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Long-Term Debt - Schedule of Long-term Debt Instruments (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Debt Instrument [Line Items]
Total debt	$ 1,488,788	$ 1,522,955
Unamortized debt premium, net	17,396	19,937
Unamortized debt issuance costs	(9,859)	(10,851)
Current portion	(4,360)	(39,106)
Total long-term debt, less current portion	1,491,965	1,492,935
SJW Group
Debt Instrument [Line Items]
Total long-term debt, less current portion	556,627	556,225
SJW Group | Senior notes
Debt Instrument [Line Items]
Total debt	$ 560,000	560,000
SJW Group | Senior notes | Minimum
Debt Instrument [Line Items]
Rate	2.47%
SJW Group | Senior notes | Maximum
Debt Instrument [Line Items]
Rate	3.53%
SJWC | California Pollution Control Financing Authority Revenue Bond
Debt Instrument [Line Items]
Total debt	$ 470,000	540,000
SJWC | Senior notes
Debt Instrument [Line Items]
Total debt	$ 400,000	420,000
SJWC | Senior notes | Minimum
Debt Instrument [Line Items]
Rate	3.00%
SJWC | Senior notes | Maximum
Debt Instrument [Line Items]
Rate	7.37%
SJWC | Public utility, bonds | California Pollution Control Financing Authority Revenue Bond
Debt Instrument [Line Items]
Total debt	$ 70,000	120,000
SJWC | Public utility, bonds | California Pollution Control Financing Authority Revenue Bond | Maximum
Debt Instrument [Line Items]
Rate	4.75%
CTWS | Bank term loans
Debt Instrument [Line Items]
Total debt	$ 18,444	20,351
CTWS | Bank term loans | Minimum
Debt Instrument [Line Items]
Rate	4.09%
CTWS | Bank term loans | Maximum
Debt Instrument [Line Items]
Rate	4.15%
Connecticut Water Company
Debt Instrument [Line Items]
Total debt	$ 313,345	303,140
Connecticut Water Company | Senior notes
Debt Instrument [Line Items]
Total debt	$ 195,000	170,000
Connecticut Water Company | Senior notes | Minimum
Debt Instrument [Line Items]
Rate	3.07%
Connecticut Water Company | Senior notes | Maximum
Debt Instrument [Line Items]
Rate	4.71%
Connecticut Water Company | Public utility, bonds | Connecticut Innovations Revenue Bonds, variable rate
Debt Instrument [Line Items]
Total debt	$ 22,050	22,050
Connecticut Water Company | Bank term loans
Debt Instrument [Line Items]
Total debt	$ 96,295	111,090
Connecticut Water Company | Bank term loans | Minimum
Debt Instrument [Line Items]
Rate	4.04%
Connecticut Water Company | Bank term loans | Maximum
Debt Instrument [Line Items]
Rate	4.75%
SJWTX
Debt Instrument [Line Items]
Total debt	$ 60,000	45,000
SJWTX | Senior notes
Debt Instrument [Line Items]
Total debt	$ 15,000	15,000
SJWTX | Senior notes | Minimum
Debt Instrument [Line Items]
Rate	6.27%
SJWTX | Senior notes | Maximum
Debt Instrument [Line Items]
Rate	6.27%
SJWTX | Bank term loans
Debt Instrument [Line Items]
Total debt	$ 45,000	30,000
SJWTX | Bank term loans | Minimum
Debt Instrument [Line Items]
Rate	4.01%
SJWTX | Bank term loans | Maximum
Debt Instrument [Line Items]
Rate	5.54%
Maine Water Company
Debt Instrument [Line Items]
Total debt	$ 66,999	54,464
Maine Water Company | Public utility, bonds | State revolving fund loans
Debt Instrument [Line Items]
Total debt	$ 15,699	17,264
Maine Water Company | Public utility, bonds | State revolving fund loans | Minimum
Debt Instrument [Line Items]
Rate	0.00%
Maine Water Company | Public utility, bonds | State revolving fund loans | Maximum
Debt Instrument [Line Items]
Rate	2.23%
Maine Water Company | Public utility, bonds | Other First Mortgage Bond
Debt Instrument [Line Items]
Total debt	$ 1,800	2,700
Maine Water Company | Public utility, bonds | Other First Mortgage Bond | Minimum
Debt Instrument [Line Items]
Rate	8.95%
Maine Water Company | Public utility, bonds | Other First Mortgage Bond | Maximum
Debt Instrument [Line Items]
Rate	8.95%
Maine Water Company | Bank term loans
Debt Instrument [Line Items]
Total debt	$ 49,500	$ 34,500
Maine Water Company | Bank term loans | Minimum
Debt Instrument [Line Items]
Rate	3.89%
Maine Water Company | Bank term loans | Maximum
Debt Instrument [Line Items]
Rate	5.51%

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