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 12 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
Accounts Notes And Loans Receivable [Line Items]      
Interest accrued and capitalized on notes receivable $ 2 $ 2  
Partners      
Accounts Notes And Loans Receivable [Line Items]      
Beginning balance 353 $ 645 $ 645
New notes issued to partners 475    
Repayment of notes (228)   (300)
Interest accrued and capitalized on notes receivable 2   8
Ending balance $ 602   $ 353