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Organization and Basis of Presentation - Additional Information (Detail) $ in Thousands				3 Months Ended		6 Months Ended
	Aug. 15, 2016 USD ($) Townhomes	Jul. 20, 2016	Sep. 25, 2015	Jun. 30, 2016 USD ($)	Jun. 30, 2015 USD ($)	Jun. 30, 2016 USD ($)	Jun. 30, 2015 USD ($)	Dec. 31, 2015 USD ($)
Organization And Basis Of Presentation [Line Items]
Reverse stock split, Conversion Ratio			0.143
Reverse stock split, description						On September 25, 2015, the Company effected a 1-for-7 reverse stock split of its issued and outstanding shares of Class A common stock and Class B common stock.
Credit facilities and project related loans, maturing during the remainder of 2016				$ 12,707		$ 12,707
Maturity date						Dec. 31, 2016
Stockholders' equity				46		$ 46		$ 5,441
Redemption of non-controlling interests						2,717
Operating loss				1,461	$ 274	2,749	$ 942
Nasdaq Stock Market LLC [Member]
Organization And Basis Of Presentation [Line Items]
Minimum stockholders' equity required for continued listing				2,500		$ 2,500
Subsequent Events [Member]
Organization And Basis Of Presentation [Line Items]
Minimum stockholders' equity required for continued listing	$ 2,500
Subsequent Events [Member] \| Totten Mews Project [Member] \| Washington, D.C. [Member]
Organization And Basis Of Presentation [Line Items]
Number of townhomes \| Townhomes	40
Subsequent Events [Member] \| 1333 Project [Member] \| Virginia [Member]
Organization And Basis Of Presentation [Line Items]
Number of townhomes \| Townhomes	18
Subsequent Events [Member] \| Comstock Investors X, L.C. [Member] \| Private Placement [Member]
Organization And Basis Of Presentation [Line Items]
Aggregate capital raise	$ 14,500
Construction Revolvers [Member] \| Yorkshire Credit Facility [Member]
Organization And Basis Of Presentation [Line Items]
Maturity date						Jul. 23, 2016
Credit facility outstanding				$ 200		$ 200
Construction Revolvers [Member] \| Subsequent Events [Member] \| Yorkshire Credit Facility [Member]
Organization And Basis Of Presentation [Line Items]
Maturity date		Oct. 23, 2016