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Warranty Reserve - Additional Information (Detail) | 3 Months Ended
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Mar. 31, 2018
Accounting Policies [Abstract] |
Period for which warranty claims expected to arise | 1 year
Period for which warranty claims expected to arise under statutorily period | 2 years

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- Definition Period for which warranty claims expected to arise. + References No definition available. + Details
Name: | chci_PeriodForWhichWarrantyClaimsExpectedToArise
Namespace Prefix: | chci_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Period for which warranty claims expected to arise under statutorily period. + References No definition available. + Details
Name: | chci_PeriodForWhichWarrantyClaimsExpectedToAriseUnderStatutorilyPeriod
Namespace Prefix: | chci_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_AccountingPoliciesAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration