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Consolidated Statements of Cash Flows (USD $)
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
CASH FLOWS FROM OPERATING ACTIVITIES:      
Net Income $ 31,580,931us-gaap_NetIncomeLoss $ 22,154,828us-gaap_NetIncomeLoss $ 16,930,892us-gaap_NetIncomeLoss
Adjustments to reconcile net income to net cash provided by operating activities:      
Depreciation 301,936us-gaap_Depreciation 306,005us-gaap_Depreciation 305,897us-gaap_Depreciation
Stock-based compensation 7,303,799us-gaap_ShareBasedCompensation 7,319,401us-gaap_ShareBasedCompensation 5,750,981us-gaap_ShareBasedCompensation
Increase in accounts receivable (3,511,851)us-gaap_IncreaseDecreaseInAccountsReceivable (2,563,697)us-gaap_IncreaseDecreaseInAccountsReceivable (142,875)us-gaap_IncreaseDecreaseInAccountsReceivable
Change in current income taxes (3,324,298)us-gaap_IncreaseDecreaseInAccruedIncomeTaxesPayable 8,520,834us-gaap_IncreaseDecreaseInAccruedIncomeTaxesPayable (105,166)us-gaap_IncreaseDecreaseInAccruedIncomeTaxesPayable
Change in deferred income taxes 2,404,433us-gaap_IncreaseDecreaseInDeferredIncomeTaxes (5,616,211)us-gaap_IncreaseDecreaseInDeferredIncomeTaxes (368,572)us-gaap_IncreaseDecreaseInDeferredIncomeTaxes
Net investment gain (1,517,662)us-gaap_GainLossOnInvestments (4,270,928)us-gaap_GainLossOnInvestments (1,135,598)us-gaap_GainLossOnInvestments
Increase in accrued compensation 8,518,476us-gaap_IncreaseDecreaseInEmployeeRelatedLiabilities 8,797,907us-gaap_IncreaseDecreaseInEmployeeRelatedLiabilities 5,469,062us-gaap_IncreaseDecreaseInEmployeeRelatedLiabilities
Excess income tax benefit from stock-based compensation (666,889)us-gaap_ExcessTaxBenefitFromShareBasedCompensationOperatingActivities (425,380)us-gaap_ExcessTaxBenefitFromShareBasedCompensationOperatingActivities (34,543)us-gaap_ExcessTaxBenefitFromShareBasedCompensationOperatingActivities
Income tax benefit from dividends paid on unvested shares (296,755)dhil_IncomeTaxBenefitFromDividendsPaidOnUnvestedSharesOperatingActivities (357,188)dhil_IncomeTaxBenefitFromDividendsPaidOnUnvestedSharesOperatingActivities (1,992,298)dhil_IncomeTaxBenefitFromDividendsPaidOnUnvestedSharesOperatingActivities
Other changes in assets and liabilities 1,827,723us-gaap_IncreaseDecreaseInOtherOperatingCapitalNet 715,570us-gaap_IncreaseDecreaseInOtherOperatingCapitalNet (131,087)us-gaap_IncreaseDecreaseInOtherOperatingCapitalNet
Net cash provided by operating activities 42,619,843us-gaap_NetCashProvidedByUsedInOperatingActivities 34,581,141us-gaap_NetCashProvidedByUsedInOperatingActivities 24,546,693us-gaap_NetCashProvidedByUsedInOperatingActivities
CASH FLOWS FROM INVESTING ACTIVITIES:      
Purchase of property and equipment (1,504,368)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment (525,472)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment (221,592)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
Cost of investments purchased and other portfolio activity (25,433,201)us-gaap_PaymentsToAcquireInvestments (2,306,947)us-gaap_PaymentsToAcquireInvestments (7,463,796)us-gaap_PaymentsToAcquireInvestments
Proceeds from sale of investments 249,477us-gaap_ProceedsFromSaleMaturityAndCollectionsOfInvestments 4,355,536us-gaap_ProceedsFromSaleMaturityAndCollectionsOfInvestments 304,152us-gaap_ProceedsFromSaleMaturityAndCollectionsOfInvestments
Net cash provided by (used in) investing activities (26,688,092)us-gaap_NetCashProvidedByUsedInInvestingActivities 1,523,117us-gaap_NetCashProvidedByUsedInInvestingActivities (7,381,236)us-gaap_NetCashProvidedByUsedInInvestingActivities
CASH FLOWS FROM FINANCING ACTIVITIES:      
Value of shares withheld related to employee tax withholding (976,343)us-gaap_PaymentsRelatedToTaxWithholdingForShareBasedCompensation (1,884,187)us-gaap_PaymentsRelatedToTaxWithholdingForShareBasedCompensation (1,348,262)us-gaap_PaymentsRelatedToTaxWithholdingForShareBasedCompensation
Excess income tax benefit from stock-based compensation 666,889us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities 425,380us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities 34,543us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities
Income tax benefit from dividends paid on unvested shares 296,755dhil_IncomeTaxBenefitFromDividendsPaidOnUnvestedSharesFinancingActivities 357,188dhil_IncomeTaxBenefitFromDividendsPaidOnUnvestedSharesFinancingActivities 1,992,298dhil_IncomeTaxBenefitFromDividendsPaidOnUnvestedSharesFinancingActivities
Payment of dividends (13,248,884)us-gaap_PaymentsOfDividendsCommonStock (9,766,575)us-gaap_PaymentsOfDividendsCommonStock (25,215,896)us-gaap_PaymentsOfDividendsCommonStock
Net cash used in financing activities (13,261,583)us-gaap_NetCashProvidedByUsedInFinancingActivities (10,868,194)us-gaap_NetCashProvidedByUsedInFinancingActivities (24,537,317)us-gaap_NetCashProvidedByUsedInFinancingActivities
CASH AND CASH EQUIVALENTS      
Net change during the year 2,670,168us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease 25,236,064us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease (7,371,860)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
At beginning of year 33,106,972us-gaap_CashAndCashEquivalentsAtCarryingValue 7,870,908us-gaap_CashAndCashEquivalentsAtCarryingValue 15,242,768us-gaap_CashAndCashEquivalentsAtCarryingValue
At end of year 35,777,140us-gaap_CashAndCashEquivalentsAtCarryingValue 33,106,972us-gaap_CashAndCashEquivalentsAtCarryingValue 7,870,908us-gaap_CashAndCashEquivalentsAtCarryingValue
Supplemental cash flow information:      
Interest paid 0us-gaap_InterestPaid 0us-gaap_InterestPaid 0us-gaap_InterestPaid
Income taxes paid 19,704,817us-gaap_IncomeTaxesPaid 10,575,000us-gaap_IncomeTaxesPaid 9,636,000us-gaap_IncomeTaxesPaid
Supplemental disclosure of non-cash transactions:      
Grant Date Value $ 3,984,816us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation $ 4,606,008us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation $ 5,540,792us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation