Revenue Recognition - Representation of Performance Obligations Relate to Nature, Amount, Timing and Uncertainty of Revenue and Cash Flows (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Financial Advisory Segment [Member]
Disaggregation Of Revenue [Line Items]
Net Revenue	$ 1,764,509	$ 1,420,501	$ 1,374,036
Asset Management Segment [Member]
Disaggregation Of Revenue [Line Items]
Net Revenue	1,424,985	1,167,466	1,237,390
Asset Management Segment [Member] | Management Fees and Other [Member]
Disaggregation Of Revenue [Line Items]
Net Revenue	1,304,582	1,109,439	1,216,115
Asset Management Segment [Member] | Incentive Fees [Member]
Disaggregation Of Revenue [Line Items]
Net Revenue	$ 120,403	$ 58,027	$ 21,275