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v2.4.1.9

Intangible assets (Details Textual) (USD $) | 1 Months Ended | 12 Months Ended
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Feb. 29, 2012 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Finite Lived Intangible Asset Amortization Period | 1 year |  |  |
Payment For Nsc Option Agreement |  | $ 0 cwco_PaymenTforNscOptionAgreement | $ 0 cwco_PaymenTforNscOptionAgreement | $ 300,000 cwco_PaymenTforNscOptionAgreement
Option agreement [Member] |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Payment For Nsc Option Agreement | 300,000 cwco_PaymenTforNscOptionAgreement / us-gaap_FinancialInstrumentAxis = cwco_OptionAgreementMember |  |  |
Belize Water Production And Supply Agreement [Member] |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Finite Lived Intangible Asset Amortization Period |  | 23 years |  |
Desal Co [Member] |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Business Acquisition, Percentage of Voting Interests Acquired |  | 100.00%us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired / dei_LegalEntityAxis = cwco_DesalCoMember |  |

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- Definition Represents the amortization period of finite lived intangible asset. + References No definition available. + Details
Name: | cwco_FiniteLivedintangibleAssetAmortizationPeriod
Namespace Prefix: | cwco_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Definition The cash outflow for NSC option agreement. + References No definition available. + Details
Name: | cwco_PaymenTforNscOptionAgreement
Namespace Prefix: | cwco_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Percentage of voting equity interests acquired at the acquisition date in the business combination. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=25497992&loc=d3e1392-128463 + Details
Name: | us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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- Details
Name: | us-gaap_FiniteLivedIntangibleAssetsLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | dei_LegalEntityAxis=cwco_DesalCoMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_FinancialInstrumentAxis=cwco_OptionAgreementMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis=cwco_BelizeWaterProductionAndSupplyAgreementMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |