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Segment and Non-Tariffed Business Reporting (Details)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2018
USD ($)
Sep. 30, 2017
USD ($)
Sep. 30, 2018
USD ($)
subsidiary
reportable_segment
Sep. 30, 2017
USD ($)
Dec. 31, 2017
USD ($)
Segment Reporting Information [Line Items]          
Number of subsidiaries | subsidiary     4    
Number of reportable business segments | reportable_segment     2    
Operating revenue $ 124,853 $ 124,578 $ 298,981 $ 295,696  
Operating expense 99,025 85,380 243,023 212,971  
Operating income (loss) 25,828 39,198 55,958 82,725  
Net income (loss) before noncontrolling interest 15,788 19,540 29,944 43,795  
Depreciation and amortization 13,682 12,065 40,921 36,217  
Senior note and other interest expense 6,077 5,541 18,213 17,354  
Income tax expense (benefit) in net income 4,103 13,523 7,591 27,055  
Assets 1,536,868 1,511,570 1,536,868 1,511,570 $ 1,458,001
Water Utility Services | Regulated          
Segment Reporting Information [Line Items]          
Operating revenue 121,009 120,727 289,160 285,781  
Operating expense 87,230 82,135 219,573 204,166  
Operating income (loss) 33,779 38,592 69,587 81,615  
Net income (loss) before noncontrolling interest 22,333 19,866 42,150 39,895  
Depreciation and amortization 13,298 11,623 39,771 34,875  
Senior note and other interest expense 5,534 4,999 16,582 15,639  
Income tax expense (benefit) in net income 5,910 13,242 11,052 24,943  
Assets 1,480,726 1,438,433 1,480,726 1,438,433  
Water Utility Services | Non-tariffed          
Segment Reporting Information [Line Items]          
Operating revenue 2,403 2,460 5,718 5,634  
Operating expense 1,623 1,511 3,789 3,565  
Operating income (loss) 780 949 1,929 2,069  
Net income (loss) before noncontrolling interest 561 473 1,389 965  
Depreciation and amortization 85 143 253 421  
Senior note and other interest expense 0 0 0 0  
Income tax expense (benefit) in net income 218 340 540 713  
Assets 4,577 20,239 4,577 20,239  
Real Estate Services | Non-tariffed          
Segment Reporting Information [Line Items]          
Operating revenue 1,441 1,391 4,103 4,281  
Operating expense 934 875 2,674 2,765  
Operating income (loss) 507 516 1,429 1,516  
Net income (loss) before noncontrolling interest 359 305 1,011 5,986  
Depreciation and amortization 299 299 897 921  
Senior note and other interest expense 0 (2) 0 60  
Income tax expense (benefit) in net income 113 178 299 2,294  
Assets 47,469 48,917 47,469 48,917  
All Other | Non-tariffed          
Segment Reporting Information [Line Items]          
Operating revenue [1] 0 0 0 0  
Operating expense [1] 9,238 859 16,987 2,475  
Operating income (loss) [1] (9,238) (859) (16,987) (2,475)  
Net income (loss) before noncontrolling interest [1] (7,465) (1,104) (14,606) (3,051)  
Depreciation and amortization [1] 0 0 0 0  
Senior note and other interest expense [1] 543 544 1,631 1,655  
Income tax expense (benefit) in net income [1] (2,138) (237) (4,300) (895)  
Assets [1] 4,096 3,981 4,096 3,981  
SJW Group | Regulated          
Segment Reporting Information [Line Items]          
Operating revenue 121,009 120,727 289,160 285,781  
Operating expense 87,230 82,135 219,573 204,166  
Operating income (loss) 33,779 38,592 69,587 81,615  
Net income (loss) before noncontrolling interest 22,333 19,866 42,150 39,895  
Depreciation and amortization 13,298 11,623 39,771 34,875  
Senior note and other interest expense 5,534 4,999 16,582 15,639  
Income tax expense (benefit) in net income 5,910 13,242 11,052 24,943  
Assets 1,480,726 1,438,433 1,480,726 1,438,433  
SJW Group | Non-tariffed          
Segment Reporting Information [Line Items]          
Operating revenue 3,844 3,851 9,821 9,915  
Operating expense 11,795 3,245 23,450 8,805  
Operating income (loss) (7,951) 606 (13,629) 1,110  
Net income (loss) before noncontrolling interest (6,545) (326) (12,206) 3,900  
Depreciation and amortization 384 442 1,150 1,342  
Senior note and other interest expense 543 542 1,631 1,715  
Income tax expense (benefit) in net income (1,807) 281 (3,461) 2,112  
Assets $ 56,142 $ 73,137 $ 56,142 $ 73,137  
[1] * The “All Other” category includes the accounts of SJW Group and Hydro Sub, Inc. on a stand-alone basis