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Summary of Significant Accounting Policies Narrative (Details)
12 Months Ended
Dec. 31, 2012
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 91.00%
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%