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Notes Receivable Backed by Real Estate - Additional Information (Detail) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Dec. 31, 2015
Loans And Leases Receivable [Line Items]      
Notes backed by real estate $ 201,250 $ 9,866  
Notes receivable backed by real estate 33,800   $ 235,050
Third Parties [Member]      
Loans And Leases Receivable [Line Items]      
Notes receivable backed by real estate $ 33,800    
Minimum [Member]      
Loans And Leases Receivable [Line Items]      
Notes receivable maturity date 2016-12    
Minimum [Member] | Third Parties [Member]      
Loans And Leases Receivable [Line Items]      
Interest rate on Note receivable 5.50%    
Maximum [Member]      
Loans And Leases Receivable [Line Items]      
Notes receivable maturity date 2017-04    
Maximum [Member] | Third Parties [Member]      
Loans And Leases Receivable [Line Items]      
Interest rate on Note receivable 10.00%