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v2.4.1.9

Allowance for Doubtful Accounts (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Changes in allowance for doubtful accounts |  |  |
Balance at beginning of year | $ 1,187 us-gaap_AllowanceForDoubtfulAccountsReceivable | $ 1,228 us-gaap_AllowanceForDoubtfulAccountsReceivable | $ 1,048 us-gaap_AllowanceForDoubtfulAccountsReceivable
Provision charged to expense | 991 awr_ProvisionForDoubtfulAccountsContinuingOperation | 1,145 awr_ProvisionForDoubtfulAccountsContinuingOperation | 1,710 awr_ProvisionForDoubtfulAccountsContinuingOperation
Accounts written off, net of recoveries | 1,286 awr_AllowanceForDoubtfulAccountsReceivableChargeOffsNetOfRecoveries | 1,186 awr_AllowanceForDoubtfulAccountsReceivableChargeOffsNetOfRecoveries | 1,530 awr_AllowanceForDoubtfulAccountsReceivableChargeOffsNetOfRecoveries
Balance at end of year | 892 us-gaap_AllowanceForDoubtfulAccountsReceivable | 1,187 us-gaap_AllowanceForDoubtfulAccountsReceivable | 1,228 us-gaap_AllowanceForDoubtfulAccountsReceivable
Components of allowance for doubtful accounts |  |  |
Allowance for doubtful accounts related to accounts receivable-customer | 803 awr_AllowanceForDoubtfulAccountsRelatedToReceivableFromCustomer | 755 awr_AllowanceForDoubtfulAccountsRelatedToReceivableFromCustomer | 797 awr_AllowanceForDoubtfulAccountsRelatedToReceivableFromCustomer
Allowance for doubtful accounts related to receivable from U.S. government | 0 awr_AllowanceForDoubtfulAccountsRelatedToReceivableFromUSGovernment | 0 awr_AllowanceForDoubtfulAccountsRelatedToReceivableFromUSGovernment | 8 awr_AllowanceForDoubtfulAccountsRelatedToReceivableFromUSGovernment
Allowance for doubtful accounts related to other accounts receivable | 89 awr_AllowanceForDoubtfulAccountsRelatedToOtherAccountsReceivable | 432 awr_AllowanceForDoubtfulAccountsRelatedToOtherAccountsReceivable | 423 awr_AllowanceForDoubtfulAccountsRelatedToOtherAccountsReceivable
Total allowance for doubtful accounts | 892 us-gaap_AllowanceForDoubtfulAccountsReceivable | 1,187 us-gaap_AllowanceForDoubtfulAccountsReceivable | 1,228 us-gaap_AllowanceForDoubtfulAccountsReceivable
GSWC |  |  |
Changes in allowance for doubtful accounts |  |  |
Balance at beginning of year | 1,114 us-gaap_AllowanceForDoubtfulAccountsReceivable / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember | 1,177 us-gaap_AllowanceForDoubtfulAccountsReceivable / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember | 1,005 us-gaap_AllowanceForDoubtfulAccountsReceivable / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember
Provision charged to expense | 1,055 awr_ProvisionForDoubtfulAccountsContinuingOperation / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember | 1,056 awr_ProvisionForDoubtfulAccountsContinuingOperation / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember | 1,668 awr_ProvisionForDoubtfulAccountsContinuingOperation / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember
Accounts written off, net of recoveries | 1,277 awr_AllowanceForDoubtfulAccountsReceivableChargeOffsNetOfRecoveries / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember | 1,119 awr_AllowanceForDoubtfulAccountsReceivableChargeOffsNetOfRecoveries / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember | 1,496 awr_AllowanceForDoubtfulAccountsReceivableChargeOffsNetOfRecoveries / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember
Balance at end of year | 892 us-gaap_AllowanceForDoubtfulAccountsReceivable / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember | 1,114 us-gaap_AllowanceForDoubtfulAccountsReceivable / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember | 1,177 us-gaap_AllowanceForDoubtfulAccountsReceivable / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember
Components of allowance for doubtful accounts |  |  |
Allowance for doubtful accounts related to accounts receivable-customer | 803 awr_AllowanceForDoubtfulAccountsRelatedToReceivableFromCustomer / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember | 755 awr_AllowanceForDoubtfulAccountsRelatedToReceivableFromCustomer / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember | 797 awr_AllowanceForDoubtfulAccountsRelatedToReceivableFromCustomer / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember
Allowance for doubtful accounts related to other accounts receivable | 89 awr_AllowanceForDoubtfulAccountsRelatedToOtherAccountsReceivable / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember | 359 awr_AllowanceForDoubtfulAccountsRelatedToOtherAccountsReceivable / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember | 380 awr_AllowanceForDoubtfulAccountsRelatedToOtherAccountsReceivable / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember
Total allowance for doubtful accounts | $ 892 us-gaap_AllowanceForDoubtfulAccountsReceivable / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember | $ 1,114 us-gaap_AllowanceForDoubtfulAccountsReceivable / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember | $ 1,177 us-gaap_AllowanceForDoubtfulAccountsReceivable / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember

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- Details
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Namespace Prefix: | awr_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Represents the amount of direct write-downs of receivables, net of recoveries, charged against the allowance for doubtful accounts. + References No definition available. + Details
Name: | awr_AllowanceForDoubtfulAccountsReceivableChargeOffsNetOfRecoveries
Namespace Prefix: | awr_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Represents the provision for doubtful accounts related to other accounts receivable. + References No definition available. + Details
Name: | awr_AllowanceForDoubtfulAccountsRelatedToOtherAccountsReceivable
Namespace Prefix: | awr_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Represents the provision for doubtful accounts related to accounts receivable from customers. + References No definition available. + Details
Name: | awr_AllowanceForDoubtfulAccountsRelatedToReceivableFromCustomer
Namespace Prefix: | awr_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Represents the provision for doubtful accounts related to receivable from the U.S. government. + References No definition available. + Details
Name: | awr_AllowanceForDoubtfulAccountsRelatedToReceivableFromUSGovernment
Namespace Prefix: | awr_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Amount of the current period expense charged against continuing operations, the offset which is generally to the allowance for doubtful accounts for the purpose of reducing receivables, including notes receivable, to an amount that approximates their net realizable value (the amount expected to be collected). + References No definition available. + Details
Name: | awr_ProvisionForDoubtfulAccountsContinuingOperation
Namespace Prefix: | awr_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition For an unclassified balance sheet, a valuation allowance for receivables due a company that are expected to be uncollectible. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 4 -Article 5 Reference 2: 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=35738203&loc=d3e5074-111524 Reference 3: 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
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |