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Notes Receivable from Employees - Summary of Changes in Carrying Amount of Notes Receivable From Employees (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Loans and Leases Receivable, Related Parties [Roll Forward]        
Notes receivable from employees — beginning $ 113,699 $ 123,796    
Notes granted 28,879 32,937    
Repayments (13,179) (5,405)    
Amortization (26,294) (36,418)    
Cumulative translation adjustment and other 1,034 (1,211)    
Notes receivable from employees — ending $ 113,699 $ 123,796 $ 104,139 $ 113,699
Less: current portion     (35,106) (29,228)
Notes receivable from employees, net of current portion     $ 69,033 $ 84,471