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Regulatory Matters 6 (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2020 USD ($) unit	Dec. 31, 2019 USD ($)
Regulatory matters:
Net regulatory assets	$ 16,539	$ (2,450)
Bear Valley Electric Service, Inc.
Regulatory matters:
Number of renewable energy credits that would be purchased | unit	578,000
Bear Valley Electric Service, Inc. | Renewables Portfolio Standard [Member]
Regulatory matters:
Derivative, Term of Contract	ten
GSWC
Regulatory matters:
Net regulatory assets	$ 12,373	(2,450)
Various refunds to customers | GSWC
Regulatory matters:
Net regulatory assets	$ (4,577)	$ (8,478)

X

- Definition

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

+ References

No definition available.

+ Details

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Namespace Prefix:	awr_
Data Type:	us-types:durationStringItemType
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

- Definition

-- None. No documentation exists for this element. --

+ References

No definition available.

+ Details

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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://fasb.org/us-gaap/role/ref/legacyRef
-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

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

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

X

- Details

Name:	us-gaap_RegulatoryLiabilityAxis=us-gaap_RevenueSubjectToRefundMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: