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Regulatory Matters: (Details) (USD $) | Jun. 30, 2013 | May 31, 2013 | Dec. 31, 2012
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Regulatory matters: |  |  |
Regulatory asset not accruing carrying costs | $ 74,300,000 |  |
Pension and other post-retirement obligations |  |  |
Regulatory matters: |  |  |
Regulatory asset not accruing carrying costs | 50,700,000 |  |
Flow-through taxes, net |  |  |
Regulatory matters: |  |  |
Regulatory asset not accruing carrying costs | 15,300,000 |  |
Memorandum account to track unrealized gains and losses on purchase power contracts |  |  |
Regulatory matters: |  |  |
Regulatory asset not accruing carrying costs | 1,100,000 |  |
GOLDEN STATE WATER COMPANY |  |  |
Regulatory matters: |  |  |
Regulatory assets | 184,893,000 |  | 176,015,000
GOLDEN STATE WATER COMPANY | Various refunds to customers |  |  |
Regulatory matters: |  |  |
Regulatory assets | (5,760,000) |  | (7,558,000)
GOLDEN STATE WATER COMPANY | Water Revenue Adjustment Mechanism, net of Modified Cost Balancing Account |  |  |
Regulatory matters: |  |  |
Regulatory assets | 38,003,000 |  | 42,574,000
GOLDEN STATE WATER COMPANY | Base Revenue Requirement Adjustment Mechanism |  |  |
Regulatory matters: |  |  |
Regulatory assets | 8,265,000 | 2,300,000 | 6,833,000
GOLDEN STATE WATER COMPANY | Costs deferred for future recovery on Aerojet case |  |  |
Regulatory matters: |  |  |
Regulatory assets | 15,577,000 |  | 16,030,000
GOLDEN STATE WATER COMPANY | Pension and other post-retirement obligations |  |  |
Regulatory matters: |  |  |
Regulatory assets | 55,836,000 |  | 56,894,000
GOLDEN STATE WATER COMPANY | Flow-through taxes, net |  |  |
Regulatory matters: |  |  |
Regulatory assets | 15,340,000 |  | 16,415,000
GOLDEN STATE WATER COMPANY | General rate case memorandum accounts |  |  |
Regulatory matters: |  |  |
Regulatory assets | 17,239,000 |  | 4,495,000
GOLDEN STATE WATER COMPANY | Other regulatory assets |  |  |
Regulatory matters: |  |  |
Regulatory assets | $ 40,393,000 |  | $ 40,332,000

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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