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Regulatory Matters: (Details) (USD $) | Sep. 30, 2014 | Dec. 31, 2013
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Regulatory matters: |  |
Regulatory asset not accruing carrying costs | $ 35,500,000 |
Pension and other post-retirement obligations |  |
Regulatory matters: |  |
Regulatory asset not accruing carrying costs | 14,900,000 |
Flow-through taxes, net |  |
Regulatory matters: |  |
Regulatory asset not accruing carrying costs | 16,200,000 |
GOLDEN STATE WATER COMPANY |  |
Regulatory matters: |  |
Regulatory assets | 103,616,000 | 122,681,000
GOLDEN STATE WATER COMPANY | Water Revenue Adjustment Mechanism, net of Modified Cost Balancing Account |  |
Regulatory matters: |  |
Regulatory assets | 13,987,000 | 16,345,000
GOLDEN STATE WATER COMPANY | Base Revenue Requirement Adjustment Mechanism |  |
Regulatory matters: |  |
Regulatory assets | 10,100,000 | 8,725,000
GOLDEN STATE WATER COMPANY | Costs deferred for future recovery on Aerojet case |  |
Regulatory matters: |  |
Regulatory assets | 13,906,000 | 14,763,000
GOLDEN STATE WATER COMPANY | Pension and other post-retirement obligations |  |
Regulatory matters: |  |
Regulatory assets | 18,142,000 | 20,241,000
GOLDEN STATE WATER COMPANY | Flow-through taxes, net |  |
Regulatory matters: |  |
Regulatory assets | 16,203,000 | 16,189,000
GOLDEN STATE WATER COMPANY | Low income rate assistance balancing accounts |  |
Regulatory matters: |  |
Regulatory assets | 9,218,000 | 9,979,000
GOLDEN STATE WATER COMPANY | General rate case memorandum accounts |  |
Regulatory matters: |  |
Regulatory assets | 6,171,000 | 15,645,000
GOLDEN STATE WATER COMPANY | Other regulatory assets |  |
Regulatory matters: |  |
Regulatory assets | 18,216,000 | 25,086,000
Various refunds to customers | GOLDEN STATE WATER COMPANY |  |
Regulatory matters: |  |
Regulatory assets | $ (2,348,000) | $ (4,292,000)

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- Definition Represents the regulatory asset not accruing carrying costs as of the balance sheet date. + References No definition available. + Details
Name: | awr_RegulatoryAssetNotAccruingCarryingCosts
Namespace Prefix: | awr_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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

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- 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
Name: | us-gaap_NetRegulatoryAssets
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant