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Significant Accounting Policies - Compensation for Mutual Fund Administration, Transfer Agency and Other Related Functions (Detail)	Feb. 29, 2012	Feb. 28, 2012
Class A and Class C [Member]
Principal Transaction Revenue [Line Items]
Rate of Administrative Service Fees	0.25%	0.26%
Class I [Member]
Principal Transaction Revenue [Line Items]
Rate of Administrative Service Fees	0.25%	0.24%
Class Y [Member]
Principal Transaction Revenue [Line Items]
Rate of Administrative Service Fees	0.10%	0.10%

X

- 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

X

- Details

Name:	us-gaap_PrincipleTransactionRevenueLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration