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Commitments Narrative (Details)
$ in Thousands, gal in Millions
 1 Months Ended 12 Months Ended
Nov. 30, 2016
Dec. 31, 2018
USD ($)
employee
acre_foot
$ / million_gallons
gal
Dec. 31, 2017
USD ($)
gal
Dec. 31, 2016
USD ($)
gal
Dec. 31, 1997
Long-term Purchase Commitment [Line Items]          
Purchased water   $ 97,378 $ 86,456 $ 72,971  
Reduction in delivery schedule   10.00%      
Intangible assets   $ 15,799 $ 14,413    
Collective Bargaining Agreement, Term of Contract 3 years        
Collective bargaining agreement percent of wage increase for 2017 3.50%        
Collective bargaining agreement percent of wage increase for 2018 3.00%        
Collective bargaining agreement percent of wage increase for 2019 4.00%        
Santa Clara Valley Water District [Member]          
Long-term Purchase Commitment [Line Items]          
Master contract, negotiated term for delivery schedules   3 years      
Water purchased in millions of gallons | gal   19,477 20,172 18,241  
Purchased water   $ 80,243 $ 76,106 $ 61,645  
Minimum percent of delivery schedule to be purchased in 2017   90.00%      
Minimum volume of water to be purchased in 2017 | gal   19,775      
Cost of water to be purchased in 2017   $ 84,296      
Current contract water rate | $ / million_gallons   4.3      
Service Agreements [Member]          
Long-term Purchase Commitment [Line Items]          
Contract life of agreement with City of Cupertino         25 years
Intangible assets   $ 4,128      
Concession Fees [Member]          
Long-term Purchase Commitment [Line Items]          
Intangible assets   $ 6,800 $ 6,800    
SJW Group [Member]          
Long-term Purchase Commitment [Line Items]          
Number of employees | employee   367      
SJWTX,Inc. dba Canyon Lake Water Supply Corporation [Member] | Guadalupe-Blanco River Authority [Member]          
Long-term Purchase Commitment [Line Items]          
Long-term Purchase Commitment, Minimum Area Required, Next Twelve Months | acre_foot   6,900      
Notice period required for contract adjustment   60 days      
SJWTX,Inc. dba Canyon Lake Water Supply Corporation [Member] | Lower Colorado River Authority [Member]          
Long-term Purchase Commitment [Line Items]          
Long-term Purchase Commitment, Minimum Area Required, Next Twelve Months | acre_foot   250      
Executive, Administrative or Supervisory Personnel [Member] | SJW Group [Member]          
Long-term Purchase Commitment [Line Items]          
Number of employees | employee   132      
Union Member [Member] | SJW Group [Member]          
Long-term Purchase Commitment [Line Items]          
Number of employees | employee   235      
Minimum [Member]          
Long-term Purchase Commitment [Line Items]          
Contract life of agreement with City of Cupertino   5 years      
Maximum [Member]          
Long-term Purchase Commitment [Line Items]          
Contract life of agreement with City of Cupertino   70 years