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Summary of Significant Accounting Policies: (Details) customer in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017 USD ($)	Jun. 30, 2016 USD ($)	Jun. 30, 2017 USD ($) customer registrant	Jun. 30, 2016 USD ($)	Dec. 31, 2016 USD ($)	Oct. 31, 2015 USD ($)
Basis of Presentation:
Number of registrants filing combined report | registrant			2
Related Party Transactions
Notes payable to bank	$ 44,000,000		$ 44,000,000		$ 90,000,000
Sales and Use Taxes:
Non-income tax assessments accounted on a gross basis	4,345,000	$ 4,168,000	8,911,000	$ 8,546,000
AWR | Promissory Note | Notes Receivable
Sales and Use Taxes:
Notes receivable	0	0	0	0
AWR | Syndicated Credit Facility
Related Party Transactions
Maximum borrowing capacity on line of credit	150,000,000		150,000,000
GOLDEN STATE WATER COMPANY
Related Party Transactions
Payments to affiliate for corporate office administrative and general costs	1,000,000	1,000,000	2,000,000	2,000,000
Sales and Use Taxes:
Cost of Reimbursable Expense	937,000	1,000,000	1,800,000	1,900,000
Non-income tax assessments accounted on a gross basis	3,982,000	3,823,000	$ 8,172,000	7,810,000
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 | Water Service Utility Operations
Nature of Operations:
Number of customers | customer			259
GOLDEN STATE WATER COMPANY | Electricity distribution
Nature of Operations:
Number of customers | customer			24
ASUS
Sales and Use Taxes:
Non-income tax assessments accounted on a gross basis	$ 72,000	$ 84,000	$ 121,000	$ 146,000
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 | Water Service Utility Operations
Nature of Operations:
Percentage of total revenue	90.00%	90.00%	90.00%	90.00%

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