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CONSOLIDATED STATEMENTS OF INCOME (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Operating Revenues
Water	$ 71,504us-gaap_RegulatedOperatingRevenueWater	$ 70,757us-gaap_RegulatedOperatingRevenueWater
Electric	10,969us-gaap_ElectricDomesticRegulatedRevenue	10,456us-gaap_ElectricDomesticRegulatedRevenue
Contracted services	18,460us-gaap_ContractsRevenue	20,732us-gaap_ContractsRevenue
Total operating revenues	100,933us-gaap_SalesRevenueNet	101,945us-gaap_SalesRevenueNet
Operating Expenses
Water purchased	12,291us-gaap_CostOfPurchasedWater	11,224us-gaap_CostOfPurchasedWater
Power purchased for pumping	2,017awr_PowerPurchasedForPumping	1,964awr_PowerPurchasedForPumping
Groundwater production assessment	3,389awr_GroundwaterProductionAssessment	3,540awr_GroundwaterProductionAssessment
Power purchased for resale	2,499us-gaap_CostOfPurchasedPower	2,699us-gaap_CostOfPurchasedPower
Supply cost balancing accounts	1,813awr_SupplyCostBalancingAccounts	818awr_SupplyCostBalancingAccounts
Other operation	6,160us-gaap_OtherCostAndExpenseOperating	6,947us-gaap_OtherCostAndExpenseOperating
Administrative and general	19,527us-gaap_GeneralAndAdministrativeExpense	20,184us-gaap_GeneralAndAdministrativeExpense
Depreciation and amortization	10,548us-gaap_DepreciationDepletionAndAmortization	10,530us-gaap_DepreciationDepletionAndAmortization
Maintenance	3,477us-gaap_CostOfPropertyRepairsAndMaintenance	3,489us-gaap_CostOfPropertyRepairsAndMaintenance
Property and other taxes	4,276us-gaap_TaxesExcludingIncomeAndExciseTaxes	4,325us-gaap_TaxesExcludingIncomeAndExciseTaxes
ASUS construction	10,046us-gaap_OtherCostOfOperatingRevenue	13,457us-gaap_OtherCostOfOperatingRevenue
Total operating expenses	76,043us-gaap_OperatingExpenses	79,177us-gaap_OperatingExpenses
Operating Income	24,890us-gaap_OperatingIncomeLoss	22,768us-gaap_OperatingIncomeLoss
Other Income and Expenses
Interest expense	(5,228)us-gaap_InterestExpense	(5,627)us-gaap_InterestExpense
Interest income	112us-gaap_InvestmentIncomeInterest	112us-gaap_InvestmentIncomeInterest
Other, net	273us-gaap_OtherNonoperatingIncomeExpense	125us-gaap_OtherNonoperatingIncomeExpense
Total other income and expenses	(4,843)us-gaap_NonoperatingIncomeExpense	(5,390)us-gaap_NonoperatingIncomeExpense
Income from operations before income tax expense	20,047us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	17,378us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
Income tax expense	7,898us-gaap_IncomeTaxExpenseBenefit	6,357us-gaap_IncomeTaxExpenseBenefit
Net Income	12,149us-gaap_NetIncomeLoss	11,021us-gaap_NetIncomeLoss
Weighted Average Number of Common Shares Outstanding (in shares)	38,205us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	38,747us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Basic Earnings Per Common Share (in dollars per share)	$ 0.32us-gaap_EarningsPerShareBasic	$ 0.28us-gaap_EarningsPerShareBasic
Weighted Average Number of Diluted Shares (in shares)	38,408us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	38,944us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
Fully Diluted Earnings Per Common Share (in dollars per share)	$ 0.32us-gaap_EarningsPerShareDiluted	$ 0.28us-gaap_EarningsPerShareDiluted
Dividends Paid Per Common Share (in dollars per share)	$ 0.2130us-gaap_CommonStockDividendsPerShareCashPaid	$ 0.2025us-gaap_CommonStockDividendsPerShareCashPaid
GOLDEN STATE WATER COMPANY
Operating Revenues
Water	71,504us-gaap_RegulatedOperatingRevenueWater / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember	70,757us-gaap_RegulatedOperatingRevenueWater / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember
Electric	10,969us-gaap_ElectricDomesticRegulatedRevenue / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember	10,456us-gaap_ElectricDomesticRegulatedRevenue / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember
Total operating revenues	82,473us-gaap_SalesRevenueNet / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember	81,213us-gaap_SalesRevenueNet / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember
Operating Expenses
Water purchased	12,291us-gaap_CostOfPurchasedWater / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember	11,224us-gaap_CostOfPurchasedWater / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember
Power purchased for pumping	2,017awr_PowerPurchasedForPumping / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember	1,964awr_PowerPurchasedForPumping / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember
