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Summary of Significant Accounting Policies Narrative (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Oct. 03, 2013
Public Utilities General Disclosures [Line Items]    
Regulatory rate filings, requested rate increase, authorized revenue   $ 2,400
Customer filing protest period 150 days  
Acequia Water Supply Corporation [Member]
   
Public Utilities General Disclosures [Line Items]    
Ownership percentage in Acequia Water Supply Corporation 25.00%  
Minimum [Member]
   
Public Utilities General Disclosures [Line Items]    
Service area in square miles 240  
Sales [Member] | Product Concentration Risk [Member]
   
Public Utilities General Disclosures [Line Items]    
Percentage of revenue derived from sales of water to business and residential customers 90.00%  
San Jose Water Company [Member]
   
Public Utilities General Disclosures [Line Items]    
Number of people served 1,000,000  
SJWTX,Inc. dba Canyon Lake Water Supply Corporation [Member]
   
Public Utilities General Disclosures [Line Items]    
Number of people served 36,000  
444 West Santa Clara Street, L.P. [Member]
   
Public Utilities General Disclosures [Line Items]    
Limited partership interest percentage 70.00%