Cost Saving Initiatives - Schedule of Expenses and Cumulative Expenses Associated With Implementation of Cost Savings Initiatives (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended			15 Months Ended			12 Months Ended									15 Months Ended
	Dec. 31, 2013	Dec. 31, 2013 Compensation and Benefits [Member]	Dec. 31, 2013 Other [Member]	Dec. 31, 2013 Cumulative [Member]	Dec. 31, 2013 Cumulative [Member] Compensation and Benefits [Member]	Dec. 31, 2013 Cumulative [Member] Other [Member]	Dec. 31, 2013 Operating Segments [Member] Financial Advisory [Member]	Dec. 31, 2013 Operating Segments [Member] Financial Advisory [Member] Compensation and Benefits [Member]	Dec. 31, 2013 Operating Segments [Member] Financial Advisory [Member] Other [Member]	Dec. 31, 2013 Operating Segments [Member] Asset Management [Member]	Dec. 31, 2013 Operating Segments [Member] Asset Management [Member] Compensation and Benefits [Member]	Dec. 31, 2013 Operating Segments [Member] Asset Management [Member] Other [Member]	Dec. 31, 2013 Operating Segments [Member] Corporate [Member]	Dec. 31, 2013 Operating Segments [Member] Corporate [Member] Compensation and Benefits [Member]	Dec. 31, 2013 Operating Segments [Member] Corporate [Member] Other [Member]	Dec. 31, 2013 Operating Segments [Member] Cumulative [Member] Financial Advisory [Member]	Dec. 31, 2013 Operating Segments [Member] Cumulative [Member] Financial Advisory [Member] Compensation and Benefits [Member]	Dec. 31, 2013 Operating Segments [Member] Cumulative [Member] Financial Advisory [Member] Other [Member]	Dec. 31, 2013 Operating Segments [Member] Cumulative [Member] Asset Management [Member]	Dec. 31, 2013 Operating Segments [Member] Cumulative [Member] Asset Management [Member] Compensation and Benefits [Member]	Dec. 31, 2013 Operating Segments [Member] Cumulative [Member] Asset Management [Member] Other [Member]	Dec. 31, 2013 Operating Segments [Member] Cumulative [Member] Corporate [Member]	Dec. 31, 2013 Operating Segments [Member] Cumulative [Member] Corporate [Member] Compensation and Benefits [Member]	Dec. 31, 2013 Operating Segments [Member] Cumulative [Member] Corporate [Member] Other [Member]
Restructuring and Related Cost [Abstract]
Cost Saving Initiatives	$ 64,703	$ 51,399	$ 13,304	$ 167,279	$ 151,386	$ 15,893	$ 47,779	$ 45,746	$ 2,033	$ 235	$ 236	$ (1)	$ 16,689	$ 5,417	$ 11,272	$ 125,311	$ 121,879	$ 3,432	$ 13,024	$ 12,292	$ 732	$ 28,944	$ 17,215	$ 11,729