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Revenues from Contracts with Customers - Schedule of Revenues from Contracts with Customers and Our Other Sources of Revenues (Detail) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Disaggregation of Revenue        
Revenues from contracts with customers: $ 548,516 $ 278,135 $ 963,919 $ 672,066
Revenues 629,871 383,718 1,133,851 867,647
Gains from mortgage banking activities/originations, net        
Disaggregation of Revenue        
Other sources of revenue 41,260 69,071 88,653 119,494
Servicing fees and other        
Disaggregation of Revenue        
Other sources of revenue 40,095 36,512 81,279 76,087
Leasing and other commissions        
Disaggregation of Revenue        
Revenues from contracts with customers: 184,346 120,079 331,779 260,517
Revenues 184,346 120,079 331,779 260,517
Capital markets commissions        
Disaggregation of Revenue        
Revenues from contracts with customers: 184,756 52,959 306,159 180,882
Management services        
Disaggregation of Revenue        
Revenues from contracts with customers: $ 179,414 $ 105,097 $ 325,981 $ 230,667