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Segment and Non-Tariffed Business Reporting (Details) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2017 USD ($) | Jun. 30, 2016 USD ($) | Jun. 30, 2017 USD ($) subsidiary reportable_segment | Jun. 30, 2016 USD ($) | Dec. 31, 2016 USD ($)
Segment Reporting Information [Line Items] |  |  |  |  |  |
Number of subsidiaries | subsidiary |  |  |  | 4 |  |
Number of reportable business segments | reportable_segment |  |  |  | 2 |  |
Operating revenue |  | $ 102,073 | $ 86,944 | $ 171,118 | $ 148,056 |
Operating expense |  | 71,286 | 57,144 | 129,498 | 107,675 |
Operating income (loss) |  | 30,787 | 29,800 | 41,620 | 40,381 |
Net income (loss) before noncontrolling interest |  | 20,584 | 16,775 | 24,255 | 20,153 |
Depreciation and amortization |  | 12,033 | 11,187 | 24,152 | 22,370 |
Senior note, mortgage and other interest expense |  | 5,756 | 5,469 | 11,813 | 10,904 |
Income tax expense (benefit) in net income |  | 11,964 | 10,911 | 13,532 | 13,033 |
Assets |  | 1,471,186 | 1,399,337 | 1,471,186 | 1,399,337 | $ 1,443,376
Water Utility Services | Regulated |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Operating revenue |  | 98,836 | 83,746 | 165,054 | 141,887 |
Operating expense |  | 68,317 | 54,667 | 123,938 | 102,788 |
Operating income (loss) |  | 30,519 | 29,079 | 41,116 | 39,099 |
Net income (loss) before noncontrolling interest |  | 16,080 | 15,023 | 20,029 | 18,594 |
Depreciation and amortization |  | 11,592 | 10,676 | 23,252 | 21,349 |
Senior note, mortgage and other interest expense |  | 5,215 | 4,655 | 10,640 | 9,281 |
Income tax expense (benefit) in net income |  | 9,908 | 9,705 | 11,701 | 11,977 |
Assets |  | 1,398,567 | 1,314,565 | 1,398,567 | 1,314,565 |
Water Utility Services | Non-tariffed |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Operating revenue |  | 1,910 | 1,542 | 3,174 | 2,746 |
Operating expense |  | 1,223 | 1,038 | 2,054 | 1,920 |
Operating income (loss) |  | 687 | 504 | 1,120 | 826 |
Net income (loss) before noncontrolling interest |  | 320 | 214 | 492 | 319 |
Depreciation and amortization |  | 142 | 118 | 278 | 234 |
Senior note, mortgage and other interest expense |  | 0 | 0 | 0 | 0 |
Income tax expense (benefit) in net income |  | 236 | 168 | 373 | 274 |
Assets |  | 19,358 | 18,976 | 19,358 | 18,976 |
Real Estate Services | Non-tariffed |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Operating revenue |  | 1,327 | 1,656 | 2,890 | 3,423 |
Operating expense |  | 942 | 1,021 | 1,890 | 2,053 |
Operating income (loss) |  | 385 | 635 | 1,000 | 1,370 |
Net income (loss) before noncontrolling interest |  | 5,321 | 178 | 5,681 | 431 |
Depreciation and amortization |  | 299 | 393 | 622 | 787 |
Senior note, mortgage and other interest expense |  | (3) | 240 | 62 | 490 |
Income tax expense (benefit) in net income |  | 1,988 | 107 | 2,116 | 248 |
Assets |  | 49,337 | 64,867 | 49,337 | 64,867 |
All Other | Non-tariffed |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Operating revenue | [1] | 0 | 0 | 0 | 0 |
Operating expense | [1] | 804 | 418 | 1,616 | 914 |
Operating income (loss) | [1] | (804) | (418) | (1,616) | (914) |
Net income (loss) before noncontrolling interest | [1] | (1,137) | 1,360 | (1,947) | 809 |
Depreciation and amortization | [1] | 0 | 0 | 0 | 0 |
Senior note, mortgage and other interest expense | [1] | 544 | 574 | 1,111 | 1,133 |
Income tax expense (benefit) in net income | [1] | (168) | 931 | (658) | 534 |
Assets | [1] | 3,924 | 929 | 3,924 | 929 |
SJW Group | Regulated |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Operating revenue |  | 98,836 | 83,746 | 165,054 | 141,887 |
Operating expense |  | 68,317 | 54,667 | 123,938 | 102,788 |
Operating income (loss) |  | 30,519 | 29,079 | 41,116 | 39,099 |
Net income (loss) before noncontrolling interest |  | 16,080 | 15,023 | 20,029 | 18,594 |
Depreciation and amortization |  | 11,592 | 10,676 | 23,252 | 21,349 |
Senior note, mortgage and other interest expense |  | 5,215 | 4,655 | 10,640 | 9,281 |
Income tax expense (benefit) in net income |  | 9,908 | 9,705 | 11,701 | 11,977 |
Assets |  | 1,398,567 | 1,314,565 | 1,398,567 | 1,314,565 |
SJW Group | Non-tariffed |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Operating revenue |  | 3,237 | 3,198 | 6,064 | 6,169 |
Operating expense |  | 2,969 | 2,477 | 5,560 | 4,887 |
Operating income (loss) |  | 268 | 721 | 504 | 1,282 |
Net income (loss) before noncontrolling interest |  | 4,504 | 1,752 | 4,226 | 1,559 |
Depreciation and amortization |  | 441 | 511 | 900 | 1,021 |
Senior note, mortgage and other interest expense |  | 541 | 814 | 1,173 | 1,623 |
Income tax expense (benefit) in net income |  | 2,056 | 1,206 | 1,831 | 1,056 |
Assets |  | $ 72,619 | $ 84,772 | $ 72,619 | $ 84,772 |
[1] | * The “All Other” category includes the accounts of SJW Group on a stand-alone basis

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