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Warranty Reserve - Additional Information (Detail)	3 Months Ended
	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

X

- Definition

Period for which warranty claims expected to arise.

+ References

No definition available.

+ Details

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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