Groundwater production assessment	3,389awr_GroundwaterProductionAssessment / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember	3,540awr_GroundwaterProductionAssessment / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember
Power purchased for resale	2,499us-gaap_CostOfPurchasedPower / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember	2,699us-gaap_CostOfPurchasedPower / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember
Supply cost balancing accounts	1,813awr_SupplyCostBalancingAccounts / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember	818awr_SupplyCostBalancingAccounts / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember
Other operation	5,458us-gaap_OtherCostAndExpenseOperating / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember	6,356us-gaap_OtherCostAndExpenseOperating / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember
Administrative and general	15,557us-gaap_GeneralAndAdministrativeExpense / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember	16,985us-gaap_GeneralAndAdministrativeExpense / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember
Depreciation and amortization	10,241us-gaap_DepreciationDepletionAndAmortization / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember	10,240us-gaap_DepreciationDepletionAndAmortization / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember
Maintenance	2,817us-gaap_CostOfPropertyRepairsAndMaintenance / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember	3,061us-gaap_CostOfPropertyRepairsAndMaintenance / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember
Property and other taxes	3,918us-gaap_TaxesExcludingIncomeAndExciseTaxes / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember	3,896us-gaap_TaxesExcludingIncomeAndExciseTaxes / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember
Total operating expenses	60,000us-gaap_OperatingExpenses / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember	60,783us-gaap_OperatingExpenses / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember
Operating Income	22,473us-gaap_OperatingIncomeLoss / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember	20,430us-gaap_OperatingIncomeLoss / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember
Other Income and Expenses
Interest expense	(5,218)us-gaap_InterestExpense / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember	(5,611)us-gaap_InterestExpense / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember
Interest income	104us-gaap_InvestmentIncomeInterest / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember	109us-gaap_InvestmentIncomeInterest / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember
Other, net	273us-gaap_OtherNonoperatingIncomeExpense / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember	124us-gaap_OtherNonoperatingIncomeExpense / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember
Total other income and expenses	(4,841)us-gaap_NonoperatingIncomeExpense / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember	(5,378)us-gaap_NonoperatingIncomeExpense / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember
Income from operations before income tax expense	17,632us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember	15,052us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember
Income tax expense	7,247us-gaap_IncomeTaxExpenseBenefit / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember	5,705us-gaap_IncomeTaxExpenseBenefit / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember
Net Income	$ 10,385us-gaap_NetIncomeLoss / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember	$ 9,347us-gaap_NetIncomeLoss / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember

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The aggregate amount of income or expense from ancillary business-related activities (that is to say, excluding major activities considered part of the normal operations of the business).

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The amount of regulated water operating revenues recognized during the period.

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Total revenue from sale of goods and services rendered during the reporting period, in the normal course of business, reduced by sales returns and allowances, and sales discounts.

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All taxes not related to income of the entity or excise or sales taxes levied on the revenue of the entity that are not reported elsewhere. These taxes could include production, real estate, personal property, and pump tax.

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