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Investment Portfolio - Summary of Market Value of Investments (Detail) - USD ($)	Mar. 31, 2017	Dec. 31, 2016
Investment Holdings [Line Items]
Company sponsored equity method investments	$ 30,827,940	$ 36,457,449
Deferred compensation investments	18,683,617	14,182,470
Total Investment portfolio	117,424,036	108,015,635
Securities held in Consolidated Funds
Investment Holdings [Line Items]
Trading investments	61,452,815	57,355,471
Securities held in Consolidated Funds | Total
Investment Holdings [Line Items]
Trading investments	43,900,000	42,600,000
Securities held in Consolidated Funds | Redeemable Noncontrolling Interest
Investment Holdings [Line Items]
Trading investments	17,600,000	14,700,000
Company sponsored investments
Investment Holdings [Line Items]
Trading investments	$ 6,459,664	$ 20,245

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