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Cost of revenues and general and administrative expenses (Details 1) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Cost of revenues and general and administrative expenses [Line Items]
General and Administrative Expense	$ 16,654,439us-gaap_GeneralAndAdministrativeExpense	$ 15,844,303us-gaap_GeneralAndAdministrativeExpense	$ 14,542,817us-gaap_GeneralAndAdministrativeExpense
Employee costs [Member]
Cost of revenues and general and administrative expenses [Line Items]
General and Administrative Expense	6,314,908us-gaap_GeneralAndAdministrativeExpense / us-gaap_ConcentrationRiskByBenchmarkAxis = cwco_EmployeeCostsMember	6,218,948us-gaap_GeneralAndAdministrativeExpense / us-gaap_ConcentrationRiskByBenchmarkAxis = cwco_EmployeeCostsMember	5,751,142us-gaap_GeneralAndAdministrativeExpense / us-gaap_ConcentrationRiskByBenchmarkAxis = cwco_EmployeeCostsMember
Insurance [Member]
Cost of revenues and general and administrative expenses [Line Items]
General and Administrative Expense	923,089us-gaap_GeneralAndAdministrativeExpense / us-gaap_ConcentrationRiskByBenchmarkAxis = cwco_InsuranceMember	969,370us-gaap_GeneralAndAdministrativeExpense / us-gaap_ConcentrationRiskByBenchmarkAxis = cwco_InsuranceMember	968,662us-gaap_GeneralAndAdministrativeExpense / us-gaap_ConcentrationRiskByBenchmarkAxis = cwco_InsuranceMember
Professional fees [Member]
Cost of revenues and general and administrative expenses [Line Items]
General and Administrative Expense	1,424,927us-gaap_GeneralAndAdministrativeExpense / us-gaap_ConcentrationRiskByBenchmarkAxis = cwco_ProfessionalsFeeMember	1,005,495us-gaap_GeneralAndAdministrativeExpense / us-gaap_ConcentrationRiskByBenchmarkAxis = cwco_ProfessionalsFeeMember	1,183,660us-gaap_GeneralAndAdministrativeExpense / us-gaap_ConcentrationRiskByBenchmarkAxis = cwco_ProfessionalsFeeMember
Directors' fees and expenses [Member]
Cost of revenues and general and administrative expenses [Line Items]
General and Administrative Expense	686,228us-gaap_GeneralAndAdministrativeExpense / us-gaap_ConcentrationRiskByBenchmarkAxis = cwco_DirectorsFeesAndExpensesMember	752,044us-gaap_GeneralAndAdministrativeExpense / us-gaap_ConcentrationRiskByBenchmarkAxis = cwco_DirectorsFeesAndExpensesMember	533,715us-gaap_GeneralAndAdministrativeExpense / us-gaap_ConcentrationRiskByBenchmarkAxis = cwco_DirectorsFeesAndExpensesMember
Depreciation [Member]
Cost of revenues and general and administrative expenses [Line Items]
General and Administrative Expense	278,478us-gaap_GeneralAndAdministrativeExpense / us-gaap_ConcentrationRiskByBenchmarkAxis = cwco_DepreciationMember	290,622us-gaap_GeneralAndAdministrativeExpense / us-gaap_ConcentrationRiskByBenchmarkAxis = cwco_DepreciationMember	421,851us-gaap_GeneralAndAdministrativeExpense / us-gaap_ConcentrationRiskByBenchmarkAxis = cwco_DepreciationMember
NSC project expenses [Member]
Cost of revenues and general and administrative expenses [Line Items]
General and Administrative Expense	3,702,332us-gaap_GeneralAndAdministrativeExpense / us-gaap_ConcentrationRiskByBenchmarkAxis = cwco_NscProjectExpensesMember	3,158,309us-gaap_GeneralAndAdministrativeExpense / us-gaap_ConcentrationRiskByBenchmarkAxis = cwco_NscProjectExpensesMember	1,656,831us-gaap_GeneralAndAdministrativeExpense / us-gaap_ConcentrationRiskByBenchmarkAxis = cwco_NscProjectExpensesMember
Other [Member]
Cost of revenues and general and administrative expenses [Line Items]
General and Administrative Expense	$ 3,324,477us-gaap_GeneralAndAdministrativeExpense / us-gaap_ConcentrationRiskByBenchmarkAxis = cwco_OtherCreditDeviceMember	$ 3,449,515us-gaap_GeneralAndAdministrativeExpense / us-gaap_ConcentrationRiskByBenchmarkAxis = cwco_OtherCreditDeviceMember	$ 4,026,956us-gaap_GeneralAndAdministrativeExpense / us-gaap_ConcentrationRiskByBenchmarkAxis = cwco_OtherCreditDeviceMember

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- Definition

The aggregate total of expenses of managing and administering the affairs of an entity, including affiliates of the reporting entity, which are not directly or indirectly associated with the manufacture, sale or creation of a product or product line.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 225

-SubTopic 10

-Section S99

-Paragraph 2

-Subparagraph (SX 210.5-03.4)

-URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688

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