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Regulatory Matters (Details 6) (USD $)	12 Months Ended		3 Months Ended
	Dec. 31, 2013	Dec. 31, 2010	Sep. 30, 2013	Dec. 31, 2014
General rate case memorandum accounts
Regulatory matters:
Effect of retroactive increase in rate	$ 600,000awr_EffectofRetroactiveIncreaseinRate / us-gaap_RegulatoryAssetAxis = awr_GeneralRateCaseMemorandumAccountsMember	$ 4,100,000awr_EffectofRetroactiveIncreaseinRate / us-gaap_RegulatoryAssetAxis = awr_GeneralRateCaseMemorandumAccountsMember
GSWC
Regulatory matters:
Net regulatory assets	122,681,000us-gaap_NetRegulatoryAssets / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember			125,704,000us-gaap_NetRegulatoryAssets / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember
GSWC | General rate case memorandum accounts
Regulatory matters:
Net regulatory assets	$ 15,645,000us-gaap_NetRegulatoryAssets / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember / us-gaap_RegulatoryAssetAxis = awr_GeneralRateCaseMemorandumAccountsMember			$ 4,731,000us-gaap_NetRegulatoryAssets / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember / us-gaap_RegulatoryAssetAxis = awr_GeneralRateCaseMemorandumAccountsMember
Regulatory Asset Recovery Periods			12 months
Minimum | GSWC | General rate case memorandum accounts
Regulatory matters:
Regulatory Asset Recovery Periods			12 months
Maximum | GSWC | General rate case memorandum accounts
Regulatory matters:
Regulatory Asset Recovery Periods			24 months

X

- Definition

Effect of Retroactive Increase in Rate

+ References

No definition available.

+ Details

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X

- Definition

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

+ References

No definition available.

+ Details

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- Details

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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

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- Details

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