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Regulatory Matters: (Details) - USD ($) $ in Thousands | Mar. 31, 2016 | Dec. 31, 2015
--- | --- | ---
Regulatory matters: |  |
Regulatory asset not accruing carrying costs | $ 54,000 |
Pension and other post-retirement obligations |  |
Regulatory matters: |  |
Regulatory asset not accruing carrying costs | 23,700 |
Derivative unrealized loss |  |
Regulatory matters: |  |
Regulatory asset not accruing carrying costs | 7,200 |
Flow-through taxes, net |  |
Regulatory matters: |  |
Regulatory asset not accruing carrying costs | 16,600 |
GOLDEN STATE WATER COMPANY |  |
Regulatory matters: |  |
Regulatory assets | 144,198 | $ 132,696
GOLDEN STATE WATER COMPANY | Water Revenue Adjustment Mechanism, net of Modified Cost Balancing Account |  |
Regulatory matters: |  |
Regulatory assets | 53,948 | 45,171
GOLDEN STATE WATER COMPANY | Costs deferred for future recovery on Aerojet case |  |
Regulatory matters: |  |
Regulatory assets | 12,567 | 12,699
GOLDEN STATE WATER COMPANY | Pension and other post-retirement obligations |  |
Regulatory matters: |  |
Regulatory assets | 25,538 | 21,996
GOLDEN STATE WATER COMPANY | Derivative unrealized loss |  |
Regulatory matters: |  |
Regulatory assets | 7,245 | 7,053
GOLDEN STATE WATER COMPANY | Flow-through taxes, net |  |
Regulatory matters: |  |
Regulatory assets | 16,551 | 16,176
GOLDEN STATE WATER COMPANY | Low income rate assistance balancing accounts |  |
Regulatory matters: |  |
Regulatory assets | 8,810 | 8,699
GOLDEN STATE WATER COMPANY | Other regulatory assets |  |
Regulatory matters: |  |
Regulatory assets | 25,298 | 25,668
Various refunds to customers | GOLDEN STATE WATER COMPANY |  |
Regulatory matters: |  |
Regulatory assets | $ (5,759) | $ (4,766)

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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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- Definition -- None. No documentation exists for this element. -- + References No definition available. + 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
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
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- Details
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- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
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- Details
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- Details
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Namespace Prefix: |
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Balance Type: |
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- Details
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- Details
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Namespace Prefix: |
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- Details
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