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Summary of Significant Accounting Policies: (Details) (USD $)
 0 Months Ended 3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended
May 20, 2013
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
registrant
Jun. 30, 2012
Dec. 31, 2012
May 31, 2013
AWR
Promissory Note
Jun. 30, 2013
AWR
Syndicated Credit Facility
Jun. 30, 2013
GSWC
Jun. 30, 2012
GSWC
Jun. 30, 2013
GSWC
Jun. 30, 2012
GSWC
Dec. 31, 2012
GSWC
Jun. 30, 2013
GSWC
Purchase, production, distribution and sale of water
customer
Jun. 30, 2013
GSWC
Electricity distribution
customer
Jun. 30, 2013
ASUS
Jun. 30, 2012
ASUS
Jun. 30, 2013
ASUS
Jun. 30, 2012
ASUS
Jun. 30, 2013
ASUS
Contracts
Jun. 30, 2013
Fourth Amendment to Revolving Credit Agreement
AWR
Syndicated Credit Facility
May 23, 2013
Fourth Amendment to Revolving Credit Agreement
AWR
Syndicated Credit Facility
Jun. 30, 2013
Current Notes Receivable [Member]
AWR
Promissory Note
Nature of Operations:                                              
Number of customers served                           256,000 23,000                
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                                      
Stock split, conversion ratio 2                                            
Related Party Transactions                                              
Debt instrument, face amount             $ 20,000,000                                
Debt instrument, maximum borrowing capacity             20,000,000                                
Long-term debt, current   3,383,000   3,383,000   3,328,000     3,383,000   3,383,000   3,328,000                   9,200,000
Maximum borrowing capacity on line of credit               100,000,000                           100,000,000.0  
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  
Line of credit, amount outstanding                                         0    
Sales and Use Taxes:                                              
Franchise fees billed to customers and recorded as operating revenue                 947,000 850,000 1,800,000 1,600,000                      
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   $ 3,748,000 $ 3,716,000 $ 7,896,000 $ 7,821,000       $ 3,375,000 $ 3,354,000 $ 7,091,000 $ 7,097,000       $ 169,000 $ 186,000 $ 331,000 $ 341,000