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Business Changes and Developments Intangible Assets Associated with Acquisitions (Detail) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2013 | Dec. 31, 2012
--- | --- | ---
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Intangible assets, Gross | $ 54,269 | $ 55,399
Intangible Assets, accumulated amortization | 27,538 | 20,002
Client Related [Member] |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Intangible assets, Gross | 48,130 | 49,260
Intangible Assets, accumulated amortization | 23,858 | 17,381
Acquired Mandates [Member] |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Intangible assets, Gross | 1,810 | 1,810
Intangible Assets, accumulated amortization | 1,786 | 1,324
Non-compete/Non-solicit Agreements [Member] |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Intangible assets, Gross | 2,084 | 2,084
Intangible Assets, accumulated amortization | 1,408 | 987
Other [Member] |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Intangible assets, Gross | 2,245 | 2,245
Intangible Assets, accumulated amortization | 486 | 310
Investment Banking [Member] |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Intangible assets, Gross | 4,245 | 4,245
Intangible Assets, accumulated amortization | 3,179 | 2,360
Investment Banking [Member] | Client Related [Member] |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Intangible assets, Gross | 2,300 | 2,300
Intangible Assets, accumulated amortization | 1,299 | 969
Investment Banking [Member] | Acquired Mandates [Member] |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Intangible assets, Gross | 1,810 | 1,810
Intangible Assets, accumulated amortization | 1,786 | 1,324
Investment Banking [Member] | Non-compete/Non-solicit Agreements [Member] |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Intangible assets, Gross | 135 | 135
Intangible Assets, accumulated amortization | 94 | 67
Investment Banking [Member] | Other [Member] |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Intangible assets, Gross | 0 | 0
Intangible Assets, accumulated amortization | 0 | 0
Investment Management [Member] |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Intangible assets, Gross | 50,024 | 51,154
Intangible Assets, accumulated amortization | 24,359 | 17,642
Investment Management [Member] | Client Related [Member] |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Intangible assets, Gross | 45,830 | 46,960
Intangible Assets, accumulated amortization | 22,559 | 16,412
Investment Management [Member] | Acquired Mandates [Member] |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Intangible assets, Gross | 0 | 0
Intangible Assets, accumulated amortization | 0 | 0
Investment Management [Member] | Non-compete/Non-solicit Agreements [Member] |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Intangible assets, Gross | 1,949 | 1,949
Intangible Assets, accumulated amortization | 1,314 | 920
Investment Management [Member] | Other [Member] |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Intangible assets, Gross | 2,245 | 2,245
Intangible Assets, accumulated amortization | $ 486 | $ 310

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