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Significant Accounting Policies - Schedule of Fee by Series and Share Class (Details)	Dec. 31, 2014
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

X

- Definition

Rate of administrative service fees.

+ References

No definition available.

+ Details

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Namespace Prefix:	dhil_
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Balance Type:	na
Period Type:	instant

X

- Details

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X

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	dhil_RevenueRecognitionSeriesAndShareClassAxis=dhil_ClassYMember
Namespace Prefix:
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Balance Type:
Period Type: