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Segment Operating Results (Detail) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Dec. 31, 2015
Segment Reporting Information [Line Items]          
Net Revenues $ 386,314 $ 308,951 $ 994,683 $ 815,030  
Operating Expenses 283,509 238,840 754,203 644,250  
Other Expenses 17,720 58,213 76,665 116,773  
Income Before Income from Equity Method Investments and Income Taxes 85,085 11,898 163,815 54,007  
Income (Loss) from Equity Method Investments 1,178 929 4,129 4,034  
Pre-Tax Income (Loss) 86,263 12,827 167,944 58,041  
Identifiable Segment Assets 1,461,630 1,330,389 1,461,630 1,330,389 $ 1,479,171
Investment Banking [Member]          
Segment Reporting Information [Line Items]          
Net Revenues 368,634 285,918 936,504 746,875  
Operating Expenses 268,666 220,565 707,846 586,200  
Other Expenses 17,422 30,131 75,854 85,168  
Income Before Income from Equity Method Investments and Income Taxes 82,546 35,222 152,804 75,507  
Income (Loss) from Equity Method Investments (112) (528) (94) 238  
Pre-Tax Income (Loss) 82,434 34,694 152,710 75,745  
Identifiable Segment Assets 1,114,565 919,000 1,114,565 919,000  
Investment Management [Member]          
Segment Reporting Information [Line Items]          
Net Revenues 17,680 23,033 58,179 68,155  
Operating Expenses 14,843 18,275 46,357 58,050  
Other Expenses 298 28,082 811 31,605  
Income Before Income from Equity Method Investments and Income Taxes 2,539 (23,324) 11,011 (21,500)  
Income (Loss) from Equity Method Investments 1,290 1,457 4,223 3,796  
Pre-Tax Income (Loss) 3,829 (21,867) 15,234 (17,704)  
Identifiable Segment Assets $ 347,065 $ 411,389 $ 347,065 $ 411,389