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Retail segment contingency (Details Textual) (USD $) | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2013 | Jun. 30, 2012 | Jun. 30, 2013 | Jun. 30, 2012 | Dec. 31, 2012
Goodwill | $ 3,499,037 |  | $ 3,499,037 |  | $ 3,499,037
Retail Water Revenue Percentage | 37.00% | 36.00% | 38.00% | 38.00% |
Retail Water Gross Profit Percentage | 52.00% | 55.00% | 54.00% | 57.00% |
Retail Segment [Member] |  |  |  |  |
Goodwill | $ 3,499,037 |  | $ 3,499,037 |  |

X
- Definition Represents the percentage of consolidated gross profit from retail water operations. + References No definition available. + Details
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Namespace Prefix: | cwco_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the percentage of consolidated revenue from retail water operations. + References No definition available. + Details
Name: | cwco_RetailWaterRevenuePercentage
Namespace Prefix: | cwco_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=14024403&loc=d3e13816-109267 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266 + Details
Name: | us-gaap_Goodwill
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant