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Regulatory Matters: CPUC Rehearing Matter and Procurement Audits (Details) - USD ($)	1 Months Ended	3 Months Ended	9 Months Ended	12 Months Ended
	Oct. 31, 2017	Sep. 30, 2017	Sep. 30, 2017	Dec. 31, 2016	Dec. 31, 2015
Regulatory matters:
Litigation Settlement, Amount Awarded to Other Party		$ 2,600,000
Estimated Litigation Liability, Noncurrent		3,500,000	$ 3,500,000
Water Revenue Adjustment Mechanism [Member] | GOLDEN STATE WATER COMPANY
Regulatory matters:
Deferred Revenue		$ 450,000	$ 450,000	$ 910,000	$ 1,400,000
Minimum | General Rate Case Memorandum Accounts [Member] | GOLDEN STATE WATER COMPANY
Regulatory matters:
Regulatory Asset Recovery Periods			12 months
Maximum [Member] | General Rate Case Memorandum Accounts [Member] | GOLDEN STATE WATER COMPANY
Regulatory matters:
Regulatory Asset Recovery Periods			36 months
City of Claremont [Member] | GOLDEN STATE WATER COMPANY
Regulatory matters:
Litigation Settlement, Expense			$ 5,900,000
City of Claremont [Member] | Maximum [Member]
Regulatory matters:
Litigation Settlement, Expense				$ 7,600,000
Subsequent Event
Regulatory matters:
Litigation Settlement, Expense	$ 895,000

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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.3)
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Carrying amount of estimated litigation liability for known or estimated probable loss from litigation, which may include attorneys' fees and other litigation costs, which is expected to be paid after one year or beyond the normal operating cycle, if longer.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.25)
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Reference 2: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
-Topic 450
-SubTopic 20
-Section 50
-Paragraph 1
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Amount awarded to other party in judgment or settlement of litigation.

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Amount of litigation expense, including but not limited to legal, forensic, accounting, and investigative fees.

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