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Segment and Nonregulated Business Reporting (Details) $ in Thousands | 3 Months Ended |
--- | --- | ---
Mar. 31, 2016 USD ($) subsidiaries | Mar. 31, 2015 USD ($) | Dec. 31, 2015 USD ($)
Segment Reporting Information [Line Items] |  |  |  |
Number of Subsidiaries | subsidiaries |  | 5 |  |
Operating revenue |  | $ 61,112 | $ 62,112 |
Operating expense |  | 50,531 | 49,307 |
Operating income (loss) |  | 10,581 | 12,805 |
Net income (loss) |  | 3,378 | 4,695 |
Depreciation and amortization |  | 11,183 | 10,159 |
Senior note, mortgage and other interest expense |  | 5,435 | 5,652 |
Income tax expense (benefit) in net income |  | 2,122 | 2,794 |
Assets |  | 1,355,576 | 1,273,950 | $ 1,337,325
Water Utility Services | Regulated |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Operating revenue |  | 58,141 | 58,887 |
Operating expense |  | 48,121 | 46,922 |
Operating income (loss) |  | 10,020 | 11,965 |
Net income (loss) |  | 3,571 | 4,701 |
Depreciation and amortization |  | 10,673 | 9,679 |
Senior note, mortgage and other interest expense |  | 4,626 | 4,830 |
Income tax expense (benefit) in net income |  | 2,272 | 2,818 |
Assets |  | 1,265,848 | 1,184,973 |
Water Utility Services | Non-tariffed |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Operating revenue |  | 1,204 | 1,447 |
Operating expense |  | 882 | 962 |
Operating income (loss) |  | 322 | 485 |
Net income (loss) |  | 105 | 218 |
Depreciation and amortization |  | 116 | 90 |
Senior note, mortgage and other interest expense |  | 0 | 0 |
Income tax expense (benefit) in net income |  | 106 | 182 |
Assets |  | 18,566 | 18,668 |
Real Estate Services | Non-tariffed |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Operating revenue |  | 1,767 | 1,778 |
Operating expense |  | 1,032 | 1,024 |
Operating income (loss) |  | 735 | 754 |
Net income (loss) |  | 253 | 260 |
Depreciation and amortization |  | 394 | 390 |
Senior note, mortgage and other interest expense |  | 250 | 255 |
Income tax expense (benefit) in net income |  | 141 | 145 |
Assets |  | 65,536 | 65,995 |
All Other | Non-tariffed |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Operating revenue | [1] | 0 | 0 |
Operating expense | [1] | 496 | 399 |
Operating income (loss) | [1] | (496) | (399) |
Net income (loss) | [1] | (551) | (484) |
Depreciation and amortization | [1] | 0 | 0 |
Senior note, mortgage and other interest expense | [1] | 559 | 567 |
Income tax expense (benefit) in net income | [1] | (397) | (351) |
Assets | [1] | 5,626 | 4,314 |
SJW Corp. | Regulated |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Operating revenue |  | 58,141 | 58,887 |
Operating expense |  | 48,121 | 46,922 |
Operating income (loss) |  | 10,020 | 11,965 |
Net income (loss) |  | 3,571 | 4,701 |
Depreciation and amortization |  | 10,673 | 9,679 |
Senior note, mortgage and other interest expense |  | 4,626 | 4,830 |
Income tax expense (benefit) in net income |  | 2,272 | 2,818 |
Assets |  | 1,265,848 | 1,184,973 |
SJW Corp. | Non-tariffed |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Operating revenue |  | 2,971 | 3,225 |
Operating expense |  | 2,410 | 2,385 |
Operating income (loss) |  | 561 | 840 |
Net income (loss) |  | (193) | (6) |
Depreciation and amortization |  | 510 | 480 |
Senior note, mortgage and other interest expense |  | 809 | 822 |
Income tax expense (benefit) in net income |  | (150) | (24) |
Assets |  | $ 89,728 | $ 88,977 |
[1] | * For the three months ended March 31, 2016, the “All Other” category includes the accounts of SJW Corp. on a stand-alone basis and SJW Group, Inc. For the three months ended March 31, 2016, SJW Group, Inc. had no revenue or expenses recorded and as of March 31, 2016 held no assets.

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