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CONSOLIDATED BALANCE SHEETS (Parenthetical) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Accounts receivable - customers, allowance for doubtful accounts	$ 717us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent	$ 803us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent
Other accounts receivable, allowance for doubtful accounts	112awr_AllowanceForDoubtfulAccountsReceivableOtherCurrent	89awr_AllowanceForDoubtfulAccountsReceivableOtherCurrent
GOLDEN STATE WATER COMPANY
Accounts receivable - customers, allowance for doubtful accounts	717us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember	803us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember
Other accounts receivable, allowance for doubtful accounts	$ 112awr_AllowanceForDoubtfulAccountsReceivableOtherCurrent / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember	$ 89awr_AllowanceForDoubtfulAccountsReceivableOtherCurrent / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember

X

- Definition

This element represents the valuation allowance for other receivables not separately presented elsewhere in the balance sheet, within one year (or the normal operating cycle, whichever is longer) that are expected to be uncollectible.

+ References

No definition available.

+ Details

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

X

- Definition

A valuation allowance for trade and other receivables due to an Entity within one year (or the normal operating cycle, whichever is longer) that are expected to be uncollectible.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

-Paragraph 4

-URI http://asc.fasb.org/extlink&oid=49124121&loc=d3e5074-111524



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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.4)

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

+ Details

Name:	us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Details

Name:	dei_LegalEntityAxis=awr_GoldenStateWaterCompanyMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: