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Segment Operating Results (Footnotes) (Detail) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Segment Reporting Information [Line Items]    
Other Revenue, net $ (1,342) $ (1,736)
Special Charges 0 5,638
Acquisition and Transition Costs 0 484
Other Expenses 35,110 35,665
Investment Banking [Member]    
Segment Reporting Information [Line Items]    
Other Revenue, net (913) (1,058)
Interest expense on Senior Notes 1,478 1,644
Amortization of LP Units / Interests and Certain Other Awards 31,759 25,950
Other Acquisition Related Compensation Charges 0 585
Special Charges 0 2,290
Acquisition and Transition Costs 0 484
Changes To Fair Value Of Contingent Consideration 106 0
Intangible Asset and Other Amortization 3,163 2,926
Other Expenses 35,028 32,235
Investment Management [Member]    
Segment Reporting Information [Line Items]    
Other Revenue, net (429) (678)
Interest expense on Senior Notes 670 953
Special Charges 0 3,348
Intangible Asset and Other Amortization 82 82
Other Expenses $ 82 $ 3,430