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, 2019
Mar. 31, 2019
Jun. 30, 2018
Mar. 31, 2018
Jun. 30, 2019
Dec. 31, 2018
Accounts Notes And Loans Receivable [Line Items]            
Interest accrued and capitalized on notes receivable $ 3 $ 3 $ 7 $ 8    
Partners            
Accounts Notes And Loans Receivable [Line Items]            
Beginning balance   $ 924   $ 1,918 $ 924 $ 1,918
New note receivable issued to partners           100
Repayment of notes         (291) (1,119)
Interest accrued and capitalized on notes receivable         6 25
Ending balance $ 639       $ 639 $ 924