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Segment and Non-Tariffed Business Reporting (Details)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2017
USD ($)
Sep. 30, 2016
USD ($)
Sep. 30, 2017
USD ($)
subsidiary
reportable_segment
Sep. 30, 2016
USD ($)
Dec. 31, 2016
USD ($)
Segment Reporting Information [Line Items]          
Number of subsidiaries | subsidiary     4    
Number of reportable business segments | reportable_segment     2    
Operating revenue $ 124,578 $ 112,344 $ 295,696 $ 260,400  
Operating expense 86,333 75,998 215,831 183,673  
Operating income (loss) 38,245 36,346 79,865 76,727  
Net income (loss) before noncontrolling interest 19,540 18,959 43,795 39,112  
Depreciation and amortization 12,065 11,119 36,217 33,489  
Senior note, mortgage and other interest expense 5,541 5,426 17,354 16,330  
Income tax expense (benefit) in net income 13,523 12,512 27,055 25,545  
Assets 1,511,570 1,454,341 1,511,570 1,454,341 $ 1,443,376
Water Utility Services | Regulated          
Segment Reporting Information [Line Items]          
Operating revenue 120,727 108,502 285,781 250,389  
Operating expense 83,088 73,179 207,026 175,967  
Operating income (loss) 37,639 35,323 78,755 74,422  
Net income (loss) before noncontrolling interest 19,866 19,216 39,895 37,810  
Depreciation and amortization 11,623 10,678 34,875 32,027  
Senior note, mortgage and other interest expense 4,999 4,648 15,639 13,929  
Income tax expense (benefit) in net income 13,242 12,145 24,943 24,122  
Assets 1,438,433 1,359,419 1,438,433 1,359,419  
Water Utility Services | Non-tariffed          
Segment Reporting Information [Line Items]          
Operating revenue 2,460 2,056 5,634 4,802  
Operating expense 1,511 1,355 3,565 3,275  
Operating income (loss) 949 701 2,069 1,527  
Net income (loss) before noncontrolling interest 473 330 965 649  
Depreciation and amortization 143 116 421 350  
Senior note, mortgage and other interest expense 0 0 0 0  
Income tax expense (benefit) in net income 340 247 713 521  
Assets 20,239 18,092 20,239 18,092  
Real Estate Services | Non-tariffed          
Segment Reporting Information [Line Items]          
Operating revenue 1,391 1,786 4,281 5,209  
Operating expense 875 1,108 2,765 3,161  
Operating income (loss) 516 678 1,516 2,048  
Net income (loss) before noncontrolling interest 305 239 5,986 670  
Depreciation and amortization 299 325 921 1,112  
Senior note, mortgage and other interest expense (2) 216 60 706  
Income tax expense (benefit) in net income 178 106 2,294 354  
Assets 48,917 75,909 48,917 75,909  
All Other | Non-tariffed          
Segment Reporting Information [Line Items]          
Operating revenue [1] 0 0 0 0  
Operating expense [1] 859 356 2,475 1,270  
Operating income (loss) [1] (859) (356) (2,475) (1,270)  
Net income (loss) before noncontrolling interest [1] (1,104) (826) (3,051) (17)  
Depreciation and amortization [1] 0 0 0 0  
Senior note, mortgage and other interest expense [1] 544 562 1,655 1,695  
Income tax expense (benefit) in net income [1] (237) 14 (895) 548  
Assets [1] 3,981 921 3,981 921  
SJW Group | Regulated          
Segment Reporting Information [Line Items]          
Operating revenue 120,727 108,502 285,781 250,389  
Operating expense 83,088 73,179 207,026 175,967  
Operating income (loss) 37,639 35,323 78,755 74,422  
Net income (loss) before noncontrolling interest 19,866 19,216 39,895 37,810  
Depreciation and amortization 11,623 10,678 34,875 32,027  
Senior note, mortgage and other interest expense 4,999 4,648 15,639 13,929  
Income tax expense (benefit) in net income 13,242 12,145 24,943 24,122  
Assets 1,438,433 1,359,419 1,438,433 1,359,419  
SJW Group | Non-tariffed          
Segment Reporting Information [Line Items]          
Operating revenue 3,851 3,842 9,915 10,011  
Operating expense 3,245 2,819 8,805 7,706  
Operating income (loss) 606 1,023 1,110 2,305  
Net income (loss) before noncontrolling interest (326) (257) 3,900 1,302  
Depreciation and amortization 442 441 1,342 1,462  
Senior note, mortgage and other interest expense 542 778 1,715 2,401  
Income tax expense (benefit) in net income 281 367 2,112 1,423  
Assets $ 73,137 $ 94,922 $ 73,137 $ 94,922  
[1] * The “All Other” category includes the accounts of SJW Group on a stand-alone basis