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Intangible Assets, Net - Summary of Intangible Assets, Net (Detail) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2014
Dec. 31, 2013
Sep. 30, 2013
Dec. 31, 2012
Definite-lived intangible assets:        
Investment contracts $ 158,747 $ 157,882    
Accumulated amortization (148,453) (145,665)    
Definite-lived intangible assets, net 10,294 12,217    
Indefinite-lived intangible assets 32,416 32,416    
Total intangible assets, net $ 42,710 $ 44,633 $ 45,907 $ 48,711