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Investment in OC-BVI (Details) (Ocean Conversion (BVI) Ltd [Member], USD $)
Mar. 31, 2015
Dec. 31, 2014
Ocean Conversion (BVI) Ltd [Member]
   
Condensed Balance Sheet Statements, Captions [Line Items]    
Current assets $ 3,168,940us-gaap_EquityMethodInvestmentSummarizedFinancialInformationCurrentAssets
/ dei_LegalEntityAxis
= cwco_OceanConversionBviLtdMember
$ 2,547,542us-gaap_EquityMethodInvestmentSummarizedFinancialInformationCurrentAssets
/ dei_LegalEntityAxis
= cwco_OceanConversionBviLtdMember
Non-current assets 5,116,946us-gaap_EquityMethodInvestmentSummarizedFinancialInformationNoncurrentAssets
/ dei_LegalEntityAxis
= cwco_OceanConversionBviLtdMember
5,297,904us-gaap_EquityMethodInvestmentSummarizedFinancialInformationNoncurrentAssets
/ dei_LegalEntityAxis
= cwco_OceanConversionBviLtdMember
Total assets 8,285,886us-gaap_EquityMethodInvestmentSummarizedFinancialInformationAssets
/ dei_LegalEntityAxis
= cwco_OceanConversionBviLtdMember
7,845,446us-gaap_EquityMethodInvestmentSummarizedFinancialInformationAssets
/ dei_LegalEntityAxis
= cwco_OceanConversionBviLtdMember
Current liabilities 624,794us-gaap_EquityMethodInvestmentSummarizedFinancialInformationCurrentLiabilities
/ dei_LegalEntityAxis
= cwco_OceanConversionBviLtdMember
427,269us-gaap_EquityMethodInvestmentSummarizedFinancialInformationCurrentLiabilities
/ dei_LegalEntityAxis
= cwco_OceanConversionBviLtdMember
Non-current liabilities 1,445,849us-gaap_EquityMethodInvestmentSummarizedFinancialInformationNoncurrentLiabilities
/ dei_LegalEntityAxis
= cwco_OceanConversionBviLtdMember
1,393,200us-gaap_EquityMethodInvestmentSummarizedFinancialInformationNoncurrentLiabilities
/ dei_LegalEntityAxis
= cwco_OceanConversionBviLtdMember
Total liabilities $ 2,070,643us-gaap_EquityMethodInvestmentSummarizedFinancialInformationLiabilities
/ dei_LegalEntityAxis
= cwco_OceanConversionBviLtdMember
$ 1,820,469us-gaap_EquityMethodInvestmentSummarizedFinancialInformationLiabilities
/ dei_LegalEntityAxis
= cwco_OceanConversionBviLtdMember