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N.S.C. Agua, S.A. de C.V. (Details Textual) | 3 Months Ended |  | 1 Months Ended |  | 0 Months Ended | 1 Months Ended | 3 Months Ended | 12 Months Ended |  |  |  | 3 Months Ended
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Mar. 31, 2015 USD ($) | Mar. 31, 2014 USD ($) | Dec. 31, 2014 USD ($) | Feb. 29, 2012 Option agreement [Member] USD ($) | Nov. 30, 2012 Minimum [Member] gal | Nov. 30, 2012 Maximum [Member] gal | May 15, 2014 N S C Agua [Member] USD ($) | May 31, 2014 N S C Agua [Member] USD ($) | Feb. 28, 2014 N S C Agua [Member] USD ($) | Oct. 31, 2013 N S C Agua [Member] USD ($) | May 31, 2013 N S C Agua [Member] USD ($) | Nov. 30, 2012 N S C Agua [Member] USD ($) sqft | May 31, 2010 N S C Agua [Member] gal | Mar. 31, 2015 N S C Agua [Member] USD ($) | Mar. 31, 2014 N S C Agua [Member] USD ($) | Dec. 31, 2012 N S C Agua [Member] USD ($) ha | Dec. 31, 2014 N S C Agua [Member] USD ($) | Dec. 31, 2013 N S C Agua [Member] ha | Feb. 29, 2012 N S C Agua [Member] | Mar. 31, 2015 N S C Agua [Member] London Interbank Offered Rate (LIBOR) [Member] | Mar. 31, 2015 N S C Agua [Member] Mexican Tax Authority [Member] USD ($) | Mar. 31, 2015 N S C Agua [Member] Mexican Tax Authority [Member] MXN | Mar. 31, 2015 N S C Agua [Member] Mexican Tax Authority [Member] Letter of Credit [Member] MXN
Schedule of Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners |  |  |  |  |  |  |  |  |  |  |  |  | 50.00%us-gaap_MinorityInterestOwnershipPercentageByNoncontrollingOwners / dei_LegalEntityAxis = cwco_NSCAguaMember |  |  |  |  |  |  |  |  |  |
Total Percentage Of Ownership Interest In An Acquired Company |  |  |  |  |  |  |  |  |  |  | 99.90%cwco_TotalPercentageOfOwnershipInterestInAcquiredCompany / dei_LegalEntityAxis = cwco_NSCAguaMember |  |  |  |  |  |  |  |  |  |  |  |
Seawater Reverse Osmosis Desalination Plant Per Day Processing Capacity |  |  |  |  |  |  |  |  |  |  |  |  | 100,000,000 cwco_SeawaterReverseOsmosisDesalinationPlantPerDayProcessingCapacity / dei_LegalEntityAxis = cwco_NSCAguaMember |  |  |  |  |  |  |  |  |  |
General and administrative expenses | $ 3,799,589 us-gaap_GeneralAndAdministrativeExpense | $ 5,342,633 us-gaap_GeneralAndAdministrativeExpense |  |  |  |  |  |  |  |  |  |  |  | $ 561,000 us-gaap_GeneralAndAdministrativeExpense / dei_LegalEntityAxis = cwco_NSCAguaMember | $ 2,000,000 us-gaap_GeneralAndAdministrativeExpense / dei_LegalEntityAxis = cwco_NSCAguaMember |  |  |  |  |  |  |  |
Payments to Acquire Land |  |  |  |  |  |  |  | 7,400,000 us-gaap_PaymentsToAcquireLand / dei_LegalEntityAxis = cwco_NSCAguaMember |  |  | 500,000 us-gaap_PaymentsToAcquireLand / dei_LegalEntityAxis = cwco_NSCAguaMember |  |  |  |  | 500,000 us-gaap_PaymentsToAcquireLand / dei_LegalEntityAxis = cwco_NSCAguaMember |  |  |  |  |  |  |
Further Required Payment As Compensation For Operation and Maintenance |  |  |  |  |  |  |  |  |  | 500,000 cwco_FurtherRequiredPaymentAsCompensationForOperationAndMaintenance / dei_LegalEntityAxis = cwco_NSCAguaMember |  |  |  |  |  |  |  |  |  |  |  |  |
Project Land Amount Paid |  |  |  |  |  |  | 10,000,000 cwco_ProjectLandAmountPaid / dei_LegalEntityAxis = cwco_NSCAguaMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Initial Amount Paid |  |  |  |  |  |  |  |  |  |  | 2,000,000 cwco_InitialAmountPaid / dei_LegalEntityAxis = cwco_NSCAguaMember |  |  |  |  |  |  |  |  |  |  |  |
Repayments of Short-term Debt |  |  |  |  |  |  |  |  |  |  | 5,700,000 us-gaap_RepaymentsOfShortTermDebt / dei_LegalEntityAxis = cwco_NSCAguaMember |  |  |  |  |  |  |  |  |  |  |  |
Lease Term |  |  |  |  |  |  |  |  |  |  |  | 20 years |  |  |  |  |  |  |  |  |  |  |
Assets | 160,033,680 us-gaap_Assets |  | 160,459,831 us-gaap_Assets |  |  |  |  |  |  |  |  |  |  | 22,000,000 us-gaap_Assets / dei_LegalEntityAxis = cwco_NSCAguaMember |  |  | 22,000,000 us-gaap_Assets / dei_LegalEntityAxis = cwco_NSCAguaMember |  |  |  |  |  |
Liabilities | 14,831,523 us-gaap_Liabilities |  | 16,377,167 us-gaap_Liabilities |  |  |  |  |  |  |  |  |  |  | 270,000 us-gaap_Liabilities / dei_LegalEntityAxis = cwco_NSCAguaMember |  |  | 214,000 us-gaap_Liabilities / dei_LegalEntityAxis = cwco_NSCAguaMember |  |  |  |  |  |
Payments for Compensation for Operation and Maintenance |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 350,000 cwco_PaymentsForCompensationForOperationAndMaintenance / dei_LegalEntityAxis = cwco_NSCAguaMember |  |  |  |  |  |  |  |
