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Consolidated Statements of Income (USD $)	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
REVENUES:
Investment advisory	$ 25,400,536us-gaap_InvestmentAdvisoryFees	$ 19,910,807us-gaap_InvestmentAdvisoryFees
Mutual fund administration, net	3,917,871dhil_RevenueFromAdministrativeServicesNet	3,278,290dhil_RevenueFromAdministrativeServicesNet
Total revenue	29,318,407us-gaap_Revenues	23,189,097us-gaap_Revenues
OPERATING EXPENSES:
Compensation and related costs	12,784,781us-gaap_LaborAndRelatedExpense	11,871,954us-gaap_LaborAndRelatedExpense
General and administrative	1,993,547us-gaap_GeneralAndAdministrativeExpense	1,581,356us-gaap_GeneralAndAdministrativeExpense
Sales and marketing	609,700us-gaap_SellingAndMarketingExpense	491,882us-gaap_SellingAndMarketingExpense
Mutual fund administration	736,373us-gaap_AssetManagementCosts	672,121us-gaap_AssetManagementCosts
Total operating expenses	16,124,401us-gaap_OperatingExpenses	14,617,313us-gaap_OperatingExpenses
NET OPERATING INCOME	13,194,006us-gaap_OperatingIncomeLoss	8,571,784us-gaap_OperatingIncomeLoss
Investment income	1,344,683us-gaap_InvestmentIncomeNonoperating	516,529us-gaap_InvestmentIncomeNonoperating
INCOME BEFORE TAXES	14,538,689us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	9,088,313us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
Income tax expense	(5,026,067)us-gaap_IncomeTaxExpenseBenefit	(3,338,715)us-gaap_IncomeTaxExpenseBenefit
NET INCOME	$ 9,512,622us-gaap_NetIncomeLoss	$ 5,749,598us-gaap_NetIncomeLoss
Earnings per share
Basic (USD per share)	$ 2.96us-gaap_EarningsPerShareBasic	$ 1.82us-gaap_EarningsPerShareBasic
Diluted (USD per share)	$ 2.89us-gaap_EarningsPerShareDiluted	$ 1.78us-gaap_EarningsPerShareDiluted
Weighted average shares outstanding
Basic (in shares)	3,218,154us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	3,165,940us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Diluted (in shares)	3,296,168us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	3,230,900us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding

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