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Leases - Additional Information (Details)	Sep. 30, 2020
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
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: