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Regulatory Matters 2 (Details) - USD ($) $ in Thousands	1 Months Ended		12 Months Ended
	Oct. 31, 2005	Jul. 31, 2005	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Regulatory matters:
Regulatory Asset Not Accruing Carrying Costs			$ 43,100
Water			319,830	$ 295,258	$ 306,332
Regulatory Assets			2,700
Pension Costs and Other Postretirement Benefit Costs
Regulatory matters:
Regulatory Asset Not Accruing Carrying Costs			43,400
WRAM
Regulatory matters:
Regulatory adjustment			$ 16,300
Cost of Capital, Proceeding for Water Regions [Member]
Regulatory matters:
Weighted Cost of Capital Percent			8.34%
GSWC
Regulatory matters:
Under (over) collection			$ 2,450	28,340
Water			319,830	295,258	$ 306,332
GSWC | Deferred Income Tax Charge [Member]
Regulatory matters:
Under (over) collection			79,886	81,465
GSWC | Pension Costs and Other Postretirement Benefit Costs
Regulatory matters:
Under (over) collection			(40,693)	(33,124)
Regulatory Assets			43,400
GSWC | Costs deferred for future recovery on Aerojet case
Regulatory matters:
Under (over) collection			(8,292)	(9,516)
Recovery period		20 years
Increase in Revenue Requirement, Recoverable through Surcharges		$ 21,300
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			(3,171)	(311)
GSWC | Flow-through taxes, net
Regulatory matters:
Under (over) collection			12,439	15,273
GSWC | General Rate Case Memorandum Accounts [Member]
Regulatory matters:
Under (over) collection			$ (4,820)	(5,054)
GSWC | General Rate Case Memorandum Accounts [Member] | Minimum
Regulatory matters:
Recovery period			12 months
GSWC | General Rate Case Memorandum Accounts [Member] | Maximum
Regulatory matters:
Recovery period			36 months
GSWC | WRAM, net of MCBA
Regulatory matters:
Commercial paper, term			90 days
Amount billed to customers as surcharges			$ 11,600
Under (over) collection			$ (22,535)	(17,763)
GSWC | WRAM, net of MCBA | Maximum
Regulatory matters:
Recovery period			24 months
GSWC | WRAM
Regulatory matters:
Under (over) collection			$ (11,000)
GSWC | Modified Cost Balancing Account
Regulatory matters:
Under (over) collection			$ (11,500)
GSWC | Cost of Capital, Proceeding for Water Regions [Member]
Regulatory matters:
Weighted Cost of Capital Percent			7.91%
Revenue Subject to Refund for TCJA [Member] | GSWC
Regulatory matters:
Under (over) collection			$ 0	8,293
Various refunds to customers | GSWC
Regulatory matters:
Under (over) collection			8,478	$ 7,517
Under Collection in Two Way Pension Balancing Account [Member] | GSWC | Pension Costs and Other Postretirement Benefit Costs
Regulatory matters:
Regulatory adjustment			$ (2,700)

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

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- Definition

Represents the term associated with a fixed-term security.

+ References

No definition available.

+ Details

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- Definition

Represents amount billed to customers as surcharges.

+ References

No definition available.

+ Details

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Namespace Prefix:	awr_
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- Definition

Represents the regulatory asset not accruing carrying costs as of the balance sheet date.

+ References

No definition available.

+ Details

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- Definition

Represents the recovery periods of the surcharge billed to the customers.

+ References

No definition available.

+ Details

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- Definition

-- None. No documentation exists for this element. --

+ References

No definition available.

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- Definition

Represents the weighted cost of capital (return on rate base), with an updated embedded debt cost and the settlement ROE.

+ References

No definition available.

+ Details

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- 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=109223946&loc=d3e3602-108585

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- 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

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- Definition

The amount of regulated water operating revenues recognized during the period.

+ References

No definition available.

+ Details

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- 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

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