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Investment Portfolio - Summary of Partnership Investments (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Carrying value and income from the Partnerships
Total partnership assets	$ 128,182,211dhil_PartnershipAssets	$ 122,106,403dhil_PartnershipAssets	$ 105,472,952dhil_PartnershipAssets
Total partnership liabilities	21,782,571dhil_PartnershipLiabilities	25,217,600dhil_PartnershipLiabilities	17,786,579dhil_PartnershipLiabilities
Net partnership assets	106,399,640dhil_NetPartnershipAssets	96,888,803dhil_NetPartnershipAssets	87,686,373dhil_NetPartnershipAssets
DHCM’s portion of net assets	14,652,589dhil_PortionOfNetPartnershipAssets	3,001,461dhil_PortionOfNetPartnershipAssets	3,650,561dhil_PortionOfNetPartnershipAssets
Net partnership income	8,870,418dhil_NetPartnershipIncome	24,294,495dhil_NetPartnershipIncome	15,054,951dhil_NetPartnershipIncome
DHCM’s portion of net income	$ 491,951dhil_PortionInNetPartnershipIncome	$ 899,958dhil_PortionInNetPartnershipIncome	$ 472,659dhil_PortionInNetPartnershipIncome