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Financial Statement Schedule - Condensed Statements of Comprehensive Income (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Condensed Financial Statements, Captions [Line Items]                      
Operating revenue                 $ 564,526 $ 420,482 $ 397,699
Operating expense:                      
Administrative and general                 79,741 66,301 48,933
Property taxes and other non-income taxes                 29,886 19,068 14,975
Merger related expenses                 0 15,768 18,610
Total operating expense                 446,856 363,003 324,259
Operating income $ 24,290 $ 41,883 $ 36,070 $ 15,427 $ 6,016 $ 17,084 $ 21,971 $ 12,408 117,670 57,479 73,440
Other (expense) income:                      
Interest on long-term debt, mortgage and other interest expense                 (54,255) (31,796) (24,332)
Interest income on money market fund                 0 6,536 155
Other, net                 5,906 2,091 2,348
Income before income taxes                 69,895 32,081 48,832
Provision for income taxes                 8,380 8,454 10,065
SJW Group net income 13,284 26,093 19,721 2,417 (5,486) 9,478 13,538 5,873 61,515 23,403 38,767
Other comprehensive (loss) income, net                 (1,190) 126 0
SJW Group comprehensive income $ 12,142 $ 26,169 $ 19,731 $ 2,282 $ (5,360) $ 9,478 $ 13,538 $ 5,873 60,325 23,529 38,767
SJW Group                      
Condensed Financial Statements, Captions [Line Items]                      
Operating revenue                 0 0 0
Operating expense:                      
Administrative and general                 3,110 8,130 2,312
Property taxes and other non-income taxes                 250 250 250
Merger related expenses                 0 14,849 18,610
Total operating expense                 3,360 23,229 21,172
Operating income                 (3,360) (23,229) (21,172)
Other (expense) income:                      
Interest on long-term debt, mortgage and other interest expense                 (19,430) (6,615) (2,264)
Interest income on money market fund                 0 6,536 155
Other, net                 (250) 89 (248)
Income before income taxes                 (23,040) (23,219) (23,529)
Provision for income taxes                 (6,414) (1,431) (6,917)
Equity earnings from subsidiaries, net of taxes                 78,141 45,191 55,379
Subsidiaries                      
Other (expense) income:                      
Equity earnings from subsidiaries, net of taxes                 $ 78,141 $ 45,191 $ 55,379