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Real Estate - Additional Information (Detail) | 12 Months Ended | 120 Months Ended
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Dec. 31, 2016 USD ($) a property room transaction community_development_project multifamily_site | Dec. 31, 2015 USD ($) property | Dec. 31, 2014 USD ($) | Dec. 31, 2016 USD ($) a property room
Real Estate Properties [Line Items] |  |  |  |
Non-cash impairment charges | $ 60,939,000 | $ 108,184,000 | $ 15,934,000 |
Payment of debt | 315,229,000 | 58,220,000 | 225,481,000 |
Gain of sale of assets | 166,747,000 | 1,585,000 | 29,512,000 |
General contractor costs | 392,000 | 1,543,000 | 5,111,000 |
Recovery of direct costs | (27,107,000) | (15,176,000) | (66,047,000) |
Income Producing Properties | Land, Buildings and Improvements |  |  |  |
Real Estate Properties [Line Items] |  |  |  |
Depreciation expense, related to commercial and income producing properties | 816,000 | 6,810,000 | 3,319,000 |
Utility and Improvement District |  |  |  |
Real Estate Properties [Line Items] |  |  |  |
Cost of asset in developed and under development projects | 45,157,000 | 67,554,000 |  | $ 45,157,000
Cibolo Canyons Project | San Antonio, Texas |  |  |  |
Real Estate Properties [Line Items] |  |  |  |
Gain of sale of assets | 1,219,000 | 1,160,000 | 6,577,000 |
Cost of asset in developed and under development projects | 14,749,000 | 22,302,000 |  | 14,749,000
Recovery of direct costs |  |  |  | 45,132,000
Costs relate to water, sewer and other infrastructure assets |  |  |  | 54,376,000
Consolidated Properties |  |  |  |
Real Estate Properties [Line Items] |  |  |  |
Recovery of direct costs | 26,606,000 |  |  |
Bonds | Cibolo Canyons Project | San Antonio, Texas |  |  |  |
Real Estate Properties [Line Items] |  |  |  |
Payments received from special improvement district | 501,000 | 425,000 | 50,550,000 |
Debt instrument, face amount |  |  | 48,900,000 |
Letters of credit outstanding, amount |  |  | $ 6,846,000 |
Surety bond for bond trustee | $ 6,631,000 |  |  | $ 6,631,000
Radisson Hotel & Suites, Austin | Austin, Texas |  |  |  |
Real Estate Properties [Line Items] |  |  |  |
Number of hotel rooms | room | 413 |  |  | 413
Sales price | $ 130,000,000 |  |  | $ 130,000,000
Net proceeds | 128,764,000 |  |  |
Payment of debt | 15,400,000 |  |  |
Gain of sale of assets | 95,336,000 |  |  |
Eleven | Multi Family Property | Austin, Texas |  |  |  |
Real Estate Properties [Line Items] |  |  |  |
Sales price | 60,150,000 |  |  | $ 60,150,000
Net proceeds | 59,719,000 |  |  |
Payment of debt | 23,936,000 |  |  |
Gain of sale of assets | $ 9,116,000 |  |  |
Number of units of multifamily project | property | 257 |  |  | 257
Dillon | Charlotte, North Carolina |  |  |  |
Real Estate Properties [Line Items] |  |  |  |
Sales price | $ 25,979,000 |  |  | $ 25,979,000
Net proceeds | 25,428,000 |  |  |
Gain of sale of assets | $ 1,223,000 |  |  |
Number of units of multifamily project | property | 379 |  |  | 379
Music Row | Nashville, Tennessee |  |  |  |
Real Estate Properties [Line Items] |  |  |  |
Sales price | $ 15,025,000 |  |  | $ 15,025,000
Net proceeds | 14,703,000 |  |  |
Gain of sale of assets | $ 3,968,000 |  |  |
Number of units of multifamily project | property | 230 |  |  | 230
Downtown Edge | Austin, Texas |  |  |  |
Real Estate Properties [Line Items] |  |  |  |
Sales price | $ 5,000,000 |  |  | $ 5,000,000
Net proceeds | 4,975,000 |  |  |
Gain of sale of assets | (3,870,000) |  |  |
Midtown |  |  |  |
Real Estate Properties [Line Items] |  |  |  |
Net proceeds |  | $ 42,639,000 |  |
Number of units of multifamily project | property |  | 354 |  |
Real estate property sale price |  | $ 42,880,000 |  |
Segment earnings from sale of multifamily property |  | 9,265,000 |  |
Repayments of debt |  | $ 24,166,000 |  |
Real Estate Impairment Charges |  |  |  |
Real Estate Properties [Line Items] |  |  |  |
Non-cash impairment charges | $ 56,453,000 |  |  |
Community Development Project |  |  |  |
Real Estate Properties [Line Items] |  |  |  |
Number of properties impaired | community_development_project | 6 |  |  |
Multifamily Site |  |  |  |
Real Estate Properties [Line Items] |  |  |  |
Number of properties impaired | multifamily_site | 2 |  |  |
Disposal Group, Disposed of by Sale, Not Discontinued Operations | Georgia and Alabama |  |  |  |
Real Estate Properties [Line Items] |  |  |  |
Sales price | $ 104,172,000 |  |  | $ 104,172,000
Net proceeds | 103,238,000 |  |  |
Gain of sale of assets | $ 48,891,000 |  |  |
Area of land (in acres) | a | 58,300 |  |  | 58,300
Number of transactions | transaction | 3 |  |  |
Disposal Group, Disposed of by Sale, Not Discontinued Operations | Community Development Project |  |  |  |
Real Estate Properties [Line Items] |  |  |  |
Number of properties impaired | community_development_project | 4 |  |  |
Disposal Group, Disposed of by Sale, Not Discontinued Operations | Multifamily Site |  |  |  |
Real Estate Properties [Line Items] |  |  |  |
Number of properties impaired | multifamily_site | 1 |  |  |

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