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Segment and Nonregulated Business Reporting (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2013 | Sep. 30, 2012 | Sep. 30, 2013 subsidiaries | Sep. 30, 2012 | Dec. 31, 2012
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |
Number of Subsidiaries |  |  |  |  | 4 |  |  |  |
Operating revenue | $ 85,238 |  | $ 82,374 |  | $ 209,607 |  | $ 199,098 |  |
Operating expense | 65,892 |  | 61,497 |  | 167,551 |  | 157,911 |  |
Operating income (loss) | 19,346 |  | 20,877 |  | 42,056 |  | 41,187 |  |
Net income (loss) | 8,950 |  | 10,084 |  | 17,707 |  | 16,394 |  |
Depreciation and amortization | 8,787 |  | 8,288 |  | 26,346 |  | 24,922 |  |
Senior note, mortgage and other interest expense | 5,009 |  | 5,063 |  | 14,987 |  | 15,188 |  |
Income tax expense (benefit) in net income | 5,803 |  | 6,866 |  | 11,924 |  | 11,222 |  |
Assets | 1,149,840 |  | 1,075,319 |  | 1,149,840 |  | 1,075,319 |  | 1,087,499
Water Utility Services [Member] | Regulated [Member] |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |
Operating revenue | 81,894 |  | 79,333 |  | 201,149 |  | 191,059 |  |
Operating expense | 63,260 |  | 59,239 |  | 159,845 |  | 151,586 |  |
Operating income (loss) | 18,634 |  | 20,094 |  | 41,304 |  | 39,473 |  |
Net income (loss) | 9,114 |  | 9,632 |  | 18,400 |  | 16,450 |  |
Depreciation and amortization | 8,293 |  | 7,794 |  | 24,879 |  | 23,348 |  |
Senior note, mortgage and other interest expense | 4,197 |  | 4,140 |  | 12,495 |  | 12,392 |  |
Income tax expense (benefit) in net income | 5,840 |  | 6,557 |  | 12,141 |  | 11,261 |  |
Assets | 1,053,710 |  | 980,086 |  | 1,053,710 |  | 980,086 |  |
Water Utility Services [Member] | Nonregulated [Member] |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |
Operating revenue | 1,859 |  | 1,855 |  | 4,524 |  | 4,351 |  |
Operating expense | 1,538 |  | 1,233 |  | 4,573 |  | 3,140 |  |
Operating income (loss) | 321 |  | 622 |  | (49) |  | 1,211 |  |
Net income (loss) | 109 |  | 326 |  | (291) |  | 593 |  |
Depreciation and amortization | 90 |  | 88 |  | 270 |  | 269 |  |
Senior note, mortgage and other interest expense | 0 |  | 0 |  | 0 |  | 0 |  |
Income tax expense (benefit) in net income | 135 |  | 246 |  | 48 |  | 479 |  |
Assets | 16,443 |  | 13,100 |  | 16,443 |  | 13,100 |  |
Real Estate Services [Member] | Nonregulated [Member] |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |
Operating revenue | 1,485 |  | 1,186 |  | 3,934 |  | 3,688 |  |
Operating expense | 820 |  | 805 |  | 2,378 |  | 2,478 |  |
Operating income (loss) | 665 |  | 381 |  | 1,556 |  | 1,210 |  |
Net income (loss) | 132 |  | 492 |  | 801 |  | 406 |  |
Depreciation and amortization | 404 |  | 406 |  | 1,197 |  | 1,305 |  |
Senior note, mortgage and other interest expense | 268 |  | 380 |  | 853 |  | 1,165 |  |
Income tax expense (benefit) in net income | 132 |  | 338 |  | 639 |  | 279 |  |
Assets | 71,176 |  | 74,116 |  | 71,176 |  | 74,116 |  |
All Other [Member] | Nonregulated [Member] |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |
Operating revenue | 0 | [1] | 0 | [1] | 0 | [1] | 0 | [1] |
Operating expense | 274 | [1] | 220 | [1] | 755 | [1] | 707 | [1] |
Operating income (loss) | (274) | [1] | (220) | [1] | (755) | [1] | (707) | [1] |
Net income (loss) | (405) | [1] | (366) | [1] | (1,203) | [1] | (1,055) | [1] |
Depreciation and amortization | 0 | [1] | 0 | [1] | 0 | [1] | 0 | [1] |
Senior note, mortgage and other interest expense | 544 | [1] | 543 | [1] | 1,639 | [1] | 1,631 | [1] |
Income tax expense (benefit) in net income | (304) | [1] | (275) | [1] | (904) | [1] | (797) | [1] |
Assets | 8,511 | [1] | 8,017 | [1] | 8,511 | [1] | 8,017 | [1] |
SJW Corp. [Member] | Regulated [Member] |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |
Operating revenue | 81,894 |  | 79,333 |  | 201,149 |  | 191,059 |  |
Operating expense | 63,260 |  | 59,239 |  | 159,845 |  | 151,586 |  |
Operating income (loss) | 18,634 |  | 20,094 |  | 41,304 |  | 39,473 |  |
Net income (loss) | 9,114 |  | 9,632 |  | 18,400 |  | 16,450 |  |
Depreciation and amortization | 8,293 |  | 7,794 |  | 24,879 |  | 23,348 |  |
Senior note, mortgage and other interest expense | 4,197 |  | 4,140 |  | 12,495 |  | 12,392 |  |
Income tax expense (benefit) in net income | 5,840 |  | 6,557 |  | 12,141 |  | 11,261 |  |
Assets | 1,053,710 |  | 980,086 |  | 1,053,710 |  | 980,086 |  |
SJW Corp. [Member] | Nonregulated [Member] |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |
Operating revenue | 3,344 |  | 3,041 |  | 8,458 |  | 8,039 |  |
Operating expense | 2,632 |  | 2,258 |  | 7,706 |  | 6,325 |  |
Operating income (loss) | 712 |  | 783 |  | 752 |  | 1,714 |  |
Net income (loss) | (164) |  | 452 |  | (693) |  | (56) |  |
Depreciation and amortization | 494 |  | 494 |  | 1,467 |  | 1,574 |  |
Senior note, mortgage and other interest expense | 812 |  | 923 |  | 2,492 |  | 2,796 |  |
Income tax expense (benefit) in net income | (37) |  | 309 |  | (217) |  | (39) |  |
Assets | $ 96,130 |  | $ 95,233 |  | $ 96,130 |  | $ 95,233 |  |
[1] | The “All Other” category includes the accounts of SJW Corp. on a stand-alone basis.

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