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Segment Information - Reported Revenue and Profit Before Income Taxes (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended				9 Months Ended
	Sep. 30, 2012		Sep. 30, 2011		Sep. 30, 2012		Sep. 30, 2011
Operating Statistics [Line Items]
Total Revenue	$ 231,838		$ 231,619		$ 703,197		$ 729,554
Total, profit before income taxes	5,258		4,264		6,608		15,797
Asset Management [Member]
Operating Statistics [Line Items]
Total Revenue	21,909	[1]	15,783	[1]	65,459	[1]	53,777	[1]
Total, profit before income taxes	4,810	[1]	1,833	[1]	14,752	[1]	10,974	[1]
Private Client [Member]
Operating Statistics [Line Items]
Total Revenue	132,847	[1]	128,154	[1]	403,307	[1]	413,117	[1]
Total, profit before income taxes	5,700	[1]	4,528	[1]	15,798	[1]	18,868	[1]
Capital Markets [Member]
Operating Statistics [Line Items]
Total Revenue	77,082		87,682		234,431		262,660
Total, profit before income taxes	$ (5,252)		$ (2,097)		$ (23,942)		$ (14,045)
[1] Asset management revenue is allocated 22.5% to the Asset Management segment and 77.5% to the Private Client segment.

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- Definition

Sum of operating profit and nonoperating income or expense before Income or Loss from equity method investments, income taxes, extraordinary items, and noncontrolling interest.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 235

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.4-08.(h)(1)(i))

-URI http://asc.fasb.org/extlink&oid=6881521&loc=d3e23780-122690



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 08

-Paragraph h

-Subparagraph 1(i)

-Article 4

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- Definition

Amount of total revenue for the reportable segments, including revenue from external customers, transactions with other operating segments of the same entity, and (gross) interest revenue. All considered to be "operating revenue" for purposes of the taxonomy.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 280

-SubTopic 10

-Section 50

-Paragraph 22

-Subparagraph (a),(b),(c)

-URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e8736-108599



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 131

-Paragraph 27

-Subparagraph a, b, c

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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