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SCHEDULE I - CONDENSED FINANCIAL INFORMATION OF PARENT (Details 4) (USD $) | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Short-term borrowing (excluding letters of credit) |  |  |
Short-term borrowing activities (excluding letters of credit) |  |  |
Balance outstanding at the end of the period | $ 0 us-gaap_NotesPayableToBankCurrent / us-gaap_DebtInstrumentAxis = awr_ShorttermBorrowingsMember | $ 0 us-gaap_NotesPayableToBankCurrent / us-gaap_DebtInstrumentAxis = awr_ShorttermBorrowingsMember | $ 0 us-gaap_NotesPayableToBankCurrent / us-gaap_DebtInstrumentAxis = awr_ShorttermBorrowingsMember
Interest Rate at the end of the period (as a percent) | 0.82%us-gaap_DebtInstrumentInterestRateEffectivePercentage / us-gaap_DebtInstrumentAxis = awr_ShorttermBorrowingsMember | 0.82%us-gaap_DebtInstrumentInterestRateEffectivePercentage / us-gaap_DebtInstrumentAxis = awr_ShorttermBorrowingsMember | 1.41%us-gaap_DebtInstrumentInterestRateEffectivePercentage / us-gaap_DebtInstrumentAxis = awr_ShorttermBorrowingsMember
Average Amount Outstanding | 6,181,000 us-gaap_ShorttermDebtAverageOutstandingAmount / us-gaap_DebtInstrumentAxis = awr_ShorttermBorrowingsMember | 0 us-gaap_ShorttermDebtAverageOutstandingAmount / us-gaap_DebtInstrumentAxis = awr_ShorttermBorrowingsMember | 885,000 us-gaap_ShorttermDebtAverageOutstandingAmount / us-gaap_DebtInstrumentAxis = awr_ShorttermBorrowingsMember
Weighted Average Annual Interest Rate (as a percent) | 0.81%us-gaap_ShortTermDebtWeightedAverageInterestRate / us-gaap_DebtInstrumentAxis = awr_ShorttermBorrowingsMember | 1.02%us-gaap_ShortTermDebtWeightedAverageInterestRate / us-gaap_DebtInstrumentAxis = awr_ShorttermBorrowingsMember | 1.49%us-gaap_ShortTermDebtWeightedAverageInterestRate / us-gaap_DebtInstrumentAxis = awr_ShorttermBorrowingsMember
Maximum Amount Outstanding | 24,000,000 us-gaap_ShorttermDebtMaximumAmountOutstandingDuringPeriod / us-gaap_DebtInstrumentAxis = awr_ShorttermBorrowingsMember | 0 us-gaap_ShorttermDebtMaximumAmountOutstandingDuringPeriod / us-gaap_DebtInstrumentAxis = awr_ShorttermBorrowingsMember | 6,000,000 us-gaap_ShorttermDebtMaximumAmountOutstandingDuringPeriod / us-gaap_DebtInstrumentAxis = awr_ShorttermBorrowingsMember
Syndicated revolving credit facility |  |  |
Note payable to banks |  |  |
Increase in additional aggregate bank commitments | 50,000,000.0 awr_LineOfCreditFacilityElectiveMaximumAdditionalBorrowingCapacity / us-gaap_CreditFacilityAxis = awr_SyndicatedRevolvingCreditFacilityMember |  |
Variable rate basis | Euro rate |  |
Syndicated revolving credit facility | Minimum |  |  |
Short-term borrowing activities (excluding letters of credit) |  |  |
Interest coverage ratio | 325.00%awr_DebtInstrumentCovenantInterestCoverageRatio / us-gaap_CreditFacilityAxis = awr_SyndicatedRevolvingCreditFacilityMember / us-gaap_RangeAxis = us-gaap_MinimumMember |  |
Syndicated revolving credit facility | Maximum |  |  |
Short-term borrowing activities (excluding letters of credit) |  |  |
Total funded debt ratio | 65.00%awr_DebtInstrumentCovenantFundedDebtRatio / us-gaap_CreditFacilityAxis = awr_SyndicatedRevolvingCreditFacilityMember / us-gaap_RangeAxis = us-gaap_MaximumMember |  |
Letters of credit | Letter of Credit Irrevocable Franchise Agreement with City of Rancho Cordova [Member] |  |  |
Note payable to banks |  |  |
Letter of credit, amount | 15,000,000 us-gaap_LettersOfCreditOutstandingAmount / us-gaap_CreditFacilityAxis = us-gaap_LetterOfCreditMember / us-gaap_DebtInstrumentAxis = awr_LetterofCreditIrrevocableFranchiseAgreementwithCityofRanchoCordovaMember |  |
GOLDEN STATE WATER COMPANY |  |  |
Short-term borrowing activities (excluding letters of credit) |  |  |
Dividends paid | 52,000,000 awr_PaymentsOfDividendsFromSubsidiaries / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember | 29,400,000 awr_PaymentsOfDividendsFromSubsidiaries / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember | 10,200,000 awr_PaymentsOfDividendsFromSubsidiaries / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember
AWR |  |  |
Note payable to banks |  |  |
Employee Service Share-based Compensation, Tax Benefit from Compensation Expense | 1,500,000 us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Maximum borrowing capacity | 100,000,000.0 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Short-term borrowing activities (excluding letters of credit) |  |  |
