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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

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