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Summary of Significant Accounting Policies: (Details)	3 Months Ended		6 Months Ended
	Jun. 30, 2016 USD ($)	Jun. 30, 2015 USD ($)	Jun. 30, 2016 USD ($) customer registrant	Jun. 30, 2015 USD ($)	Dec. 31, 2015 USD ($)	Oct. 27, 2015 USD ($)
Basis of Presentation:
Number of registrants filing combined report | registrant			2
Related Party Transactions
Notes payable to bank	$ 63,500,000		$ 63,500,000		$ 28,000,000
Sales and Use Taxes:
Non-income tax assessments accounted on a gross basis	4,168,000	$ 4,060,000	8,546,000	$ 8,336,000
Debt issuance costs	4,500,000	4,800,000	4,500,000	4,800,000	$ 4,600,000
AWR | Promissory Note | Notes Receivable [Member]
Sales and Use Taxes:
Notes receivable	0		0
AWR | Syndicated Credit Facility
Related Party Transactions
Maximum borrowing capacity on line of credit	100,000,000		100,000,000
GOLDEN STATE WATER COMPANY
Related Party Transactions
Payments to affiliate for corporate office administrative and general costs	969,000	609,000	2,000,000	1,300,000
Sales and Use Taxes:
Franchise fees billed to customers and recorded as operating revenue	1,000,000	996,000		1,900,000
Non-income tax assessments accounted on a gross basis	3,823,000	3,748,000	$ 7,810,000	7,666,000
GOLDEN STATE WATER COMPANY | Promissory Note
Related Party Transactions
Debt instrument, face amount						$ 40,000,000
Debt instrument, maximum borrowing capacity						40,000,000
GOLDEN STATE WATER COMPANY | Purchase, production, distribution and sale of water
Nature of Operations:
Number of customers served | customer			261,000
GOLDEN STATE WATER COMPANY | Electricity distribution
Nature of Operations:
Number of customers served | customer			24,000
ASUS
Sales and Use Taxes:
Non-income tax assessments accounted on a gross basis	$ 84,000	$ 53,000	$ 146,000	$ 86,000
ASUS | Promissory Note
Related Party Transactions
Debt instrument, face amount						10,000,000
Debt instrument, maximum borrowing capacity						$ 10,000,000
ASUS | Contracts
Nature of Operations:
Period of fixed price contracts to operate and maintain the water and/or wastewater systems at various military bases			50 years
Sales and Use Taxes:
Period of fixed price contracts to operate and maintain the water and/or wastewater systems at various military bases			50 years
Sales | GOLDEN STATE WATER COMPANY | Purchase, production, distribution and sale of water
Nature of Operations:
Percentage of total revenue	90.00%	90.00%	90.00%	90.00%

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