  |  |  |
Stock compensation plans |  |  |  |  |
Vesting period | 3 years |  |  |  |
Common stock entitled to be received under each award | 1 awr_ShareBasedCompensationArrangementByShareBasedPaymentAwardCommonStockEntitledToBeReceivedUnderEachAward / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember / us-gaap_PlanNameAxis = awr_EmployeePlans2000And2008Member |  |  |  |
Percentage of rights vesting in the first two years from the date of grant | 33.00%awr_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriodOfThirtyThreePercent / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember / us-gaap_PlanNameAxis = awr_EmployeePlans2000And2008Member |  |  |  |
Percentage of rights vesting in the third year from the date of grant | 34.00%awr_VestingRightsPercentageInThirdYearFromGrantDate / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember / us-gaap_PlanNameAxis = awr_EmployeePlans2000And2008Member |  |  |  |
2000 and 2008 Employee Plans | Performance awards |  |  |  |  |
Stock compensation plans |  |  |  |  |
Vesting period | 3 years |  |  |  |
Percentage of rights vesting in the first two years from the date of grant | 33.00%awr_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriodOfThirtyThreePercent / us-gaap_AwardTypeAxis = us-gaap_PerformanceSharesMember / us-gaap_PlanNameAxis = awr_EmployeePlans2000And2008Member |  |  |  |
Percentage of rights vesting in the third year from the date of grant | 34.00%awr_VestingRightsPercentageInThirdYearFromGrantDate / us-gaap_AwardTypeAxis = us-gaap_PerformanceSharesMember / us-gaap_PlanNameAxis = awr_EmployeePlans2000And2008Member |  |  |  |
2003 Directors Plan | Nonqualified stock options |  |  |  |  |
Stock compensation plans |  |  |  |  |
Expiration term | 10 years |  |  |  |
Vesting period | 3 years |  |  |  |

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- Definition Period in which 33% vesting rights is earned by awardeed of the grant, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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- Definition Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 14.F) -URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 14 -Section F + Details
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- Definition Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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