XML 52 R26.htm IDEA: XBRL DOCUMENT
v2.4.0.8

Significant Accounting Policies - Mutual Fund Administration Gross and Net Revenue (Detail) (USD $) | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2014 | Jun. 30, 2013 | Jun. 30, 2014 | Jun. 30, 2013
Mutual fund administration: |  |  |  |
Administration revenue, gross | $ 5,565,081 | $ 4,015,154 | $ 10,608,498 | $ 7,630,884
12b-1/service fees and commission revenue received from fund clients | 2,689,494 | 1,984,681 | 5,171,264 | 3,797,068
12b-1/service fees and commission expense payments to third parties | (2,342,897) | (1,738,197) | (4,499,409) | (3,327,009)
Fund related expense | (2,419,569) | (1,439,651) | (4,508,744) | (2,760,223)
Revenue, net of fund related expenses | 3,492,109 | 2,821,987 | 6,771,609 | 5,340,720
DHCM C-Share financing: |  |  |  |
Broker commission advance repayments | 218,108 | 64,674 | 391,999 | 121,332
Broker commission amortization | (210,100) | (62,881) | (385,202) | (116,890)
Financing activity, net | 8,008 | 1,793 | 6,797 | 4,442
Mutual fund administration revenue, net | $ 3,500,117 | $ 2,823,780 | $ 6,778,406 | $ 5,345,162

X
- Definition Broker commission advance repayments. + References No definition available. + Details
Name: | dhil_BrokerCommissionAdvanceRepayments
Namespace Prefix: | dhil_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Broker commission amortization. + References No definition available. + Details
Name: | dhil_BrokerCommissionAmortization
Namespace Prefix: | dhil_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Financing activity, net. + References No definition available. + Details
Name: | dhil_FinancingActivityNet
Namespace Prefix: | dhil_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Fund related expense. + References No definition available. + Details
Name: | dhil_FundRelatedExpense
Namespace Prefix: | dhil_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Details
Name: | dhil_MutualFundAdministrationAbstract
Namespace Prefix: | dhil_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Revenue from administrative services excluding financial activity net. + References No definition available. + Details
Name: | dhil_RevenueFromAdministrativeServicesExcludingFinancialActivityNet
Namespace Prefix: | dhil_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Revenue from administrative services net. + References No definition available. + Details
Name: | dhil_RevenueFromAdministrativeServicesNet
Namespace Prefix: | dhil_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Service fees and commission expense payments to third parties. + References No definition available. + Details
Name: | dhil_ServiceFeesAndCommissionExpensePaymentsToThirdParties
Namespace Prefix: | dhil_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Details
Name: | dhil_ShareFinancingAbstract
Namespace Prefix: | dhil_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- 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
Name: | us-gaap_AdministrativeServicesRevenue
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- 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
Name: | us-gaap_FeesAndCommissions
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration