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Investment Portfolio - Summary of Market Value of Investments (Detail) - USD ($)	Mar. 31, 2016	Dec. 31, 2015
Investment Holdings [Line Items]
Equity method investments	$ 17,846,201
Deferred compensation investments	12,520,233
Total Investment portfolio	56,189,839	$ 52,490,820
Equity securities held in consolidated ETF
Investment Holdings [Line Items]
Trading investments	16,394,754
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	4,300,000
Seed capital investments
Investment Holdings [Line Items]
Trading investments	$ 9,428,651

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Carrying amount as of the balance sheet date of assets held under deferred compensation agreements.

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