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Regulatory Matters: Alternative-Revenue Programs (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2015	Dec. 31, 2014
WRAM, net of MCBA
Regulatory matters:
Increase (decrease) in other regulatory assets	$ 19,300
GOLDEN STATE WATER COMPANY
Regulatory matters:
Under (over) collection	$ 139,240	$ 125,704
GOLDEN STATE WATER COMPANY | WRAM, net of MCBA
Regulatory matters:
Commercial paper, term	90 days
Amount billed to customers as surcharges	$ 96
Under (over) collection	$ 28,542	9,369
GOLDEN STATE WATER COMPANY | WRAM, net of MCBA | Minimum
Regulatory matters:
Regulatory asset recovery periods	18 months
GOLDEN STATE WATER COMPANY | WRAM, net of MCBA | Maximum
Regulatory matters:
Regulatory asset recovery periods	24 months
GOLDEN STATE WATER COMPANY | WRAM
Regulatory matters:
Under (over) collection	$ 26,000
GOLDEN STATE WATER COMPANY | Modified Cost Balancing Account
Regulatory matters:
Under (over) collection	$ 2,500
GOLDEN STATE WATER COMPANY | Base revenue requirement adjustment mechanism
Regulatory matters:
Regulatory asset recovery periods	24 months
Under (over) collection	$ 5,668	7,761
Customer surcharges expected to be collected		$ 3,100

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- Definition

Represents amount billed to customers as surcharges.

+ References

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- Definition

Regulatory Asset, Customer Surcharges Expected to be Collected

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- Definition

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

+ References

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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://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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- 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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