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Special Charges, Including Business Realignment Costs, and Intangible Asset Amortization (Details)
$ in Thousands, $ in Thousands
1 Months Ended 3 Months Ended 12 Months Ended
Apr. 30, 2020
MXN ($)
Mar. 31, 2020
USD ($)
Mar. 31, 2019
USD ($)
Dec. 31, 2020
USD ($)
Business Acquisition [Line Items]        
Special Charges, Including Business Realignment Costs   $ 23,676 $ 1,029  
Headcount Reductions (as a percent)   6.00%    
Special Charges [Member]        
Business Acquisition [Line Items]        
Restructuring Charges   $ 22,127    
Accelerated Depreciation For Leasehold Improvements   1,549    
Investment Banking [Member]        
Business Acquisition [Line Items]        
Special Charges, Including Business Realignment Costs   23,644 1,029  
Amortization of Intangible Assets   507 2,190  
Investment Management [Member]        
Business Acquisition [Line Items]        
Special Charges, Including Business Realignment Costs   32 0  
Amortization of Intangible Assets   $ 108 $ 110  
Forecast [Member] | Special Charges [Member]        
Business Acquisition [Line Items]        
Restructuring Charges       $ 38,000
Subsequent Event [Member]        
Business Acquisition [Line Items]        
Proceeds from Divestiture of Businesses $ 35,000