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

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- 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

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- 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

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