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Segment and Nonregulated Business Reporting (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended |
--- | --- | ---
Mar. 31, 2014 subsidiaries | Mar. 31, 2013 | Dec. 31, 2013
Segment Reporting Information [Line Items] |  |  |  |  |
Number of Subsidiaries | 4 |  |  |  |
Operating revenue | $ 54,596 |  | $ 50,139 |  |
Operating expense | 48,542 |  | 44,366 |  |
Operating income (loss) | 6,054 |  | 5,773 |  |
Net income (loss) | 906 |  | 1,317 |  |
Depreciation and amortization | 9,485 |  | 8,816 |  |
Senior note, mortgage and other interest expense | 4,870 |  | 5,022 |  |
Income tax expense (benefit) in net income | 561 |  | 930 |  |
Assets | 1,123,935 |  | 1,098,691 |  | 1,109,986
Water Utility Services [Member] | Regulated [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating revenue | 51,626 |  | 47,798 |  |
Operating expense | 46,463 |  | 41,625 |  |
Operating income (loss) | 5,163 |  | 6,173 |  |
Net income (loss) | 903 |  | 1,600 |  |
Depreciation and amortization | 8,977 |  | 8,322 |  |
Senior note, mortgage and other interest expense | 4,081 |  | 4,152 |  |
Income tax expense (benefit) in net income | 552 |  | 922 |  |
Assets | 1,027,073 |  | 1,004,441 |  |
Water Utility Services [Member] | Nonregulated [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating revenue | 1,228 |  | 1,086 |  |
Operating expense | 872 |  | 1,682 |  |
Operating income (loss) | 356 |  | (596) |  |
Net income (loss) | 151 |  | (508) |  |
Depreciation and amortization | 90 |  | 88 |  |
Senior note, mortgage and other interest expense | 0 |  | 0 |  |
Income tax expense (benefit) in net income | 124 |  | (144) |  |
Assets | 16,965 |  | 16,171 |  |
Real Estate Services [Member] | Nonregulated [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating revenue | 1,742 |  | 1,255 |  |
Operating expense | 1,022 |  | 810 |  |
Operating income (loss) | 720 |  | 445 |  |
Net income (loss) | 204 |  | 636 |  |
Depreciation and amortization | 418 |  | 406 |  |
Senior note, mortgage and other interest expense | 237 |  | 320 |  |
Income tax expense (benefit) in net income | 153 |  | 460 |  |
Assets | 70,710 |  | 69,492 |  |
All Other [Member] | Nonregulated [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating revenue | 0 | [1] | 0 | [1] |
Operating expense | 185 | [1] | 249 | [1] |
Operating income (loss) | (185) | [1] | (249) | [1] |
Net income (loss) | (352) | [1] | (411) | [1] |
Depreciation and amortization | 0 | [1] | 0 | [1] |
Senior note, mortgage and other interest expense | 552 | [1] | 550 | [1] |
Income tax expense (benefit) in net income | (268) | [1] | (308) | [1] |
Assets | 9,187 | [1] | 8,587 | [1] |
SJW Corp. [Member] | Regulated [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating revenue | 51,626 |  | 47,798 |  |
Operating expense | 46,463 |  | 41,625 |  |
Operating income (loss) | 5,163 |  | 6,173 |  |
Net income (loss) | 903 |  | 1,600 |  |
Depreciation and amortization | 8,977 |  | 8,322 |  |
Senior note, mortgage and other interest expense | 4,081 |  | 4,152 |  |
Income tax expense (benefit) in net income | 552 |  | 922 |  |
Assets | 1,027,073 |  | 1,004,441 |  |
SJW Corp. [Member] | Nonregulated [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating revenue | 2,970 |  | 2,341 |  |
Operating expense | 2,079 |  | 2,741 |  |
Operating income (loss) | 891 |  | (400) |  |
Net income (loss) | 3 |  | (283) |  |
Depreciation and amortization | 508 |  | 494 |  |
Senior note, mortgage and other interest expense | 789 |  | 870 |  |
Income tax expense (benefit) in net income | 9 |  | 8 |  |
Assets | $ 96,862 |  | $ 94,250 |  |
[1] | The “All Other” category includes the accounts of SJW Corp. on a stand-alone basis.

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