Goodwill and Other Intangible Assets - Summary of Intangible Assets, Net (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Definite-lived intangible assets, net:
Investment contracts	$ 157,882	$ 197,704
Accumulated amortization	(145,665)	(181,409)
Definite-lived intangible assets, net	12,217	16,295
Indefinite-lived intangible assets	32,416	32,416
Total intangible assets, net	$ 44,633	$ 48,711	$ 52,096	$ 52,977