Quarterly report pursuant to Section 13 or 15(d)

Receivables, Net - Summary of Receivables (Detail)

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Receivables, Net - Summary of Receivables (Detail) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Receivables [Abstract]    
Management and advisory fees receivable $ 2,741 $ 5,077
Unbilled receivables 3,747 2,897
Other receivables 2,082 2,083
Receivables 8,570 10,057
Allowance for doubtful receivables (621) (621)
Receivables, net $ 7,949 $ 9,436