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Segment Operating Results (Footnotes) (Detail) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Segment Reporting Information [Line Items]        
Other Revenue, net $ 1,227 $ (2,959) $ (115) $ (4,695)
Special Charges 0 (139) 0 5,499
Acquisition and Transition Costs (329) 917 (329) 1,401
Other Expenses 23,835 22,895 58,945 58,560
Investment Banking [Member]        
Segment Reporting Information [Line Items]        
Other Revenue, net 983 (2,173) 70 (3,231)
Interest expense on Senior Notes 2,876 1,793 4,354 3,437
Amortization of LP Units / Interests and Certain Other Awards 20,738 18,193 52,497 44,143
Other Acquisition Related Compensation Charges 0 952 0 1,537
Special Charges 0 (139) 0 2,151
Acquisition and Transition Costs (733) 906 (733) 1,390
Changes To Fair Value Of Contingent Consideration 581 0 687 0
Intangible Asset and Other Amortization 2,818 2,890 5,981 5,816
Other Expenses 23,404 22,802 58,432 55,037
Investment Management [Member]        
Segment Reporting Information [Line Items]        
Other Revenue, net 244 (786) (185) (1,464)
Interest expense on Senior Notes   959 670 1,912
Special Charges 0 0 0 3,348
Acquisition and Transition Costs 404 11 404 11
Intangible Asset and Other Amortization 27 82 109 164
Other Expenses $ 431 $ 93 $ 513 $ 3,523