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Long-Term Debt - Narrative (Details) - USD ($) | Dec. 01, 2021 | May 13, 2021 | Dec. 31, 2021 | Aug. 04, 2021 | Jun. 25, 2021 | Mar. 02, 2021 | Dec. 31, 2020 | Dec. 23, 2020 | Aug. 11, 2020 | Mar. 12, 2020
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Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Long-term debt |  |  | $ 1,522,955,000 |  |  |  | $ 1,352,320,000 |  |  |
SJW Group | Senior notes |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Long-term debt |  |  | $ 560,000,000 |  |  |  | 610,000,000 |  |  |
SJW Group | Senior notes | Maximum |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Stated interest rates |  |  | 3.53% |  |  |  |  |  |  |
SJW Group | Senior notes | 2.47% Senior Notes, Series 2020 |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Aggregate principal amount |  |  |  |  |  |  |  |  | $ 50,000,000 |
Stated interest rates |  |  |  |  |  |  |  |  | 2.47% |
SJWC | Senior notes |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Long-term debt |  |  | $ 420,000,000 |  |  |  | 320,000,000 |  |  |
SJWC | Senior notes | Maximum |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Stated interest rates |  |  | 8.58% |  |  |  |  |  |  |
SJWC | Senior notes | 3.00% Senior Notes, Series N |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Aggregate principal amount |  |  |  |  | $ 50,000,000 |  |  |  |  |
Stated interest rates |  |  |  |  | 3.00% |  |  |  |  |
SJWC | Senior notes | 3.00% Senior Notes, Series O |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Aggregate principal amount |  |  |  | $ 50,000,000 |  |  |  |  |  |
Stated interest rates |  |  |  | 3.00% |  |  |  |  |  |
Connecticut Water |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Long-term debt |  |  | $ 303,140,000 |  |  |  | 225,400,000 |  |  |
Connecticut Water | Senior notes |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Long-term debt |  |  | $ 170,000,000 |  |  |  | 70,000,000 |  |  |
Connecticut Water | Senior notes | Maximum |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Stated interest rates |  |  | 3.53% |  |  |  |  |  |  |
Connecticut Water | Senior notes | 3.07% Senior Notes, Series 2021A |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Aggregate principal amount |  |  |  | $ 50,000,000 |  |  |  |  |  |
Stated interest rates |  |  |  | 3.07% |  |  |  |  |  |
Connecticut Water | Senior notes | 3.10% Senior Notes, Series 2021B |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Aggregate principal amount | $ 50,000,000 |  |  |  |  |  |  |  |  |
Stated interest rates | 3.10% |  |  |  |  |  |  |  |  |
Connecticut Water | Senior notes | 3.51% Senior Notes, Due March 2050 |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Aggregate principal amount |  |  |  |  |  |  |  |  |  | $ 35,000,000
Stated interest rates |  |  |  |  |  |  |  |  |  | 3.51%
Connecticut Water | Bank term loans |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Long-term debt |  |  | $ 111,090,000 |  |  |  | 111,090,000 |  |  |
Connecticut Water | Bank term loans | Maximum |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Stated interest rates |  |  | 4.75% |  |  |  |  |  |  |
CLWSC | Bank term loans | 4.01% Note Due March 2041 |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Stated interest rates |  | 4.01% |  |  |  |  |  |  |  |
Proceeds from issuance of debt |  | $ 20,000,000 |  |  |  |  |  |  |  |
CLWSC | Bank term loans | 4.01% Note Due March 2041 | Maximum |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Aggregate principal amount |  | $ 30,000,000 |  |  |  |  |  |  |  |
CLWSC | Bank term loans | 4.11% Note Due March 2041 |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Stated interest rates | 4.11% |  |  |  |  |  |  |  |  |
Proceeds from issuance of debt | $ 10,000,000 |  |  |  |  |  |  |  |  |
Maine Water |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Long-term debt |  |  | $ 54,464,000 |  |  |  | 39,751,000 |  |  |
Maine Water | Bank term loans |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Long-term debt |  |  | $ 34,500,000 |  |  |  | 17,500,000 |  |  |
Maine Water | Bank term loans | Maximum |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Stated interest rates |  |  | 5.51% |  |  |  |  |  |  |
Maine Water | Bank term loans | 3.89% Note Due March 2041 |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Aggregate principal amount |  |  |  |  |  | $ 17,000,000 |  |  |  |
Stated interest rates |  |  |  |  |  | 3.89% |  |  |  |
Maine Water | Public utility, bonds | State Revolving Fund Loans Series T |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Stated interest rates |  |  |  |  |  |  |  | 1.00% |  |
Long-term debt |  |  |  |  |  |  |  | $ 4,000,000 |  |
Significant Observable Inputs (Level 2) |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Fair value of long-term debt |  |  | $ 1,651,825,000 |  |  |  | $ 1,570,727,000 |  |  |

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- Definition Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (b)(3) -URI http://asc.fasb.org/extlink&oid=123466204&loc=SL6031897-161870 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 55 -Paragraph 69C -URI http://asc.fasb.org/extlink&oid=123466577&loc=SL123495737-112612 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(16)) -URI http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910 Reference 4: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 55 -Paragraph 69B -URI http://asc.fasb.org/extlink&oid=123466577&loc=SL123495735-112612 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 1D -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123466505&loc=SL123495340-112611 Reference 7: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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