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Regulatory Matters (Details 4) (GSWC, USD $) In Millions, unless otherwise specified	1 Months Ended	12 Months Ended	1 Months Ended
	Jul. 31, 2005	Dec. 31, 2014	Oct. 31, 2005
Costs deferred for future recovery on Aerojet case
Regulatory matters:
Increase in Revenue Requirement, Recoverable through Surcharges	$ 21.3awr_IncreaseInRevenueRequirementRecoverableThroughSurcharges / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember / us-gaap_RegulatoryAssetAxis = awr_CostsDeferredForFutureRecoveryOnAerojetCaseMember
Recovery period	20 years
Reimbursement to recover costs		17.5us-gaap_ReimbursementRevenue / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember / us-gaap_RegulatoryAssetAxis = awr_CostsDeferredForFutureRecoveryOnAerojetCaseMember
Costs deferred for future recovery on Aerojet case | Maximum
Regulatory matters:
Recovery period			20 years
Water Revenue Adjustment Mechanism Net of Modified Cost Balancing Account [Member]
Regulatory matters:
Amount billed to customers as surcharges		$ 14.3awr_RegulatoryAssetAmountBilledToCustomersAsSurcharges / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember / us-gaap_RegulatoryAssetAxis = awr_WaterRevenueAdjustmentMechanismNetOfModifiedCostBalancingAccountMember

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

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Namespace Prefix:	awr_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
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

- Definition

Represents the recovery periods of the surcharge billed to the customers.

+ References

No definition available.

+ Details

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

X

- Details

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

X

- Definition

Repayment received or receivable for expenses incurred on behalf of a client or customer, other than those reimbursements received by landlords from tenants.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 225

-SubTopic 10

-Section S99

-Paragraph 2

-Subparagraph (SX 210.5-03.1)

-URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 605

-SubTopic 45

-Section 45

-Paragraph 23

-URI http://asc.fasb.org/extlink&oid=21915142&loc=d3e60722-111653

+ Details

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