Property and Equipment (Detail) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Property Plant And Equipment [Abstract]
Leasehold improvements	$ 69,278	$ 83,875
Construction in progress	2,349	2,147
Furniture and equipment	35,780	38,015
Computer equipment and software	94,637	111,191
Property, Plant and Equipment, Gross, Total	202,044	235,228
Accumulated depreciation and amortization	(140,188)	(160,468)
Property and equipment, net	$ 61,856	$ 74,760