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Regulatory Matters 5 (Details) - GSWC - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Regulatory matters:
Total	$ (28,340)	$ 2,042
Pension Costs and Other Postretirement Benefit Costs
Regulatory matters:
Regulatory asset	36,200
Total	33,124	33,019
Pension Costs and Other Postretirement Benefit Costs | Two-way pension balancing account
Regulatory matters:
Regulatory asset	$ 3,000
Water Revenue Adjustment Mechanism Net of Modified Cost Balancing Account [Member]
Regulatory matters:
Commercial paper, term	90 days
Total	$ 17,763	29,556
Low income rate assistance balancing accounts
Regulatory matters:
Commercial paper, term	90 days
Discount percentage for qualified low-income water customers	15.00%
Discount percentage for qualified low-income electric customers	20.00%
Total	$ 2,784	$ 5,972

X

- Definition

Represents the discount percentage for qualified low-income electric customers.

+ References

No definition available.

+ Details

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Namespace Prefix:	awr_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Represents the discount percentage for qualified low-income water customers.

+ References

No definition available.

+ Details

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Namespace Prefix:	awr_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Represents the term associated with a fixed-term security.

+ References

No definition available.

+ Details

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

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- 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://www.xbrl.org/2003/role/presentationRef
-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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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

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- 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://www.xbrl.org/2003/role/presentationRef
-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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Balance Type:
Period Type:

X

- Details

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Namespace Prefix:
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Balance Type:
Period Type:

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- Details

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- Details

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Balance Type:
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- Details

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Namespace Prefix:
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