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Significant Accounting Policies - Assets under Management (AUM) Subject to Incentive Fees and Incentive Fees (Detail) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Principal Transaction Revenue [Line Items]
AUM Subject to Incentive Fees	$ 498,891,932	$ 331,253,656	$ 498,891,932	$ 331,253,656
Quarter Ended June 30, 2017
Principal Transaction Revenue [Line Items]
AUM Subject to Incentive Fees	402,429,364	331,253,656	402,429,364	331,253,656
Quarter Ended December 31, 2018
Principal Transaction Revenue [Line Items]
AUM Subject to Incentive Fees	96,462,568	0	96,462,568	0
Incentive Fees Under Method 1
Principal Transaction Revenue [Line Items]
Performance Incentive Fees	0	0	0	0
Incentive Fees Under Method 1 | Quarter Ended June 30, 2017
Principal Transaction Revenue [Line Items]
Performance Incentive Fees	0	0	0	0
Incentive Fees Under Method 1 | Quarter Ended December 31, 2018
Principal Transaction Revenue [Line Items]
Performance Incentive Fees	0	0	0	0
Incentive Fees Under Method 2
Principal Transaction Revenue [Line Items]
Performance Incentive Fees	3,614,204	2,464,815	3,614,204	2,464,815
Incentive Fees Under Method 2 | Quarter Ended June 30, 2017
Principal Transaction Revenue [Line Items]
Performance Incentive Fees	3,614,204	2,464,815	3,614,204	2,464,815
Incentive Fees Under Method 2 | Quarter Ended December 31, 2018
Principal Transaction Revenue [Line Items]
Performance Incentive Fees	$ 0	$ 0	$ 0	$ 0

X

- Definition

Assets under management (AUM) subject to incentive fees and incentive fees.

+ References

No definition available.

+ Details

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Namespace Prefix:	dhil_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Amount of revenue earned by the entity based on the investment results achieved. Excludes fees based upon a percentage of the assets under management not performance-related.

+ 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 (a))

-URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882

+ Details

Name:	us-gaap_PerformanceFees
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Details

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