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Segment and Non-Tariffed Businesses Reporting - Schedule of Segment Reporting Information, by Segment (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Segment Reporting Information [Line Items] |  |  |
Operating revenue | $ 670,363 | $ 620,698 | $ 573,686
Operating expense | 520,928 | 489,720 | 462,527
Operating income (loss) | 149,435 | 130,978 | 111,159
Net income (loss) | 84,987 | 73,828 | 60,478
Depreciation and amortization | 105,868 | 104,417 | 94,400
Senior note and other interest expense | 66,144 | 58,062 | 54,339
Income tax expense (benefit) in net income | 5,956 | 8,496 | 8,369
Assets | 4,345,067 | 3,755,056 |
Water Utility Services |  |  |
Segment Reporting Information [Line Items] |  |  |
Assets | 4,242,704 | 3,648,748 |
Water Utility Services | Regulated |  |  |
Segment Reporting Information [Line Items] |  |  |
Operating revenue | 652,045 | 603,000 | 558,154
Operating expense | 506,923 | 473,141 | 449,401
Operating income (loss) | 145,122 | 129,859 | 108,753
Net income (loss) | 94,343 | 86,500 | 67,530
Depreciation and amortization | 104,329 | 99,412 | 91,896
Senior note and other interest expense | 42,743 | 37,958 | 34,308
Income tax expense (benefit) in net income | 11,293 | 12,756 | 10,327
Assets | 4,199,172 | 3,643,916 |
Water Utility Services | Non- tariffed |  |  |
Segment Reporting Information [Line Items] |  |  |
Operating revenue | 12,634 | 12,093 | 10,153
Operating expense | 7,452 | 9,538 | 7,138
Operating income (loss) | 5,182 | 2,555 | 3,015
Net income (loss) | 4,452 | 1,060 | 3,309
Depreciation and amortization | 340 | 2,906 | 443
Senior note and other interest expense | 329 | 0 | 0
Income tax expense (benefit) in net income | 1,458 | 708 | 369
Assets | 43,532 | 4,832 |
Real Estate Services | Non- tariffed |  |  |
Segment Reporting Information [Line Items] |  |  |
Operating revenue | 5,684 | 5,605 | 5,379
Operating expense | 2,956 | 3,719 | 3,585
Operating income (loss) | 2,728 | 1,886 | 1,794
Net income (loss) | 2,059 | 1,442 | 1,950
Depreciation and amortization | 306 | 1,206 | 1,168
Senior note and other interest expense | 0 | 0 | 0
Income tax expense (benefit) in net income | 755 | 453 | 619
Assets | 44,222 | 42,801 |
All Other | Non- tariffed |  |  |
Segment Reporting Information [Line Items] |  |  |
Operating revenue | 0 | 0 | 0
Operating expense | 3,597 | 3,322 | 2,403
Operating income (loss) | (3,597) | (3,322) | (2,403)
Net income (loss) | (15,867) | (15,174) | (12,311)
Depreciation and amortization | 893 | 893 | 893
Senior note and other interest expense | 23,072 | 20,104 | 20,031
Income tax expense (benefit) in net income | (7,550) | (5,421) | (2,946)
Assets | 58,141 | 63,507 |
SJW Corp. | Regulated |  |  |
Segment Reporting Information [Line Items] |  |  |
Operating revenue | 652,045 | 603,000 | 558,154
Operating expense | 506,923 | 473,141 | 449,401
Operating income (loss) | 145,122 | 129,859 | 108,753
Net income (loss) | 94,343 | 86,500 | 67,530
Depreciation and amortization | 104,329 | 99,412 | 91,896
Senior note and other interest expense | 42,743 | 37,958 | 34,308
Income tax expense (benefit) in net income | 11,293 | 12,756 | 10,327
Assets | 4,199,172 | 3,643,916 |
SJW Corp. | Non- tariffed |  |  |
Segment Reporting Information [Line Items] |  |  |
Operating revenue | 18,318 | 17,698 | 15,532
Operating expense | 14,005 | 16,579 | 13,126
Operating income (loss) | 4,313 | 1,119 | 2,406
Net income (loss) | (9,356) | (12,672) | (7,052)
Depreciation and amortization | 1,539 | 5,005 | 2,504
Senior note and other interest expense | 23,401 | 20,104 | 20,031
Income tax expense (benefit) in net income | (5,337) | (4,260) | $ (1,958)
Assets | $ 145,895 | $ 111,140 |

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