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Regulatory Matters (Details) (USD $) | Dec. 31, 2013 | Dec. 31, 2012
--- | --- | ---
Regulatory matters: |  |
Regulatory asset not accruing carrying costs | $ 37,200,000 |
Flow-through taxes, net |  |
Regulatory matters: |  |
Regulatory asset not accruing carrying costs | 16,200,000 |
GOLDEN STATE WATER COMPANY |  |
Regulatory matters: |  |
Total | 122,681,000 | 176,015,000
GOLDEN STATE WATER COMPANY | Various refunds to customers |  |
Regulatory matters: |  |
Total | (4,292,000) | (7,558,000)
GOLDEN STATE WATER COMPANY | WRAM, net of MCBA |  |
Regulatory matters: |  |
Total | (16,345,000) | 42,574,000
GOLDEN STATE WATER COMPANY | Base revenue requirement adjustment mechanism |  |
Regulatory matters: |  |
Total | 8,725,000 | 6,833,000
GOLDEN STATE WATER COMPANY | Costs deferred for future recovery on Aerojet case |  |
Regulatory matters: |  |
Total | 14,763,000 | 16,030,000
GOLDEN STATE WATER COMPANY | Pension and other post-retirement obligations |  |
Regulatory matters: |  |
Total | 20,241,000 | 56,894,000
GOLDEN STATE WATER COMPANY | Derivative unrealized loss |  |
Regulatory matters: |  |
Total | 0 | 3,060,000
GOLDEN STATE WATER COMPANY | Flow-through taxes, net |  |
Regulatory matters: |  |
Total | 16,189,000 | 16,415,000
GOLDEN STATE WATER COMPANY | Low income rate assistance balancing accounts |  |
Regulatory matters: |  |
Total | 9,979,000 | 9,119,000
GOLDEN STATE WATER COMPANY | General rate case memorandum accounts |  |
Regulatory matters: |  |
Total | 15,645,000 | 4,495,000
GOLDEN STATE WATER COMPANY | Other regulatory assets, net |  |
Regulatory matters: |  |
Total | $ 25,086,000 | $ 28,153,000

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- Definition Represents the regulatory asset not accruing carrying costs as of the balance sheet date. + References No definition available. + Details
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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