Carrying Value of multifamily project to secure Non-recourse loan.

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Carrying value of property to secure borrowing.

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Line Of Credit Facility Letters Of Credit Sublimit

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MinimumNetWorthPercentageRequiredForCompliance

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Number of guest room.

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Number of units of multifamily project.

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Percentage Of Spread On Federal Funds Effective Rate

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Percentage Of Variable Spread On Base Rate

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Amount of noncash expense included in interest expense to issue debt and obtain financing associated with the related debt instruments. Alternate captions include noncash interest expense.

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Percentage points added to the reference rate to compute the variable rate on the debt instrument.

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For an unclassified balance sheet, the carrying amount (net of accumulated amortization) as of the balance sheet date of capitalized costs associated with the issuance of debt instruments (for example, legal, accounting, underwriting, printing, and registration costs) that will be charged against earnings over the life of the debt instruments to which such costs pertain.

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The expense recorded to reduce the value of oil and gas assets consisting of proved properties and unproved properties as the estimate of future successful production from these properties is reduced.

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The total amount of the contingent obligation under letters of credit outstanding as of the reporting date.

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Date the credit facility terminates, in CCYY-MM-DD format.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding).

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Carrying amount of long-term debt, net of unamortized discount or premium, including current and noncurrent amounts. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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Debt - Additional Information (Detail)	3 Months Ended	9 Months Ended
Debt - Additional Information (Detail)	Sep. 30, 2015 USD ($) Property Room	Sep. 30, 2015 USD ($) Property Room	Sep. 30, 2014 USD ($)	Dec. 31, 2014 USD ($)
Line of Credit Facility [Line Items]
Minimum Net Worth Required for Compliance	80.00%	80.00%
Impairment of Oil and Gas Properties	$ 81,240,000
Debt	435,295,000	$ 435,295,000		$ 432,744,000
Deferred Finance Costs, Net	12,407,000	12,407,000		15,168,000
Amortization of deferred financing fees		2,992,000	$ 3,089,000
Revolving Credit Facility [Member]
Line of Credit Facility [Line Items]
Maximum borrowing capacity under term Loan facility	300,000,000	$ 300,000,000
Maturity period of revolving line of credit		May 15, 2017
Sublimit for letters of credit outstanding	16,184,000	$ 16,184,000
Net unused borrowing capacity	$ 283,816,000	$ 283,816,000
Percentage of spread on federal funds effective rate		0.50%
Austin, Texas [Member]
Line of Credit Facility [Line Items]
Guest room hotel \| Room	413	413
Carrying value of multifamily project to secure non recourse loan	$ 34,297,000	$ 34,297,000
Austin, Texas [Member] \| Multi Family Property [Member]
Line of Credit Facility [Line Items]
Number Of Units Of Multifamily Project \| Property	257	257
Dallas, Texas [Member] \| Multi Family Property [Member]
Line of Credit Facility [Line Items]
Number Of Units Of Multifamily Project \| Property	354	354
Secured Debt [Member]
Line of Credit Facility [Line Items]
Debt	$ 15,400,000	$ 15,400,000		15,400,000
Secured Debt [Member] \| Austin, Texas [Member]
Line of Credit Facility [Line Items]
Debt	15,400,000	15,400,000
Other indebtedness [Member]
Line of Credit Facility [Line Items]
Debt	53,324,000	53,324,000		$ 46,996,000
Other indebtedness [Member] \| Multi Family Property [Member]
Line of Credit Facility [Line Items]
Carrying value of property to secure borrowing	85,147,000	85,147,000
Letter of Credit [Member] \| Revolving Credit Facility [Member]
Line of Credit Facility [Line Items]
Line Of Credit Facility Letters Of Credit Sublimit	100,000,000	$ 100,000,000
LIBOR [Member] \| Revolving Credit Facility [Member]
Line of Credit Facility [Line Items]
Debt Instrument, Basis Spread on Variable Rate		4.00%
Base Rate [Member] \| Revolving Credit Facility [Member]
Line of Credit Facility [Line Items]
Percentage Of Variable Spread On Base Rate		3.00%
30 day LIBOR rate [Domain] \| Revolving Credit Facility [Member]
Line of Credit Facility [Line Items]
Debt Instrument, Basis Spread on Variable Rate		1.00%
Construction Loans [Member] \| Other indebtedness [Member]
Line of Credit Facility [Line Items]
Debt	$ 48,103,000	$ 48,103,000