Real Estate - Additional Information (Detail)	12 Months Ended				108 Months Ended
	Dec. 31, 2015 USD ($) Property		Dec. 31, 2014 USD ($) Property	Dec. 31, 2013 USD ($)	Dec. 31, 2015 USD ($) Property		Sep. 30, 2014 USD ($)
Real Estate Properties [Line Items]
Costs relate to water, sewer and other infrastructure assets					$ 54,376,000
Recovery of direct costs	$ (15,176,000)		$ (66,047,000)	$ (9,945,000)
GAIN ON SALE OF ASSETS	879,000		38,038,000	5,161,000
Investment in resort development	586,715,000		575,756,000		586,715,000
General Contractor Costs	1,543,000		5,111,000	554,000
Non-cash asset impairment charges	108,184,000		15,934,000	1,790,000
Payments to Acquire and Develop Real Estate	107,988,000		114,694,000	106,609,000
Cibolo Canyons Project [Member]
Real Estate Properties [Line Items]
Recovery of direct costs					34,703,000
Payments Received From Special Improvement District	425,000
GAIN ON SALE OF ASSETS	1,160,000		6,577,000
Investment in resort development							$ 24,067,000
Cibolo Canyons Project [Member] | San Antonio Texas [Member]
Real Estate Properties [Line Items]
Cost of asset in developed and under development projects	$ 22,302,000		31,913,000		$ 22,302,000
Multi Family Property [Member] | Austin, Texas [Member]
Real Estate Properties [Line Items]
Carrying value			$ 53,917,000
Number Of Units Of Multifamily Project | Property	257		257		257
Business Combination, Step Acquisition, Equity Interest in Acquiree, Percentage			25.00%
Payments to Acquire Businesses and Interest in Affiliates			$ 21,500,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net			55,275,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities, Long-term Debt			23,936,000
Business Combination, Step Acquisition, Equity Interest in Acquiree, Fair Value			2,229,000
Business Combination, Step Acquisition, Equity Interest in Acquiree, Fair Value			9,839,000
Business Combination, Step Acquisition, Equity Interest in Acquiree, Remeasurement Gain			7,610,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Prepaid Expense and Other Assets			992,000
Identified intangibles, net			865,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Working Capital			979,000
Consolidated Properties [Member]
Real Estate Properties [Line Items]
Recovery of direct costs	$ 14,751,000
Utility and Improvement District [Member]
Real Estate Properties [Line Items]
Cost of asset in developed and under development projects	67,554,000		65,212,000		$ 67,554,000
Income Producing Properties [Member] | Land, Buildings and Improvements [Member]
Real Estate Properties [Line Items]
Depreciation expense, related to commercial and income producing properties	6,810,000		3,319,000	$ 2,507,000
Real Estate [Member]
Real Estate Properties [Line Items]
Non-cash asset impairment charges	1,044,000		399,000
Bonds [Member] | Cibolo Canyons Project [Member]
Real Estate Properties [Line Items]
Payments Received From Special Improvement District	46,500,000		50,550,000
Debt Instrument, Face Amount	48,900,000				48,900,000
Letters of Credit Outstanding, Amount	6,846,000				6,846,000
Surety Bond for Bond Trustee	7,850,000				7,850,000
Midtown [Member]
Real Estate Properties [Line Items]
Carrying value	$ 0	[1]	$ 33,293,000		$ 0	[1]
Number Of Units Of Multifamily Project | Property	354				354
Real Estate Property Sale Price	$ 42,880,000
Segment Earnings From Sale of Multifamily Property	9,265,000
Proceeds from sale of multifamily property	18,473,000
Repayments of Debt	$ 24,166,000

[1] Sold in 2015.