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Accounting policies (Details 1)
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Retail [Member]    
Estimated Fair Value Percentage Segment Reporting Information 100.00%cwco_EstimatedFairValuePercentageSegmentReportingInformation
/ us-gaap_StatementBusinessSegmentsAxis
= cwco_RetailMember		 100.00%cwco_EstimatedFairValuePercentageSegmentReportingInformation
/ us-gaap_StatementBusinessSegmentsAxis
= cwco_RetailMember
Retail [Member] | Discounted cash flow [Member]    
Estimated Fair Value Percentage Segment Reporting Information 50.00%cwco_EstimatedFairValuePercentageSegmentReportingInformation
/ cwco_FairValueDeterminingMethodAxis
= cwco_DiscountedCashFlowMethodMember
/ us-gaap_StatementBusinessSegmentsAxis
= cwco_RetailMember		 50.00%cwco_EstimatedFairValuePercentageSegmentReportingInformation
/ cwco_FairValueDeterminingMethodAxis
= cwco_DiscountedCashFlowMethodMember
/ us-gaap_StatementBusinessSegmentsAxis
= cwco_RetailMember
Retail [Member] | Subject company stock price [Member]    
Estimated Fair Value Percentage Segment Reporting Information 30.00%cwco_EstimatedFairValuePercentageSegmentReportingInformation
/ cwco_FairValueDeterminingMethodAxis
= cwco_SubjectCompanyStockPriceMethodMember
/ us-gaap_StatementBusinessSegmentsAxis
= cwco_RetailMember		 30.00%cwco_EstimatedFairValuePercentageSegmentReportingInformation
/ cwco_FairValueDeterminingMethodAxis
= cwco_SubjectCompanyStockPriceMethodMember
/ us-gaap_StatementBusinessSegmentsAxis
= cwco_RetailMember
Retail [Member] | Guideline public company [Member]    
Estimated Fair Value Percentage Segment Reporting Information 10.00%cwco_EstimatedFairValuePercentageSegmentReportingInformation
/ cwco_FairValueDeterminingMethodAxis
= cwco_GuidelinePublicCompanyMethodMember
/ us-gaap_StatementBusinessSegmentsAxis
= cwco_RetailMember		 10.00%cwco_EstimatedFairValuePercentageSegmentReportingInformation
/ cwco_FairValueDeterminingMethodAxis
= cwco_GuidelinePublicCompanyMethodMember
/ us-gaap_StatementBusinessSegmentsAxis
= cwco_RetailMember
Retail [Member] | Mergers and acquisitions [Member]    
Estimated Fair Value Percentage Segment Reporting Information 10.00%cwco_EstimatedFairValuePercentageSegmentReportingInformation
/ cwco_FairValueDeterminingMethodAxis
= cwco_MergersAndAcquisitionsMethodMember
/ us-gaap_StatementBusinessSegmentsAxis
= cwco_RetailMember		 10.00%cwco_EstimatedFairValuePercentageSegmentReportingInformation
/ cwco_FairValueDeterminingMethodAxis
= cwco_MergersAndAcquisitionsMethodMember
/ us-gaap_StatementBusinessSegmentsAxis
= cwco_RetailMember
Bulk [Member]    
Estimated Fair Value Percentage Segment Reporting Information 100.00%cwco_EstimatedFairValuePercentageSegmentReportingInformation
/ us-gaap_StatementBusinessSegmentsAxis
= cwco_BulkMember		 100.00%cwco_EstimatedFairValuePercentageSegmentReportingInformation
/ us-gaap_StatementBusinessSegmentsAxis
= cwco_BulkMember
Bulk [Member] | Discounted cash flow [Member]    
Estimated Fair Value Percentage Segment Reporting Information 50.00%cwco_EstimatedFairValuePercentageSegmentReportingInformation
/ cwco_FairValueDeterminingMethodAxis
= cwco_DiscountedCashFlowMethodMember
/ us-gaap_StatementBusinessSegmentsAxis
= cwco_BulkMember		 50.00%cwco_EstimatedFairValuePercentageSegmentReportingInformation
/ cwco_FairValueDeterminingMethodAxis
= cwco_DiscountedCashFlowMethodMember
/ us-gaap_StatementBusinessSegmentsAxis
= cwco_BulkMember
Bulk [Member] | Subject company stock price [Member]    
Estimated Fair Value Percentage Segment Reporting Information 30.00%cwco_EstimatedFairValuePercentageSegmentReportingInformation
/ cwco_FairValueDeterminingMethodAxis
= cwco_SubjectCompanyStockPriceMethodMember
/ us-gaap_StatementBusinessSegmentsAxis
= cwco_BulkMember		 30.00%cwco_EstimatedFairValuePercentageSegmentReportingInformation
/ cwco_FairValueDeterminingMethodAxis
= cwco_SubjectCompanyStockPriceMethodMember
/ us-gaap_StatementBusinessSegmentsAxis
= cwco_BulkMember
Bulk [Member] | Guideline public company [Member]    
Estimated Fair Value Percentage Segment Reporting Information 10.00%cwco_EstimatedFairValuePercentageSegmentReportingInformation
/ cwco_FairValueDeterminingMethodAxis
= cwco_GuidelinePublicCompanyMethodMember
/ us-gaap_StatementBusinessSegmentsAxis
= cwco_BulkMember		 10.00%cwco_EstimatedFairValuePercentageSegmentReportingInformation
/ cwco_FairValueDeterminingMethodAxis
= cwco_GuidelinePublicCompanyMethodMember
/ us-gaap_StatementBusinessSegmentsAxis
= cwco_BulkMember
Bulk [Member] | Mergers and acquisitions [Member]    
Estimated Fair Value Percentage Segment Reporting Information 10.00%cwco_EstimatedFairValuePercentageSegmentReportingInformation
/ cwco_FairValueDeterminingMethodAxis
= cwco_MergersAndAcquisitionsMethodMember
/ us-gaap_StatementBusinessSegmentsAxis
= cwco_BulkMember		 10.00%cwco_EstimatedFairValuePercentageSegmentReportingInformation
/ cwco_FairValueDeterminingMethodAxis
= cwco_MergersAndAcquisitionsMethodMember
/ us-gaap_StatementBusinessSegmentsAxis
= cwco_BulkMember