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Long-Term Debt - Schedule of Long-term Debt Instruments (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Aug. 11, 2020	Mar. 12, 2020	Dec. 31, 2019
Debt Instrument [Line Items]
Long-term debt	$ 1,352,320			$ 1,292,586
Unamortized debt premium, net	22,479			25,020
Unamortized debt issuance costs	10,978			11,737
Current portion	76,241			22,272
Total long-term debt, less current portion	1,287,580			1,283,597
SJW Group
Debt Instrument [Line Items]
Current portion	49,929			0
Total long-term debt, less current portion	555,824			555,820
SJW Group | Senior notes
Debt Instrument [Line Items]
Long-term debt	$ 610,000			560,000
Stated interest rates		2.47%
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	4.35%
San Jose Water Company | California Pollution Control Financing Authority Revenue Bonds
Debt Instrument [Line Items]
Long-term debt	$ 440,000			450,000
San Jose Water Company | Senior notes
Debt Instrument [Line Items]
Long-term debt	$ 320,000			330,000
San Jose Water Company | Senior notes | Minimum
Debt Instrument [Line Items]
Stated interest rates	4.29%
San Jose Water Company | Senior notes | Maximum
Debt Instrument [Line Items]
Stated interest rates	8.58%
San Jose Water Company | Public utility, bonds | California Pollution Control Financing Authority Revenue Bonds
Debt Instrument [Line Items]
Long-term debt	$ 120,000			120,000
San Jose Water Company | Public utility, bonds | California Pollution Control Financing Authority Revenue Bonds | Minimum
Debt Instrument [Line Items]
Stated interest rates	4.75%
San Jose Water Company | Public utility, bonds | California Pollution Control Financing Authority Revenue Bonds | Maximum
Debt Instrument [Line Items]
Stated interest rates	5.10%
Connecticut Water Service, Inc. | Bank term loans
Debt Instrument [Line Items]
Long-term debt	$ 22,169			23,935
Connecticut Water Service, Inc. | Bank term loans | Minimum
Debt Instrument [Line Items]
Stated interest rates	4.09%
Connecticut Water Service, Inc. | Bank term loans | Maximum
Debt Instrument [Line Items]
Stated interest rates	4.15%
Connecticut Water Company
Debt Instrument [Line Items]
Long-term debt	$ 225,400			198,646
Connecticut Water Company | Senior notes
Debt Instrument [Line Items]
Long-term debt	$ 70,000			35,000
Stated interest rates			3.51%
Connecticut Water Company | Senior notes | Minimum
Debt Instrument [Line Items]
Stated interest rates	3.51%
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	$ 22,260			22,506
Stated interest rates	5.00%
Connecticut Water Company | Bank term loans
Debt Instrument [Line Items]
Long-term debt	$ 111,090			119,090
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. | Senior notes
Debt Instrument [Line Items]
Long-term debt	$ 15,000			15,000
Stated interest rates	6.27%
Maine Water Company
Debt Instrument [Line Items]
Long-term debt	$ 39,751			38,032
Maine Water Company | Public utility, bonds | State revolving fund loans
Debt Instrument [Line Items]
Long-term debt	$ 18,651			16,032
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 Bonds
Debt Instrument [Line Items]
Long-term debt	$ 3,600			4,500
Stated interest rates	8.95%
Maine Water Company | Bank term loans
Debt Instrument [Line Items]
Long-term debt	$ 17,500			17,500
Maine Water Company | Bank term loans | Minimum
Debt Instrument [Line Items]
Stated interest rates	4.18%
Maine Water Company | Bank term loans | Maximum
Debt Instrument [Line Items]
Stated interest rates	5.51%
Heritage Valley Water Company | Bank term loans
Debt Instrument [Line Items]
Long-term debt	$ 0			4,164
Stated interest rates	4.75%
Avon Water Company | Mortgages
Debt Instrument [Line Items]
Long-term debt	$ 0			$ 2,809
Stated interest rates	3.05%

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