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, 2019
Jun. 30, 2019
Mar. 31, 2019
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Sep. 30, 2019
Dec. 31, 2018
Accounts Notes And Loans Receivable [Line Items]                
Interest accrued and capitalized on notes receivable $ 3 $ 3 $ 3 $ 6 $ 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             9 25
Ending balance $ 642           $ 642 $ 924