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Revenue - Summary of Revenues from Contracts with Customers Disaggregated by Categories (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Disaggregation of Revenue [Line Items]
Total Revenue	$ 25,317	$ 16,447
Fixed-price [Member]
Disaggregation of Revenue [Line Items]
Total Revenue	4,137	2,084
Cost-plus [Member]
Disaggregation of Revenue [Line Items]
Total Revenue	14,546	12,040
Time and Material [Member]
Disaggregation of Revenue [Line Items]
Total Revenue	6,634	2,323
Related Party [Member]
Disaggregation of Revenue [Line Items]
Total Revenue	20,562	13,843
Commercial [Member]
Disaggregation of Revenue [Line Items]
Total Revenue	$ 4,755	$ 2,604

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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X

- Definition

Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 4
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130543-203045

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130545-203045

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- Details

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- Details

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- Details

Name:	us-gaap_ContractWithCustomerBasisOfPricingAxis=us-gaap_TimeAndMaterialsContractMember
Namespace Prefix:
Data Type:	na
Balance Type:
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X

- Details

Name:	srt_MajorCustomersAxis=chci_RelatedPartyMember
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- Details

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