Goodwill and Other Intangible Assets - Summary of Intangible Assets (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Intangible Assets Net Excluding Goodwill [Line Items]
Investment contracts	$ 197,704	$ 269,489
Accumulated amortization	(181,409)	(249,809)
Definite-lived intangible assets, net	16,295	19,680
Indefinite-lived intangible assets	32,416	32,416
Intangible assets, net	$ 48,711	$ 52,096	$ 52,977	$ 54,844

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

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