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Segment and Geographic Information - Segment Reporting Information (Detail) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Brokerage revenues:    
Rates $ 160,772 $ 135,752
Credit 82,050 81,870
Foreign exchange 99,050 80,026
Energy and commodities 60,149 53,145
Equities, insurance, and other asset classes 97,754 75,706
Leasing and other services 159,378 127,574
Real estate capital markets 101,364 77,390
Gains from mortgage banking activities/originations, net 38,914 45,261
Real estate management and other services 96,878 50,630
Servicing fees 28,926 24,832
Fees from related parties 6,590 6,938
Data, software and post-trade 15,099 13,087
Other revenues 974 976
Total non-interest revenues 947,898 773,187
Interest income 8,748 10,006
Total revenues 956,646 783,193
Interest expense 27,138 18,763
Non-interest expenses 836,057 712,450
Total expenses 863,195 731,213
Other income (losses), net:    
Gain (loss) on divestiture and sale of investments   557
Gains (losses) on equity investments 5,801 237
Other income (losses) 33,942 5,020
Total other income (losses), net 39,743 5,814
Income (loss) from operations before income taxes 133,194 57,794
Corporate Items [Member]    
Brokerage revenues:    
Fees from related parties 6,299 6,565
Other revenues 13 30
Total non-interest revenues 6,312 6,595
Interest income 1,842 1,700
Total revenues 8,154 8,295
Interest expense 23,446 16,889
Non-interest expenses 80,809 79,252
Total expenses 104,255 96,141
Other income (losses), net:    
Gain (loss) on divestiture and sale of investments   557
Gains (losses) on equity investments 2,625 237
Other income (losses) 20,574 372
Total other income (losses), net 23,199 1,166
Income (loss) from operations before income taxes (72,902) (86,680)
Financial Services [Member] | Operating Segments [Member]    
Brokerage revenues:    
Rates 160,772 135,752
Credit 82,050 81,870
Foreign exchange 99,050 80,026
Energy and commodities 60,149 53,145
Equities, insurance, and other asset classes 97,754 75,706
Data, software and post-trade 15,099 13,087
Other revenues 913 942
Total non-interest revenues 515,787 440,528
Interest income 834 650
Total revenues 516,621 441,178
Non-interest expenses 403,821 353,906
Total expenses 403,821 353,906
Other income (losses), net:    
Other income (losses) 10,935 4,648
Total other income (losses), net 10,935 4,648
Income (loss) from operations before income taxes 123,735 91,920
Real Estate Services [Member] | Operating Segments [Member]    
Brokerage revenues:    
Leasing and other services 159,378 127,574
Real estate capital markets 101,364 77,390
Gains from mortgage banking activities/originations, net 38,914 45,261
Real estate management and other services 96,878 50,630
Servicing fees 28,926 24,832
Fees from related parties 291 373
Other revenues 48 4
Total non-interest revenues 425,799 326,064
Interest income 6,072 7,656
Total revenues 431,871 333,720
Interest expense 3,692 1,874
Non-interest expenses 351,427 279,292
Total expenses 355,119 281,166
Other income (losses), net:    
Gains (losses) on equity investments 3,176  
Other income (losses) 2,433  
Total other income (losses), net 5,609  
Income (loss) from operations before income taxes $ 82,361 $ 52,554