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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