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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Advances for Construction (Details) $ in Thousands | Dec. 31, 2020 USD ($)
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Accounting Policies [Abstract] |
2021 | $ 8,935
2022 | 8,841
2023 | 8,791
2024 | 8,689
2025 | 8,434
Thereafter | 151,935
Total refunds | $ 195,625

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- Definition Customer Advances For Construction Refunds Due + References No definition available. + Details
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Namespace Prefix: | cwt_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Customer Advances For Construction Refunds Due Thereafter + References No definition available. + Details
Name: | cwt_CustomerAdvancesForConstructionRefundsDueThereafter
Namespace Prefix: | cwt_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Represents the amount of advances for construction expected to be refunded to customers during year five of the five succeeding fiscal years. + References No definition available. + Details
Name: | cwt_CustomerAdvancesForConstructionRefundsDueYearFive
Namespace Prefix: | cwt_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
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- Definition Represents the amount of advances for construction expected to be refunded to customers during year four of the five succeeding fiscal years. + References No definition available. + Details
Name: | cwt_CustomerAdvancesForConstructionRefundsDueYearFour
Namespace Prefix: | cwt_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Represents the amount of advances for construction expected to be refunded to customers during year one of the five succeeding fiscal years. + References No definition available. + Details
Name: | cwt_CustomerAdvancesForConstructionRefundsDueYearOne
Namespace Prefix: | cwt_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Represents the amount of advances for construction expected to be refunded to customers during year three of the five succeeding fiscal years. + References No definition available. + Details
Name: | cwt_CustomerAdvancesForConstructionRefundsDueYearThree
Namespace Prefix: | cwt_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Represents the amount of advances for construction expected to be refunded to customers during year two of the five succeeding fiscal years. + References No definition available. + Details
Name: | cwt_CustomerAdvancesForConstructionRefundsDueYearTwo
Namespace Prefix: | cwt_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- References No definition available. + Details
Name: | us-gaap_AccountingPoliciesAbstract
Namespace Prefix: | us-gaap_
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