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Accounting policies (Details 1) | 12 Months Ended
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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

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- Definition Represents the estimated fair value of reporting segments. + References No definition available. + Details
Name: | cwco_EstimatedFairValuePercentageSegmentReportingInformation
Namespace Prefix: | cwco_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=cwco_BulkMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=cwco_RetailMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |