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Related Party Transactions - Jefferies (Detail) - USD ($)
1 Months Ended 3 Months Ended
Dec. 31, 2018
Feb. 28, 2019
Feb. 28, 2018
Jan. 29, 2019
Nov. 30, 2018
Jan. 11, 2018
Related Party Transaction [Line Items]            
Payables-brokers, dealers and clearing organizations   $ 2,767,623,000     $ 2,448,059,000  
Financial instruments owned, at fair value   16,899,559,000     16,399,526,000  
Jefferies | Other Assets            
Related Party Transaction [Line Items]            
Net current tax receivable   9,900,000        
Jefferies | Accrued expenses and other liabilities            
Related Party Transaction [Line Items]            
Net current tax payable         34,100,000  
Payment made to related party related to tax sharing agreement $ 35,000,000.0          
Payments to acquire investments   885,600,000        
Net gain (loss) on investments   0        
Payables-brokers, dealers and clearing organizations   13,800,000     9,900,000  
Jefferies | Affiliated Entity            
Related Party Transaction [Line Items]            
Charges to Jefferies for services provided   16,500,000 $ 16,200,000      
Charges from Jefferies for services received   700,000 2,400,000      
Receivable from Jefferies   2,700,000     1,200,000  
Payable to Jefferies   400,000     2,900,000  
Distribution to affiliates, approved amount       $ 100,000,000.0   $ 200,000,000.0
Payments of distributions to affiliates   30,700,000        
Distribution payable accrued during period   23,000,000.0        
Jefferies | Affiliated Entity | Commissions and other fees            
Related Party Transaction [Line Items]            
Charges to Jefferies for services provided   200,000 0      
Jefferies | Affiliated Entity | Principal transactions            
Related Party Transaction [Line Items]            
Charges to Jefferies for services provided   0 100,000      
Jefferies | Affiliated Entity | Other revenues            
Related Party Transaction [Line Items]            
Charges to Jefferies for services provided   500,000 200,000      
Hedge Fund Managed By Jefferies | Affiliated Entity            
Related Party Transaction [Line Items]            
Net gain (loss) on investments   1,000,000.0 $ 3,700,000      
Investment in related party   219,700,000     218,700,000  
Corporate debt securities | Jefferies | Affiliated Entity            
Related Party Transaction [Line Items]            
Financial instruments owned, at fair value   1,400,000     300,000  
Director | Affiliated Entity            
Related Party Transaction [Line Items]            
Investment in related party   3,600,000     4,600,000  
Director | Hedge Fund Managed By Jefferies | Affiliated Entity            
Related Party Transaction [Line Items]            
Investment in related party   $ 2,500,000     $ 2,700,000