XML 42 R29.htm IDEA: XBRL DOCUMENT
v3.10.0.1

Regulatory Matters: CPUC Rehearing Matter and Procurement Audits (Details) - Golden State Water Company - USD ($) $ in Thousands | Sep. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Regulatory matters: |  |
Net Regulatory Assets | $ (21,636) | $ 2,042
Water Revenue Adjustment Mechanism [Member] |  |
Regulatory matters: |  |
Net Regulatory Assets | 3,400 |
General rate case memorandum accounts |  |
Regulatory matters: |  |
Net Regulatory Assets | $ 6,798 | $ 10,522

X
- 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

X
- 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

X
- Details
Name: | dei_LegalEntityAxis=awr_GoldenStateWaterCompanyMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RegulatoryAssetAxis=awr_WaterRevenueAdjustmentMechanismMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RegulatoryAssetAxis=awr_GeneralRateCaseMemorandumAccountsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |