Goodwill and Other Intangible Assets - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Goodwill And Intangible Assets [Line Items]
Goodwill	$ 345,453	$ 364,328	$ 356,657	$ 313,229
Goodwill impairment charges	0	0	0
Amortization expense of intangible assets	10,114	8,359	11,915
Financial Advisory Segment [Member]
Goodwill And Intangible Assets [Line Items]
Goodwill	280,912	299,787
Asset Management Segment [Member]
Goodwill And Intangible Assets [Line Items]
Goodwill	$ 64,541	$ 64,541