Dividends paid |  |  | (16,900,000)awr_PaymentsOfDividendsFromSubsidiaries / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
AWR | Syndicated revolving credit facility |  |  |
Note payable to banks |  |  |
Increase in additional aggregate bank commitments | 50,000,000.0 awr_LineOfCreditFacilityElectiveMaximumAdditionalBorrowingCapacity / us-gaap_CreditFacilityAxis = awr_SyndicatedRevolvingCreditFacilityMember / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Short-term borrowing activities (excluding letters of credit) |  |  |
Interest coverage ratio | 752.00%awr_DebtInstrumentCovenantInterestCoverageRatio / us-gaap_CreditFacilityAxis = awr_SyndicatedRevolvingCreditFacilityMember / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Total funded debt ratio | 40.00%awr_DebtInstrumentCovenantFundedDebtRatio / us-gaap_CreditFacilityAxis = awr_SyndicatedRevolvingCreditFacilityMember / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
AWR | Syndicated revolving credit facility | Minimum |  |  |
Short-term borrowing activities (excluding letters of credit) |  |  |
Interest coverage ratio | 325.00%awr_DebtInstrumentCovenantInterestCoverageRatio / us-gaap_CreditFacilityAxis = awr_SyndicatedRevolvingCreditFacilityMember / dei_LegalEntityAxis = us-gaap_ParentCompanyMember / us-gaap_RangeAxis = us-gaap_MinimumMember |  |
AWR | Syndicated revolving credit facility | Maximum |  |  |
Short-term borrowing activities (excluding letters of credit) |  |  |
Total funded debt ratio | 65.00%awr_DebtInstrumentCovenantFundedDebtRatio / us-gaap_CreditFacilityAxis = awr_SyndicatedRevolvingCreditFacilityMember / dei_LegalEntityAxis = us-gaap_ParentCompanyMember / us-gaap_RangeAxis = us-gaap_MaximumMember |  |
AWR | Syndicated revolving credit facility | Letters of credit |  |  |
Note payable to banks |  |  |
Maximum borrowing capacity | 25,000,000 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_CreditFacilityAxis = awr_SyndicatedRevolvingCreditFacilityMember / us-gaap_DebtInstrumentAxis = us-gaap_LetterOfCreditMember / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Letter of credit, amount | 11,200,000 us-gaap_LettersOfCreditOutstandingAmount / us-gaap_CreditFacilityAxis = awr_SyndicatedRevolvingCreditFacilityMember / us-gaap_DebtInstrumentAxis = us-gaap_LetterOfCreditMember / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Letter of credit fee (as a percent) | 0.65%us-gaap_LineOfCreditFacilityCommitmentFeePercentage / us-gaap_CreditFacilityAxis = awr_SyndicatedRevolvingCreditFacilityMember / us-gaap_DebtInstrumentAxis = us-gaap_LetterOfCreditMember / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
AWR | Syndicated revolving credit facility | Letter of Credit - GSWC business automobile insurance policy |  |  |
Note payable to banks |  |  |
Letter of credit, amount | 340,000 us-gaap_LettersOfCreditOutstandingAmount / us-gaap_CreditFacilityAxis = awr_SyndicatedRevolvingCreditFacilityMember / us-gaap_DebtInstrumentAxis = awr_LetterOfCreditBusinessAutomobileInsurancePolicySecurityMember / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
AWR | Syndicated revolving credit facility | Letter of Credit - Purchase of power |  |  |
Note payable to banks |  |  |
Letter of credit, amount | 585,000,000 us-gaap_LettersOfCreditOutstandingAmount / us-gaap_CreditFacilityAxis = awr_SyndicatedRevolvingCreditFacilityMember / us-gaap_DebtInstrumentAxis = awr_LetterOfCreditPurchaseOfPowerSecurityMember / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
AWR | Syndicated revolving credit facility | Letter of Credit - American Recovery and Reinvestment Act |  |  |
Note payable to banks |  |  |
Letter of credit, amount | 6,700,000 us-gaap_LettersOfCreditOutstandingAmount / us-gaap_CreditFacilityAxis = awr_SyndicatedRevolvingCreditFacilityMember / us-gaap_DebtInstrumentAxis = awr_LetterOfCreditAmericanRecoveryAndReinvestmentActCostReimbursementsMember / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
AWR | Syndicated revolving credit facility | Irrevocable Letter of Credit - Edison Settlement agreement |  |  |
Note payable to banks |  |  |
Letter of credit, amount | $ 3,600,000 us-gaap_LettersOfCreditOutstandingAmount / us-gaap_CreditFacilityAxis = awr_SyndicatedRevolvingCreditFacilityMember / us-gaap_DebtInstrumentAxis = awr_LetterOfCreditIrrevocableEdisonSettlementAgreementMember / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |

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