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Debt (Details) - USD ($)
1 Months Ended 3 Months Ended 9 Months Ended
Jan. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Nov. 02, 2020
Dec. 31, 2019
Debt Instrument [Line Items]                
Debt   $ 368,601,000     $ 368,601,000     $ 365,749,000
Unamortized debt issuance costs   2,500,000     2,500,000     3,500,000
Interest costs incurred   4,700,000   $ 5,200,000 14,800,000 $ 14,900,000    
Interest costs capitalized   1,100,000   $ 2,000,000.0 3,600,000 $ 6,200,000    
Minimum [Member]                
Debt Instrument [Line Items]                
Debt covenant, total stockholders' equity   $ 110,000,000.0     110,000,000.0      
Minimum [Member] | Subsequent event                
Debt Instrument [Line Items]                
Debt Covenant, net asset value             $ 125,000,000  
London Interbank Offered Rate (LIBOR) [Member]                
Debt Instrument [Line Items]                
Basis spread on variable rate   1.00% 0.00%          
Block 21 loan                
Debt Instrument [Line Items]                
Debt   $ 139,578,000     139,578,000     141,184,000
The Santal loan                
Debt Instrument [Line Items]                
Debt   74,252,000     74,252,000     73,972,000
Comerica Bank credit facility                
Debt Instrument [Line Items]                
Debt   35,307,000     35,307,000     42,482,000
Comerica Bank credit facility | Line of credit                
Debt Instrument [Line Items]                
Letters of credit committed   150,000     150,000      
Comerica Bank credit facility | Line of credit | Revolving Credit Facility                
Debt Instrument [Line Items]                
Credit facility, available borrowing capacity   24,500,000     24,500,000      
Credit facility, maximum borrowing capacity   60,000,000.0     60,000,000.0      
Amarra Villas credit facility                
Debt Instrument [Line Items]                
Debt   702,000     702,000     5,520,000
New Caney land loan                
Debt Instrument [Line Items]                
Debt   4,939,000     4,939,000     4,908,000
Debt Instrument, Covenant, Principal Payment for Loan Extension   500,000     500,000      
Lantana Place                
Debt Instrument [Line Items]                
Debt   24,099,000     24,099,000     23,268,000
Jones Crossing                
Debt Instrument [Line Items]                
Debt   22,301,000     22,301,000     21,354,000
The Saint Mary Construction Loan [Member]                
Debt Instrument [Line Items]                
Debt   25,281,000     25,281,000     21,857,000
Kingwood Place                
Debt Instrument [Line Items]                
Debt   30,996,000     30,996,000     23,991,000
Kingwood Place | Notes Payable to Banks [Member] | Stratus Kingwood, L.P. [Member]                
Debt Instrument [Line Items]                
Debt Instrument, Increase (Decrease), Net $ 2,500,000              
Debt principal $ 35,400,000              
West Killeen Market                
Debt Instrument [Line Items]                
Debt   7,159,000     7,159,000     7,213,000
PPP loan                
Debt Instrument [Line Items]                
Debt   $ 3,987,000     $ 3,987,000     $ 0