Goodwill and Identifiable Intangible Assets (Details) (USD $)	12 Months Ended
Dec. 31, 2009	Dec. 31, 2011	Dec. 31, 2010
Goodwill and Identifiable Intangible Assets
Goodwill		$ 202,518,000	$ 202,518,000
Accumulated amortization		(36,307,000)	(36,307,000)
Total goodwill		166,211,000	166,211,000
Mutual fund management advisory contracts		38,699,000	38,699,000
Mutual fund management subadvisory contracts		16,300,000	16,300,000
Total identifiable intangible assets		54,999,000	54,999,000
Total goodwill and identifiable intangible assets		221,210,000	221,210,000
Goodwill, annual impairment test
Fair value in excess of carrying value of indefinite-life intangible assets, minimum (as a percent)		90.00%
Impairment charges	$ 27,200,000
Investment management and related services
Goodwill, annual impairment test
Fair value in excess of carrying value of goodwill, minimum (as a percent)		100.00%
Legend
Goodwill, annual impairment test
Fair value in excess of carrying value of goodwill, minimum (as a percent)		65.00%

Carrying amount as of the balance sheet date, which is the cumulative amount paid and (if applicable) the fair value of any noncontrolling interest in the acquiree, adjusted for any amortization recognized prior to the adoption of any changes in generally accepted accounting principles (as applicable) and for any impairment charges, in excess of the fair value of net assets acquired in one or more business combination transactions.

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Gross amount, as of the balance sheet date, of the cumulative amount paid and (if applicable) the fair value of any noncontrolling interest in the acquiree, adjusted for any amortization recognized prior to the adoption of any changes in generally accepted accounting principles (as applicable), in excess of the fair value of net assets acquired in one or more business combination transactions.

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The accumulated impairment losses related to goodwill as of the balance sheet date.

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Loss recognized during the period that results from the write-down of goodwill after comparing the implied fair value of reporting unit goodwill with the carrying amount of that goodwill. Goodwill is assessed at least annually for impairment.

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Sum of the carrying amounts (original costs for current and prior period additions adjusted for impairment, if any) as of the balance sheet date of intangible assets, excluding goodwill, having a projected indefinite period of benefit.

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The summation of Goodwill and Indefinite-lived Intangible Assets. Goodwill is the carrying amount as of the balance sheet date of the cumulative amount paid, adjusted for any amortization recognized and for any impairment charges, in excess of the fair value of net assets acquired in one or more business combination transactions. Indefinite-lived Intangible Assets is the sum of carrying amounts (original costs for current and prior period additions adjusted for impairment, if any) as of the balance sheet date of a intangible assets having a projected indefinite period of benefit.

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Represents the minimum percentage of fair value of indefinite-life intangible assets in excess of carrying value.

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Represents the carrying amount of mutual fund management subadvisory contracts classified as indefinite lived intangible assets as of the balance sheet date.

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