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Business Segments: (Details 2) (USD $) In Thousands, unless otherwise specified | Mar. 31, 2015 | Dec. 31, 2014 | Mar. 31, 2014
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Details of reportable segment |  |  |
Total utility plant | $ 1,007,563 us-gaap_PropertyPlantAndEquipmentNet | $ 1,003,520 us-gaap_PropertyPlantAndEquipmentNet | $ 983,929 us-gaap_PropertyPlantAndEquipmentNet
Other assets | 359,857 awr_AssetsOtherThanPropertyPlantAndEquipmentNet |  | 349,842 awr_AssetsOtherThanPropertyPlantAndEquipmentNet
Total Assets | 1,367,420 us-gaap_Assets | 1,378,298 us-gaap_Assets | 1,333,771 us-gaap_Assets
GOLDEN STATE WATER COMPANY |  |  |
Details of reportable segment |  |  |
Total utility plant | 1,003,141 us-gaap_PropertyPlantAndEquipmentNet / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember | 998,880 us-gaap_PropertyPlantAndEquipmentNet / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember |
Total Assets | $ 1,281,445 us-gaap_Assets / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember | $ 1,282,374 us-gaap_Assets / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember |

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- Definition Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.18) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 12 -Article 7 + Details
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- Definition Amount after accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business to produce goods and services and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.13) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 13 -Subparagraph a -Article 5 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 8 -Article 7 + Details
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