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Receivables - Receivables (Detail) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total $ 4,586 $ 6,333
Allowance for bad debts (26) (26)
Receivables, net 4,560 6,307
Receivables and accrued interest    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total 1,416 2,557
Notes receivable    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total $ 3,170 $ 3,776
Average interest rates 5.40% 5.40%