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Regulatory Matters: Alternative-Revenue Programs (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016	Dec. 31, 2016	Dec. 31, 2015	Mar. 31, 2017
Regulatory matters:
Regulated Operating Revenue, Water	$ 80,734	$ 81,058	$ 147,138	$ 147,370
WRAM, net of MCBA
Regulatory matters:
Increase (decrease) in other regulatory assets			16,300
GOLDEN STATE WATER COMPANY
Regulatory matters:
Under (over) collection	145,494		145,494		$ 146,281
Regulated Operating Revenue, Water	80,734	81,058	$ 147,138	147,370
GOLDEN STATE WATER COMPANY | WRAM, net of MCBA
Regulatory matters:
Commercial paper, term			90 days
Amount billed to customers as surcharges	9,500	$ 5,000	$ 13,400	$ 6,400
Under (over) collection	48,277		$ 48,277		$ 47,340
GOLDEN STATE WATER COMPANY | WRAM, net of MCBA | Maximum
Regulatory matters:
Regulatory Asset Recovery Periods			24 months
Alternative Revenue Program					24 months	24 months
GOLDEN STATE WATER COMPANY | WRAM
Regulatory matters:
Under (over) collection	30,000		$ 30,000
Deferred Revenue					$ 910	$ 1,400	$ 320
GOLDEN STATE WATER COMPANY | Modified Cost Balancing Account
Regulatory matters:
Under (over) collection	$ 18,300		$ 18,300

X

- Definition

Represents the period of time required for collection of alternative revenue following the year in which the revenue was recorded.

+ References

No definition available.

+ Details

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X

- Definition

Represents the term associated with a fixed-term security.

+ References

No definition available.

+ Details

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X

- Definition

Represents amount billed to customers as surcharges.

+ References

No definition available.

+ Details

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Namespace Prefix:	awr_
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Balance Type:	credit
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X

- Definition

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

+ References

No definition available.

+ Details

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- Definition

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

+ References

No definition available.

+ Details

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X

- Definition

Amount of deferred revenue as of balance sheet date. Deferred revenue represents collections of cash or other assets related to a revenue producing activity for which revenue has not yet been recognized. Generally, an entity records deferred revenue when it receives consideration from a customer before achieving certain criteria that must be met for revenue to be recognized in conformity with GAAP.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 605
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SAB Topic 13.A.3)
-URI http://asc.fasb.org/extlink&oid=65893310&loc=d3e214044-122780

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 605
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SAB Topic 13.A.4(a).Q1)
-URI http://asc.fasb.org/extlink&oid=65893310&loc=d3e214044-122780

+ Details

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Balance Type:	credit
Period Type:	instant

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://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585

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Balance Type:	credit
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- 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

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

The amount of regulated water operating revenues recognized during the period.

+ References

No definition available.

+ 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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