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Acquisitions - Schedule of Preliminary Allocation of Assets Acquired and Liabilities Assumed (Detail) - USD ($)
$ in Thousands
Feb. 26, 2015
Sep. 30, 2015
Dec. 31, 2014
Business Acquisition [Line Items]      
Goodwill   $ 953,923 $ 392,570
GFI Group Inc. [Member]      
Business Acquisition [Line Items]      
Cash and cash equivalents $ 238,800    
Receivables from broker-dealers, clearing organizations, customers and related-broker dealers 696,700    
Accrued commissions receivable, net 93,600    
Fixed assets, net 58,000    
Other assets 189,200    
Assets held for sale 208,300    
Short-term borrowings (70,000)    
Accrued compensation (141,700)    
Payables to broker-dealers, clearing organizations, customers and related broker-dealers (641,500)    
Accounts payable, accrued and other liabilities (163,600)    
Notes payable and collateralized borrowings (255,300)    
Liabilities held for sale (175,500)    
Pre-existing noncontrolling interest (2,100)    
Finite-lived intangible assets 6,700    
Goodwill 436,100    
Total 779,500    
GFI Group Inc. [Member] | Trade Names [Member]      
Business Acquisition [Line Items]      
Infinite-lived intangible assets 92,100    
GFI Group Inc. [Member] | Noncompete Agreements [Member]      
Business Acquisition [Line Items]      
Finite-lived intangible assets 15,400    
GFI Group Inc. [Member] | Technology [Member]      
Business Acquisition [Line Items]      
Finite-lived intangible assets 39,200    
GFI Group Inc. [Member] | Customer Relationships [Member]      
Business Acquisition [Line Items]      
Finite-lived intangible assets $ 155,100