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Segment and Nonregulated Business Reporting (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2013 | Jun. 30, 2012 | Jun. 30, 2013 subsidiaries | Jun. 30, 2012 | Dec. 31, 2012
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |
Number of Subsidiaries |  |  |  |  | 4 |  |  |  |
Operating revenue | $ 74,230 |  | $ 65,575 |  | $ 124,369 |  | $ 116,724 |  |
Operating expense | 57,293 |  | 51,990 |  | 101,659 |  | 96,414 |  |
Operating income (loss) | 16,937 |  | 13,585 |  | 22,710 |  | 20,310 |  |
Net income (loss) | 7,440 |  | 5,201 |  | 8,757 |  | 6,310 |  |
Depreciation and amortization | 8,743 |  | 8,326 |  | 17,559 |  | 16,634 |  |
Senior note, mortgage and other interest expense | 4,956 |  | 5,050 |  | 9,978 |  | 10,125 |  |
Income tax expense (benefit) in net income | 5,191 |  | 3,557 |  | 6,121 |  | 4,356 |  |
Assets | 1,130,465 |  | 1,055,247 |  | 1,130,465 |  | 1,055,247 |  | 1,087,499
Water Utility Services [Member] | Regulated [Member] |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |
Operating revenue | 71,457 |  | 62,902 |  | 119,255 |  | 111,726 |  |
Operating expense | 54,960 |  | 49,997 |  | 96,585 |  | 92,347 |  |
Operating income (loss) | 16,497 |  | 12,905 |  | 22,670 |  | 19,379 |  |
Net income (loss) | 7,686 |  | 5,364 |  | 9,286 |  | 6,818 |  |
Depreciation and amortization | 8,264 |  | 7,768 |  | 16,586 |  | 15,554 |  |
Senior note, mortgage and other interest expense | 4,146 |  | 4,115 |  | 8,298 |  | 8,252 |  |
Income tax expense (benefit) in net income | 5,379 |  | 3,658 |  | 6,301 |  | 4,704 |  |
Assets | 1,034,842 |  | 954,955 |  | 1,034,842 |  | 954,955 |  |
Water Utility Services [Member] | Nonregulated [Member] |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |
Operating revenue | 1,579 |  | 1,422 |  | 2,665 |  | 2,496 |  |
Operating expense | 1,353 |  | 1,159 |  | 3,035 |  | 1,907 |  |
Operating income (loss) | 226 |  | 263 |  | (370) |  | 589 |  |
Net income (loss) | 108 |  | 107 |  | (400) |  | 267 |  |
Depreciation and amortization | 92 |  | 90 |  | 180 |  | 181 |  |
Senior note, mortgage and other interest expense | 0 |  | 0 |  | 0 |  | 0 |  |
Income tax expense (benefit) in net income | 57 |  | 108 |  | (87) |  | 233 |  |
Assets | 16,596 |  | 13,016 |  | 16,596 |  | 13,016 |  |
Real Estate Services [Member] | Nonregulated [Member] |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |
Operating revenue | 1,194 |  | 1,251 |  | 2,449 |  | 2,502 |  |
Operating expense | 748 |  | 827 |  | 1,558 |  | 1,673 |  |
Operating income (loss) | 446 |  | 424 |  | 891 |  | 829 |  |
Net income (loss) | 33 |  | (51) |  | 669 |  | (86) |  |
Depreciation and amortization | 387 |  | 468 |  | 793 |  | 899 |  |
Senior note, mortgage and other interest expense | 265 |  | 391 |  | 585 |  | 785 |  |
Income tax expense (benefit) in net income | 47 |  | (35) |  | 507 |  | (59) |  |
Assets | 71,300 |  | 79,290 |  | 71,300 |  | 79,290 |  |
All Other [Member] | Nonregulated [Member] |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |
Operating revenue | 0 | [1] | 0 | [1] | 0 | [1] | 0 | [1] |
Operating expense | 232 | [1] | 7 | [1] | 481 | [1] | 487 | [1] |
Operating income (loss) | (232) | [1] | (7) | [1] | (481) | [1] | (487) | [1] |
Net income (loss) | (387) | [1] | (219) | [1] | (798) | [1] | (689) | [1] |
Depreciation and amortization | 0 | [1] | 0 | [1] | 0 | [1] | 0 | [1] |
Senior note, mortgage and other interest expense | 545 | [1] | 544 | [1] | 1,095 | [1] | 1,088 | [1] |
Income tax expense (benefit) in net income | (292) | [1] | (174) | [1] | (600) | [1] | (522) | [1] |
Assets | 7,727 | [1] | 7,986 | [1] | 7,727 | [1] | 7,986 | [1] |
SJW Corp. [Member] | Regulated [Member] |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |
Operating revenue | 71,457 |  | 62,902 |  | 119,255 |  | 111,726 |  |
Operating expense | 54,960 |  | 49,997 |  | 96,585 |  | 92,347 |  |
Operating income (loss) | 16,497 |  | 12,905 |  | 22,670 |  | 19,379 |  |
Net income (loss) | 7,686 |  | 5,364 |  | 9,286 |  | 6,818 |  |
Depreciation and amortization | 8,264 |  | 7,768 |  | 16,586 |  | 15,554 |  |
Senior note, mortgage and other interest expense | 4,146 |  | 4,115 |  | 8,298 |  | 8,252 |  |
Income tax expense (benefit) in net income | 5,379 |  | 3,658 |  | 6,301 |  | 4,704 |  |
Assets | 1,034,842 |  | 954,955 |  | 1,034,842 |  | 954,955 |  |
SJW Corp. [Member] | Nonregulated [Member] |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |
Operating revenue | 2,773 |  | 2,673 |  | 5,114 |  | 4,998 |  |
Operating expense | 2,333 |  | 1,993 |  | 5,074 |  | 4,067 |  |
Operating income (loss) | 440 |  | 680 |  | 40 |  | 931 |  |
Net income (loss) | (246) |  | (163) |  | (529) |  | (508) |  |
Depreciation and amortization | 479 |  | 558 |  | 973 |  | 1,080 |  |
Senior note, mortgage and other interest expense | 810 |  | 935 |  | 1,680 |  | 1,873 |  |
Income tax expense (benefit) in net income | (188) |  | (101) |  | (180) |  | (348) |  |
Assets | $ 95,623 |  | $ 100,292 |  | $ 95,623 |  | $ 100,292 |  |
[1] | The “All Other” category includes the accounts of SJW Corp. on a stand-alone basis.

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