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Commitments (Details 2) (GSWC, Water Supply, USD $)	Dec. 31, 2014
Estimated future minimum payments
2014	$ 447,000us-gaap_PurchaseObligationDueInNextTwelveMonths
2015	319,000us-gaap_PurchaseObligationDueInSecondYear
2016	319,000us-gaap_PurchaseObligationDueInThirdYear
2017	319,000us-gaap_PurchaseObligationDueInFourthYear
2018	319,000us-gaap_PurchaseObligationDueInFifthYear
Thereafter	3,541,000us-gaap_PurchaseObligationDueAfterFifthYear
Total	5,264,000us-gaap_PurchaseObligation
City of Claremont
Purchase commitments
Remaining amount of commitment	3,100,000us-gaap_PurchaseCommitmentRemainingMinimumAmountCommitted / us-gaap_LeaseArrangementTypeAxis = awr_CityOfClaremontMember / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember / us-gaap_PurchaseCommitmentExcludingLongtermCommitmentAxis = awr_WaterPurchaseCommitmentsMember
Various third parties
Estimated future minimum payments
Total	$ 2,200,000us-gaap_PurchaseObligation / us-gaap_LeaseArrangementTypeAxis = awr_VariousThirdPartiesMember / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember / us-gaap_PurchaseCommitmentExcludingLongtermCommitmentAxis = awr_WaterPurchaseCommitmentsMember

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- Definition

Minimum amount to be expended to satisfy the terms of arrangements in which the entity has agreed to expend funds to procure goods or services, excluding long-term purchase commitments or unconditional purchase obligations.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.25)

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682



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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

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-Paragraph 25

-Article 5



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

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Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

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Reference 5: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.9-03.17)

-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878



Reference 6: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 944

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.7-03.(a)(19))

-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

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- Definition

Minimum amount of purchase arrangement in which the entity has agreed to expend funds to procure goods or services from a supplier.

+ References

No definition available.

+ Details

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- Definition

Minimum amount of purchase arrangement maturing after the fifth fiscal year following the latest fiscal year. Includes, but not limited to, recorded and unrecorded purchase obligations, long-term purchase commitments, and short-term purchase commitments.

+ References

No definition available.

+ Details

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+ References

No definition available.

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- Definition

Minimum amount of purchase arrangement maturing in the fourth fiscal year following the latest fiscal year. Includes, but not limited to, recorded and unrecorded purchase obligations, long-term purchase commitments, and short-term purchase commitments.

+ References

No definition available.

+ Details

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- Definition

Minimum amount of purchase arrangement maturing in the next fiscal year following the latest fiscal year. Includes, but not limited to, recorded and unrecorded purchase obligations, long-term purchase commitments, and short-term purchase commitments.

+ References

No definition available.

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- Definition

Minimum amount of purchase arrangement maturing in the second fiscal year following the latest fiscal year. Includes, but not limited to, recorded and unrecorded purchase obligations, long-term purchase commitments, and short-term purchase commitments.

+ References

No definition available.

+ Details

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- Definition

Minimum amount of purchase arrangement maturing in the third fiscal year following the latest fiscal year. Includes, but not limited to, recorded and unrecorded purchase obligations, long-term purchase commitments, and short-term purchase commitments.

+ References

No definition available.

+ Details

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