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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.