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Fair Value Disclosures - Additional Information (Detail) (USD $)
 3 Months Ended 12 Months Ended
Mar. 31, 2013
Dec. 31, 2014
Dec. 31, 2013
Fair Value, Option, Quantitative Disclosures [Line Items]      
Impairment (reversal) charges $ 700,000us-gaap_ImpairmentOfRealEstate $ 2,695,000us-gaap_ImpairmentOfRealEstate $ 348,000us-gaap_ImpairmentOfRealEstate
Impairment reversal     700,000chci_ImpairmentOfRealEstateReversal
Momentum / Shady Grove Project [Member]      
Fair Value, Option, Quantitative Disclosures [Line Items]      
Impairment (reversal) charges   2,700,000us-gaap_ImpairmentOfRealEstate
/ us-gaap_CapitalizedCostsOfUnprovedPropertiesExcludedFromAmortizationByPropertyOrProjectAxis
= chci_MomentumShadyGroveProjectMember		  
Blvd Newell Project [Member]      
Fair Value, Option, Quantitative Disclosures [Line Items]      
Impairment (reversal) charges     $ 1,100,000us-gaap_ImpairmentOfRealEstate
/ us-gaap_CapitalizedCostsOfUnprovedPropertiesExcludedFromAmortizationByPropertyOrProjectAxis
= chci_BlvdNewellProjectMember