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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

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