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Fair Value Disclosures - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Fair Value, Option, Quantitative Disclosures [Line Items]
Impairment charges	$ 2,232	$ 526
Washington D.C. [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Impairment charges	$ 2,200	$ 500
Comstock Growth Fund One And Two [Member] | Series C- Non Convertible Preferred Stock [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Convertible preferred shares issued upon conversion	2,220,690
Preferred stock liquidation value per share	$ 5.00

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Number of shares issued for each share of convertible preferred stock that is converted.

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The charge against earnings in the period to reduce the carrying amount of real property to fair value.

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The per share liquidation preference (or restrictions) of nonredeemable preferred stock (or preferred stock redeemable solely at the option of the issuer) that has a preference in involuntary liquidation considerably in excess of the par or stated value of the shares. The liquidation preference is the difference between the preference in liquidation and the par or stated values of the share.

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