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Segment information - Reported Revenue and Profit Before Income Taxes (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Revenue
Total Revenue	$ 239,146	$ 238,214
Income (loss) before income taxes
Total, profit before income taxes	6,713	(6,489)
Private client division [Member]
Revenue
Total Revenue	143,369	144,263
Income (loss) before income taxes
Total, profit before income taxes	17,327	14,962
Asset management [Member]
Revenue
Total Revenue	20,956	19,044
Income (loss) before income taxes
Total, profit before income taxes	6,543	4,990
Capital markets [Member]
Revenue
Total Revenue	65,131	69,329
Income (loss) before income taxes
Total, profit before income taxes	3,533	(1,655)
Commercial mortgage banking [Member]
Revenue
Total Revenue	8,066	8,054
Income (loss) before income taxes
Total, profit before income taxes	2,878	3,830
Corporate/Other [Member]
Revenue
Total Revenue	1,624	(2,476)
Income (loss) before income taxes
Total, profit before income taxes	$ (23,568)	$ (28,616)

X

- Definition

This element represents the income or loss from continuing operations attributable to the economic entity which may also be defined as revenue less expenses from ongoing operations, after income or loss from equity method investments, but before income taxes, extraordinary items, and noncontrolling interest.

+ References

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 10

-Article 5

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X

- 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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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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