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Accounting policies (Details 1) | 12 Months Ended
--- | ---
Dec. 31, 2013 | Dec. 31, 2012
Retail [Member] |  |
Accounting Policies [Line Items] |  |
Estimated Fair Value Percentage Segment Reporting Information | 100.00% | 100.00%
Retail [Member] | Discounted cash flow [Member] |  |
Accounting Policies [Line Items] |  |
Estimated Fair Value Percentage Segment Reporting Information | 50.00% | 20.00%
Retail [Member] | Subject company stock price [Member] |  |
Accounting Policies [Line Items] |  |
Estimated Fair Value Percentage Segment Reporting Information | 30.00% | 60.00%
Retail [Member] | Guideline Public Company [Member] |  |
Accounting Policies [Line Items] |  |
Estimated Fair Value Percentage Segment Reporting Information | 10.00% | 10.00%
Retail [Member] | Mergers And Acquisitions [Member] |  |
Accounting Policies [Line Items] |  |
Estimated Fair Value Percentage Segment Reporting Information | 10.00% | 10.00%
Bulk [Member] |  |
Accounting Policies [Line Items] |  |
Estimated Fair Value Percentage Segment Reporting Information | 100.00% | 100.00%
Bulk [Member] | Discounted cash flow [Member] |  |
Accounting Policies [Line Items] |  |
Estimated Fair Value Percentage Segment Reporting Information | 50.00% | 30.00%
Bulk [Member] | Subject company stock price [Member] |  |
Accounting Policies [Line Items] |  |
Estimated Fair Value Percentage Segment Reporting Information | 30.00% | 50.00%
Bulk [Member] | Guideline Public Company [Member] |  |
Accounting Policies [Line Items] |  |
Estimated Fair Value Percentage Segment Reporting Information | 10.00% | 10.00%
Bulk [Member] | Mergers And Acquisitions [Member] |  |
Accounting Policies [Line Items] |  |
Estimated Fair Value Percentage Segment Reporting Information | 10.00% | 10.00%
Services [Member] |  |
Accounting Policies [Line Items] |  |
Estimated Fair Value Percentage Segment Reporting Information |  | 100.00%
Services [Member] | Subject company stock price [Member] |  |
Accounting Policies [Line Items] |  |
Estimated Fair Value Percentage Segment Reporting Information |  | 10.00%
Services [Member] | Net Asset Value [Member] |  |
Accounting Policies [Line Items] |  |
Estimated Fair Value Percentage Segment Reporting Information |  | 90.00%

X
- Details
Name: | cwco_AccountingPoliciesLineItems
Namespace Prefix: | cwco_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- 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