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Notes Receivable - Components of Notes Receivable (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans receivable $ 41,988 $ 52,444 $ 72,218
Other 546 3,801  
Notes receivable, net $ 42,534 $ 56,245 $ 78,338
Loans Receivable [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Maturity Start Date 2017-09    
Maturity End Date 2023-06    
Loans Receivable [Member] | Minimum [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Interest Rate 5.70%    
Loans Receivable [Member] | Maximum [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Interest Rate 10.00%    
Other [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Maturity Start Date 2017-09    
Maturity End Date 2026-07    
Other [Member] | Minimum [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Interest Rate 5.60%    
Other [Member] | Maximum [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Interest Rate 12.00%