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Receivables - Additional Information (Detail)
12 Months Ended
Dec. 31, 2016
a
Funds held by qualified intermediary  
Accounts, Notes, Loans and Financing Receivable [Line Items]  
Area of land (in acres) 6,915
Minimum  
Accounts, Notes, Loans and Financing Receivable [Line Items]  
Due period of notes receivable as secured by deed of trust 3 years
Maximum  
Accounts, Notes, Loans and Financing Receivable [Line Items]  
Due period of notes receivable as secured by deed of trust 5 years