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Commitments Narrative (Details) $ in Thousands |  |  |  | 12 Months Ended |
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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 |  |  |  |  |

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