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Regulatory Matters: Alternative-Revenue Programs (Details) - USD ($)	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015	Dec. 31, 2015
Regulatory matters:
Regulated Operating Revenue, Water	$ 81,058,000	$ 87,581,000	$ 147,370,000	$ 159,085,000
WRAM, net of MCBA
Regulatory matters:
Increase (decrease) in other regulatory assets			22,900,000
GOLDEN STATE WATER COMPANY
Regulatory matters:
Under (over) collection	150,060,000		150,060,000		$ 132,696,000
Regulated Operating Revenue, Water	81,058,000	$ 87,581,000	$ 147,370,000	159,085,000
GOLDEN STATE WATER COMPANY | WRAM, net of MCBA
Regulatory matters:
Commercial paper, term			90 days
Amount billed to customers as surcharges			$ 6,405,000	$ 96,000
Under (over) collection	61,627,000		61,627,000		$ 45,171,000
GOLDEN STATE WATER COMPANY | WRAM, net of MCBA | Maximum
Regulatory matters:
Alternative Revenue Program					24 months
GOLDEN STATE WATER COMPANY | WRAM
Regulatory matters:
Under (over) collection	64,800,000		64,800,000
Regulated Operating Revenue, Water	690,000
Deferred Revenue					$ 1,400,000
GOLDEN STATE WATER COMPANY | Modified Cost Balancing Account
Regulatory matters:
Under (over) collection	$ 3,200,000		$ 3,200,000

X

- Definition

Represents the period of time required for collection of alternative revenue following the year in which the revenue was recorded.

+ References

No definition available.

+ Details

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- Definition

Represents the term associated with a fixed-term security.

+ References

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- Definition

Represents amount billed to customers as surcharges.

+ References

No definition available.

+ Details

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- Definition

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

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- Definition

Amount of deferred revenue as of balance sheet date. Deferred revenue represents collections of cash or other assets related to a revenue producing activity for which revenue has not yet been recognized. Generally, an entity records deferred revenue when it receives consideration from a customer before achieving certain criteria that must be met for revenue to be recognized in conformity with GAAP.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 605
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SAB TOPIC 13.A.4(a).Q1 Response)
-URI http://asc.fasb.org/extlink&oid=27012821&loc=d3e214044-122780

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Staff Accounting Bulletin (SAB)
-Number Topic 13
-Section A

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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://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3602-108585

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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

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- Definition

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

+ References

No definition available.

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