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Notes Payable - Additional Information (Detail) (USD $)
 3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended 12 Months Ended 12 Months Ended 6 Months Ended 0 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Facility
Jun. 30, 2013
Dec. 31, 2013
Jun. 30, 2014
Notes payable [Member]
Jun. 30, 2013
Notes payable [Member]
Jun. 30, 2014
Notes payable [Member]
Jun. 30, 2013
Notes payable [Member]
Jun. 30, 2014
Seller financed loans [Member]
Dec. 31, 2013
Acquisition and development loans [Member]
Dec. 31, 2013
Construction loans [Member]
Dec. 31, 2013
50 million revolving credit facility [Member]
Jun. 30, 2014
50 million revolving credit facility [Member]
Dec. 31, 2013
175 million revolving credit facility [Member]
Jun. 30, 2014
175 million revolving credit facility [Member]
Jun. 30, 2014
425 million revolving credit facility [Member]
Jun. 30, 2014
425 million revolving credit facility [Member]
Minimum [Member]
Jun. 30, 2014
425 million revolving credit facility [Member]
Maximum [Member]
Debt Instrument [Line Items]                                      
Unsecured revolving credit facility                                 $ 425,000,000    
Sublimit for letters of credit                                 75,000,000    
Line of credit facility, maturity date                                 Jul. 01, 2018    
Debt instrument variable interest rate                                   2.15% 2.85%
Capitalized other debt financing costs 4,447,000   4,447,000   704,000                       4,447,000    
Number of secured revolving credit facilities     2                                
Loan commitments                     43,200,000 22,400,000   50,000,000   175,000,000      
Outstanding balance 210,000,000   210,000,000                   9,100,000 0 81,500,000 0      
Interest rate on revolving credit facility     2.74%                   3.75%   2.92%        
Available secured revolving credit facility 126,000,000   126,000,000                   20,200,000   42,200,000        
Loan commitments outstanding 227,128,000   227,128,000   138,112,000         17,128,000 31,591,000 15,832,000              
Interest rate on seller financed loan                   7.00%                  
Remaining unpaid balance due date                   2016-05                  
Interest capitalized to real estate inventories 2,068,000 579,000 3,304,000 1,313,000   2,100,000 579,000 3,300,000 1,300,000                    
Amortization of deferred financing costs           636,000 0 717,000 0                    
Accrued interest payable $ 103,000 $ 160,000 $ 103,000 $ 160,000