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Summary of Significant Accounting Policies - Additional Information (Detail)
a in Thousands
12 Months Ended
Dec. 31, 2016
USD ($)
a
community_development_project
multifamily_site
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Feb. 17, 2017
USD ($)
Significant Accounting Policies [Line Items]        
Restricted cash and cash equivalents $ 275,000 $ 200,000    
Capital expenditures incurred but not yet paid 834,000 7,033,000    
Non-cash impairment charges 60,939,000 108,184,000 $ 15,934,000  
Capitalized exploratory well costs 0      
Non-Oil And Gas Properties        
Significant Accounting Policies [Line Items]        
Depreciation expense of property and equipment $ 889,000 1,067,000 903,000  
Minimum        
Significant Accounting Policies [Line Items]        
Reimbursement range on water, sewer and other infrastructure-related assets 70.00%      
Maximum        
Significant Accounting Policies [Line Items]        
Reimbursement range on water, sewer and other infrastructure-related assets 90.00%      
Capitalize reforestation costs 2 years      
Computer Software, Intangible Asset        
Significant Accounting Policies [Line Items]        
Carrying value of capitalized software $ 52,000 237,000    
Capitalized software amortization $ 155,000 996,000 1,067,000  
Computer Software, Intangible Asset | Minimum        
Significant Accounting Policies [Line Items]        
Useful life range 3 years      
Computer Software, Intangible Asset | Maximum        
Significant Accounting Policies [Line Items]        
Useful life range 5 years      
Georgia        
Significant Accounting Policies [Line Items]        
Timber owned directly or through ventures | a 19      
Depletion $ 63,000 $ 250,000 $ 371,000  
Real Estate Impairment Charges        
Significant Accounting Policies [Line Items]        
Non-cash impairment charges $ 56,453,000      
Community Development Project        
Significant Accounting Policies [Line Items]        
Number of properties impaired | community_development_project 6      
Multifamily Site        
Significant Accounting Policies [Line Items]        
Number of properties impaired | multifamily_site 2      
Water Resources Company | Texas        
Significant Accounting Policies [Line Items]        
Non-cash impairment charges $ 3,874,000      
Disposal Group, Disposed of by Sale, Not Discontinued Operations | Community Development Project        
Significant Accounting Policies [Line Items]        
Number of properties impaired | community_development_project 4      
Disposal Group, Disposed of by Sale, Not Discontinued Operations | Multifamily Site        
Significant Accounting Policies [Line Items]        
Number of properties impaired | multifamily_site 1      
Disposal Group, Disposed of by Sale, Not Discontinued Operations | The Mineral Companies | Subsequent Event        
Significant Accounting Policies [Line Items]        
Purchase price of properties sold       $ 85,600,000