Revenues from Contracts with Customers - Schedule of Revenues from Contracts with Customers and Our Other Sources of Revenues (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Disaggregation of Revenue
Revenues from contracts with customers	$ 515,331	$ 557,257	$ 1,438,586	$ 1,793,206
Revenues	616,283	664,646	1,722,926	2,098,245
Leasing and other commissions
Disaggregation of Revenue
Revenues from contracts with customers	203,268	219,903	600,185	631,681
Revenues	203,268	219,903	600,185	631,681
Investment sales
Disaggregation of Revenue
Revenues from contracts with customers	94,707	131,731	244,304	492,898
Revenues	94,707	131,731	244,304	492,898
Mortgage brokerage and debt placement
Disaggregation of Revenue
Revenues from contracts with customers	24,479	41,792	60,955	138,407
Management services
Disaggregation of Revenue
Revenues from contracts with customers	192,877	163,831	533,142	530,220
Fair value of expected net future cash flows from servicing recognized at commitment, net
Disaggregation of Revenue
Other sources of revenue	20,997	27,386	58,142	88,357
Loan originations related fees and sales premiums, net
Disaggregation of Revenue
Other sources of revenue	19,083	21,455	52,639	57,719
Servicing fees and other
Disaggregation of Revenue
Other sources of revenue	$ 60,872	$ 58,548	$ 173,559	$ 158,963