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Regulatory Matters: Alternative-Revenue Programs (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020
Regulatory matters:
Regulatory assets	$ 18,263		$ 16,539
Water Revenue Adjustment Mechanism and Modified Cost Balancing Account
Regulatory matters:
Increase (decrease) in other regulatory assets	4,700
GOLDEN STATE WATER COMPANY
Regulatory matters:
Regulatory assets	$ 16,230		12,373
GOLDEN STATE WATER COMPANY | Water Revenue Adjustment Mechanism and Modified Cost Balancing Account
Regulatory matters:
Commercial paper, term	90 days
Amount billed to customers as surcharges	$ 1,900	$ 2,200
Regulatory assets	$ 16,580		$ 13,741
GOLDEN STATE WATER COMPANY | Water Revenue Adjustment Mechanism and Modified Cost Balancing Account | Minimum
Regulatory matters:
Regulatory Asset Recovery Periods	12 months
GOLDEN STATE WATER COMPANY | Water Revenue Adjustment Mechanism and Modified Cost Balancing Account | Maximum
Regulatory matters:
Regulatory Asset Recovery Periods	24 months
GOLDEN STATE WATER COMPANY | Water Revenue Adjustment Mechanism [Member]
Regulatory matters:
Regulatory assets	$ 1,400
GOLDEN STATE WATER COMPANY | Modified Cost Balancing Account
Regulatory matters:
Regulatory assets	$ 15,100

X

- Definition

Represents the term associated with a fixed-term security.

+ References

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+ Details

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- Definition

Represents amount billed to customers as surcharges.

+ References

No definition available.

+ Details

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- Definition

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

+ References

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- Definition

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

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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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