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Acquisition of KCG Holdings, Inc. - Intangible assets (Details) - USD ($)
Jul. 20, 2017
Mar. 31, 2018
Dec. 31, 2017
Amounts preliminarily allocated to intangible assets, the amortization period and goodwill      
Intangible assets   $ 104,387,000 $ 111,224,000
Goodwill   836,583,000 844,883,000
Deferred tax assets   123,289,000 125,760,000
Customer relationships      
Amounts preliminarily allocated to intangible assets, the amortization period and goodwill      
Intangible assets   46,157,000 47,178,000
Favorable leases      
Amounts preliminarily allocated to intangible assets, the amortization period and goodwill      
Intangible assets   5,283,000 5,487,000
KCG      
Amounts preliminarily allocated to intangible assets, the amortization period and goodwill      
Intangible assets $ 174,995,000    
Goodwill 128,286,000    
Total 303,281,000    
Goodwill deductible for tax purposes 0    
Deferred tax assets 23,900,000    
KCG | Technology      
Amounts preliminarily allocated to intangible assets, the amortization period and goodwill      
Intangible assets 67,700,000    
KCG | Customer relationships      
Amounts preliminarily allocated to intangible assets, the amortization period and goodwill      
Intangible assets 94,000,000    
KCG | Trade names      
Amounts preliminarily allocated to intangible assets, the amortization period and goodwill      
Intangible assets $ 1,000,000    
Amortization Years 10 years    
KCG | Favorable leases      
Amounts preliminarily allocated to intangible assets, the amortization period and goodwill      
Intangible assets $ 5,895,000    
KCG | Exchange memberships      
Amounts preliminarily allocated to intangible assets, the amortization period and goodwill      
Intangible assets $ 6,400,000    
Minimum | KCG | Technology      
Amounts preliminarily allocated to intangible assets, the amortization period and goodwill      
Amortization Years 1 year    
Minimum | KCG | Customer relationships      
Amounts preliminarily allocated to intangible assets, the amortization period and goodwill      
Amortization Years 13 years    
Minimum | KCG | Favorable leases      
Amounts preliminarily allocated to intangible assets, the amortization period and goodwill      
Amortization Years 2 years    
Maximum | KCG | Technology      
Amounts preliminarily allocated to intangible assets, the amortization period and goodwill      
Amortization Years 6 years    
Maximum | KCG | Customer relationships      
Amounts preliminarily allocated to intangible assets, the amortization period and goodwill      
Amortization Years 17 years    
Maximum | KCG | Favorable leases      
Amounts preliminarily allocated to intangible assets, the amortization period and goodwill      
Amortization Years 15 years    
Market Making      
Amounts preliminarily allocated to intangible assets, the amortization period and goodwill      
Goodwill $ 96,200,000 $ 755,292,000 $ 755,292,000
Technology and Execution Services      
Amounts preliminarily allocated to intangible assets, the amortization period and goodwill      
Goodwill $ 32,100,000