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Acquisitions - Schedule of Allocation of Assets Acquired and Liabilities Assumed (Detail) - USD ($)
$ in Thousands
Feb. 26, 2015
Sep. 30, 2016
Dec. 31, 2015
Business Acquisition [Line Items]      
Goodwill   $ 830,246 $ 811,766
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 704,800    
Accrued commissions receivable, net 93,600    
Fixed assets, net 58,400    
Goodwill 450,000    
Other assets 194,200    
Assets held for sale 208,300    
Short-term borrowings (70,000)    
Accrued compensation (141,000)    
Payables to broker-dealers, clearing organizations, customers and related broker-dealers (648,600)    
Accounts payable, accrued and other liabilities (163,300)    
Notes payable and collateralized borrowings (255,300)    
Liabilities held for sale (175,500)    
Pre-existing noncontrolling interest (2,100)    
Total 779,500    
GFI Group Inc. [Member] | Trade Names [Member]      
Business Acquisition [Line Items]      
Indefinite-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 133,800    
GFI Group Inc. [Member] | Acquired Intangibles [Member]      
Business Acquisition [Line Items]      
Finite-lived intangible assets $ 6,700