Annual report pursuant to Section 13 and 15(d)

Notes Receivable from Partners - Schedule of Notes Receivable from Partners (Detail)

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Notes Receivable from Partners - Schedule of Notes Receivable from Partners (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Accounts Notes And Loans Receivable [Line Items]      
Interest accrued and capitalized on notes receivable $ 13 $ 25 $ 39
Partners      
Accounts Notes And Loans Receivable [Line Items]      
Beginning balance 924 1,918  
New notes receivable issued to partners   100  
Repayment of notes (291) (1,119)  
Interest accrued and capitalized on notes receivable 12 25  
Ending balance $ 645 $ 924 $ 1,918