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Business Changes and Developments Goodwill Associated with Acquisitions (Detail) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2013 | Dec. 31, 2012
Goodwill [Roll Forward] |  |  |
Goodwill, Beginning Balance | $ 188,684 |  | $ 177,849
Acquisitions |  |  | 6,500
Foreign Currency Translation and Other | 590 |  | 4,335
Goodwill, Ending Balance | 189,274 | [1] | 188,684
Investment Banking [Member] |  |  |
Goodwill [Roll Forward] |  |  |
Goodwill, Beginning Balance | 86,352 |  | 81,937
Acquisitions |  |  | 0
Foreign Currency Translation and Other | 676 |  | 4,415
Goodwill, Ending Balance | 87,028 | [1] | 86,352
Investment Management [Member] |  |  |
Goodwill [Roll Forward] |  |  |
Goodwill, Beginning Balance | 102,332 |  | 95,912
Acquisitions |  |  | 6,500
Foreign Currency Translation and Other | (86) |  | (80)
Goodwill, Ending Balance | $ 102,246 | [1] | $ 102,332
[1] | The balance includes the net effect of the goodwill related to the consolidation and disposition of Pan.

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- Definition Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=14024403&loc=d3e13816-109267 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266 + Details
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- Definition Amount of increase in asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized resulting from a business combination. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=14024403&loc=d3e13816-109267 + Details
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- Details
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- Definition Amount of increase (decrease) from foreign currency translation adjustments of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=14024403&loc=d3e13816-109267 + Details
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