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Summary of Significant Accounting Policies (Regulatory Rate Filings) (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2012
Jan. 03, 2012
Dec. 31, 2011
Jun. 02, 2010
Dec. 31, 2012
Cost of capital memorandum account [Member]
Dec. 31, 2011
Cost of capital memorandum account [Member]
Dec. 31, 2012
Water supply balancing accounts [Member]
Dec. 31, 2011
Water supply balancing accounts [Member]
Dec. 31, 2012
Future tax benefits to ratepayers [Member]
Dec. 31, 2011
Future tax benefits to ratepayers [Member]
Dec. 31, 2012
Income tax temporary differences [Member]
Dec. 31, 2011
Income tax temporary differences [Member]
Dec. 31, 2012
Postretirement pensions and other medical benefits [Member]
Dec. 31, 2011
Postretirement pensions and other medical benefits [Member]
Dec. 31, 2012
Pension balancing account [Member]
Dec. 31, 2011
Pension balancing account [Member]
Dec. 31, 2012
Other [Member]
Dec. 31, 2011
Other [Member]
Oct. 27, 2010
SJWTX,Inc. dba Canyon Lake Water Supply Corporation [Member]
Aug. 27, 2010
SJWTX,Inc. dba Canyon Lake Water Supply Corporation [Member]
Public Utilities General Disclosures [Line Items]                                        
Recovery request as a percent of total revenue at the time of filing       2.61%                                
Regulatory Assets and Liabilities [Abstract]                                        
Regulatory assets $ 134,943   $ 119,959               $ 8,712 $ 9,295 $ 113,633 $ 105,988 $ 6,671 $ 0 $ 5,927 $ 4,676    
Regulatory liabilities 4,455   711   2,295 0 1,594 0 566 711                    
Net Regulatory Assets 130,488   119,248                                  
Requested rate increase for 2013   47,400                                    
Requested rate increase for 2013 as percentage of total revenue at time of request   21.51%                                    
Requested rate increase for 2014   13,000                                    
Requested rate increase for 2014 as percentage of total revenue at time of request   4.87%                                    
Requested rate increase for 2015   34,800                                    
Requested rate increase for 2015 as percentage of total revenue at time of request   12.59%                                    
Recovery amount requested in the general rate case   2,600                                    
Amount of net over-collection requested to be refunded to customers   $ 700   $ 5,740                                
Immediate increase requested, percentage                                     38.00%  
Total increase requested, percentage                                       71.00%