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 6 Months Ended 12 Months Ended
Jun. 30, 2021
Mar. 31, 2021
Jun. 30, 2020
Mar. 31, 2020
Jun. 30, 2021
Dec. 31, 2020
Accounts Notes And Loans Receivable [Line Items]            
Interest accrued and capitalized on notes receivable $ 1 $ 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         3 8
Ending balance $ 603       $ 603 $ 353