Quarterly report pursuant to Section 13 or 15(d)

Notes Receivable from Financial Advisors (Detail)

v3.19.1
Notes Receivable from Financial Advisors (Detail) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2019
Dec. 31, 2018
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Percentage bearing variable interest rate 10.00%  
Allowance for doubtful accounts $ 1,657 $ 1,528
Minimum    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans amortized over repayment period 3 years  
Maximum    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans amortized over repayment period 5 years