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Allowance for Doubtful Accounts (Tables) | 3 Months Ended
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Mar. 31, 2020
Allowance for Doubtful Accounts [Abstract] |
Schedule of provision for doubtful accounts charged to expense and accounts written off, net of recoveries | The table below presents Registrant’s provision for doubtful accounts charged to expense and accounts written off, net of recoveries.
|  | Three Months Ended March 31, 2020
(dollars in thousands) |  | AWR |  | GSWC
Balances at December 31, 2019 |  | $ | 916 |  |  | $ | 916 |
Increase to provision |  | 393 |  |  | 393 |
Accounts written off, net of recoveries |  | (164 | ) |  | (164 | )
Balances at March 31, 2020 |  | $ | 1,145 |  |  | $ | 1,145 |
Allowance for doubtful accounts related to accounts receivable-customer |  | $ | 1,086 |  |  | $ | 1,086 |
Allowance for doubtful accounts related to receivable from U.S. government |  | — |  |  | — |
Allowance for doubtful accounts related to other accounts receivable |  | 59 |  |  | 59 |
Total allowance for doubtful accounts |  | $ | 1,145 |  |  | $ | 1,145 |

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- Definition Tabular disclosure of the allowance for doubtful accounts of the entity. + References No definition available. + Details
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Namespace Prefix: | awr_
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- Definition Allowance for Doubtful Accounts [Abstract] + References No definition available. + Details
Name: | awr_AllowanceforDoubtfulAccountsAbstract
Namespace Prefix: | awr_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration