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Current Expected Credit Losses (CECL) - Additional Information (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
Jan. 01, 2020
Financing Receivable Allowance For Credit Losses [Line Items]        
Current expected credit losses reserve $ 2,800   $ 2,600 $ 1,900
Increase (decrease) in expected credit losses reserve 200 $ 800    
Accrued Commissions and Other Receivables, Net [Member]        
Financing Receivable Allowance For Credit Losses [Line Items]        
Current expected credit losses reserve 1,000   1,000 800
Increase (decrease) in expected credit losses reserve (22) 200    
Loans, Forgivable Loans and Other Receivables from Employees and Partners, Net [Member]        
Financing Receivable Allowance For Credit Losses [Line Items]        
Current expected credit losses reserve 1,800   $ 1,600 $ 1,100
Increase (decrease) in expected credit losses reserve $ 200 $ 600