XML 64 R52.htm IDEA: XBRL DOCUMENT
v3.19.1

Real Estate Inventories - Additional Information (Detail) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 USD ($) Project | Dec. 31, 2017 USD ($) Project
Real Estate Properties [Line Items] |  |
Number of projects classified as held for sale | Project | 0 | 0
Impairment charges | $ 2,232 | $ 526
Washington D.C. [Member] |  |
Real Estate Properties [Line Items] |  |
Impairment charges | $ 2,200 | $ 500

X
- Definition Number of project held for sale. + References No definition available. + Details
Name: | chci_NumberOfProjectHeldForSale
Namespace Prefix: | chci_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition The charge against earnings in the period to reduce the carrying amount of real property to fair value. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109226691&loc=d3e2921-110230 + Details
Name: | us-gaap_ImpairmentOfRealEstate
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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

X
- Details
Name: | srt_StatementGeographicalAxis=stpr_DC
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |