XML 67 R51.htm IDEA: XBRL DOCUMENT
v3.10.0.1

Regulatory Matters 3 (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Regulatory matters: |  |
Other Liabilities, Current | $ 10,731 | $ 15,109
GSWC |  |
Regulatory matters: |  |
Under (over) collection | (28,340) | 2,042
Other Liabilities, Current | 9,432 | 14,705
Other Regulatory Assets Net [Member] | GSWC |  |
Regulatory matters: |  |
Under (over) collection | 15,656 | 16,393
Low income rate assistance balancing accounts | GSWC |  |
Regulatory matters: |  |
Under (over) collection | 2,784 | 5,972
Pension Costs and Other Postretirement Benefit Costs | GSWC |  |
Regulatory matters: |  |
Regulatory asset authorized under settlement | 36,200 |
Under (over) collection | 33,124 | $ 33,019
Two-way pension balancing account | Pension Costs and Other Postretirement Benefit Costs | GSWC |  |
Regulatory matters: |  |
Regulatory asset authorized under settlement | 3,000 |
Two-way pension balancing account | Purchase, production, distribution and sale of water | Pension Costs and Other Postretirement Benefit Costs | GSWC |  |
Regulatory matters: |  |
Regulatory asset authorized under settlement | (2,042) |
Two-way pension balancing account | Electric | Pension Costs and Other Postretirement Benefit Costs | GSWC |  |
Regulatory matters: |  |
Regulatory asset authorized under settlement | $ (991) |

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
- Definition Amount of liabilities classified as other, due within one year or the normal operating cycle, if longer. + 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 210.5-02.20) -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 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=82887183&loc=d3e6904-107765 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=82887183&loc=d3e6911-107765 + Details
Name: | us-gaap_OtherLiabilitiesCurrent
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The amount for the individual regulatory asset as itemized in a table of regulatory assets 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_RegulatoryAssets
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_OtherRegulatoryAssetsNetMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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

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

X
- Details
Name: | awr_PensionAndOtherPostRetirementObligationsAxis=awr_UnderCollectionInTwoWayPensionBalancingAccountMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=awr_WaterServiceUtilityOperationsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=awr_ElectricServiceUtilityOperationsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |