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Notes and Contracts Receivable - Additional Information (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Contract receivables $ 19,700 $ 18,000    
Receivables, allowances 5,545 5,378 $ 6,470 $ 7,110
Chattel Loans        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Chattel notes receivable, net $ 15,900 16,500    
Loans receivable, stated interest yield per annum (in percentage) 7.70%      
Notes receivable, yield rate (in percentage) 22.00%      
Loans receivable, amortization term (in years) 10 years      
Allowance for loan and lease losses, real estate $ 300 300    
Contract Receivable        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans receivable, amortization term (in years) 4 years      
Contract receivable, weighted average rate (in percentage) 16.40%      
Receivables, allowances $ 500 700    
Rent Receivable        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Receivables, allowances $ 4,700 $ 4,400