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Real Estate - Additional Information (Detail) (USD $)	12 Months Ended			9 Months Ended
Real Estate - Additional Information (Detail) (USD $)	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Sep. 30, 2014
Real Estate Properties [Line Items]
Costs relate to water, sewer and other infrastructure assets	$ 7,118,000	$ 17,923,000
Recovery of direct costs	(66,047,000)us-gaap_RecoveryOfDirectCosts	(9,945,000)us-gaap_RecoveryOfDirectCosts	(8,524,000)us-gaap_RecoveryOfDirectCosts
GAIN ON SALE OF ASSETS	38,038,000us-gaap_GainLossOnDispositionOfAssets1	5,161,000us-gaap_GainLossOnDispositionOfAssets1	25,983,000us-gaap_GainLossOnDispositionOfAssets1
Investment in resort development	575,756,000	519,464,000
Carrying value	192,678,000	99,476,000
General Contractor Costs	5,111,000us-gaap_GeneralContractorCosts	554,000us-gaap_GeneralContractorCosts
Non-cash asset impairment charges	15,934,000us-gaap_AssetImpairmentCharges	1,790,000us-gaap_AssetImpairmentCharges	0us-gaap_AssetImpairmentCharges
Payments to Acquire and Develop Real Estate	114,694,000	106,609,000	91,940,000
Cibolo Canyons Project [Member]
Real Estate Properties [Line Items]
Recovery of direct costs	9,883,000	600,000
Payments Received From Special Improvement District	50,550,000	4,400,000
GAIN ON SALE OF ASSETS	6,577,000
Investment in resort development				24,067,000
Area of Land	33
Cibolo Canyons Project [Member] \| San Antonio Texas [Member]
Real Estate Properties [Line Items]
Cost of asset in developed and under development projects	31,913,000	41,795,000
Multi Family Property [Member] \| Austin, Texas [Member]
Real Estate Properties [Line Items]
Carrying value	53,382,000			53,917,000
Number Of Units Of Multifamily Project	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			55,275,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities, Long-term Debt	23,936,000			23,936,000
Business Combination, Consideration Transferred, Including Equity Interest in Acquiree Held Prior to Combination	2,229,000
Business Combination, Step Acquisition, Equity Interest in Acquiree, Fair Value	2,229,000			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	649,000			865,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Working Capital				979,000
Multi Family Property [Member] \| Dallas, Texas [Member]
Real Estate Properties [Line Items]
Carrying value	33,062,000
Number Of Units Of Multifamily Project	354
Hotel Property [Member] \| Austin, Texas [Member]
Real Estate Properties [Line Items]
Carrying value	30,712,000
Commercial And Income Producing Properties Unit	413
Multi Family Development Properties [Member]
Real Estate Properties [Line Items]
Carrying value	44,145,000
Payments to Acquire and Develop Real Estate	26,110,000
Consolidated Properties [Member]
Real Estate Properties [Line Items]
Recovery of direct costs	15,497,000	5,545,000
Utility and Improvement District [Member]
Real Estate Properties [Line Items]
Cost of asset in developed and under development projects	65,212,000	62,183,000
Income Producing Properties [Member] \| Land, Buildings and Improvements [Member]
Real Estate Properties [Line Items]
Depreciation expense, related to commercial and income producing properties	3,319,000	2,507,000	3,640,000
Exchange of Productive Assets [Member]
Real Estate Properties [Line Items]
Land Subject to Ground Leases	10,300
Area of Land	5,400
Nonmonetary Transaction, Gain (Loss) Recognized on Transfer	10,476,000
Real Estate [Member]
Real Estate Properties [Line Items]
Non-cash asset impairment charges	399,000
Bonds [Member] \| Cibolo Canyons Project [Member]
Real Estate Properties [Line Items]
Payments Received From Special Improvement District	46,500,000
Debt Instrument, Face Amount	48,900,000
Letters of Credit Outstanding, Amount	6,846,000
Surety Bond for Bond Trustee	$ 9,010,000