Class of warrant or right number of warrants issued during period.

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- Definition

Class Of Warrant Or Right Value Of Warrants Issued During Period

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No definition available.

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- Definition

Number of town houses.

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No definition available.

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- Definition

Number Of Warrants Issued

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No definition available.

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- Definition

Percentage over members capital account for purchase price.

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No definition available.

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- Definition

Sale of stock consideration received on transaction in private placement.

+ References

No definition available.

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- Definition

Subscription from membership interest maximum capital amount in private placement.

+ References

No definition available.

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- Definition

Subscription From Membership Interest Maximum Capital Amount In Private Placement Additional

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No definition available.

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- Definition

Amount of paid and unpaid preferred stock dividends declared with the form of settlement in cash.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 405
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6957935&loc=d3e64057-112817

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-Publisher FASB
-Name Accounting Standards Codification
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-Section S99
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-Subparagraph (SX 210.3-04)
-URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770

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- Definition

Amount of expense (income) related to adjustment to fair value of warrant liability.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 480
-SubTopic 10
-Section 25
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- Definition

The number of units in a real estate property owned as of the balance sheet date.

+ References

No definition available.

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- Definition

The cash outflow associated with the purchase of or advances to an equity method investments, which are investments in joint ventures and entities in which the entity has an equity ownership interest normally of 20 to 50 percent and exercises significant influence.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 13
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3213-108585

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- Definition

Amount of cash outflow to a noncontrolling interest. Includes, but not limited to, reduction of noncontrolling interest ownership. Excludes dividends paid to the noncontrolling interest.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Topic 230
-SubTopic 10
-Section 45
-Paragraph 15
-URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3291-108585

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- Definition

The percentage rate used to calculate dividend payments on preferred stock.

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No definition available.

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- Definition

The carrying amount of the consolidated Variable Interest Entity's assets included in the reporting entity's statement of financial position.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 810
-SubTopic 10
-Section 50
-Paragraph 3
-Subparagraph (bb)
-URI http://asc.fasb.org/extlink&oid=77990344&loc=d3e5710-111685

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- Definition

The carrying amount of the consolidated Variable Interest Entity's liabilities included in the reporting entity's statement of financial position.

+ References

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- 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.

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No definition available.

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Consolidation of Variable Interest Entities - Additional Information (Detail)	1 Months Ended					12 Months Ended
	Oct. 31, 2017 USD ($) shares	Jan. 31, 2017 USD ($)	Aug. 31, 2016 USD ($) shares	Jun. 30, 2015 USD ($)	Dec. 31, 2013 USD ($) Townhomes shares	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)	Oct. 31, 2016 USD ($)	Aug. 23, 2012 Unit
Variable Interest Entity [Line Items]
Distribution to non-controlling interests						$ 6,432,000	$ 4,938,000
Warrants issued \| shares	50,000
Total liabilities of VIEs						15,900,000	18,500,000
Total assets of VIEs						30,600,000	38,100,000
New Hampshire Avenue, LLC [Member]
Variable Interest Entity [Line Items]
Number of projects \| Unit									111
Distribution to non-controlling interests						0	1,900,000
Comstock Investors VIII, L.C [Member]
Variable Interest Entity [Line Items]
Distribution to non-controlling interests							3,100,000
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] \| Class B [Member]
Variable Interest Entity [Line Items]
Distribution to non-controlling interests		$ 1,900,000
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]
Cumulative, compounded, preferred return rate				20.00%
Percentage of cumulative cash on cash return				20.00%
Preferred distribution							0
Payments to acquire remaining equity interest	$ 3,500,000
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
Comstock Investors X, L.C. [Member]
Variable Interest Entity [Line Items]
Distribution to non-controlling interests						$ 1,000,000	$ 0
Cumulative, compounded, preferred return rate			6.00%
Aggregate capital raise	19,500,000
Additional capital raised	5,000,000
Aggregate fair value	$ 258,000
Comstock Investors X, L.C. [Member] \| Class A [Member]
Variable Interest Entity [Line Items]
Number of warrants issued \| shares			150
Aggregate fair value of warrants for investors			$ 258,000
Comstock Investors X, L.C. [Member] \| Private Placement [Member]
Variable Interest Entity [Line Items]
Aggregate capital raise								$ 14,500,000
Comstock Investors X, L.C. [Member] \| Subsidiaries [Member] \| Private Placement [Member] \| Class B [Member]
Variable Interest Entity [Line Items]
Initial aggregate principal amount up to capital raise			$ 5,000,000
Comstock Development Services LC [Member] \| Private Placement [Member]
Variable Interest Entity [Line Items]
Aggregate capital raise								$ 9,500,000