Debt instrument maturity extension fee percentage.

No definition available.

Name:	chci_DebtInstrumentMaturityExtensionFeePercentage
Namespace Prefix:	chci_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Debt instrument optional maturity extension term.

+ References

No definition available.

+ Details

Name:	chci_DebtInstrumentOptionalMaturityExtensionTerm
Namespace Prefix:	chci_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

+ References

+ Details

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

- Definition

Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format.

+ References

+ Details

Name:	us-gaap_DebtInstrumentMaturityDate
Namespace Prefix:	us-gaap_
Data Type:	xbrli:dateItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount of payable due to an entity that is affiliated with the reporting entity by means of direct or indirect ownership.

+ References

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-Name Accounting Standards Codification
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+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Number of new stock issued during the period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
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+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

- 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

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

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_StatementClassOfStockAxis=us-gaap_CommonClassAMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Subsequent Events - Additional Information (Detail) - USD ($) shares in Thousands, $ in Thousands	Apr. 16, 2018	Mar. 31, 2018	Dec. 31, 2017
Subsequent Event [Line Items]
Outstanding borrowings and accrued interest, net of discounts		$ 15,346	$ 14,893
Comstock Growth Fund [Member]
Subsequent Event [Line Items]
Outstanding borrowings and accrued interest, net of discounts		$ 11,700
Comstock Growth Fund [Member] \| Subsequent Events [Member]
Subsequent Event [Line Items]
Debt instrument, maturity date	Apr. 16, 2019
Debt instrument, optional maturity extension term	12 months
Debt instrument, maturity extension fee percentage	0.50%
Debt instrument, interest rate	3.89%
Comstock Growth Fund [Member] \| Subsequent Events [Member] \| Class A [Member]
Subsequent Event [Line Items]
Issuance of Class A Common Stock	300