Segment Information - Schedule of Segment Total Assets (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Segment Reporting Information [Line Items]
Total Assets	$ 2,898,203	$ 3,011,137
Financial Advisory [Member]
Segment Reporting Information [Line Items]
Total Assets	702,885	714,708
Asset Management [Member]
Segment Reporting Information [Line Items]
Total Assets	536,836	612,018
Corporate [Member]
Segment Reporting Information [Line Items]
Total Assets	$ 1,658,482	$ 1,684,411