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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, 2017
Dec. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Loans and Leases Receivable, Related Parties [Roll Forward]        
Notes receivable from employees — beginning $ 136,388 $ 142,997    
Notes granted 18,247 33,943    
Repayments (7,394) (12,985)    
Amortization expense (26,821) (25,566)    
Cumulative translation adjustment and other 3,376 (2,001)    
Notes receivable from employees — ending $ 136,388 $ 142,997 $ 123,796 $ 136,388
Less: current portion     (25,691) (31,864)
Notes receivable from employees, net of current portion     $ 98,105 $ 104,524