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SHORT-TERM BORROWINGS (Details) - USD ($) |  |  | 12 Months Ended
--- | --- | --- | ---
Mar. 29, 2019 | Oct. 04, 2011 | Dec. 31, 2020 | Dec. 31, 2019
Revolving Credit Facility |  |  |  |
Short-term borrowings |  |  |  |
Maximum borrowing capacity | $ 550,000,000.0 |  |  |
Debt maturity period | 5 years |  |  |
Line of credit facility, interest rate during period (as a percent) |  |  | 1.54% | 3.23%
Revolving Credit Facility | Minimum |  |  |  |
Short-term borrowings |  |  |  |
Debt maturity period | 1 month |  |  |
Revolving Credit Facility | Maximum |  |  |  |
Short-term borrowings |  |  |  |
Debt maturity period | 6 months |  |  |
Revolving Credit Facility | Eurodollar | Minimum |  |  |  |
Short-term borrowings |  |  |  |
Interest rate margin (as a percent) | 0.65% |  |  |
Revolving Credit Facility | Eurodollar | Maximum |  |  |  |
Short-term borrowings |  |  |  |
Interest rate margin (as a percent) | 0.875% |  |  |
Parent Company |  |  |  |
Short-term borrowings |  |  |  |
Amount outstanding under line of credit |  |  | $ 100,000,000.0 | $ 55,100,000
Parent Company | Revolving Credit Facility |  |  |  |
Short-term borrowings |  |  |  |
Maximum borrowing capacity | $ 150,000,000.0 |  |  |
Incremental expansion of borrowing capacity | 50,000,000.0 |  |  |
Cal Water |  |  |  |
Short-term borrowings |  |  |  |
Debt maturity period |  | 15 years |  |
Amount outstanding under line of credit |  |  | $ 270,000,000.0 | $ 120,000,000.0
Cal Water | Revolving Credit Facility |  |  |  |
Short-term borrowings |  |  |  |
Maximum borrowing capacity | $ 400,000,000.0 |  |  |
Debt maturity period | 24 months |  |  |
Incremental expansion of borrowing capacity | $ 150,000,000.0 |  |  |

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- Definition Line of Credit Facility, Incremental Expansion of Borrowing Capacity + References No definition available. + Details
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- Definition Percentage points added to the reference rate to compute the variable rate on the debt instrument. + References No definition available. + Details
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- Definition Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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- Definition The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement. + References Reference 1: 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 Reference 2: 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 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(16)) -URI http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910 + Details
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- Definition The effective interest rate during the reporting period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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