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Segment and Non-Tariffed Business Reporting - Schedule of Segment Reporting Information, by Segment (Details) $ in Thousands | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2021 USD ($) | Mar. 31, 2021 USD ($) | Jun. 30, 2020 USD ($) | Mar. 31, 2020 USD ($) | Jun. 30, 2021 USD ($) reportingUnit | Jun. 30, 2020 USD ($) | Dec. 31, 2020 USD ($) reportingUnit
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
Operating revenue | $ 152,241 |  | $ 147,209 |  | $ 267,026 | $ 262,963 |
Operating expense | 119,602 |  | 111,139 |  | 221,308 | 211,466 |
Operating income (loss) | 32,639 |  | 36,070 |  | 45,718 | 51,497 |
Net income (loss) | 20,775 | $ 2,616 | 19,721 | $ 2,417 | 23,391 | 22,138 |
Depreciation and amortization | 23,512 |  | 22,753 |  | 46,950 | 44,135 |
Interest on long-term debt and other interest expense | 13,681 |  | 13,180 |  | 27,120 | 26,464 |
Provision (benefit) for income taxes | 3,306 |  | 4,210 |  | 2,410 | 4,648 |
Assets | 3,409,522 |  | 3,209,977 |  | $ 3,409,522 | 3,209,977 | $ 3,311,465
Number of reporting units | reportingUnit |  |  |  |  | 2 |  | 2
Water Utility Services | Regulated |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
Operating revenue | 148,237 |  | 143,072 |  | $ 259,633 | 254,439 |
Operating expense | 115,572 |  | 107,185 |  | 214,050 | 203,202 |
Operating income (loss) | 32,665 |  | 35,887 |  | 45,583 | 51,237 |
Net income (loss) | 20,585 |  | 22,236 |  | 26,284 | 28,064 |
Depreciation and amortization | 22,887 |  | 22,123 |  | 45,704 | 42,872 |
Interest on long-term debt and other interest expense | 8,347 |  | 8,289 |  | 16,518 | 16,463 |
Provision (benefit) for income taxes | 4,580 |  | 5,449 |  | 4,464 | 6,651 |
Assets | 3,300,414 |  | 3,079,118 |  | 3,300,414 | 3,079,118 |
Water Utility Services | Non-tariffed |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
Operating revenue | 2,684 |  | 2,693 |  | 4,729 | 5,710 |
Operating expense | 1,942 |  | 1,759 |  | 3,311 | 3,120 |
Operating income (loss) | 742 |  | 934 |  | 1,418 | 2,590 |
Net income (loss) | 677 |  | 881 |  | 1,399 | 2,351 |
Depreciation and amortization | 110 |  | 108 |  | 219 | 216 |
Interest on long-term debt and other interest expense | 0 |  | 0 |  | 0 | 0 |
Provision (benefit) for income taxes | 203 |  | 260 |  | 385 | 730 |
Assets | 8,248 |  | 9,913 |  | 8,248 | 9,913 |
Real Estate Services | Non-tariffed |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
Operating revenue | 1,320 |  | 1,444 |  | 2,664 | 2,814 |
Operating expense | 881 |  | 850 |  | 1,762 | 1,681 |
Operating income (loss) | 439 |  | 594 |  | 902 | 1,133 |
Net income (loss) | 296 |  | 443 |  | 619 | 831 |
Depreciation and amortization | 291 |  | 298 |  | 580 | 600 |
Interest on long-term debt and other interest expense | 0 |  | 0 |  | 0 | 0 |
Provision (benefit) for income taxes | 96 |  | 124 |  | 205 | 256 |
Assets | 45,090 |  | 44,889 |  | 45,090 | 44,889 |
All Other | Non-tariffed |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
Operating revenue | 0 |  | 0 |  | 0 | 0 |
Operating expense | 1,207 |  | 1,345 |  | 2,185 | 3,463 |
Operating income (loss) | (1,207) |  | (1,345) |  | (2,185) | (3,463) |
Net income (loss) | (783) |  | (3,839) |  | (4,911) | (9,108) |
Depreciation and amortization | 224 |  | 224 |  | 447 | 447 |
Interest on long-term debt and other interest expense | 5,334 |  | 4,891 |  | 10,602 | 10,001 |
Provision (benefit) for income taxes | (1,573) |  | (1,623) |  | (2,644) | (2,989) |
Assets | 55,770 |  | 76,057 |  | 55,770 | 76,057 |
SJW Group | Regulated |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
Operating revenue | 148,237 |  | 143,072 |  | 259,633 | 254,439 |
Operating expense | 115,572 |  | 107,185 |  | 214,050 | 203,202 |
Operating income (loss) | 32,665 |  | 35,887 |  | 45,583 | 51,237 |
Net income (loss) | 20,585 |  | 22,236 |  | 26,284 | 28,064 |
Depreciation and amortization | 22,887 |  | 22,123 |  | 45,704 | 42,872 |
Interest on long-term debt and other interest expense | 8,347 |  | 8,289 |  | 16,518 | 16,463 |
Provision (benefit) for income taxes | 4,580 |  | 5,449 |  | 4,464 | 6,651 |
Assets | 3,300,414 |  | 3,079,118 |  | 3,300,414 | 3,079,118 |
SJW Group | Non-tariffed |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
Operating revenue | 4,004 |  | 4,137 |  | 7,393 | 8,524 |
Operating expense | 4,030 |  | 3,954 |  | 7,258 | 8,264 |
Operating income (loss) | (26) |  | 183 |  | 135 | 260 |
Net income (loss) | 190 |  | (2,515) |  | (2,893) | (5,926) |
Depreciation and amortization | 625 |  | 630 |  | 1,246 | 1,263 |
Interest on long-term debt and other interest expense | 5,334 |  | 4,891 |  | 10,602 | 10,001 |
Provision (benefit) for income taxes | (1,274) |  | (1,239) |  | (2,054) | (2,003) |
Assets | $ 109,108 |  | $ 130,859 |  | $ 109,108 | $ 130,859 |

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