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Regulatory Matters (Details) - USD ($)	1 Months Ended		12 Months Ended
	Oct. 31, 2005	Jul. 31, 2005	Dec. 31, 2020	Dec. 31, 2019
Regulatory matters:
Total			$ 16,539,000	$ (2,450,000)
Regulatory Asset Not Accruing Carrying Costs			19,800,000
Regulatory Asset CEMA			4,400,000
Water Revenue Adjustment Mechanism [Member]
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
Flow-through taxes, net
Regulatory matters:
Total			(10,400,000)
Excess deferred income taxes
Regulatory matters:
Total			(78,300,000)
GSWC
Regulatory matters:
Total			12,373,000	(2,450,000)
Regulatory Asset CEMA			4,100,000
GSWC | Various refunds to customers
Regulatory matters:
Total			(4,577,000)	(8,478,000)
GSWC | WRAM, net of MCBA
Regulatory matters:
Total			13,741,000	22,535,000
GSWC | Water Revenue Adjustment Mechanism [Member]
Regulatory matters:
Total			(3,600,000)
Deferred Revenues			0
GSWC | Costs deferred for future recovery on Aerojet case
Regulatory matters:
Total			6,751,000	8,292,000
Regulatory Asset Recovery Periods		20 years
Increase in Revenue Requirement, Recoverable through Surcharges		$ 21,300,000
GSWC | Pension Costs and Other Postretirement Benefit Costs
Regulatory matters:
Regulatory Assets			66,600,000
Total			65,576,000	40,693,000
GSWC | Gain (Loss) on Derivative Instruments [Member]
Regulatory matters:
Total			0	3,171,000
GSWC | COVID-19 memorandum account
Regulatory matters:
Total			4,119,000	0
GSWC | Flow-through taxes, net
Regulatory matters:
Total			(9,722,000)	(12,439,000)
GSWC | Excess deferred income taxes
Regulatory matters:
Total			(74,185,000)	(79,886,000)
GSWC | Other Regulatory Assets
Regulatory matters:
Total			10,670,000	23,662,000
Bear Valley Electric Service, Inc.
Regulatory matters:
Regulatory Asset CEMA			295,000
Bear Valley Electric Service, Inc. | Gain (Loss) on Derivative Instruments [Member]
Regulatory matters:
Total			1,537,000	0
Bear Valley Electric Service, Inc. | Other Regulatory Assets
Regulatory matters:
Total			$ 2,629,000	$ 0
Maximum | GSWC | WRAM, net of MCBA
Regulatory matters:
Regulatory Asset Recovery Periods			24 months
Maximum | GSWC | Costs deferred for future recovery on Aerojet case
Regulatory matters:
Regulatory Asset Recovery Periods	20 years

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

Regulatory Asset CEMA

+ References

No definition available.

+ Details

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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.

+ Details

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- Definition

Amount of revenue recognized that was previously reported as deferred or unearned revenue.

+ References

No definition available.

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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=121586364&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 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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