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Intangible Assets, Net - Summary of Intangible Assets, Net (Detail) - USD ($) $ in Thousands | Sep. 30, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Dec. 31, 2015
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Definite-lived intangible assets: |  |  |  |
Investment contracts | $ 425,747 | $ 158,747 |  |
Accumulated amortization | (162,246) | (155,136) |  |
Definite-lived intangible assets, net | 263,501 | 3,611 |  |
Indefinite-lived intangible assets | 43,516 | 34,816 |  |
Total intangible assets, net | $ 307,017 | $ 38,427 | $ 39,030 | $ 40,887

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- Definition Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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- Definition Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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