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Summary of Significant Accounting Policies (Details) (USD $)
 0 Months Ended 12 Months Ended
May 20, 2013
Dec. 31, 2013
registrant
Dec. 31, 2012
Dec. 31, 2011
Basis of Presentation:        
Number of registrants filing combined report   2    
Stock split ratio 2      
Property and Depreciation        
Net credit acquisition adjustment included in utility plant   $ 8,800,000    
Amortization period of acquisition adjustment permitted by CPUC   30 years    
Amortization of the acquisition adjustments   427,000 374,000  
Impairment of Long-Lived Assets        
Impairment of long-lived assets     416,000  
Goodwill        
Goodwill arose from acquisition of subcontractor's business   1,100,000    
Sales and Use Taxes:        
Non-income tax assessments accounted on a gross basis   15,865,000 15,381,000 14,210,000
GSWC
        
Related Party Transactions        
Balance outstanding   500,000 0  
Property and Depreciation        
Amortization of the acquisition adjustments       374,000
Depreciation on transportation equipment   877,000 1,800,000 2,500,000
Estimated useful lives of utility plant, as authorized by the CPUC        
Generation   40 years    
Interest        
Amount recorded in AFUDC   270,000 299,000  
Weighted cost of capital (as a percent)   8.64%    
Alternative-Revenue Programs        
Number of months within which expected additional revenue collection is recorded   24 months    
Advances for Construction and Contributions in aid of Constructions        
Period for refund of advances for construction   40 years    
Fair Value of Financial Instruments        
Long-term debt-GSWC   412,590,000    
Sales and Use Taxes:        
Franchise fees billed to customers and recorded as operating revenue   3,600,000 3,400,000 3,200,000
Non-income tax assessments accounted on a gross basis   14,072,000 13,835,000 12,851,000
GSWC | Carrying Amount
        
Fair Value of Financial Instruments        
Long-term debt-GSWC   332,377,000 335,791,000  
GSWC | Fair Value
        
Fair Value of Financial Instruments        
Long-term debt-GSWC     456,792,000  
GSWC | Fair Value | Level 2
        
Fair Value of Financial Instruments        
Long-term debt-GSWC   412,590,000    
GSWC | Minimum
        
Estimated useful lives of utility plant, as authorized by the CPUC        
Source of water supply   30 years    
Pumping   25 years    
Water treatment   20 years    
Transmission and distribution   25 years    
Other plant   7 years    
GSWC | Maximum
        
Estimated useful lives of utility plant, as authorized by the CPUC        
Source of water supply   50 years    
Pumping   40 years    
Water treatment   35 years    
Transmission and distribution   55 years    
Other plant   40 years    
GSWC | Purchase, production, distribution and sale of water
        
Nature of Operations:        
Number of customers served   257,000    
Property and Depreciation        
Aggregate composite rate for depreciation (as a percent)   3.40% 3.70% 3.80%
GSWC | Electricity distribution
        
Nature of Operations:        
Number of customers served   24,000    
Property and Depreciation        
Aggregate composite rate for depreciation (as a percent)   3.40% 3.60% 3.70%
ASUS
        
Sales and Use Taxes:        
Non-income tax assessments accounted on a gross basis   864,000 717,000 718,000
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    
AWR
        
Related Party Transactions        
Maximum borrowing capacity on line of credit   100,000,000.0    
AWR | Syndicated Credit Facility
        
Related Party Transactions        
Maximum borrowing capacity on line of credit   100,000,000.0    
AWR | Promissory note
        
Related Party Transactions        
Maximum borrowing capacity on debt instrument   20,000,000.0    
Notes Receivable | AWR | Promissory note
        
Related Party Transactions        
Balance outstanding   $ 500,000    
Commercial and residential water customers | GSWC
        
Nature of Operations:        
Percentage of total revenues   90.00% 90.00% 90.00%