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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.