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Note Receivables - Summary of Outstanding Note Receivable Balance (Detail) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2018
Dec. 31, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total note receivable, net $ 28,121 $ 18,748
Notes Receivable [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Note receivable (face value) 30,000 22,000
Less: Original issue discount ("OID"), unamortized (2,788) (3,252)
Plus: PIK interest 909  
Total note receivable, net $ 28,121 18,748
Commitment remaining   $ 8,000