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Summary of Significant Accounting Policies: (Details) (USD $)	3 Months Ended		9 Months Ended				3 Months Ended		9 Months Ended				3 Months Ended		9 Months Ended						0 Months Ended	9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014 registrant	Sep. 30, 2013	May 31, 2013 AWR Promissory Note	Sep. 30, 2014 AWR Syndicated Credit Facility	Sep. 30, 2014 GSWC	Sep. 30, 2013 GSWC	Sep. 30, 2014 GSWC	Sep. 30, 2013 GSWC	Sep. 30, 2014 GSWC Purchase, production, distribution and sale of water customer	Sep. 30, 2014 GSWC Electricity distribution customer	Sep. 30, 2014 ASUS	Sep. 30, 2013 ASUS	Sep. 30, 2014 ASUS	Sep. 30, 2013 ASUS	Sep. 30, 2014 ASUS Contracts	May 23, 2013 Fourth Amendment to Revolving Credit Agreement AWR Syndicated Credit Facility	Jul. 15, 2014 6.87% Medium-Term Notes Series A GSWC	Jul. 15, 2014 7.00% Medium-Term Notes Series A GSWC	Jul. 15, 2014 Medium-term Notes [Member] GSWC	Sep. 30, 2014 Sales GSWC Purchase, production, distribution and sale of water
Nature of Operations:
Number of customers served											257,000	24,000
Percentage of total revenue																						90.00%
Period of fixed price contracts to operate and maintain the water and/or wastewater systems at various military bases																	50 years
Basis of Presentation:
Number of registrants filing combined report			2
Related Party Transactions
Debt instrument, face amount					$ 20,000,000.0														$ 5,000,000	$ 10,000,000
Debt instrument, maximum borrowing capacity					20,000,000.0
Maximum borrowing capacity on line of credit						100,000,000												100,000,000.0
Long term debt
Rate of interest																			6.87%	7.00%
Debt instrument, face amount					20,000,000.0														5,000,000	10,000,000
Repurchase amount																					100.00%
Notes Payable to Banks:
Maximum borrowing capacity on line of credit						100,000,000												100,000,000.0
Maximum borrowing capacity on line of credit, potential election to increase																		50,000,000.0
Sales and Use Taxes:
Franchise fees billed to customers and recorded as operating revenue							1,074,000	1,000,000	2,900,000	2,800,000
Period of fixed price contracts to operate and maintain the water and/or wastewater systems at various military bases																	50 years
Non-income tax assessments accounted on a gross basis	4,359,000	4,108,000	12,649,000	12,004,000			3,879,000	3,572,000	11,305,000	10,663,000			248,000	305,000	554,000	636,000
Related Party Transaction, Amounts of Transaction									$ 2,000,000	$ 1,900,000

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