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Leases - Additional Information (Details) | Sep. 30, 2020
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Aguas de Rosarito S.A.P.I. de C.V [Member] |
Lessee, Operating Lease, Renewal Term | 20 years

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- Definition Term of lessee's operating lease renewal, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=121609121&loc=SL77918673-209980 + Details
Name: | us-gaap_LesseeOperatingLeaseRenewalTerm
Namespace Prefix: | us-gaap_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | instant

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- Details
Name: | srt_ConsolidatedEntitiesAxis=cwco_AguasDeRosaritoSapiDeCvMember
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Data Type: | na
Balance Type: |
Period Type: |