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Intangible Assets, Net - Summary of Intangible Assets (Detail) (USD $) In Thousands, unless otherwise specified | Jun. 30, 2013 | Dec. 31, 2012 | Jun. 30, 2012 | Dec. 31, 2011
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Definite-lived intangible assets: |  |  |  |
Investment contracts | $ 184,871 | $ 197,704 |  |
Accumulated amortization | (170,681) | (181,409) |  |
Definite-lived intangible assets, net | 14,190 | 16,295 |  |
Indefinite-lived intangible assets | 32,416 | 32,416 |  |
Total intangible assets, net | $ 46,606 | $ 48,711 | $ 50,187 | $ 52,096

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