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Allowance for Doubtful Accounts (Details) - USD ($) $ in Thousands | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Changes in allowance for doubtful accounts |  |  |  |  |  |
Balance at beginning of year | $ 764 | $ 944 | $ 892 |  |  |
Provision charged to expense | 989 | 619 | 870 |  |  |
Accounts written off, net of recoveries | 712 | 799 | 818 |  |  |
Balance at end of year | 1,041 | 764 | 944 |  |  |
Components of allowance for doubtful accounts |  |  |  |  |  |
Allowance for doubtful accounts related to accounts receivable-customer |  |  |  | $ 806 | $ 702 | $ 790
Allowance for doubtful accounts related to other accounts receivable |  |  |  | 235 | 62 | 154
Total allowance for doubtful accounts | 764 | 944 | 892 | 1,041 | 764 | 944
GSWC |  |  |  |  |  |
Changes in allowance for doubtful accounts |  |  |  |  |  |
Balance at beginning of year | 761 | 919 | 892 |  |  |
Provision charged to expense | 816 | 627 | 845 |  |  |
Accounts written off, net of recoveries | 712 | 785 | 818 |  |  |
Balance at end of year | 865 | 761 | 919 |  |  |
Components of allowance for doubtful accounts |  |  |  |  |  |
Allowance for doubtful accounts related to accounts receivable-customer |  |  |  | 806 | 702 | 790
Allowance for doubtful accounts related to other accounts receivable |  |  |  | 59 | 59 | 129
Total allowance for doubtful accounts | $ 761 | $ 919 | $ 892 | $ 865 | $ 761 | $ 919

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- Definition -- None. No documentation exists for this element. -- + References No definition available. + 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
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Namespace Prefix: | awr_
Data Type: | xbrli:monetaryItemType
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- Definition Represents the provision for doubtful accounts related to other accounts receivable. + References No definition available. + Details
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Namespace Prefix: | awr_
Data Type: | xbrli:monetaryItemType
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- 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

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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
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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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 FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=84173941&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
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- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + Details
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- Details
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