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Regulatory Matters: (Details) (USD $) | Mar. 31, 2014 | Dec. 31, 2013
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Regulatory matters: |  |
Regulatory asset not accruing carrying costs | $ 36,800,000 |
Pension and other post-retirement obligations |  |
Regulatory matters: |  |
Regulatory asset not accruing carrying costs | 15,100,000 |
Flow-through taxes, net |  |
Regulatory matters: |  |
Regulatory asset not accruing carrying costs | 16,300,000 |
GOLDEN STATE WATER COMPANY |  |
Regulatory matters: |  |
Regulatory assets | 119,650,000 | 122,681,000
GOLDEN STATE WATER COMPANY | Water Revenue Adjustment Mechanism, net of Modified Cost Balancing Account |  |
Regulatory matters: |  |
Regulatory assets | 18,077,000 | 16,345,000
GOLDEN STATE WATER COMPANY | Base Revenue Requirement Adjustment Mechanism |  |
Regulatory matters: |  |
Regulatory assets | 9,088,000 | 8,725,000
GOLDEN STATE WATER COMPANY | Costs deferred for future recovery on Aerojet case |  |
Regulatory matters: |  |
Regulatory assets | 14,561,000 | 14,763,000
GOLDEN STATE WATER COMPANY | Pension and other post-retirement obligations |  |
Regulatory matters: |  |
Regulatory assets | 19,452,000 | 20,241,000
GOLDEN STATE WATER COMPANY | Flow-through taxes, net |  |
Regulatory matters: |  |
Regulatory assets | 16,938,000 | 16,189,000
GOLDEN STATE WATER COMPANY | Low income rate assistance balancing accounts |  |
Regulatory matters: |  |
Regulatory assets | 9,992,000 | 9,979,000
GOLDEN STATE WATER COMPANY | General rate case memorandum accounts |  |
Regulatory matters: |  |
Regulatory assets | 12,993,000 | 15,645,000
GOLDEN STATE WATER COMPANY | Other regulatory assets |  |
Regulatory matters: |  |
Regulatory assets | 22,124,000 | 25,086,000
Various refunds to customers | GOLDEN STATE WATER COMPANY |  |
Regulatory matters: |  |
Regulatory assets | $ (3,575,000) | $ (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