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Summary of Changes in Carrying Amount of Notes Receivable From Employees (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Receivables [Abstract]    
Notes receivable from employees - beginning $ 149,357 $ 141,391
Notes granted 26,827 52,698
Repayments (4,622) (8,180)
Amortization Expense (25,977) (32,070)
CTA and other (2,588) (4,482)
Notes receivable from employees - ending 142,997 149,357
Less current portion (36,115) (27,208)
Notes receivable, net of current portion $ 106,882 $ 122,149