Variable Interest Entity - Additional Information (Detail)		1 Months Ended			6 Months Ended
	Mar. 14, 2013 USD ($) Unit Townhomes shares	Jun. 30, 2015 USD ($) Unit	Dec. 31, 2013 USD ($) Townhomes shares	Mar. 31, 2013 USD ($)	Jun. 30, 2016 USD ($)	Jun. 30, 2015 USD ($) Unit	Dec. 31, 2015 USD ($)	Sep. 27, 2012 Unit	Aug. 23, 2012 Unit
Variable Interest Entity [Line Items]
Profit distributed					$ 2,717,000	$ 1,100,000
Amount paid for membership interest in private placement				$ 7,300,000
Total liabilities of VIEs					11,800,000		$ 13,000,000
Total assets of VIEs					18,600,000		$ 22,700,000
Maryland [Member]
Variable Interest Entity [Line Items]
Number of townhomes | Townhomes	36
Number of multi-family units | Unit	117
Washington, D.C. [Member]
Variable Interest Entity [Line Items]
Number of townhomes | Townhomes	73
Number of single family units | Unit	38
Virginia [Member]
Variable Interest Entity [Line Items]
Number of townhomes | Townhomes	110
Number of single family units | Unit	19
New Hampshire Avenue, LLC [Member]
Variable Interest Entity [Line Items]
Number of projects | Unit									111
Profit distributed					1,900,000	1,100,000
Comstock Eastgate, L.C. [Member]
Variable Interest Entity [Line Items]
Number of projects | Unit								66
Preferred distribution					0	0
Comstock Investors VII, L.C [Member] | Class A [Member]
Variable Interest Entity [Line Items]
Number of warrants issued | shares	17
Aggregate fair value of warrants for investors	$ 146,000
Comstock Investors VIII, L.C [Member]
Variable Interest Entity [Line Items]
Preferred distribution					800,000	$ 0
Cumulative, compounded, preferred return rate			20.00%
Percentage of cumulative cash on cash return			20.00%
Comstock Investors VIII, L.C [Member] | Maryland [Member]
Variable Interest Entity [Line Items]
Number of townhomes | Townhomes			45
Comstock Investors VIII, L.C [Member] | Virginia [Member]
Variable Interest Entity [Line Items]
Number of townhomes | Townhomes			42
Comstock Investors VIII, L.C [Member] | Class A [Member]
Variable Interest Entity [Line Items]
Number of warrants issued | shares			15
Aggregate fair value of warrants for investors			$ 131,000
Comstock Investors VIII, L.C [Member] | Subsidiaries [Member] | Private Placement [Member] | Class B [Member]
Variable Interest Entity [Line Items]
Initial aggregate principal amount up to capital raise			$ 4,000,000
Comstock Investors IX, L.C. [Member]
Variable Interest Entity [Line Items]
Preferred distribution					$ 0
Cumulative, compounded, preferred return rate		20.00%
Percentage of cumulative cash on cash return		20.00%
Comstock Investors IX, L.C. [Member] | Virginia [Member]
Variable Interest Entity [Line Items]
Number of single family units | Unit		35				35
Comstock Investors IX, L.C. [Member] | Subsidiaries [Member] | Private Placement [Member] | Class B [Member]
Variable Interest Entity [Line Items]
Initial aggregate principal amount up to capital raise		$ 2,500,000