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Debt - Additional Information (Detail) (USD $)
 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Dec. 31, 2013
Line of Credit Facility [Line Items]      
Debt $ 429,295,000   $ 357,407,000
Deferred Finance Costs, Net 16,072,000   7,896,000
Amortization of deferred financing fees 3,089,000 2,282,000  
Revolving Credit Facility [Member]
      
Line of Credit Facility [Line Items]      
Maximum borrowing capacity under term Loan facility 300,000,000   200,000,000
Maturity period of revolving line of credit May 15, 2017    
Revolving Line Of Credit Facility Extension Option Term two one-year extension options    
Sublimit for letters of credit outstanding 10,118,000    
Debt Instrument, Fee Amount 3,068,000    
Net unused borrowing capacity 289,882,000    
Percentage of spread on federal funds effective rate 0.50%    
Austin, Texas [Member]
      
Line of Credit Facility [Line Items]      
Guest room hotel 413    
Carrying value of multifamily project to secure non recourse loan 29,002,000    
Austin, Texas [Member] | Multi Family Property [Member]
      
Line of Credit Facility [Line Items]      
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities, Long-term Debt 23,936,000    
Number Of Units Of Multifamily Project 257    
Senior Notes [Member]
      
Line of Credit Facility [Line Items]      
Interest Rate Percentage 8.50%    
Debt instrument, maturity date Jun. 01, 2022    
Payment of Financing and Stock Issuance Costs 8,053,000    
Debt 250,000,000   0
Convertible Debt [Member]
      
Line of Credit Facility [Line Items]      
Debt 102,368,000   99,890,000
Secured Debt [Member]
      
Line of Credit Facility [Line Items]      
Debt 15,400,000   15,400,000
Secured Debt [Member] | Austin, Texas [Member]
      
Line of Credit Facility [Line Items]      
Debt 15,400,000    
Other indebtedness [Member]
      
Line of Credit Facility [Line Items]      
Debt 42,335,000   16,498,000
Carrying value of property to secure borrowing 19,239,000    
Other indebtedness [Member] | Multi Family Property [Member]
      
Line of Credit Facility [Line Items]      
Carrying value of property to secure borrowing 82,715,000    
Amended Senior Secured Credit Facility [Domain]
      
Line of Credit Facility [Line Items]      
DebtCovenantMinimumInterestCoverageRatio 250.00%    
DebtCovenantLeverageRatio 50.00%    
Senior secured credit facility [Member]
      
Line of Credit Facility [Line Items]      
DebtCovenantMinimumInterestCoverageRatio 150.00%    
DebtCovenantLeverageRatio 40.00%    
Senior secured credit facility [Member] | Term loan facility [Member]
      
Line of Credit Facility [Line Items]      
Repayments of Debt 200,000,000    
Debt 0   200,000,000
Letter of Credit [Member] | Revolving Credit Facility [Member]
      
Line of Credit Facility [Line Items]      
Maximum borrowing capacity under term Loan facility 100,000,000    
Convertible Debt [Member]
      
Line of Credit Facility [Line Items]      
Interest Rate Percentage 3.75%    
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%    
Underwriters Discount [Domain] | Senior Notes [Member]
      
Line of Credit Facility [Line Items]      
Payment of Financing and Stock Issuance Costs 6,250,000    
Construction Loans [Member] | Other indebtedness [Member]
      
Line of Credit Facility [Line Items]      
Debt $ 38,033,000