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Receivables - Receivables (Detail) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Receivables, gross $ 8,957 $ 19,051
Allowance for bad debts (26) (26)
Receivables, net 8,931 19,025
Funds held by qualified intermediary    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Receivables, gross 0 14,703
Other receivables and accrued interest    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Receivables, gross 1,505 2,218
Other loans secured by real estate    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Receivables, gross $ 7,452 $ 2,130
Average interest rates 5.86% 11.31%