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Business Segments (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Details of reportable segment      
Operating revenues $ 465,791us-gaap_SalesRevenueNet $ 472,077us-gaap_SalesRevenueNet $ 466,908us-gaap_SalesRevenueNet
Operating income (loss) 119,045us-gaap_OperatingIncomeLoss 119,072us-gaap_OperatingIncomeLoss 111,094us-gaap_OperatingIncomeLoss
Interest expense, net (20,690)us-gaap_InterestIncomeExpenseNonoperatingNet (21,708)us-gaap_InterestIncomeExpenseNonoperatingNet (21,432)us-gaap_InterestIncomeExpenseNonoperatingNet
Utility Plant 1,003,520us-gaap_PropertyPlantAndEquipmentNet 981,477us-gaap_PropertyPlantAndEquipmentNet 917,791us-gaap_PropertyPlantAndEquipmentNet
Depreciation and amortization expense 41,073us-gaap_DepreciationDepletionAndAmortization [1] 40,090us-gaap_DepreciationDepletionAndAmortization [1] 41,385us-gaap_DepreciationDepletionAndAmortization [1]
Income tax expense/(benefit) 38,048us-gaap_IncomeTaxExpenseBenefit 35,783us-gaap_IncomeTaxExpenseBenefit 35,945us-gaap_IncomeTaxExpenseBenefit
Capital additions 72,553us-gaap_PropertyPlantAndEquipmentAdditions 97,379us-gaap_PropertyPlantAndEquipmentAdditions 68,104us-gaap_PropertyPlantAndEquipmentAdditions
GSWC      
Details of reportable segment      
Number of reportable segments 2us-gaap_NumberOfReportableSegments
/ dei_LegalEntityAxis
= awr_GoldenStateWaterCompanyMember
   
Operating revenues 361,059us-gaap_SalesRevenueNet
/ dei_LegalEntityAxis
= awr_GoldenStateWaterCompanyMember
358,540us-gaap_SalesRevenueNet
/ dei_LegalEntityAxis
= awr_GoldenStateWaterCompanyMember
342,931us-gaap_SalesRevenueNet
/ dei_LegalEntityAxis
= awr_GoldenStateWaterCompanyMember
Operating income (loss) 99,742us-gaap_OperatingIncomeLoss
/ dei_LegalEntityAxis
= awr_GoldenStateWaterCompanyMember
102,343us-gaap_OperatingIncomeLoss
/ dei_LegalEntityAxis
= awr_GoldenStateWaterCompanyMember
86,605us-gaap_OperatingIncomeLoss
/ dei_LegalEntityAxis
= awr_GoldenStateWaterCompanyMember
Utility Plant 998,880us-gaap_PropertyPlantAndEquipmentNet
/ dei_LegalEntityAxis
= awr_GoldenStateWaterCompanyMember
977,294us-gaap_PropertyPlantAndEquipmentNet
/ dei_LegalEntityAxis
= awr_GoldenStateWaterCompanyMember
 
Depreciation and amortization expense 39,854us-gaap_DepreciationDepletionAndAmortization
/ dei_LegalEntityAxis
= awr_GoldenStateWaterCompanyMember
38,952us-gaap_DepreciationDepletionAndAmortization
/ dei_LegalEntityAxis
= awr_GoldenStateWaterCompanyMember
40,197us-gaap_DepreciationDepletionAndAmortization
/ dei_LegalEntityAxis
= awr_GoldenStateWaterCompanyMember
Income tax expense/(benefit) 32,006us-gaap_IncomeTaxExpenseBenefit
/ dei_LegalEntityAxis
= awr_GoldenStateWaterCompanyMember
33,134us-gaap_IncomeTaxExpenseBenefit
/ dei_LegalEntityAxis
= awr_GoldenStateWaterCompanyMember
26,500us-gaap_IncomeTaxExpenseBenefit
/ dei_LegalEntityAxis
= awr_GoldenStateWaterCompanyMember
GSWC | Water      
Details of reportable segment      
Operating revenues 326,672us-gaap_SalesRevenueNet
/ dei_LegalEntityAxis
= awr_GoldenStateWaterCompanyMember
/ us-gaap_StatementBusinessSegmentsAxis
= awr_WaterServiceUtilityOperationsMember
320,131us-gaap_SalesRevenueNet
/ dei_LegalEntityAxis
= awr_GoldenStateWaterCompanyMember
/ us-gaap_StatementBusinessSegmentsAxis
= awr_WaterServiceUtilityOperationsMember
305,898us-gaap_SalesRevenueNet
/ dei_LegalEntityAxis
= awr_GoldenStateWaterCompanyMember
/ us-gaap_StatementBusinessSegmentsAxis
= awr_WaterServiceUtilityOperationsMember
