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Long-Term Debt - Schedule of Long-term Debt Instruments (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Debt Instrument [Line Items]
Long-term debt	$ 1,522,955	$ 1,352,320
Unamortized debt premium, net	19,937	22,479
Unamortized debt issuance costs	(10,851)	(10,978)
Current portion	(39,106)	(76,241)
Total long-term debt, less current portion	1,492,935	1,287,580
SJW Group
Debt Instrument [Line Items]
Current portion	0	(49,929)
Total long-term debt, less current portion	556,225	555,824
SJW Group | Senior notes
Debt Instrument [Line Items]
Long-term debt	$ 560,000	610,000
SJW Group | Senior notes | Minimum
Debt Instrument [Line Items]
Stated interest rates	2.47%
SJW Group | Senior notes | Maximum
Debt Instrument [Line Items]
Stated interest rates	3.53%
SJWC | California Pollution Control Financing Authority Revenue Bonds
Debt Instrument [Line Items]
Long-term debt	$ 540,000	440,000
SJWC | Senior notes
Debt Instrument [Line Items]
Long-term debt	$ 420,000	320,000
SJWC | Senior notes | Minimum
Debt Instrument [Line Items]
Stated interest rates	3.00%
SJWC | Senior notes | Maximum
Debt Instrument [Line Items]
Stated interest rates	8.58%
SJWC | Public utility, bonds | California Pollution Control Financing Authority Revenue Bonds
Debt Instrument [Line Items]
Long-term debt	$ 120,000	120,000
SJWC | Public utility, bonds | California Pollution Control Financing Authority Revenue Bonds | Minimum
Debt Instrument [Line Items]
Stated interest rates	4.75%
SJWC | Public utility, bonds | California Pollution Control Financing Authority Revenue Bonds | Maximum
Debt Instrument [Line Items]
Stated interest rates	5.10%
CTWS | Bank term loans
Debt Instrument [Line Items]
Long-term debt	$ 20,351	22,169
CTWS | Bank term loans | Minimum
Debt Instrument [Line Items]
Stated interest rates	4.09%
CTWS | Bank term loans | Maximum
Debt Instrument [Line Items]
Stated interest rates	4.15%
Connecticut Water Company
Debt Instrument [Line Items]
Long-term debt	$ 303,140	225,400
Connecticut Water Company | Senior notes
Debt Instrument [Line Items]
Long-term debt	$ 170,000	70,000
Connecticut Water Company | Senior notes | Minimum
Debt Instrument [Line Items]
Stated interest rates	3.07%
Connecticut Water Company | Senior notes | Maximum
Debt Instrument [Line Items]
Stated interest rates	3.53%
Connecticut Water Company | Public utility, bonds | Connecticut Innovations Revenue Bonds, variable rate
Debt Instrument [Line Items]
Long-term debt	$ 22,050	22,050
Connecticut Water Company | Public utility, bonds | Connecticut Innovations Revenue Bonds, fixed rate
Debt Instrument [Line Items]
Long-term debt	0	22,260
Connecticut Water Company | Bank term loans
Debt Instrument [Line Items]
Long-term debt	$ 111,090	111,090
Connecticut Water Company | Bank term loans | Minimum
Debt Instrument [Line Items]
Stated interest rates	3.51%
Connecticut Water Company | Bank term loans | Maximum
Debt Instrument [Line Items]
Stated interest rates	4.75%
SJWTX, Inc.
Debt Instrument [Line Items]
Long-term debt	$ 45,000	15,000
SJWTX, Inc. | Senior notes
Debt Instrument [Line Items]
Long-term debt	$ 15,000	15,000
SJWTX, Inc. | Senior notes | Minimum
Debt Instrument [Line Items]
Stated interest rates	6.27%
SJWTX, Inc. | Senior notes | Maximum
Debt Instrument [Line Items]
Stated interest rates	6.27%
SJWTX, Inc. | Bank term loans
Debt Instrument [Line Items]
Long-term debt	$ 30,000	0
SJWTX, Inc. | Bank term loans | Minimum
Debt Instrument [Line Items]
Stated interest rates	4.01%
SJWTX, Inc. | Bank term loans | Maximum
Debt Instrument [Line Items]
Stated interest rates	4.11%
Maine Water Company
Debt Instrument [Line Items]
Long-term debt	$ 54,464	39,751
Maine Water Company | Public utility, bonds | State revolving fund loans
Debt Instrument [Line Items]
Long-term debt	$ 17,264	18,651
Maine Water Company | Public utility, bonds | State revolving fund loans | Minimum
Debt Instrument [Line Items]
Stated interest rates	0.00%
Maine Water Company | Public utility, bonds | State revolving fund loans | Maximum
Debt Instrument [Line Items]
Stated interest rates	2.58%
Maine Water Company | Public utility, bonds | Other First Mortgage Bond
Debt Instrument [Line Items]
Long-term debt	$ 2,700	3,600
Maine Water Company | Public utility, bonds | Other First Mortgage Bond | Minimum
Debt Instrument [Line Items]
Stated interest rates	8.95%
Maine Water Company | Public utility, bonds | Other First Mortgage Bond | Maximum
Debt Instrument [Line Items]
Stated interest rates	8.95%
Maine Water Company | Bank term loans
Debt Instrument [Line Items]
Long-term debt	$ 34,500	$ 17,500
Maine Water Company | Bank term loans | Minimum
Debt Instrument [Line Items]
Stated interest rates	3.89%
Maine Water Company | Bank term loans | Maximum
Debt Instrument [Line Items]
Stated interest rates	5.51%

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