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Subsequent Events: (Details)	6 Months Ended
	Jun. 30, 2017
Contracts | ASUS
Subsequent Event [Line Items]
Period of fixed price contracts to operate and maintain the water and/or wastewater systems at various military bases	50 years

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- Definition

Represents the period of fixed price contracts to operate and maintain the water and/or wastewater systems at various military bases.

+ References

No definition available.

+ Details

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

X

- Definition

Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event.

+ References

No definition available.

+ Details

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

X

- Details

Name:	us-gaap_StatementBusinessSegmentsAxis=awr_ContractedServicesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

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- Details

Name:	dei_LegalEntityAxis=awr_AmericanStatesUtilityServicesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: