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Regulatory Matters (Details 9) (GSWC, USD $) In Thousands, unless otherwise specified	1 Months Ended
	Dec. 31, 2012 renewable_energy	Dec. 31, 2014	Dec. 31, 2013
Regulatory matters:
Net regulatory assets		$ 125,704us-gaap_NetRegulatoryAssets	$ 122,681us-gaap_NetRegulatoryAssets
Renewables Portfolio Standard
Regulatory matters:
Agreement period to purchase renewable energy credits	10 years
Number of renewable energy credits that would be purchased	582,000awr_PurchasedRenewableEnergyCreditsNumber / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember / us-gaap_RegulatoryAssetAxis = awr_RenewablesPortfolioStandardMember

X

- Definition

Represents the period of agreement with a third party to purchase renewable energy credits.

+ References

No definition available.

+ Details

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

X

- Definition

Represents the number of renewable energy credits that would be purchased over a contractual period of time.

+ References

No definition available.

+ Details

Name:	awr_PurchasedRenewableEnergyCreditsNumber
Namespace Prefix:	awr_
Data Type:	xbrli:integerItemType
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

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