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Significant Accounting Policies - Mutual Fund Administration Gross and Net Revenue (Detail) (USD $) | 3 Months Ended
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Mar. 31, 2015 | Mar. 31, 2014
Mutual fund administration: |  |
Administration revenue, gross | $ 6,379,960 us-gaap_AdministrativeServicesRevenue | $ 5,043,417 us-gaap_AdministrativeServicesRevenue
12b-1/service fees and commission revenue received from fund clients | 2,744,151 us-gaap_FeesAndCommissions | 2,481,771 us-gaap_FeesAndCommissions
12b-1/service fees and commission expense payments to third parties | (2,373,863)dhil_ServiceFeesAndCommissionExpensePaymentsToThirdParties | (2,156,513)dhil_ServiceFeesAndCommissionExpensePaymentsToThirdParties
Fund related expense | (2,838,794)dhil_FundRelatedExpense | (2,089,175)dhil_FundRelatedExpense
Revenue, net of related expenses | 3,911,454 dhil_RevenueFromAdministrativeServicesExcludingFinancialActivityNet | 3,279,500 dhil_RevenueFromAdministrativeServicesExcludingFinancialActivityNet
DHCM C-Share financing: |  |
Broker commission advance repayments | 251,360 dhil_BrokerCommissionAdvanceRepayments | 173,890 dhil_BrokerCommissionAdvanceRepayments
Broker commission amortization | (244,943)dhil_BrokerCommissionAmortization | (175,100)dhil_BrokerCommissionAmortization
Financing activity, net | 6,417 dhil_FinancingActivityNet | (1,210)dhil_FinancingActivityNet
Mutual fund administration revenue, net | $ 3,917,871 dhil_RevenueFromAdministrativeServicesNet | $ 3,278,290 dhil_RevenueFromAdministrativeServicesNet

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- Definition Broker commission advance repayments. + References No definition available. + Details
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- Definition Financing activity, net. + References No definition available. + Details
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- Details
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- Definition Revenue from administrative services excluding financial activity net. + References No definition available. + Details
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- Definition Service fees and commission expense payments to third parties. + References No definition available. + Details
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- Details
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- Definition Amount of revenue from providing administrative services, including, but not limited to, accounting, tax, legal, regulatory filing, and share registration activities of managed funds and investment accounts of independent third parties and related and affiliated entities. + References No definition available. + Details
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- Definition Amount of fees and commissions from financial services and banking activities and correspondent clearing. Includes fees from depositor accounts, credit cards, merchant discounts, and fiduciary and trust activities, guarantee fees, investment advisory, management, and administrative fees, transfer agent fees, and insurance commissions. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.13) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 13 -Article 9 + Details
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