Operating income (loss) 94,014us-gaap_OperatingIncomeLoss
/ dei_LegalEntityAxis
= awr_GoldenStateWaterCompanyMember
/ us-gaap_StatementBusinessSegmentsAxis
= awr_WaterServiceUtilityOperationsMember
95,932us-gaap_OperatingIncomeLoss
/ dei_LegalEntityAxis
= awr_GoldenStateWaterCompanyMember
/ us-gaap_StatementBusinessSegmentsAxis
= awr_WaterServiceUtilityOperationsMember
78,104us-gaap_OperatingIncomeLoss
/ dei_LegalEntityAxis
= awr_GoldenStateWaterCompanyMember
/ us-gaap_StatementBusinessSegmentsAxis
= awr_WaterServiceUtilityOperationsMember
Interest expense, net (19,370)us-gaap_InterestIncomeExpenseNonoperatingNet
/ dei_LegalEntityAxis
= awr_GoldenStateWaterCompanyMember
/ us-gaap_StatementBusinessSegmentsAxis
= awr_WaterServiceUtilityOperationsMember
(20,236)us-gaap_InterestIncomeExpenseNonoperatingNet
/ dei_LegalEntityAxis
= awr_GoldenStateWaterCompanyMember
/ us-gaap_StatementBusinessSegmentsAxis
= awr_WaterServiceUtilityOperationsMember
(19,783)us-gaap_InterestIncomeExpenseNonoperatingNet
/ dei_LegalEntityAxis
= awr_GoldenStateWaterCompanyMember
/ us-gaap_StatementBusinessSegmentsAxis
= awr_WaterServiceUtilityOperationsMember
Utility Plant 953,678us-gaap_PropertyPlantAndEquipmentNet
/ dei_LegalEntityAxis
= awr_GoldenStateWaterCompanyMember
/ us-gaap_StatementBusinessSegmentsAxis
= awr_WaterServiceUtilityOperationsMember
936,386us-gaap_PropertyPlantAndEquipmentNet
/ dei_LegalEntityAxis
= awr_GoldenStateWaterCompanyMember
/ us-gaap_StatementBusinessSegmentsAxis
= awr_WaterServiceUtilityOperationsMember
871,756us-gaap_PropertyPlantAndEquipmentNet
/ dei_LegalEntityAxis
= awr_GoldenStateWaterCompanyMember
/ us-gaap_StatementBusinessSegmentsAxis
= awr_WaterServiceUtilityOperationsMember
Depreciation and amortization expense 38,388us-gaap_DepreciationDepletionAndAmortization
/ dei_LegalEntityAxis
= awr_GoldenStateWaterCompanyMember
/ us-gaap_StatementBusinessSegmentsAxis
= awr_WaterServiceUtilityOperationsMember
[1] 36,636us-gaap_DepreciationDepletionAndAmortization
/ dei_LegalEntityAxis
= awr_GoldenStateWaterCompanyMember
/ us-gaap_StatementBusinessSegmentsAxis
= awr_WaterServiceUtilityOperationsMember
[1] 37,905us-gaap_DepreciationDepletionAndAmortization
/ dei_LegalEntityAxis
= awr_GoldenStateWaterCompanyMember
/ us-gaap_StatementBusinessSegmentsAxis
= awr_WaterServiceUtilityOperationsMember
[1]
Income tax expense/(benefit) 30,410us-gaap_IncomeTaxExpenseBenefit
/ dei_LegalEntityAxis
= awr_GoldenStateWaterCompanyMember
/ us-gaap_StatementBusinessSegmentsAxis
= awr_WaterServiceUtilityOperationsMember
30,679us-gaap_IncomeTaxExpenseBenefit
/ dei_LegalEntityAxis
= awr_GoldenStateWaterCompanyMember
/ us-gaap_StatementBusinessSegmentsAxis
= awr_WaterServiceUtilityOperationsMember
24,231us-gaap_IncomeTaxExpenseBenefit
/ dei_LegalEntityAxis
= awr_GoldenStateWaterCompanyMember
/ us-gaap_StatementBusinessSegmentsAxis
= awr_WaterServiceUtilityOperationsMember
Capital additions 66,304us-gaap_PropertyPlantAndEquipmentAdditions
/ dei_LegalEntityAxis
= awr_GoldenStateWaterCompanyMember
/ us-gaap_StatementBusinessSegmentsAxis
= awr_WaterServiceUtilityOperationsMember
94,581us-gaap_PropertyPlantAndEquipmentAdditions
/ dei_LegalEntityAxis
= awr_GoldenStateWaterCompanyMember
/ us-gaap_StatementBusinessSegmentsAxis
= awr_WaterServiceUtilityOperationsMember
62,500us-gaap_PropertyPlantAndEquipmentAdditions
/ dei_LegalEntityAxis
= awr_GoldenStateWaterCompanyMember
/ us-gaap_StatementBusinessSegmentsAxis
= awr_WaterServiceUtilityOperationsMember
GSWC | Electric      
Details of reportable segment      
