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Subsequent Events - Additional Information (Details)	Oct. 21, 2019 USD ($)
Subsequent Event | CDS [Member]
Subsequent Event [Line Items]
At-risk earnest money deposit in cumulative amount	$ 1,500,000

X

- Definition

At-risk earnest money deposit In cumulative amount.

+ References

No definition available.

+ Details

Name:	chci_AtRiskEarnestMoneyDepositInCumulativeAmount
Namespace Prefix:	chci_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event.

+ References

No definition available.

+ Details

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

X

- Details

Name:	us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=chci_ComstockDevelopmentServicesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: