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Investment Portfolio - Summary of Market Value of Investments (Detail) - USD ($)	Jun. 30, 2016	Dec. 31, 2015
Investment Holdings [Line Items]
Equity method investments	$ 26,752,420
Deferred compensation investments	12,552,132
Total Investment portfolio	57,981,889	$ 52,490,820
Equity securities held in consolidated ETF
Investment Holdings [Line Items]
Trading investments	17,793,918
Equity securities held in consolidated ETF | Total
Investment Holdings [Line Items]
Trading investments	12,100,000
Equity securities held in consolidated ETF | Redeemable Noncontrolling Interest
Investment Holdings [Line Items]
Trading investments	5,700,000
Seed capital investments
Investment Holdings [Line Items]
Trading investments	$ 883,419

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