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Summary of Significant Accounting Policies - Schedule of Revenue Concentration (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012 Financial_Instrument	Dec. 31, 2011 Financial_Instrument	Dec. 31, 2010 Financial_Instrument
Business Concentration [Line Items]
CDO asset management revenue and related service agreements	$ 21,729	$ 19,055	$ 19,850
Total asset management revenue	23,172	21,698	25,281
Total revenues	$ 95,240	$ 100,331	$ 125,552
CDO asset management % as compared to total asset management fees	94.00%	88.00%	79.00%
CDO asset management % as compared to total revenues	23.00%	19.00%	16.00%
Number of CDOs generating management fees	25	26	34

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Collateralized Debt Obligation Asset Management Percentage Compare to Total Asset Management Fees

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Collateralized Debt Obligation Asset Management Percentage Compare to Total Revenues

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Collateralized Debt Obligation Asset Management Revenue and Related Service Agreements

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Number of Collateralized Debt Obligations Generating Management Fees

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Revenue recognized in the period for (1) performance (incentive) fees based on the investment results achieved for management of certain institutional accounts and hedge funds, (2) schedule-based fees earned for management of mutual funds and closed-end funds, based either on average daily net assets or on a combination of the average daily net assets and gross income, and (3) other investment management and advisory fees.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 225

-Section S99

-Paragraph 1

-Subparagraph (SX 210.9-04.13(a),(d))

-URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882



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

-Publisher AICPA

-Name Audit and Accounting Guide (AAG)

-Number AAG-BRD

-Paragraph 9, 51, 59

-IssueDate 2006-05-01

-Chapter 4

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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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Aggregate revenue recognized during the period (derived from goods sold, services rendered, insurance premiums, or other activities that constitute an entity's earning process). For financial services companies, also includes investment and interest income, and sales and trading gains.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 225

-SubTopic 10

-Section S99

-Paragraph 2

-Subparagraph (SX 210.5-03.1)

-URI http://asc.fasb.org/extlink&oid=6880815&loc=d3e20235-122688



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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 1

-Article 5

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