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Segment information (Details 2) (USD $)
Dec. 31, 2014
Dec. 31, 2013
Segment Reporting Information [Line Items]    
Property, Plant and Equipment, Net $ 56,396,988us-gaap_PropertyPlantAndEquipmentNet $ 58,602,886us-gaap_PropertyPlantAndEquipmentNet
Cayman Island operations [Member]    
Segment Reporting Information [Line Items]    
Property, Plant and Equipment, Net 23,284,843us-gaap_PropertyPlantAndEquipmentNet
/ us-gaap_StatementGeographicalAxis
= country_KY
23,907,080us-gaap_PropertyPlantAndEquipmentNet
/ us-gaap_StatementGeographicalAxis
= country_KY
Bahamas operations [Member]    
Segment Reporting Information [Line Items]    
Property, Plant and Equipment, Net 28,073,948us-gaap_PropertyPlantAndEquipmentNet
/ us-gaap_StatementGeographicalAxis
= country_BS
30,589,189us-gaap_PropertyPlantAndEquipmentNet
/ us-gaap_StatementGeographicalAxis
= country_BS
Belize operations [Member]    
Segment Reporting Information [Line Items]    
Property, Plant and Equipment, Net 1,025,970us-gaap_PropertyPlantAndEquipmentNet
/ us-gaap_StatementGeographicalAxis
= country_BZ
1,046,184us-gaap_PropertyPlantAndEquipmentNet
/ us-gaap_StatementGeographicalAxis
= country_BZ
Indonesia operations [Member]    
Segment Reporting Information [Line Items]    
Property, Plant and Equipment, Net 3,245,846us-gaap_PropertyPlantAndEquipmentNet
/ us-gaap_StatementGeographicalAxis
= country_ID
2,422,552us-gaap_PropertyPlantAndEquipmentNet
/ us-gaap_StatementGeographicalAxis
= country_ID
All other country operations [Member]    
Segment Reporting Information [Line Items]    
Property, Plant and Equipment, Net $ 766,381us-gaap_PropertyPlantAndEquipmentNet
/ us-gaap_StatementGeographicalAxis
= cwco_AllOtherCountriesMember
$ 637,881us-gaap_PropertyPlantAndEquipmentNet
/ us-gaap_StatementGeographicalAxis
= cwco_AllOtherCountriesMember