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Segment Operating Results (Detail) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Dec. 31, 2015
Segment Reporting Information [Line Items]      
Net Revenues $ 257,713 $ 237,983  
Operating Expenses 206,478 191,320  
Other Expenses 35,110 35,665  
Income Before Income from Equity Method Investments and Income Taxes 16,125 10,998  
Income (Loss) from Equity Method Investments 1,287 1,107  
Pre-Tax Income (Loss) 17,412 12,105  
Identifiable Segment Assets 1,284,677 1,289,209 $ 1,479,171
Investment Banking [Member]      
Segment Reporting Information [Line Items]      
Net Revenues 239,713 216,580  
Operating Expenses 192,264 171,364  
Other Expenses 35,028 32,235  
Income Before Income from Equity Method Investments and Income Taxes 12,421 12,981  
Income (Loss) from Equity Method Investments (272) (37)  
Pre-Tax Income (Loss) 12,149 12,944  
Identifiable Segment Assets 940,859 769,746  
Investment Management [Member]      
Segment Reporting Information [Line Items]      
Net Revenues 18,000 21,403  
Operating Expenses 14,214 19,956  
Other Expenses 82 3,430  
Income Before Income from Equity Method Investments and Income Taxes 3,704 (1,983)  
Income (Loss) from Equity Method Investments 1,559 1,144  
Pre-Tax Income (Loss) 5,263 (839)  
Identifiable Segment Assets $ 343,818 $ 519,463