XML 45 R34.htm IDEA: XBRL DOCUMENT v3.7.0.1
Regulatory Rate Filings (Details)
$ in Thousands
 12 Months Ended
Apr. 03, 2017
USD ($)
Feb. 17, 2017
USD ($)
Feb. 01, 2017
$ / gal
Jan. 01, 2017
Nov. 15, 2016
USD ($)
Dec. 31, 2016
$ / gal
Public Utilities, General Disclosures [Line Items]            
Public Utilities, Requested Rate Increase (Decrease), Amount   $ 5,339     $ 13,205  
Public Utilities, Requested Rate Increase (Decrease), Percentage   1.50%     3.80%  
SJWTX, Inc.            
Public Utilities, General Disclosures [Line Items]            
Public Utilities, Requested Rate Increase (Decrease), Percentage       2.30%    
Authorized Regulatory Surcharge, Per Gallon | $ / gal     1.15     1.34
Subsequent event            
Public Utilities, General Disclosures [Line Items]            
Public Utilities, Requested Rate Increase (Decrease), Amount $ 7,550          
Public Utilities, Requested Rate Increase (Decrease), Percentage 2.10%