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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

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- 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

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

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- Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration