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Segment and Non-Tariffed Business Reporting - Schedule of Segment Reporting Information, by Segment (Details) $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2021 USD ($) | Jun. 30, 2021 USD ($) | Mar. 31, 2021 USD ($) | Sep. 30, 2020 USD ($) | Jun. 30, 2020 USD ($) | Mar. 31, 2020 USD ($) | Sep. 30, 2021 USD ($) reportingUnit | Sep. 30, 2020 USD ($) | Dec. 31, 2020 USD ($) reportingUnit
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |
Operating revenue | $ 166,923 |  |  | $ 165,863 |  |  | $ 433,949 | $ 428,826 |
Operating expense | 133,149 |  |  | 123,980 |  |  | 354,457 | 335,446 |
Operating income (loss) | 33,774 |  |  | 41,883 |  |  | 79,492 | 93,380 |
Net income (loss) | 19,068 | $ 20,775 | $ 2,616 | 26,093 | $ 19,721 | $ 2,417 | 42,459 | 48,231 |
Depreciation and amortization | 23,837 |  |  | 22,417 |  |  | 70,787 | 66,552 |
Interest on long-term debt and other interest expense | 13,535 |  |  | 13,174 |  |  | 40,655 | 39,638 |
Provision (benefit) for income taxes | 2,749 |  |  | 4,578 |  |  | 5,159 | 9,226 |
Assets | 3,469,741 |  |  | 3,259,714 |  |  | $ 3,469,741 | 3,259,714 | $ 3,311,465
Number of reporting units | reportingUnit |  |  |  |  |  |  | 2 |  | 2
Water Utility Services | Regulated |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |
Operating revenue | 162,352 |  |  | 161,646 |  |  | $ 421,985 | 416,085 |
Operating expense | 129,915 |  |  | 119,885 |  |  | 343,965 | 323,087 |
Operating income (loss) | 32,437 |  |  | 41,761 |  |  | 78,020 | 92,998 |
Net income (loss) | 20,625 |  |  | 25,053 |  |  | 46,909 | 53,117 |
Depreciation and amortization | 23,209 |  |  | 21,782 |  |  | 68,913 | 64,654 |
Interest on long-term debt and other interest expense | 8,805 |  |  | 8,112 |  |  | 25,323 | 24,575 |
Provision (benefit) for income taxes | 3,537 |  |  | 9,450 |  |  | 8,001 | 16,101 |
Assets | 3,352,976 |  |  | 3,131,778 |  |  | 3,352,976 | 3,131,778 |
Water Utility Services | Non-tariffed |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |
Operating revenue | 3,168 |  |  | 2,814 |  |  | 7,897 | 8,524 |
Operating expense | 2,156 |  |  | 2,161 |  |  | 5,467 | 5,281 |
Operating income (loss) | 1,012 |  |  | 653 |  |  | 2,430 | 3,243 |
Net income (loss) | 879 |  |  | 827 |  |  | 2,278 | 3,178 |
Depreciation and amortization | 113 |  |  | 116 |  |  | 332 | 332 |
Interest on long-term debt and other interest expense | 0 |  |  | 0 |  |  | 0 | 0 |
Provision (benefit) for income taxes | 280 |  |  | 179 |  |  | 665 | 909 |
Assets | 7,141 |  |  | 8,589 |  |  | 7,141 | 8,589 |
Real Estate Services | Non-tariffed |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |
Operating revenue | 1,403 |  |  | 1,403 |  |  | 4,067 | 4,217 |
Operating expense | 956 |  |  | 961 |  |  | 2,718 | 2,642 |
Operating income (loss) | 447 |  |  | 442 |  |  | 1,349 | 1,575 |
Net income (loss) | 294 |  |  | 310 |  |  | 913 | 1,141 |
Depreciation and amortization | 292 |  |  | 296 |  |  | 872 | 896 |
Interest on long-term debt and other interest expense | 0 |  |  | 0 |  |  | 0 | 0 |
Provision (benefit) for income taxes | 100 |  |  | 105 |  |  | 305 | 361 |
Assets | 44,629 |  |  | 45,980 |  |  | 44,629 | 45,980 |
All Other | Non-tariffed |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |
Operating revenue | 0 |  |  | 0 |  |  | 0 | 0 |
Operating expense | 122 |  |  | 973 |  |  | 2,307 | 4,436 |
Operating income (loss) | (122) |  |  | (973) |  |  | (2,307) | (4,436) |
Net income (loss) | (2,730) |  |  | (97) |  |  | (7,641) | (9,205) |
Depreciation and amortization | 223 |  |  | 223 |  |  | 670 | 670 |
Interest on long-term debt and other interest expense | 4,730 |  |  | 5,062 |  |  | 15,332 | 15,063 |
Provision (benefit) for income taxes | (1,168) |  |  | (5,156) |  |  | (3,812) | (8,145) |
Assets | 64,995 |  |  | 73,367 |  |  | 64,995 | 73,367 |
SJW Group | Regulated |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |
Operating revenue | 162,352 |  |  | 161,646 |  |  | 421,985 | 416,085 |
Operating expense | 129,915 |  |  | 119,885 |  |  | 343,965 | 323,087 |
Operating income (loss) | 32,437 |  |  | 41,761 |  |  | 78,020 | 92,998 |
Net income (loss) | 20,625 |  |  | 25,053 |  |  | 46,909 | 53,117 |
Depreciation and amortization | 23,209 |  |  | 21,782 |  |  | 68,913 | 64,654 |
Interest on long-term debt and other interest expense | 8,805 |  |  | 8,112 |  |  | 25,323 | 24,575 |
Provision (benefit) for income taxes | 3,537 |  |  | 9,450 |  |  | 8,001 | 16,101 |
Assets | 3,352,976 |  |  | 3,131,778 |  |  | 3,352,976 | 3,131,778 |
SJW Group | Non-tariffed |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |
Operating revenue | 4,571 |  |  | 4,217 |  |  | 11,964 | 12,741 |
Operating expense | 3,234 |  |  | 4,095 |  |  | 10,492 | 12,359 |
Operating income (loss) | 1,337 |  |  | 122 |  |  | 1,472 | 382 |
Net income (loss) | (1,557) |  |  | 1,040 |  |  | (4,450) | (4,886) |
Depreciation and amortization | 628 |  |  | 635 |  |  | 1,874 | 1,898 |
Interest on long-term debt and other interest expense | 4,730 |  |  | 5,062 |  |  | 15,332 | 15,063 |
Provision (benefit) for income taxes | (788) |  |  | (4,872) |  |  | (2,842) | (6,875) |
Assets | $ 116,765 |  |  | $ 127,936 |  |  | $ 116,765 | $ 127,936 |

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