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Leases - Additional Information (Detail)	Sep. 30, 2020 USD ($)
Leases [Abstract]
Operating lease borrowing rate (in percentage)	6.50%
Operating lease not yet commenced, liability	$ 0

X

- Definition

Lessee operating lease not yet commenced liability incurred.

+ References

No definition available.

+ Details

Name:	chci_LesseeOperatingLeaseNotYetCommencedLiabilityIncurred
Namespace Prefix:	chci_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- References

No definition available.

+ Details

Name:	us-gaap_LeasesAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Discount rate used by lessee to determine present value of operating lease payments.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 50
-Paragraph 3
-Subparagraph (c)(3)
-URI http://asc.fasb.org/extlink&oid=121609121&loc=SL77918673-209980

+ Details

Name:	us-gaap_LesseeOperatingLeaseDiscountRate
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant