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Revenues from Contracts with Customers - Summary of Revenues from Contracts with Customers and Other Sources of Revenues (Detail) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Revenue From Contracts With Customers [Line Items]        
Revenue from contracts with customers $ 787,082   $ 1,574,248  
Principal transactions 84,988 $ 80,360 176,906 $ 166,103
Gains from mortgage banking activities/originations, net 41,878 73,547 80,792 118,808
Servicing fees 32,333 26,840 61,259 51,672
Interest income 12,366 19,177 21,114 29,183
Other revenues 1,429 876 2,403 1,852
Total revenues 960,076 848,901 1,916,722 1,632,094
Commissions [Member]        
Revenue From Contracts With Customers [Line Items]        
Revenue from contracts with customers 658,320   1,326,919  
Real Estate Management And Other Services [Member]        
Revenue From Contracts With Customers [Line Items]        
Revenue from contracts with customers 107,121 51,589 203,999 102,219
Data, Software And Post-Trade [Member]        
Revenue From Contracts With Customers [Line Items]        
Revenue from contracts with customers 15,370 13,322 30,469 26,409
Fees From Related Parties [Member]        
Revenue From Contracts With Customers [Line Items]        
Revenue from contracts with customers $ 6,271 $ 6,018 $ 12,861 $ 12,956