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Commitments Narrative (Details)
$ in Thousands
 12 Months Ended
Jun. 22, 2020
Feb. 20, 2020
May 19, 2003
Dec. 31, 2020
USD ($)
employee
acre_foot
$ / ft³
$ / million_gallons
gal
Dec. 31, 2019
USD ($)
gal
Dec. 31, 2018
USD ($)
gal
Dec. 31, 2008
$ / yr
gal
Dec. 31, 1997
Jan. 08, 2020
USD ($)
Long-term Purchase Commitment [Line Items]                  
Purchased water       $ 100,723 $ 99,118 $ 97,378      
Intangible assets       $ 35,167 33,424        
Collective bargaining agreement percent of wage increase for 2020   3.00%              
Collective bargaining agreement percent of wage increase for 2021   3.00%              
Collective bargaining agreement percent of wage increase for 2022   4.00%              
SJW Group                  
Long-term Purchase Commitment [Line Items]                  
Number of employees | employee       370          
SJW Group | Executive, Administrative or Supervisory Personnel                  
Long-term Purchase Commitment [Line Items]                  
Number of employees | employee       137          
SJW Group | Union Member                  
Long-term Purchase Commitment [Line Items]                  
Number of employees | employee       233          
Minimum                  
Long-term Purchase Commitment [Line Items]                  
Contract life of agreement with City of Cupertino       5 years          
Maximum                  
Long-term Purchase Commitment [Line Items]                  
Contract life of agreement with City of Cupertino       70 years          
RWA | Capacity Agreement                  
Long-term Purchase Commitment [Line Items]                  
Current contract water rate (in USD per million of gallons)       2,621     75    
Purchase commitment period             14 years    
RWA | Capacity Agreement | Minimum                  
Long-term Purchase Commitment [Line Items]                  
Purchase commitment period             50 years    
RWA | Capacity Agreement | Maximum                  
Long-term Purchase Commitment [Line Items]                  
Agreement to purchase water (in gallons of water) | gal             1,000,000    
MDC | Capacity Agreement                  
Long-term Purchase Commitment [Line Items]                  
Current contract water rate (in USD per million of gallons) | $ / ft³       3.97          
Purchase commitment period     50 years            
Agreement to purchase water (in gallons of water) | gal       283,000,000          
Kennebec Water District                  
Long-term Purchase Commitment [Line Items]                  
Agreement to purchase water (in gallons of water) | gal       50,000,000          
Long-term purchase commitment, wholesale discount (in USD per hundred cubic feet) | $ / ft³       0.20          
Tariff rate (in USD per hundred cubic feet) | $ / ft³       1.51          
International Union of Operating Engineers | SJW Group                  
Long-term Purchase Commitment [Line Items]                  
Bargaining agreements, term   3 years              
Service Agreements                  
Long-term Purchase Commitment [Line Items]                  
Contract life of agreement with City of Cupertino               25 years  
Intangible assets       $ 3,999          
Concession fees                  
Long-term Purchase Commitment [Line Items]                  
Intangible assets       $ 6,800 $ 6,800       $ 5,000
Santa Clara Valley Water District                  
Long-term Purchase Commitment [Line Items]                  
Master contract, negotiated term for delivery schedules       3 years          
Water purchased (in millions of gallons) | gal       21,269,000,000 21,862,000,000 21,345,000,000      
Purchased water       $ 96,212 $ 96,285 $ 87,702      
Reduction in delivery schedule 10.00%                
Minimum percent of delivery schedule to be purchased       90.00%          
Minimum volume of water to be purchased (in million gallons) | gal       19,794,000,000          
Cost of water to be purchased       $ 89,539          
Current contract water rate (in USD per million of gallons) | $ / million_gallons       4.5          
Guadalupe-Blanco River Authority | SJWTX, Inc. dba Canyon Lake Water Supply Corporation                  
Long-term Purchase Commitment [Line Items]                  
Long-term purchase commitment, minimum area required (in acre-feet of water) | acre_foot       6,900          
Notice period required for contract adjustment       60 days          
Lower Colorado River Authority | SJWTX, Inc. dba Canyon Lake Water Supply Corporation                  
Long-term Purchase Commitment [Line Items]                  
Long-term purchase commitment, minimum area required (in acre-feet of water) | acre_foot       250