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

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