Land Subject to Ground Leases |  |  |  |  |  |  |  |  |  |  |  | 5,000 us-gaap_LandSubjectToGroundLeases / dei_LegalEntityAxis = cwco_NSCAguaMember |  |  |  |  |  |  |  |  |  |  |
Restricted Cash and Cash Equivalents | 442,955 us-gaap_RestrictedCashAndCashEquivalents |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating Leases, Rent Expense per month |  |  |  |  |  |  |  |  |  |  |  | 20,000 cwco_OperatingLeasesRentExpensePerMonth / dei_LegalEntityAxis = cwco_NSCAguaMember |  |  |  |  |  |  |  |  |  |  |
Land |  |  |  |  |  |  |  |  |  |  | 12,000,000 us-gaap_Land / dei_LegalEntityAxis = cwco_NSCAguaMember |  |  |  |  |  |  |  |  |  |  |  |
Income Tax Examination, Estimate of Possible Loss |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 379,000 us-gaap_IncomeTaxExaminationEstimateOfPossibleLoss / us-gaap_IncomeTaxAuthorityNameAxis = us-gaap_MexicanTaxAuthorityMember / dei_LegalEntityAxis = cwco_NSCAguaMember | 5,737,457 us-gaap_IncomeTaxExaminationEstimateOfPossibleLoss / us-gaap_IncomeTaxAuthorityNameAxis = us-gaap_MexicanTaxAuthorityMember / dei_LegalEntityAxis = cwco_NSCAguaMember |
Irrevocable letter of credit |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 6,712,634 cwco_IrrevocableLetterOfCredit / us-gaap_CreditFacilityAxis = us-gaap_LetterOfCreditMember / us-gaap_IncomeTaxAuthorityNameAxis = us-gaap_MexicanTaxAuthorityMember / dei_LegalEntityAxis = cwco_NSCAguaMember
Delivery Terms, Volume of water per day |  |  |  |  | 20,000,000 cwco_DeliveryTermsVolumeOfWaterPerDay / us-gaap_RangeAxis = us-gaap_MinimumMember | 40,000,000 cwco_DeliveryTermsVolumeOfWaterPerDay / us-gaap_RangeAxis = us-gaap_MaximumMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of Voting Interest Acquired through Loan Conversion |  |  |  |  |  |  |  |  |  |  | 99.90%cwco_PercentageOfVotingInterestAcquiredThroughLoanConversion / dei_LegalEntityAxis = cwco_NSCAguaMember |  |  |  |  |  |  |  |  |  |  |  |
Percentage of Voting Interest Acquired through Option Agreement |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 25.00%cwco_PercentageOfVotingInterestAcquiredThroughOptionAgreement / dei_LegalEntityAxis = cwco_NSCAguaMember |  |  |  |
Income Tax Examination, Penalties Estimate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,639,001 cwco_IncomeTaxExaminationPenaltiesEstimate / us-gaap_IncomeTaxAuthorityNameAxis = us-gaap_MexicanTaxAuthorityMember / dei_LegalEntityAxis = cwco_NSCAguaMember |
Loss Contingency, Additional Estimated Loss |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 975,177 cwco_LossContingencyAdditionalEstimatedLoss / us-gaap_CreditFacilityAxis = us-gaap_LetterOfCreditMember / us-gaap_IncomeTaxAuthorityNameAxis = us-gaap_MexicanTaxAuthorityMember / dei_LegalEntityAxis = cwco_NSCAguaMember
Area of Land |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 8.1 us-gaap_AreaOfLand / dei_LegalEntityAxis = cwco_NSCAguaMember |  | 12 us-gaap_AreaOfLand / dei_LegalEntityAxis = cwco_NSCAguaMember |  |  |  |  |
Income Tax Examination Estimate Related To Payments To Foreign Vendor |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3,184,745 cwco_IncomeTaxExaminationEstimateRelatedToPaymentsToForeignVendor / us-gaap_IncomeTaxAuthorityNameAxis = us-gaap_MexicanTaxAuthorityMember / dei_LegalEntityAxis = cwco_NSCAguaMember |
Payments For Option Agreement Exercised |  |  |  |  |  |  |  |  | 1,000,000 cwco_PaymentsForOptionAgreementExercised / dei_LegalEntityAxis = cwco_NSCAguaMember |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payments To Enter Option Agreement |  |  |  | 300,000 cwco_PaymentsToEnterOptionAgreement / us-gaap_StatementClassOfStockAxis = cwco_OptionAgreementMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Option Agreement Expiration Date |  |  |  | Feb. 07, 2014 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Tax Examination Surcharges Estimate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 913,711 cwco_IncomeTaxExaminationSurchargesEstimate / us-gaap_IncomeTaxAuthorityNameAxis = us-gaap_MexicanTaxAuthorityMember / dei_LegalEntityAxis = cwco_NSCAguaMember |  |
Loans Payable, Current | $ 8,500,000 us-gaap_LoansPayableCurrent |  | $ 9,000,000 us-gaap_LoansPayableCurrent |  |  |  |  | $ 10,000,000 us-gaap_LoansPayableCurrent / dei_LegalEntityAxis = cwco_NSCAguaMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility, Interest Rate Description |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | LIBOR plus 1.5% |  |  |

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Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration