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Contingencies (Details) (GSWC, USD $) | 12 Months Ended |
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Dec. 31, 2014 customer | Nov. 04, 2014
Environmental Clean-Up and Remediation |  |
Contingencies |  |
Amount spent in clean-up and remediation activities | 4,500,000 us-gaap_EnvironmentalRemediationExpense / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember / us-gaap_LossContingenciesByNatureOfContingencyAxis = us-gaap_EnvironmentalIssueMember |
Amount paid by the State of California Underground Storage Tank Fund for clean-up and remediation of plant facilities | 1,500,000 awr_EnvironmentalLossContingenciesPaidByThirdParty / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember / us-gaap_LossContingenciesByNatureOfContingencyAxis = us-gaap_EnvironmentalIssueMember |
Accrued liability for the estimated additional cost to complete the clean-up at the site | 1,400,000 us-gaap_AccrualForEnvironmentalLossContingencies / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember / us-gaap_LossContingenciesByNatureOfContingencyAxis = us-gaap_EnvironmentalIssueMember |
City of Claremont | Condemnation of Properties |  |
Contingencies |  |
Amount of Water Revenue Bonds Authorized to Finance Acquisition of the System |  | 135,000,000 awr_AmountofWaterRevenueBondsAuthorizedtoFinanceAcquisitionoftheSystem / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember / us-gaap_LitigationCaseAxis = awr_CityOfClaremontMember / us-gaap_LossContingenciesByNatureOfContingencyAxis = awr_CondemnationOfPropertiesMember
Number of customers served through water systems | 11,000 awr_LossContingencyNumberOfCustomersServed / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember / us-gaap_LitigationCaseAxis = awr_CityOfClaremontMember / us-gaap_LossContingenciesByNatureOfContingencyAxis = awr_CondemnationOfPropertiesMember |
Ojai FLOW | Condemnation of Properties |  |
Contingencies |  |
Number of customers served through water systems | 3,000 awr_LossContingencyNumberOfCustomersServed / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember / us-gaap_LitigationCaseAxis = awr_OjaiFLOWMember / us-gaap_LossContingenciesByNatureOfContingencyAxis = awr_CondemnationOfPropertiesMember |
City of Apple Valley [Member] | Condemnation of Properties |  |
Contingencies |  |
Number of customers served through water systems | 2,900 awr_LossContingencyNumberOfCustomersServed / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember / us-gaap_LitigationCaseAxis = awr_CityofAppleValleyMember / us-gaap_LossContingenciesByNatureOfContingencyAxis = awr_CondemnationOfPropertiesMember |
City of Artesia [Member] | Condemnation of Properties |  |
Contingencies |  |
Number of customers served through water systems | 3,300 awr_LossContingencyNumberOfCustomersServed / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember / us-gaap_LitigationCaseAxis = awr_CityofArtesiaMember / us-gaap_LossContingenciesByNatureOfContingencyAxis = awr_CondemnationOfPropertiesMember |
Transmission and distribution | City of Claremont | Condemnation of Properties |  |
Contingencies |  |
Public Utilities, Property, Plant and Equipment, Net | 47,700,000 us-gaap_PublicUtilitiesPropertyPlantAndEquipmentNet / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember / us-gaap_LitigationCaseAxis = awr_CityOfClaremontMember / us-gaap_LossContingenciesByNatureOfContingencyAxis = awr_CondemnationOfPropertiesMember / us-gaap_PublicUtilityAxis = awr_WaterTransmissionAndDistributionMember |

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- Definition Represents the amount of environmental remediation costs paid by the third party. + References No definition available. + Details
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- Definition Total costs accrued as of the balance sheet date for environmental loss contingencies. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 30 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=6393242&loc=d3e13207-110859 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14326-108349 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 25 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6395460&loc=d3e13647-108346 + Details
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- Definition The charge against earnings in the period for known or estimated future costs arising from requirements to perform environmental remediation activities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 30 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=6393242&loc=d3e13296-110859 + Details
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