XML 69 R55.htm IDEA: XBRL DOCUMENT
v3.8.0.1

Accounting policies (Details 1) | 12 Months Ended
--- | ---
Dec. 31, 2017
Retail [Member] |
Estimated Fair Value Percentage Segment Reporting Information | 100.00%
Retail [Member] | Discounted cash flow [Member] |
Estimated Fair Value Percentage Segment Reporting Information | 80.00%
Retail [Member] | Guideline public company [Member] |
Estimated Fair Value Percentage Segment Reporting Information | 10.00%
Retail [Member] | Mergers and acquisitions [Member] |
Estimated Fair Value Percentage Segment Reporting Information | 10.00%
Bulk [Member] |
Estimated Fair Value Percentage Segment Reporting Information | 100.00%
Bulk [Member] | Discounted cash flow [Member] |
Estimated Fair Value Percentage Segment Reporting Information | 80.00%
Bulk [Member] | Guideline public company [Member] |
Estimated Fair Value Percentage Segment Reporting Information | 10.00%
Bulk [Member] | Mergers and acquisitions [Member] |
Estimated Fair Value Percentage Segment Reporting Information | 10.00%
Manufacturing Units [Member] |
Estimated Fair Value Percentage Segment Reporting Information | 100.00%
Manufacturing Units [Member] | Discounted cash flow [Member] |
Estimated Fair Value Percentage Segment Reporting Information | 80.00%
Manufacturing Units [Member] | Guideline public company [Member] |
Estimated Fair Value Percentage Segment Reporting Information | 10.00%
Manufacturing Units [Member] | Mergers and acquisitions [Member] |
Estimated Fair Value Percentage Segment Reporting Information | 10.00%

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

X
- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=cwco_RetailMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | cwco_FairValueDeterminingMethodAxis=cwco_DiscountedCashFlowMethodMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | cwco_FairValueDeterminingMethodAxis=cwco_GuidelinePublicCompanyMethodMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | cwco_FairValueDeterminingMethodAxis=cwco_MergersAndAcquisitionsMethodMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=cwco_BulkMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=cwco_ManufacturingUnitsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |