Summary of Significant Accounting Policies - Schedule of Revenue by Segment (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Revenue from External Customer
Revenues	$ 616,283	$ 664,646	$ 1,722,926	$ 2,098,245
Management services, servicing fees and other
Revenue from External Customer
Revenues	253,749	222,379	706,701	689,183
Leasing and other commissions
Revenue from External Customer
Revenues	203,268	219,903	600,185	631,681
Investment sales
Revenue from External Customer
Revenues	94,707	131,731	244,304	492,898
Commercial mortgage origination, net
Revenue from External Customer
Revenues	$ 64,559	$ 90,633	$ 171,736	$ 284,483