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Notes Receivable, Net - Additional Information (Detail) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Contract receivables $ 21.9 $ 19.7
Chattel Loans    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans receivable, amortization term (in years) 10 years  
Chattel notes receivable, net $ 13.4 15.9
Loans receivable, stated interest yield per annum (in percentage) 7.70%  
Notes receivable, yield rate (in percentage) 26.50%  
Allowance for loan and lease losses, real estate   $ 0.3
Contract Receivable    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Contract receivable, weighted average rate (in percentage) 16.60%  
Loans receivable, amortization term (in years) 3 years 6 months