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v2.4.0.6

Accounting policies (Details1) | 12 Months Ended
--- | ---
Dec. 31, 2012 | Dec. 31, 2011
Retail [Member] |  |
Estimated Fair Value,Percentage Segment Reporting Information | 100.00% | 100.00%
Retail [Member] | Discounted Cash Flow Method [Member] |  |
Estimated Fair Value,Percentage Segment Reporting Information | 20.00% | 20.00%
Retail [Member] | Subject Company Stock Price Method [Member] |  |
Estimated Fair Value,Percentage Segment Reporting Information | 60.00% | 40.00%
Retail [Member] | Guideline Public Company Method [Member] |  |
Estimated Fair Value,Percentage Segment Reporting Information | 10.00% | 20.00%
Retail [Member] | Mergers and Acquisitions Method [Member] |  |
Estimated Fair Value,Percentage Segment Reporting Information | 10.00% | 20.00%
Bulk [Member] |  |
Estimated Fair Value,Percentage Segment Reporting Information | 100.00% | 100.00%
Bulk [Member] | Discounted Cash Flow Method [Member] |  |
Estimated Fair Value,Percentage Segment Reporting Information | 30.00% | 10.00%
Bulk [Member] | Subject Company Stock Price Method [Member] |  |
Estimated Fair Value,Percentage Segment Reporting Information | 50.00% | 10.00%
Bulk [Member] | Guideline Public Company Method [Member] |  |
Estimated Fair Value,Percentage Segment Reporting Information | 10.00% | 40.00%
Bulk [Member] | Mergers and Acquisitions Method [Member] |  |
Estimated Fair Value,Percentage Segment Reporting Information | 10.00% | 40.00%
Services [Member] |  |
Estimated Fair Value,Percentage Segment Reporting Information | 100.00% | 100.00%
Services [Member] | Discounted Cash Flow Method [Member] |  |
Estimated Fair Value,Percentage Segment Reporting Information |  | 20.00%
Services [Member] | Subject Company Stock Price Method [Member] |  |
Estimated Fair Value,Percentage Segment Reporting Information | 10.00% | 80.00%
Services [Member] | Net Asset Value [Member] |  |
Estimated Fair Value,Percentage Segment Reporting Information | 90.00% |

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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