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Notes Receivable from Employees - Additional information (Detail) $ in Millions	12 Months Ended
	Dec. 31, 2015 USD ($) Note	Dec. 31, 2014 USD ($) Note	Dec. 31, 2013 USD ($)
Receivables [Abstract]
Notes outstanding \| Note	285	311
Amortization of forgivable loan expense \| $	$ 26.0	$ 32.1	$ 35.1