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Regulatory Matters: (Details 3) (GSWC, USD $) |  |  | 6 Months Ended |  | 3 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | ---
Jun. 30, 2013 | Dec. 31, 2012 | Jun. 30, 2013 General rate case memorandum accounts item | Dec. 31, 2012 General rate case memorandum accounts | Mar. 31, 2013 Other regulatory assets, net | Jun. 30, 2013 Other regulatory assets, net | Dec. 31, 2012 Other regulatory assets, net
Regulatory matters: |  |  |  |  |  |  |
Regulatory assets | $ 184,893,000 | $ 176,015,000 | $ 17,239,000 | $ 4,495,000 |  | $ 40,393,000 | $ 40,332,000
Number of water regions |  |  | 3 |  |  |  |
Increase (decrease) to net regulatory assets due to settlement of rate case during the period |  |  | $ 13,100,000 |  | $ 3,200,000 |  |

X
- Definition Represents the amount of increase or decrease to net regulatory assets due to settlement of rate case during the period. + References No definition available. + Details
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Namespace Prefix: | awr_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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- Definition Represents the number of water regions. + References No definition available. + Details
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Namespace Prefix: | awr_
Data Type: | xbrli:integerItemType
Balance Type: | na
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- Details
Name: | awr_RegulatoryAssetsAndLiabilitiesLineItems
Namespace Prefix: | awr_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The net amount of all regulatory assets less all regulatory liabilities as of the end of the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 980 -SubTopic 340 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6499975&loc=d3e44250-110382 + Details
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