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Regulatory Matters: BVES General Rate Case and Renewables Portfolio Standard (Details) (GSWC, USD $) In Thousands, unless otherwise specified			6 Months Ended
	Jun. 30, 2014	Dec. 31, 2013	Jun. 30, 2014 BVES General Rate Case
Regulatory matters:
Net regulatory assets	$ 113,305	$ 122,681
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 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

Name:	awr_PercentageOfDeferredRateCostsRequiredToBeWrittenOffIfDRAPrevails
Namespace Prefix:	awr_
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X

- Details

Name:	awr_RegulatoryAssetsAndLiabilitiesLineItems
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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