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Commitments (Details 3) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014 MW
Water Purchase Commitments [Member] | GSWC
Purchase commitments
Total commitment under agreement	5,264us-gaap_PurchaseObligation / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember / us-gaap_PurchaseCommitmentExcludingLongtermCommitmentAxis = awr_WaterPurchaseCommitmentsMember
Bear Valley Electric | GSWC
Purchase commitments
Average load at customer service area (in MWs)	11awr_AverageLoadAtCustomerServiceAreaNumberOfMegawatts / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember / us-gaap_PurchaseCommitmentExcludingLongtermCommitmentAxis = awr_ElectricPowerPurchaseCommitmentsMember
Average winter load (in MWs)	20awr_AverageWinterLoadNumberOfMegawatts / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember / us-gaap_PurchaseCommitmentExcludingLongtermCommitmentAxis = awr_ElectricPowerPurchaseCommitmentsMember
Winter peak load (in MWs)	45awr_WinterPeakLoadNumberOfMegawatts / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember / us-gaap_PurchaseCommitmentExcludingLongtermCommitmentAxis = awr_ElectricPowerPurchaseCommitmentsMember
Maximum capacity fo natural gas-fuled generation facility (in megawatts)	8.4awr_NaturalGasFueledGenerationFacilityMaximumCapacity / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember / us-gaap_PurchaseCommitmentExcludingLongtermCommitmentAxis = awr_ElectricPowerPurchaseCommitmentsMember
Bear Valley Electric | Electric Service Utility Operations [Member]
Purchase commitments
Total commitment under agreement	31,100us-gaap_PurchaseObligation / dei_LegalEntityAxis = awr_ElectricServiceUtilityOperationsMember / us-gaap_PurchaseCommitmentExcludingLongtermCommitmentAxis = awr_ElectricPowerPurchaseCommitmentsMember

X

- Definition

Represents the average load at customer service area.

+ References

No definition available.

+ Details

Name:	awr_AverageLoadAtCustomerServiceAreaNumberOfMegawatts
Namespace Prefix:	awr_
Data Type:	num:powerItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Represents the average winter load.

+ References

No definition available.

+ Details

Name:	awr_AverageWinterLoadNumberOfMegawatts
Namespace Prefix:	awr_
Data Type:	num:powerItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Represents the maximum capacity provided by a natural gas-fueled generation facility.

+ References

No definition available.

+ Details

Name:	awr_NaturalGasFueledGenerationFacilityMaximumCapacity
Namespace Prefix:	awr_
Data Type:	num:powerItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Represents the winter peak load when the snowmaking machines at the ski resorts are operating.

+ References

No definition available.

+ Details

Name:	awr_WinterPeakLoadNumberOfMegawatts
Namespace Prefix:	awr_
Data Type:	num:powerItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	us-gaap_PurchaseCommitmentExcludingLongtermCommitmentLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- 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

Name:	us-gaap_PurchaseObligation
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Details

Name:	us-gaap_PurchaseCommitmentExcludingLongtermCommitmentAxis=awr_ElectricPowerPurchaseCommitmentsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_PurchaseCommitmentExcludingLongtermCommitmentAxis=awr_WaterPurchaseCommitmentsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: