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Segment Operating Results (Footnotes) (Detail) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Segment Reporting Information [Line Items]        
Other Revenue, net $ 722 $ (422) $ 607 $ (5,117)
Special Charges 0 28,000 0 33,499
Acquisition and Transition Costs 339 538 10 1,939
Other Expenses 17,720 58,213 76,665 116,773
Investment Banking [Member]        
Segment Reporting Information [Line Items]        
Other Revenue, net 200 357 270 (2,874)
Interest expense on Senior Notes 2,592 1,452 6,946 4,889
Amortization of LP Units / Interests and Certain Other Awards 13,859 21,980 66,356 66,123
Other Acquisition Related Compensation Charges 0 0 0 1,537
Special Charges 0 0 0 2,151
Acquisition and Transition Costs 41 538 (692) 1,928
Changes To Fair Value Of Contingent Consideration 984 2,797 1,671 2,797
Intangible Asset and Other Amortization 2,538 4,816 8,519 10,632
Other Expenses 17,422 30,131 75,854 85,168
Investment Management [Member]        
Segment Reporting Information [Line Items]        
Other Revenue, net 522 (779) 337 (2,243)
Interest expense on Senior Notes   962 670 2,874
Special Charges 0 28,000 0 31,348
Acquisition and Transition Costs 298 0 702 11
Intangible Asset and Other Amortization 0 82 109 246
Other Expenses $ 298 $ 28,082 $ 811 $ 31,605