Business Changes and Developments Goodwill Associated with Acquisitions (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013		Dec. 31, 2012
Goodwill [Roll Forward]
Goodwill, Beginning Balance	$ 188,684		$ 177,849
Acquisitions			6,500
Foreign Currency Translation and Other	590		4,335
Goodwill, Ending Balance	189,274	[1]	188,684
Investment Banking [Member]
Goodwill [Roll Forward]
Goodwill, Beginning Balance	86,352		81,937
Acquisitions			0
Foreign Currency Translation and Other	676		4,415
Goodwill, Ending Balance	87,028	[1]	86,352
Investment Management [Member]
Goodwill [Roll Forward]
Goodwill, Beginning Balance	102,332		95,912
Acquisitions			6,500
Foreign Currency Translation and Other	(86)		(80)
Goodwill, Ending Balance	$ 102,246	[1]	$ 102,332

[1] The balance includes the net effect of the goodwill related to the consolidation and disposition of Pan.