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Investment in OC-BVI (Details) (Ocean Conversion (BVI) Ltd [Member], USD $)
Dec. 31, 2014
Dec. 31, 2013
Ocean Conversion (BVI) Ltd [Member]
   
Schedule of Investments [Line Items]    
Current assets $ 2,547,542us-gaap_EquityMethodInvestmentSummarizedFinancialInformationCurrentAssets
/ dei_LegalEntityAxis
= cwco_OceanConversionBviLtdMember
$ 3,391,411us-gaap_EquityMethodInvestmentSummarizedFinancialInformationCurrentAssets
/ dei_LegalEntityAxis
= cwco_OceanConversionBviLtdMember
Non-current assets 5,297,904us-gaap_EquityMethodInvestmentSummarizedFinancialInformationNoncurrentAssets
/ dei_LegalEntityAxis
= cwco_OceanConversionBviLtdMember
5,954,304us-gaap_EquityMethodInvestmentSummarizedFinancialInformationNoncurrentAssets
/ dei_LegalEntityAxis
= cwco_OceanConversionBviLtdMember
Total assets 7,845,446us-gaap_EquityMethodInvestmentSummarizedFinancialInformationAssets
/ dei_LegalEntityAxis
= cwco_OceanConversionBviLtdMember
9,345,715us-gaap_EquityMethodInvestmentSummarizedFinancialInformationAssets
/ dei_LegalEntityAxis
= cwco_OceanConversionBviLtdMember
Current liabilities 427,269us-gaap_EquityMethodInvestmentSummarizedFinancialInformationCurrentLiabilities
/ dei_LegalEntityAxis
= cwco_OceanConversionBviLtdMember
717,887us-gaap_EquityMethodInvestmentSummarizedFinancialInformationCurrentLiabilities
/ dei_LegalEntityAxis
= cwco_OceanConversionBviLtdMember
Non-current liabilities 1,393,200us-gaap_EquityMethodInvestmentSummarizedFinancialInformationNoncurrentLiabilities
/ dei_LegalEntityAxis
= cwco_OceanConversionBviLtdMember
1,688,850us-gaap_EquityMethodInvestmentSummarizedFinancialInformationNoncurrentLiabilities
/ dei_LegalEntityAxis
= cwco_OceanConversionBviLtdMember
Total liabilities $ 1,820,469us-gaap_EquityMethodInvestmentSummarizedFinancialInformationLiabilities
/ dei_LegalEntityAxis
= cwco_OceanConversionBviLtdMember
$ 2,406,737us-gaap_EquityMethodInvestmentSummarizedFinancialInformationLiabilities
/ dei_LegalEntityAxis
= cwco_OceanConversionBviLtdMember