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Segment Operating Results (Parenthetical) (Detail) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2013 | Sep. 30, 2012 | Sep. 30, 2013 | Sep. 30, 2012
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |
Total Other Revenue, net | $ (885) |  | $ (1,255) |  | $ (2,820) |  | $ (4,681) |
Special Charges | 0 |  | 0 |  | 0 |  | 662 |
Total Other Expenses | 8,020 | [1] | 12,735 | [1] | 28,677 | [1] | 42,004 | [1]
Investment Banking [Member] |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |
Total Other Revenue, net | (330) | [2] | (435) | [2] | (966) | [2] | (2,407) | [2]
Interest expense on Senior Notes | 1,098 |  | 1,082 |  | 3,281 |  | 3,227 |
Amortization of LP Units and Certain Other Awards | 4,304 |  | 4,866 |  | 13,513 |  | 13,577 |
Acquisition Related Compensation Charges | 3,123 |  | 6,802 |  | 13,225 |  | 22,799 |
Special Charges | 0 |  | 0 |  | 0 |  | 662 |
Intangible Asset Amortization | 0 |  | 389 |  | 0 |  | 3,024 |
Total Investment Banking | 7,427 | [1] | 12,057 | [1] | 26,738 | [1] | 40,062 | [1]
Investment Management [Member] |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |
Total Other Revenue, net | (555) | [3] | (820) | [3] | (1,854) | [3] | (2,274) | [3]
Interest expense on Senior Notes | 927 |  | 914 |  | 2,770 |  | 2,727 |
Amortization of LP Units and Certain Other Awards | 511 |  | 596 |  | 1,693 |  | 1,696 |
Intangible Asset Amortization | 82 |  | 82 |  | 246 |  | 246 |
Total Investment Management | $ 593 | [1] | $ 678 | [1] | $ 1,939 | [1] | $ 1,942 | [1]
[1] | Other Expenses are as follows: For the Three Months Ended September 30, For the Nine Months Ended September 30, 2013 2012 2013 2012Investment Banking Amortization of LP Units and Certain Other Awards$4,304 $4,866 $13,513 $13,577Acquisition Related Compensation Charges3,123 6,802 13,225 22,799Special Charges— — — 662Intangible Asset Amortization— 389 — 3,024Total Investment Banking7,427 12,057 26,738 40,062Investment Management Amortization of LP Units and Certain Other Awards511 596 1,693 1,696Intangible Asset Amortization82 82 246 246Total Investment Management593 678 1,939 1,942Total Other Expenses$8,020 $12,735 $28,677 $42,004
[2] | Investment Banking Other Revenue, net, includes interest expense on the Senior Notes of $1,098 and $3,281 for the three and nine months ended September 30, 2013, respectively, and $1,082 and $3,227 for the three and nine months ended September 30, 2012, respectively.
[3] | Investment Management Other Revenue, net, includes interest expense on the Senior Notes of $927 and $2,770 for the three and nine months ended September 30, 2013, respectively, and $914 and $2,727 for the three and nine months ended September 30, 2012, respectively.

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