Operating revenues 34,387us-gaap_SalesRevenueNet
/ dei_LegalEntityAxis
= awr_GoldenStateWaterCompanyMember
/ us-gaap_StatementBusinessSegmentsAxis
= awr_ElectricServiceUtilityOperationsMember
38,409us-gaap_SalesRevenueNet
/ dei_LegalEntityAxis
= awr_GoldenStateWaterCompanyMember
/ us-gaap_StatementBusinessSegmentsAxis
= awr_ElectricServiceUtilityOperationsMember
37,033us-gaap_SalesRevenueNet
/ dei_LegalEntityAxis
= awr_GoldenStateWaterCompanyMember
/ us-gaap_StatementBusinessSegmentsAxis
= awr_ElectricServiceUtilityOperationsMember
Operating income (loss) 5,728us-gaap_OperatingIncomeLoss
/ dei_LegalEntityAxis
= awr_GoldenStateWaterCompanyMember
/ us-gaap_StatementBusinessSegmentsAxis
= awr_ElectricServiceUtilityOperationsMember
6,411us-gaap_OperatingIncomeLoss
/ dei_LegalEntityAxis
= awr_GoldenStateWaterCompanyMember
/ us-gaap_StatementBusinessSegmentsAxis
= awr_ElectricServiceUtilityOperationsMember
8,501us-gaap_OperatingIncomeLoss
/ dei_LegalEntityAxis
= awr_GoldenStateWaterCompanyMember
/ us-gaap_StatementBusinessSegmentsAxis
= awr_ElectricServiceUtilityOperationsMember
Interest expense, net (1,260)us-gaap_InterestIncomeExpenseNonoperatingNet
/ dei_LegalEntityAxis
= awr_GoldenStateWaterCompanyMember
/ us-gaap_StatementBusinessSegmentsAxis
= awr_ElectricServiceUtilityOperationsMember
(1,436)us-gaap_InterestIncomeExpenseNonoperatingNet
/ dei_LegalEntityAxis
= awr_GoldenStateWaterCompanyMember
/ us-gaap_StatementBusinessSegmentsAxis
= awr_ElectricServiceUtilityOperationsMember
(1,533)us-gaap_InterestIncomeExpenseNonoperatingNet
/ dei_LegalEntityAxis
= awr_GoldenStateWaterCompanyMember
/ us-gaap_StatementBusinessSegmentsAxis
= awr_ElectricServiceUtilityOperationsMember
Utility Plant 45,202us-gaap_PropertyPlantAndEquipmentNet
/ dei_LegalEntityAxis
= awr_GoldenStateWaterCompanyMember
/ us-gaap_StatementBusinessSegmentsAxis
= awr_ElectricServiceUtilityOperationsMember
40,908us-gaap_PropertyPlantAndEquipmentNet
/ dei_LegalEntityAxis
= awr_GoldenStateWaterCompanyMember
/ us-gaap_StatementBusinessSegmentsAxis
= awr_ElectricServiceUtilityOperationsMember
41,381us-gaap_PropertyPlantAndEquipmentNet
/ dei_LegalEntityAxis
= awr_GoldenStateWaterCompanyMember
/ us-gaap_StatementBusinessSegmentsAxis
= awr_ElectricServiceUtilityOperationsMember
Depreciation and amortization expense 1,466us-gaap_DepreciationDepletionAndAmortization
/ dei_LegalEntityAxis
= awr_GoldenStateWaterCompanyMember
/ us-gaap_StatementBusinessSegmentsAxis
= awr_ElectricServiceUtilityOperationsMember
[1] 2,316us-gaap_DepreciationDepletionAndAmortization
/ dei_LegalEntityAxis
= awr_GoldenStateWaterCompanyMember
/ us-gaap_StatementBusinessSegmentsAxis
= awr_ElectricServiceUtilityOperationsMember
[1] 2,292us-gaap_DepreciationDepletionAndAmortization
/ dei_LegalEntityAxis
= awr_GoldenStateWaterCompanyMember
/ us-gaap_StatementBusinessSegmentsAxis
= awr_ElectricServiceUtilityOperationsMember
[1]
Income tax expense/(benefit) 1,596us-gaap_IncomeTaxExpenseBenefit
/ dei_LegalEntityAxis
= awr_GoldenStateWaterCompanyMember
/ us-gaap_StatementBusinessSegmentsAxis
= awr_ElectricServiceUtilityOperationsMember
2,455us-gaap_IncomeTaxExpenseBenefit
/ dei_LegalEntityAxis
= awr_GoldenStateWaterCompanyMember
/ us-gaap_StatementBusinessSegmentsAxis
= awr_ElectricServiceUtilityOperationsMember
2,269us-gaap_IncomeTaxExpenseBenefit
/ dei_LegalEntityAxis
= awr_GoldenStateWaterCompanyMember
/ us-gaap_StatementBusinessSegmentsAxis
= awr_ElectricServiceUtilityOperationsMember
Capital additions 4,584us-gaap_PropertyPlantAndEquipmentAdditions
/ dei_LegalEntityAxis
= awr_GoldenStateWaterCompanyMember
/ us-gaap_StatementBusinessSegmentsAxis
= awr_ElectricServiceUtilityOperationsMember
2,124us-gaap_PropertyPlantAndEquipmentAdditions
/ dei_LegalEntityAxis
= awr_GoldenStateWaterCompanyMember
/ us-gaap_StatementBusinessSegmentsAxis
= awr_ElectricServiceUtilityOperationsMember
4,331us-gaap_PropertyPlantAndEquipmentAdditions
/ dei_LegalEntityAxis
= awr_GoldenStateWaterCompanyMember
/ us-gaap_StatementBusinessSegmentsAxis
= awr_ElectricServiceUtilityOperationsMember
American States Utility Services [Member] | Military Utility Privatization Subsidiaries      
Details of reportable segment      
Operating revenues 104,732us-gaap_SalesRevenueNet
/ dei_LegalEntityAxis
= awr_AmericanStatesUtilityServicesMember
/ us-gaap_StatementBusinessSegmentsAxis
= awr_ContractedServicesMember
113,537us-gaap_SalesRevenueNet
/ dei_LegalEntityAxis
= awr_AmericanStatesUtilityServicesMember
/ us-gaap_StatementBusinessSegmentsAxis
= awr_ContractedServicesMember
123,977us-gaap_SalesRevenueNet
/ dei_LegalEntityAxis
= awr_AmericanStatesUtilityServicesMember
/ us-gaap_StatementBusinessSegmentsAxis
= awr_ContractedServicesMember
Operating income (loss) 19,351us-gaap_OperatingIncomeLoss
/ dei_LegalEntityAxis
= awr_AmericanStatesUtilityServicesMember
/ us-gaap_StatementBusinessSegmentsAxis
= awr_ContractedServicesMember
16,737us-gaap_OperatingIncomeLoss
/ dei_LegalEntityAxis
= awr_AmericanStatesUtilityServicesMember
/ us-gaap_StatementBusinessSegmentsAxis
= awr_ContractedServicesMember
24,608us-gaap_OperatingIncomeLoss
/ dei_LegalEntityAxis
= awr_AmericanStatesUtilityServicesMember
/ us-gaap_StatementBusinessSegmentsAxis
= awr_ContractedServicesMember
Interest expense, net (142)us-gaap_InterestIncomeExpenseNonoperatingNet
/ dei_LegalEntityAxis
= awr_AmericanStatesUtilityServicesMember
/ us-gaap_StatementBusinessSegmentsAxis
= awr_ContractedServicesMember
(264)us-gaap_InterestIncomeExpenseNonoperatingNet
/ dei_LegalEntityAxis
= awr_AmericanStatesUtilityServicesMember
/ us-gaap_StatementBusinessSegmentsAxis
= awr_ContractedServicesMember
(179)us-gaap_InterestIncomeExpenseNonoperatingNet
/ dei_LegalEntityAxis
= awr_AmericanStatesUtilityServicesMember
/ us-gaap_StatementBusinessSegmentsAxis
= awr_ContractedServicesMember
Utility Plant 4,640us-gaap_PropertyPlantAndEquipmentNet
/ dei_LegalEntityAxis
= awr_AmericanStatesUtilityServicesMember
/ us-gaap_StatementBusinessSegmentsAxis
= awr_ContractedServicesMember
4,183us-gaap_PropertyPlantAndEquipmentNet
/ dei_LegalEntityAxis
= awr_AmericanStatesUtilityServicesMember
/ us-gaap_StatementBusinessSegmentsAxis
= awr_ContractedServicesMember
4,654us-gaap_PropertyPlantAndEquipmentNet
/ dei_LegalEntityAxis
= awr_AmericanStatesUtilityServicesMember
/ us-gaap_StatementBusinessSegmentsAxis
= awr_ContractedServicesMember
Depreciation and amortization expense 1,219us-gaap_DepreciationDepletionAndAmortization
/ dei_LegalEntityAxis
= awr_AmericanStatesUtilityServicesMember
/ us-gaap_StatementBusinessSegmentsAxis
= awr_ContractedServicesMember
[1] 1,138us-gaap_DepreciationDepletionAndAmortization
/ dei_LegalEntityAxis
= awr_AmericanStatesUtilityServicesMember
/ us-gaap_StatementBusinessSegmentsAxis
= awr_ContractedServicesMember
[1] 1,188us-gaap_DepreciationDepletionAndAmortization
/ dei_LegalEntityAxis
= awr_AmericanStatesUtilityServicesMember
/ us-gaap_StatementBusinessSegmentsAxis
= awr_ContractedServicesMember
[1]
Income tax expense/(benefit) 7,038us-gaap_IncomeTaxExpenseBenefit
/ dei_LegalEntityAxis
