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Receivables - Receivables (Detail) - USD ($) $ in Thousands | Dec. 31, 2016 | Dec. 31, 2015
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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%

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