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Dividend Limitations (Details) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Dividend limitations
Retained Earnings (Accumulated Deficit)	$ 238,443,000	$ 205,257,000
GSWC
Dividend limitations
Fixed amount in computing maximum ability to pay dividends	21,000,000.0
Percentage of consolidated net income plus the aggregate net cash proceeds received from capital stock offerings or other instruments convertible into capital stock	100.00%
Amount available to pay dividends under the most restrictive of the Note Agreements	371,900,000
Dividends paid	29,400,000	10,200,000	20,000,000
Retained Earnings (Accumulated Deficit)		184,777,000
GSWC | Maximum
Dividend limitations
Indebtedness to capitalization ratio	0.6667
Retained Earnings (Accumulated Deficit)	203,892,000
AWR
Dividend limitations
Dividends paid		16,900,000	20,000,000
Retained Earnings (Accumulated Deficit)	238,443,000
ASUS
Dividend limitations
Dividends paid		6,700,000
ASUS | Maximum
Dividend limitations
Amount available to pay dividends	$ 29,000,000

X

- Definition

The amount of dividends that may be paid or declared in any calendar year under terms of debt covenants.

+ References

No definition available.

+ Details

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

X

- Definition

Represents the maximum fixed amount added to the variable portion of the total dividend limitation ceiling as defined by debt covenants.

+ References

No definition available.

+ Details

Name:	awr_DebtCovenantDividendLimitationsFixedAmount
Namespace Prefix:	awr_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Represents the percentage of consolidated net income added to the fixed portion of the total dividend limitation ceiling as defined by debt covenants.

+ References

No definition available.

+ Details

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

X

- Details

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X

- Definition

Cash outflow from subsidiaries in the form of capital distributions and dividends to common shareholders, preferred shareholders and noncontrolling interests.

+ References

No definition available.

+ Details

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

X

- Definition

Indebtedness divided by net capital.

+ References

No definition available.

+ Details

Name:	us-gaap_RatioOfIndebtednessToNetCapital1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:pureItemType
Balance Type:	na
Period Type:	instant

X

- Definition

The cumulative amount of the reporting entity's undistributed earnings or deficit.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher AICPA

-Name Accounting Principles Board Opinion (APB)

-Number 12

-Paragraph 10

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 31

-Article 5



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 04

-Article 3



Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.31(a)(3))

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

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Namespace Prefix:	us-gaap_
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Balance Type:	credit
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X

- Definition

Amount available as of the balance sheet date for dividend payments after computation of statutory restrictions on capital surplus.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 60

-Paragraph 60

-Subparagraph h

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 944

-SubTopic 505

-Section 50

-Paragraph 1

-Subparagraph (c)

-URI http://asc.fasb.org/extlink&oid=6486098&loc=d3e24708-158529

+ Details

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