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Regulatory Matters: (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020
Regulatory matters:
Regulatory asset not accruing carrying costs	$ (22,900)
Regulatory assets	(18,263)		$ (16,539)
Pension and other post-retirement obligations
Regulatory matters:
Regulatory asset not accruing carrying costs	(65,400)
Deferred Income Tax Charge
Regulatory matters:
Regulatory asset not accruing carrying costs	(78,000)
Flow-through taxes, net
Regulatory matters:
Regulatory asset not accruing carrying costs	(9,700)
Water Revenue Adjustment Mechanism and Modified Cost Balancing Account
Regulatory matters:
Increase (Decrease) in Other Regulatory Assets	4,700
Derivative unrealized (gain) loss
Regulatory matters:
Regulatory asset not accruing carrying costs	(1,200)
Bear Valley Electric Service, Inc.
Regulatory matters:
Regulatory asset CEMA - Storm	455
Bear Valley Electric Service, Inc. | Other Regulatory Assets Net [Member]
Regulatory matters:
Regulatory assets	(3,257)		(2,629)
Bear Valley Electric Service, Inc. | Derivative unrealized (gain) loss
Regulatory matters:
Regulatory assets	1,224		(1,537)
Golden State Water Company
Regulatory matters:
Regulatory assets	(16,230)		(12,373)
Golden State Water Company | Revenue Subject to Refund [Member]
Regulatory matters:
Regulatory assets	4,527		4,577
Golden State Water Company | Costs deferred for future recovery on Aerojet case
Regulatory matters:
Regulatory assets	(6,544)		(6,751)
Golden State Water Company | Pension and other post-retirement obligations
Regulatory matters:
Regulatory assets	(64,693)		(65,576)
Golden State Water Company | Catastrophic Event Memo Account (CEMA) [Member]
Regulatory matters:
Regulatory assets	(5,140)		(4,119)
Golden State Water Company | Deferred Income Tax Charge
Regulatory matters:
Regulatory assets	73,926		74,185
Golden State Water Company | Flow-through taxes, net
Regulatory matters:
Regulatory assets	9,013		9,722
Golden State Water Company | Other Regulatory Assets Net [Member]
Regulatory matters:
Regulatory assets	(10,739)		(10,670)
Golden State Water Company | Water Revenue Adjustment Mechanism and Modified Cost Balancing Account
Regulatory matters:
Amount billed to customers as surcharges	1,900	$ 2,200
Regulatory assets	(16,580)		$ (13,741)
Golden State Water Company | Water Revenue Adjustment Mechanism [Member]
Regulatory matters:
Regulatory assets	(1,400)
Golden State Water Company and Bear Valley Electric Service Inc.
Regulatory matters:
Regulatory asset-CEMA	$ 5,700
Maximum [Member] | Golden State Water Company | Water Revenue Adjustment Mechanism and Modified Cost Balancing Account
Regulatory matters:
Regulatory Asset Recovery Periods	24 months
Minimum [Member] | Golden State Water Company | Water Revenue Adjustment Mechanism and Modified Cost Balancing Account
Regulatory matters:
Regulatory Asset Recovery Periods	12 months

X

- Definition

Represents amount billed to customers as surcharges.

+ References

No definition available.

+ Details

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Namespace Prefix:	awr_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Regulatory asset-Catastrophic Event Memo Account (CEMA)

+ References

No definition available.

+ Details

Name:	awr_RegulatoryAssetCEMA
Namespace Prefix:	awr_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Regulatory asset CEMA - Storm

+ References

No definition available.

+ Details

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Namespace Prefix:	awr_
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Balance Type:	debit
Period Type:	instant

X

- Definition

Represents the regulatory asset not accruing carrying costs as of the balance sheet date.

+ References

No definition available.

+ Details

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Namespace Prefix:	awr_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

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

+ References

No definition available.

+ Details

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Namespace Prefix:	awr_
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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 increase (decrease) during the reporting period in the value of other assets that are created when regulatory agencies permits public utilities to defer costs to the balance sheet.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3602-108585

+ 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://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

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- Details

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Period Type:

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- Details

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Balance Type:
Period Type:

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- Details

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- Details

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Period Type:

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- Details

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- Details

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- Details

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- Details

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- Details

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- Details

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- Details

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