XML 70 R54.htm IDEA: XBRL DOCUMENT
v3.20.4

Regulatory Matters 2 (Details) - USD ($) | 1 Months Ended | 12 Months Ended
--- | --- | ---
Oct. 31, 2005 | Jul. 31, 2005 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Regulatory matters: |  |  |  |  |
Regulatory Asset Not Accruing Carrying Costs |  |  | $ 19,800,000 |  |
Under (over) collection |  |  | (16,539,000) | $ 2,450,000 |
Water |  |  | 330,637,000 | 319,830,000 | $ 295,258,000
Excess deferred income taxes |  |  |  |  |
Regulatory matters: |  |  |  |  |
Under (over) collection |  |  | 78,300,000 |  |
Flow-through taxes, net |  |  |  |  |
Regulatory matters: |  |  |  |  |
Under (over) collection |  |  | 10,400,000 |  |
WRAM |  |  |  |  |
Regulatory matters: |  |  |  |  |
Regulatory adjustment |  |  | 5,900,000 |  |
Pension Costs and Other Postretirement Benefit Costs |  |  |  |  |
Regulatory matters: |  |  |  |  |
Regulatory Asset Not Accruing Carrying Costs |  |  | 66,600,000 |  |
GSWC |  |  |  |  |
Regulatory matters: |  |  |  |  |
Under (over) collection |  |  | (12,373,000) | 2,450,000 |
Water |  |  | 330,637,000 | 319,830,000 | $ 295,258,000
GSWC | Excess deferred income taxes |  |  |  |  |
Regulatory matters: |  |  |  |  |
Under (over) collection |  |  | 74,185,000 | 79,886,000 |
GSWC | Costs deferred for future recovery on Aerojet case |  |  |  |  |
Regulatory matters: |  |  |  |  |
Under (over) collection |  |  | (6,751,000) | (8,292,000) |
Recovery period |  | 20 years |  |  |
Increase in Revenue Requirement, Recoverable through Surcharges |  | $ 21,300,000 |  |  |
Deferred Costs, Noncurrent |  |  | 17,500,000 |  |
GSWC | Costs deferred for future recovery on Aerojet case | Maximum |  |  |  |  |
Regulatory matters: |  |  |  |  |
Recovery period | 20 years |  |  |  |
GSWC | Gain (Loss) on Derivative Instruments [Member] |  |  |  |  |
Regulatory matters: |  |  |  |  |
Under (over) collection |  |  | 0 | (3,171,000) |
GSWC | Flow-through taxes, net |  |  |  |  |
Regulatory matters: |  |  |  |  |
Under (over) collection |  |  | $ 9,722,000 | 12,439,000 |
GSWC | WRAM, net of MCBA |  |  |  |  |
Regulatory matters: |  |  |  |  |
Commercial paper, term |  |  | 90 days |  |
Amount billed to customers as surcharges |  |  | $ 14,700,000 |  |
Under (over) collection |  |  | $ (13,741,000) | (22,535,000) |
GSWC | WRAM, net of MCBA | Maximum |  |  |  |  |
Regulatory matters: |  |  |  |  |
Recovery period |  |  | 24 months |  |
GSWC | WRAM |  |  |  |  |
Regulatory matters: |  |  |  |  |
Under (over) collection |  |  | $ 3,600,000 |  |
Deferred Revenues |  |  | 0 |  |
GSWC | Modified Cost Balancing Account |  |  |  |  |
Regulatory matters: |  |  |  |  |
Under (over) collection |  |  | (17,300,000) |  |
GSWC | Pension Costs and Other Postretirement Benefit Costs |  |  |  |  |
Regulatory matters: |  |  |  |  |
Under (over) collection |  |  | (65,576,000) | (40,693,000) |
Regulatory Assets |  |  | 66,600,000 |  |
Various refunds to customers | GSWC |  |  |  |  |
Regulatory matters: |  |  |  |  |
Under (over) collection |  |  | $ 4,577,000 | $ 8,478,000 |

X
- Definition Represents the amount of increase in revenue requirement for difference between the allocated general office costs authorized by the CPUC November 2010 Decision and what was then in rates for allocated general office costs. + References No definition available. + Details
Name: | awr_IncreaseInRevenueRequirementRecoverableThroughSurcharges
Namespace Prefix: | awr_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Represents the term associated with a fixed-term security. + References No definition available. + Details
Name: | awr_InvestmentTerm
Namespace Prefix: | awr_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents amount billed to customers as surcharges. + References No definition available. + Details
Name: | awr_RegulatoryAssetAmountBilledToCustomersAsSurcharges
Namespace Prefix: | awr_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Represents the regulatory asset not accruing carrying costs as of the balance sheet date. + References No definition available. + Details
Name: | awr_RegulatoryAssetNotAccruingCarryingCosts
Namespace Prefix: | awr_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Represents the recovery periods of the surcharge billed to the customers. + References No definition available. + Details
Name: | awr_RegulatoryAssetRecoveryPeriods
Namespace Prefix: | awr_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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 Amount of deferred cost, excluding capitalized cost related to contract with customer; classified as noncurrent. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(17)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(10)) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(10)) -URI http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910 + Details
Name: | us-gaap_DeferredCosts
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of revenue recognized that was previously reported as deferred or unearned revenue. + References No definition available. + Details
Name: | us-gaap_DeferredRevenueRevenueRecognized1
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The increase (decrease) during the reporting period in the value of other assets that are created when regulatory agencies permits public utilities to defer costs to the balance sheet. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3602-108585 + Details
Name: | us-gaap_IncreaseDecreaseInOtherRegulatoryAssets
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
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://fasb.org/us-gaap/role/ref/legacyRef -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 The amount of regulated water operating revenues recognized during the period. + References No definition available. + Details
Name: | us-gaap_RegulatedOperatingRevenueWater
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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://fasb.org/us-gaap/role/ref/legacyRef -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: | us-gaap_RegulatoryAssetAxis=us-gaap_DeferredIncomeTaxChargesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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

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

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

X
- Details
Name: | srt_RangeAxis=srt_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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

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

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

X
- Details
Name: | us-gaap_RegulatoryLiabilityAxis=us-gaap_RevenueSubjectToRefundMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |