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Regulatory Matters (Details 2) (USD $)	12 Months Ended	1 Months Ended
	Dec. 31, 2014	Apr. 30, 2012	Nov. 30, 2014	Dec. 31, 2013
WRAM
Regulatory matters:
Over collection	$ 7,400,000us-gaap_IncreaseDecreaseInOtherRegulatoryAssets / us-gaap_RegulatoryAssetAxis = awr_WaterRevenueAdjustmentMechanismMember
GSWC
Regulatory matters:
Under (over) collection	125,704,000us-gaap_NetRegulatoryAssets / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember			122,681,000us-gaap_NetRegulatoryAssets / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember
GSWC | WRAM, net of MCBA
Regulatory matters:
Commercial paper, term	90 days
Amount billed to customers as surcharges	14,300,000awr_RegulatoryAssetAmountBilledToCustomersAsSurcharges / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember / us-gaap_RegulatoryAssetAxis = awr_WaterRevenueAdjustmentMechanismNetOfModifiedCostBalancingAccountMember
Under (over) collection	(9,400,000)us-gaap_NetRegulatoryAssets / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember / us-gaap_RegulatoryAssetAxis = awr_WaterRevenueAdjustmentMechanismNetOfModifiedCostBalancingAccountMember			16,345,000us-gaap_NetRegulatoryAssets / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember / us-gaap_RegulatoryAssetAxis = awr_WaterRevenueAdjustmentMechanismNetOfModifiedCostBalancingAccountMember
Under-collection balances as a percentage of adopted annual revenues		15.00%awr_UnderCollectionBalancesAsPercentageOfAdoptedAnnualRevenues / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember / us-gaap_RegulatoryAssetAxis = awr_WaterRevenueAdjustmentMechanismNetOfModifiedCostBalancingAccountMember
Annual surcharges as a percentage of the last authorized revenue requirement		10.00%awr_AnnualSurchargesAsPercentageOfLastAuthorizedRevenueRequirement / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember / us-gaap_RegulatoryAssetAxis = awr_WaterRevenueAdjustmentMechanismNetOfModifiedCostBalancingAccountMember
GSWC | WRAM, net of MCBA | Minimum
Regulatory matters:
Recovery period for under-collection balances greater than 15% of adopted annual revenues		19 months
GSWC | WRAM, net of MCBA | Maximum
Regulatory matters:
Alternative revenue program	24 months
Recovery period for under-collection balances that are up to 15% of adopted annual revenues		36 months
Recovery period for under-collection balances greater than 15% of adopted annual revenues	18 months
GSWC | WRAM
Regulatory matters:
Under (over) collection	10,500,000us-gaap_NetRegulatoryAssets / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember / us-gaap_RegulatoryAssetAxis = awr_WaterRevenueAdjustmentMechanismMember
GSWC | Modified Cost Balancing Account
Regulatory matters:
Under (over) collection	1,100,000us-gaap_NetRegulatoryAssets / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember / us-gaap_RegulatoryAssetAxis = awr_ModifiedCostBalancingAccountMember
GSWC | Base revenue requirement adjustment mechanism
Regulatory matters:
Under (over) collection	7,761,000us-gaap_NetRegulatoryAssets / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember / us-gaap_RegulatoryAssetAxis = awr_BaseRevenueRequirementAdjustmentMechanismMember			8,725,000us-gaap_NetRegulatoryAssets / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember / us-gaap_RegulatoryAssetAxis = awr_BaseRevenueRequirementAdjustmentMechanismMember
Period of surcharge approved	12 months
Increase in Revenue Requirement, Recoverable through Surcharges			$ 2,300,000awr_IncreaseInRevenueRequirementRecoverableThroughSurcharges / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember / us-gaap_RegulatoryAssetAxis = awr_BaseRevenueRequirementAdjustmentMechanismMember
GSWC | Base revenue requirement adjustment mechanism | Maximum
Regulatory matters:
Alternative revenue program			24 months

X

- Definition

Represents the period of time required for collection of alternative revenue following the year in which the revenue was recorded.

+ References

No definition available.

+ Details

Name:	awr_AlternativeRevenueProgram
Namespace Prefix:	awr_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Represents annual surcharges as a percentage of the last authorized revenue requirement.

+ References

No definition available.

+ Details

Name:	awr_AnnualSurchargesAsPercentageOfLastAuthorizedRevenueRequirement
Namespace Prefix:	awr_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Represents the amount of increase in revenue requirement for difference between the allocated general office costs authorized by the CPUC November 2010 Decision and what was then in rates for allocated general office costs.

+ References

No definition available.

+ Details

Name:	awr_IncreaseInRevenueRequirementRecoverableThroughSurcharges
Namespace Prefix:	awr_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Represents the term associated with a fixed-term security.

+ References

No definition available.

+ Details

Name:	awr_InvestmentTerm
Namespace Prefix:	awr_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Represents the period of surcharge approved by CPUC for amounts collected through December 2013 to be applied to 2011.

+ References

No definition available.

+ Details

Name:	awr_PeriodOfSurchargeApproved
Namespace Prefix:	awr_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Represents the recovery period for under-collection balances greater than 15 percent of adopted annual revenues.

+ References

No definition available.

+ Details

Name:	awr_RecoveryPeriodForUnderCollectionBalancesGreaterThan15PercentOfAdoptedAnnualRevenues
Namespace Prefix:	awr_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Represents the recovery period for under-collection balances that are up to 15 percent of adopted annual revenues.

+ References

No definition available.

+ Details

Name:	awr_RecoveryPeriodForUnderCollectionBalancesThatAreUpTo15PercentOfAdoptedAnnualRevenues
Namespace Prefix:	awr_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Represents amount billed to customers as surcharges.

+ References

No definition available.

+ Details

Name:	awr_RegulatoryAssetAmountBilledToCustomersAsSurcharges
Namespace Prefix:	awr_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Details

Name:	awr_RegulatoryAssetsAndLiabilitiesLineItems
Namespace Prefix:	awr_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Represents the under-collection balances as a percentage of adopted annual revenues.

+ References

No definition available.

+ Details

Name:	awr_UnderCollectionBalancesAsPercentageOfAdoptedAnnualRevenues
Namespace Prefix:	awr_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The increase (decrease) during the reporting period in the value of other assets that are created when regulatory agencies permits public utilities to defer costs to the balance sheet.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 28

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585

+ Details

Name:	us-gaap_IncreaseDecreaseInOtherRegulatoryAssets
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

The net amount of all regulatory assets less all regulatory liabilities as of the end of the period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 980

-SubTopic 340

-Section 50

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6499975&loc=d3e44250-110382

+ Details

Name:	us-gaap_NetRegulatoryAssets
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Details

Name:	dei_LegalEntityAxis=awr_GoldenStateWaterCompanyMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_RegulatoryAssetAxis=awr_WaterRevenueAdjustmentMechanismMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: