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Segment Information - Segment Revenues and Earnings (Detail)
 3 Months Ended 6 Months Ended
Jun. 30, 2018
USD ($)
Jun. 30, 2017
USD ($)
a
Jun. 30, 2018
USD ($)
Jun. 30, 2017
USD ($)
a
Mar. 31, 2017
USD ($)
Segment Reporting Information [Line Items]          
Total revenues $ 23,565,000 $ 28,015,000 $ 46,164,000 $ 50,320,000  
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest 9,570,000 8,120,000 14,170,000 49,118,000  
General and Administrative Expense (3,518,000) (28,372,000) (7,263,000) (33,063,000)  
Gain on sale of assets     4,064,000 103,821,000  
Interest Expense (1,605,000) (2,166,000) (3,741,000) (4,401,000)  
Other corporate interest and other income 2,627,000 622,000 4,279,000 1,298,000  
Asset impairments     0 37,900,000  
Operating Segments [Member]          
Segment Reporting Information [Line Items]          
Total revenues 23,565,000 28,015,000 46,164,000 50,320,000  
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest 13,114,000 10,893,000 22,264,000 58,795,000  
Corporate, Non-Segment [Member]          
Segment Reporting Information [Line Items]          
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest (3,544,000) (2,773,000) (8,094,000) (9,677,000)  
General and Administrative Expense (3,389,000) (27,549,000) (7,042,000) (31,577,000)  
Share-based and long-term incentive compensation expense (177,000) (1,448,000) (313,000) (2,343,000)  
Gain on sale of assets 0 28,049,000 0 28,049,000  
Interest Expense (1,605,000) (2,166,000) (3,741,000) (4,401,000)  
Other corporate interest and other income 1,627,000 341,000 3,002,000 595,000  
Real Estate [Member] | Operating Segments [Member]          
Segment Reporting Information [Line Items]          
Total revenues 23,565,000 27,992,000 46,140,000 48,744,000  
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest 13,254,000 11,545,000 22,957,000 22,018,000  
Other [Member] | Operating Segments [Member]          
Segment Reporting Information [Line Items]          
Total revenues 0 23,000 24,000 1,576,000  
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest $ (140,000) (652,000) $ (693,000) 36,777,000  
the Mineral Companies | Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member]          
Segment Reporting Information [Line Items]          
Disposal group, consideration         $ 85,700,000
Gain on sale of assets       74,222,000  
Asset impairments       37,900,000  
Georgia and Texas [Member] | Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member]          
Segment Reporting Information [Line Items]          
Disposal group, consideration   $ 46,197,000   46,197,000  
Gain on sale of assets       $ 28,049,000  
Area of Land | a   19,000   19,000  
Proceeds from sale of real estate       $ 44,771,000  
General and Administrative Expense [Member] | Starwood Capital Group [Member]          
Segment Reporting Information [Line Items]          
Loss on Contract Termination       20,000,000  
D.R. Horton Merger Agreement [Member] | General and Administrative Expense [Member] | Starwood Capital Group [Member]          
Segment Reporting Information [Line Items]          
Professional Fees       $ 4,070,000