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, 2020
Mar. 31, 2020
Jun. 30, 2019
Mar. 31, 2019
Jun. 30, 2020
Dec. 31, 2019
Accounts Notes And Loans Receivable [Line Items]            
Interest accrued and capitalized on notes receivable $ 2 $ 2 $ 3 $ 3    
Partners            
Accounts Notes And Loans Receivable [Line Items]            
Beginning balance   $ 645   $ 924 $ 645 $ 924
Repayment of notes         (300) (291)
Interest accrued and capitalized on notes receivable         4 12
Ending balance $ 349       $ 349 $ 645