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Segment and Non-Tariffed Business Reporting - Schedule of Segment Reporting Information, by Segment (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2023 | Mar. 31, 2023 | Jun. 30, 2022 | Mar. 31, 2022 | Jun. 30, 2023 | Jun. 30, 2022 | Dec. 31, 2022
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
Operating revenue | $ 156,886 |  | $ 149,041 |  | $ 294,182 | $ 273,343 |
Operating expense | 125,728 |  | 122,639 |  | 237,846 | 230,352 |
Operating income (loss) | 31,158 |  | 26,402 |  | 56,336 | 42,991 |
Net income (loss) | 18,286 | $ 11,530 | 11,558 | $ 3,737 | 29,816 | 15,295 |
Depreciation and amortization | 26,121 |  | 25,207 |  | 52,417 | 52,813 |
Interest on long-term debt and other interest expense | 16,397 |  | 14,241 |  | 32,169 | 27,970 |
Provision (benefit) for income taxes | (1,512) |  | 2,368 |  | (434) | 3,435 |
Assets | 3,712,158 |  | 3,541,047 |  | 3,712,158 | 3,541,047 | $ 3,632,624
Water Utility Services | Regulated |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
Operating revenue | 152,525 |  | 144,261 |  | 285,797 | 264,779 |
Operating expense | 122,678 |  | 119,430 |  | 231,545 | 220,881 |
Operating income (loss) | 29,847 |  | 24,831 |  | 54,252 | 43,898 |
Net income (loss) | 20,510 |  | 12,765 |  | 33,732 | 22,480 |
Depreciation and amortization | 25,811 |  | 24,458 |  | 51,497 | 48,969 |
Interest on long-term debt and other interest expense | 10,846 |  | 9,805 |  | 21,393 | 18,568 |
Provision (benefit) for income taxes | 102 |  | 2,721 |  | 2,826 | 4,741 |
Assets | 3,605,238 |  | 3,435,758 |  | 3,605,238 | 3,435,758 |
Water Utility Services | Non-tariffed |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
Operating revenue | 2,945 |  | 3,414 |  | 5,522 | 5,842 |
Operating expense | 1,789 |  | 1,797 |  | 3,203 | 5,776 |
Operating income (loss) | 1,156 |  | 1,617 |  | 2,319 | 66 |
Net income (loss) | 596 |  | 1,768 |  | 1,214 | 451 |
Depreciation and amortization | 85 |  | 165 |  | 169 | 2,737 |
Interest on long-term debt and other interest expense | 0 |  | 0 |  | 0 | 0 |
Provision (benefit) for income taxes | 320 |  | 443 |  | 643 | 6 |
Assets | 4,480 |  | 4,220 |  | 4,480 | 4,220 |
Real Estate Services | Non-tariffed |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
Operating revenue | 1,416 |  | 1,366 |  | 2,863 | 2,722 |
Operating expense | 661 |  | 915 |  | 1,560 | 1,824 |
Operating income (loss) | 755 |  | 451 |  | 1,303 | 898 |
Net income (loss) | 544 |  | 323 |  | 969 | 631 |
Depreciation and amortization | 1 |  | 301 |  | 304 | 601 |
Interest on long-term debt and other interest expense | 0 |  | (3) |  | 0 | (3) |
Provision (benefit) for income taxes | 243 |  | 110 |  | 385 | 213 |
Assets | 43,714 |  | 44,033 |  | 43,714 | 44,033 |
All Other | Non-tariffed |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
Operating revenue | 0 |  | 0 |  | 0 | 0 |
Operating expense | 600 |  | 497 |  | 1,538 | 1,871 |
Operating income (loss) | (600) |  | (497) |  | (1,538) | (1,871) |
Net income (loss) | (3,364) |  | (3,298) |  | (6,099) | (8,267) |
Depreciation and amortization | 224 |  | 283 |  | 447 | 506 |
Interest on long-term debt and other interest expense | 5,551 |  | 4,439 |  | 10,776 | 9,405 |
Provision (benefit) for income taxes | (2,177) |  | (906) |  | (4,288) | (1,525) |
Assets | 58,726 |  | 57,036 |  | 58,726 | 57,036 |
SJW Group | Regulated |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
Operating revenue | 152,525 |  | 144,261 |  | 285,797 | 264,779 |
Operating expense | 122,678 |  | 119,430 |  | 231,545 | 220,881 |
Operating income (loss) | 29,847 |  | 24,831 |  | 54,252 | 43,898 |
Net income (loss) | 20,510 |  | 12,765 |  | 33,732 | 22,480 |
Depreciation and amortization | 25,811 |  | 24,458 |  | 51,497 | 48,969 |
Interest on long-term debt and other interest expense | 10,846 |  | 9,805 |  | 21,393 | 18,568 |
Provision (benefit) for income taxes | 102 |  | 2,721 |  | 2,826 | 4,741 |
Assets | 3,605,238 |  | 3,435,758 |  | 3,605,238 | 3,435,758 |
SJW Group | Non-tariffed |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
Operating revenue | 4,361 |  | 4,780 |  | 8,385 | 8,564 |
Operating expense | 3,050 |  | 3,209 |  | 6,301 | 9,471 |
Operating income (loss) | 1,311 |  | 1,571 |  | 2,084 | (907) |
Net income (loss) | (2,224) |  | (1,207) |  | (3,916) | (7,185) |
Depreciation and amortization | 310 |  | 749 |  | 920 | 3,844 |
Interest on long-term debt and other interest expense | 5,551 |  | 4,436 |  | 10,776 | 9,402 |
Provision (benefit) for income taxes | (1,614) |  | (353) |  | (3,260) | (1,306) |
Assets | $ 106,920 |  | $ 105,289 |  | $ 106,920 | $ 105,289 |

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