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Significant Accounting Policies - Schedule of Fee by Series and Share Class (Details) | Dec. 31, 2014
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Class A, C, and I Shares |
Revenue Recognition Principal Transaction [Line Items] |
Rate of Administrative Service Fees | 0.25%dhil_RateOfAdministrativeServiceFees / dhil_RevenueRecognitionSeriesAndShareClassAxis = dhil_ClassACandISharesMember
Class Y |
Revenue Recognition Principal Transaction [Line Items] |
Rate of Administrative Service Fees | 0.10%dhil_RateOfAdministrativeServiceFees / dhil_RevenueRecognitionSeriesAndShareClassAxis = dhil_ClassYMember

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- Definition Rate of administrative service fees. + References No definition available. + Details
Name: | dhil_RateOfAdministrativeServiceFees
Namespace Prefix: | dhil_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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

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- Details
Name: | dhil_RevenueRecognitionSeriesAndShareClassAxis=dhil_ClassACandISharesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | dhil_RevenueRecognitionSeriesAndShareClassAxis=dhil_ClassYMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |