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Commitments Narrative (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended 12 Months Ended 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Nov. 23, 2010
Dec. 31, 2012
Santa Clara Valley Water District [Member]
gal
Dec. 31, 2011
Santa Clara Valley Water District [Member]
gal
Dec. 31, 2010
Santa Clara Valley Water District [Member]
gal
Dec. 31, 1997
Service Agreements [Member]
Dec. 31, 2012
Service Agreements [Member]
Dec. 31, 2012
Concession Fees [Member]
Dec. 31, 2011
Concession Fees [Member]
Dec. 31, 2012
SJWTX,Inc. dba Canyon Lake Water Supply Corporation [Member]
Guadalupe-Blanco River Authority [Member]
acre_foot
Dec. 31, 2012
SJW Corp. [Member]
employee
Dec. 31, 2012
Executive, Administrative or Supervisory Personnel [Member]
SJW Corp. [Member]
employee
Dec. 31, 2012
Union Member [Member]
SJW Corp. [Member]
employee
Long-term Purchase Commitment [Line Items]                              
Master contract, negotiated term for delivery schedules         3 years                    
Water purchased in millions of gallons         22,800,000,000 21,900,000,000 21,200,000,000                
Purchased water $ 66,106 $ 54,317 $ 43,557   $ 48,800 $ 43,500 $ 40,300                
Minimum percent of delivery schedule to be purchased in 2013         90.00%                    
Minimum volume of water to be purchased in 2013         20,800,000,000                    
Cost of water to be purchased in 2013         46,000                    
Current contract water rate         2.2                    
Contrasct life of agreement with City of Cupertino               25 years              
Concession fee with City of Cupertino $ 15,561 $ 14,732             $ 7,362 $ 6,800 $ 6,800        
Long-term Purchase Commitment, Minimum Area Required, Next Twelve Months                       6,700      
Notice period required for contract adjustment                       60 days      
Number of employees                         344 107 237
Collective Bargaining Agreement, Term of Contract 3 years                            
Collective bargaining agreement percent of wage increase for 2011       2.00%                      
Collective bargaining agreement percent of wage increase for 2012       2.00%                      
Collective bargaining agreement percent of wage increase for 2013       3.00%