Furniture, Equipment and Leasehold Improvements (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Property, Plant and Equipment [Abstract]
Furniture and Office Equipment	$ 9,366	$ 8,891
Leasehold Improvements	32,719	30,884
Computer and Computer-related Equipment	11,739	9,882
Total	53,824	49,657
Less: Accumulated Depreciation and Amortization	(25,992)	(19,880)
Furniture, Equipment and Leasehold Improvements, Net	$ 27,832	$ 29,777