Quarterly report pursuant to Section 13 or 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
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2021
Jun. 30, 2021
Mar. 31, 2021
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Sep. 30, 2021
Dec. 31, 2020
Accounts Notes And Loans Receivable [Line Items]                
Interest accrued and capitalized on notes receivable $ 1 $ 1 $ 2 $ 2 $ 2 $ 2    
Partners                
Accounts Notes And Loans Receivable [Line Items]                
Beginning balance     $ 353     $ 645 $ 353 $ 645
New notes issued to partners             475  
Repayment of notes             (228) (300)
Interest accrued and capitalized on notes receivable             4 8
Ending balance $ 604           $ 604 $ 353