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Intangible Assets, Net - Summary of Intangible Assets, Net (Detail) (USD $) In Thousands, unless otherwise specified | Mar. 31, 2014 | Dec. 31, 2013 | Mar. 31, 2013 | Dec. 31, 2012
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Definite-lived intangible assets: |  |  |  |
Investment contracts | $ 157,672 | $ 157,882 |  |
Accumulated amortization | (146,560) | (145,665) |  |
Definite-lived intangible assets, net | 11,112 | 12,217 |  |
Indefinite-lived intangible assets | 32,416 | 32,416 |  |
Total intangible assets, net | $ 43,528 | $ 44,633 | $ 47,658 | $ 48,711

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