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Regulatory Matters 5 (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Regulatory matters:
Regulatory asset	$ 2,700
GSWC
Regulatory matters:
Total	(2,450)	$ (28,340)
GSWC | Revenue Subject to Refund for TCJA [Member]
Regulatory matters:
Adjustments recorded to revalue deferred taxes as a result of the tax cut and job act of 2017 impact		7,100
GSWC | Pension Costs and Other Postretirement Benefit Costs
Regulatory matters:
Regulatory asset	43,400
Total	40,693	33,124
GSWC | General Rate Case Memorandum Accounts [Member]
Regulatory matters:
Total	$ 4,820	$ 5,054
Maximum [Member] | GSWC | General Rate Case Memorandum Accounts [Member]
Regulatory matters:
Regulatory Asset Recovery Periods	36 months
Minimum | GSWC | General Rate Case Memorandum Accounts [Member]
Regulatory matters:
Regulatory Asset Recovery Periods	12 months

X

- Definition

Adjustments recorded to revalue deferred taxes as a result of the tax cut and job act of 2017 impact

+ References

No definition available.

+ Details

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

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_
Data Type:	xbrli:durationItemType
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

- Definition

The amount for the individual regulatory asset as itemized in a table of regulatory assets 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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- Details

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Namespace Prefix:
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- Details

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- Details

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- Details

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- Details

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