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Segment and Non-Tariffed Business Reporting (Details)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2018
USD ($)
Jun. 30, 2017
USD ($)
Jun. 30, 2018
USD ($)
subsidiary
reportable_segment
Jun. 30, 2017
USD ($)
Dec. 31, 2017
USD ($)
Segment Reporting Information [Line Items]          
Number of subsidiaries | subsidiary     4    
Number of reportable business segments | reportable_segment     2    
Operating revenue $ 99,086 $ 102,073 $ 174,128 $ 171,118  
Operating expense 76,287 70,254 143,998 127,591  
Operating income (loss) 22,799 31,819 30,130 43,527  
Net income (loss) before noncontrolling interest 12,871 20,584 14,156 24,255  
Depreciation and amortization 13,656 12,033 27,239 24,152  
Senior note and other interest expense 6,084 5,756 12,136 11,813  
Income tax expense (benefit) in net income 4,068 11,964 3,488 13,532  
Assets 1,500,121 1,471,186 1,500,121 1,471,186 $ 1,458,001
Water Utility Services | Regulated          
Segment Reporting Information [Line Items]          
Operating revenue 95,798 98,836 168,151 165,054  
Operating expense 70,642 67,285 132,343 122,031  
Operating income (loss) 25,156 31,551 35,808 43,023  
Net income (loss) before noncontrolling interest 15,022 16,080 19,817 20,029  
Depreciation and amortization 13,272 11,592 26,473 23,252  
Senior note and other interest expense 5,540 5,215 11,048 10,640  
Income tax expense (benefit) in net income 4,650 9,908 5,142 11,701  
Assets 1,449,714 1,398,567 1,449,714 1,398,567  
Water Utility Services | Non-tariffed          
Segment Reporting Information [Line Items]          
Operating revenue 1,967 1,910 3,315 3,174  
Operating expense 1,278 1,223 2,166 2,054  
Operating income (loss) 689 687 1,149 1,120  
Net income (loss) before noncontrolling interest 497 320 828 492  
Depreciation and amortization 85 142 168 278  
Senior note and other interest expense 0 0 0 0  
Income tax expense (benefit) in net income 193 236 322 373  
Assets 3,768 19,358 3,768 19,358  
Real Estate Services | Non-tariffed          
Segment Reporting Information [Line Items]          
Operating revenue 1,321 1,327 2,662 2,890  
Operating expense 891 942 1,740 1,890  
Operating income (loss) 430 385 922 1,000  
Net income (loss) before noncontrolling interest 296 5,321 652 5,681  
Depreciation and amortization 299 299 598 622  
Senior note and other interest expense 0 (3) 0 62  
Income tax expense (benefit) in net income 92 1,988 186 2,116  
Assets 46,756 49,337 46,756 49,337  
All Other | Non-tariffed          
Segment Reporting Information [Line Items]          
Operating revenue [1] 0 0 0 0  
Operating expense [1] 3,476 804 7,749 1,616  
Operating income (loss) [1] (3,476) (804) (7,749) (1,616)  
Net income (loss) before noncontrolling interest [1] (2,944) (1,137) (7,141) (1,947)  
Depreciation and amortization [1] 0 0 0 0  
Senior note and other interest expense [1] 544 544 1,088 1,111  
Income tax expense (benefit) in net income [1] (867) (168) (2,162) (658)  
Assets [1] (117) 3,924 (117) 3,924  
SJW Group | Regulated          
Segment Reporting Information [Line Items]          
Operating revenue 95,798 98,836 168,151 165,054  
Operating expense 70,642 67,285 132,343 122,031  
Operating income (loss) 25,156 31,551 35,808 43,023  
Net income (loss) before noncontrolling interest 15,022 16,080 19,817 20,029  
Depreciation and amortization 13,272 11,592 26,473 23,252  
Senior note and other interest expense 5,540 5,215 11,048 10,640  
Income tax expense (benefit) in net income 4,650 9,908 5,142 11,701  
Assets 1,449,714 1,398,567 1,449,714 1,398,567  
SJW Group | Non-tariffed          
Segment Reporting Information [Line Items]          
Operating revenue 3,288 3,237 5,977 6,064  
Operating expense 5,645 2,969 11,655 5,560  
Operating income (loss) (2,357) 268 (5,678) 504  
Net income (loss) before noncontrolling interest (2,151) 4,504 (5,661) 4,226  
Depreciation and amortization 384 441 766 900  
Senior note and other interest expense 544 541 1,088 1,173  
Income tax expense (benefit) in net income (582) 2,056 (1,654) 1,831  
Assets $ 50,407 $ 72,619 $ 50,407 $ 72,619  
[1] * The “All Other” category includes the accounts of SJW Group and Hydro Sub, Inc. on a stand-alone basis