= awr_AmericanStatesUtilityServicesMember
/ us-gaap_StatementBusinessSegmentsAxis
= awr_ContractedServicesMember
4,911us-gaap_IncomeTaxExpenseBenefit
/ dei_LegalEntityAxis
= awr_AmericanStatesUtilityServicesMember
/ us-gaap_StatementBusinessSegmentsAxis
= awr_ContractedServicesMember
9,437us-gaap_IncomeTaxExpenseBenefit
/ dei_LegalEntityAxis
= awr_AmericanStatesUtilityServicesMember
/ us-gaap_StatementBusinessSegmentsAxis
= awr_ContractedServicesMember
Capital additions 1,665us-gaap_PropertyPlantAndEquipmentAdditions
/ dei_LegalEntityAxis
= awr_AmericanStatesUtilityServicesMember
/ us-gaap_StatementBusinessSegmentsAxis
= awr_ContractedServicesMember
674us-gaap_PropertyPlantAndEquipmentAdditions
/ dei_LegalEntityAxis
= awr_AmericanStatesUtilityServicesMember
/ us-gaap_StatementBusinessSegmentsAxis
= awr_ContractedServicesMember
1,273us-gaap_PropertyPlantAndEquipmentAdditions
/ dei_LegalEntityAxis
= awr_AmericanStatesUtilityServicesMember
/ us-gaap_StatementBusinessSegmentsAxis
= awr_ContractedServicesMember
AWR Parent      
Details of reportable segment      
Number of reportable segments 3us-gaap_NumberOfReportableSegments
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
   
Operating revenues 0us-gaap_SalesRevenueNet
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
0us-gaap_SalesRevenueNet
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
0us-gaap_SalesRevenueNet
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Operating income (loss) (48)us-gaap_OperatingIncomeLoss
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
(8)us-gaap_OperatingIncomeLoss
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
(119)us-gaap_OperatingIncomeLoss
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Interest expense, net 82us-gaap_InterestIncomeExpenseNonoperatingNet
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
228us-gaap_InterestIncomeExpenseNonoperatingNet
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
63us-gaap_InterestIncomeExpenseNonoperatingNet
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Utility Plant 0us-gaap_PropertyPlantAndEquipmentNet
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
0us-gaap_PropertyPlantAndEquipmentNet
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
0us-gaap_PropertyPlantAndEquipmentNet
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Depreciation and amortization expense 0us-gaap_DepreciationDepletionAndAmortization
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
[1] 0us-gaap_DepreciationDepletionAndAmortization
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
[1] 0us-gaap_DepreciationDepletionAndAmortization
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
[1]
Income tax expense/(benefit) (996)us-gaap_IncomeTaxExpenseBenefit
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
(2,262)us-gaap_IncomeTaxExpenseBenefit
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
8us-gaap_IncomeTaxExpenseBenefit
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Capital additions $ 0us-gaap_PropertyPlantAndEquipmentAdditions
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
$ 0us-gaap_PropertyPlantAndEquipmentAdditions
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
$ 0us-gaap_PropertyPlantAndEquipmentAdditions
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
[1] Depreciation computed on GSWC’s transportation equipment is recorded in other operating expenses and totaled $678,000, $877,000 and $1.8 million for the years ended December 31, 2014, 2013 and 2012, respectively.