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Regulatory Matters: BVES General Rate Case and Renewables Portfolio Standard (Details) (GSWC, USD $)			1 Months Ended	3 Months Ended
	Mar. 31, 2014	Dec. 31, 2013	Aug. 31, 2012 BVES General Rate Case	Mar. 31, 2014 BVES General Rate Case
Regulatory matters:
Amount of retroactive ratemaking proposal included in DRA's recommendation to increase accumulated depreciation			$ 2,000,000
Net regulatory assets	$ 119,650,000	$ 122,681,000		$ 1,600,000
Portion of deferred rate case costs required to be written off, if DRA prevails				50.00%
Percentage of deferred rate case cost to be borne by shareholders				50.00%

X

- Definition

Represents the amount of retroactive ratemaking proposal included in DRA's recommendation to increase accumulated depreciation.

+ References

No definition available.

+ Details

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X

- Definition

Represents the portion of deferred rate case cost borne by shareholders.

+ References

No definition available.

+ Details

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X

- Definition

Represents the portion of deferred rate case costs required to be written off, if DRA prevails.

+ References

No definition available.

+ Details

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Namespace Prefix:	awr_
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X

- 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://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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