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Intangible Assets, Net - Summary of Intangible Assets (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012	Mar. 31, 2012	Dec. 31, 2011
Definite-lived intangible assets:
Investment contracts	$ 184,871	$ 197,704
Accumulated amortization	(169,629)	(181,409)
Definite-lived intangible assets, net	15,242	16,295
Indefinite-lived intangible assets	32,416	32,416
Total intangible assets, net	$ 47,658	$ 48,711	$ 51,141	$ 52,096

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Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

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