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Significant Accounting Policies - Summary of Assets Under Management Subject to Fees (Details) (USD $) | 12 Months Ended
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Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Assets under management (AUM) subject to incentive fees and the incentive fees |  |  |
Total AUM Subject to Incentive Fees | $ 470,726,000 | $ 274,302,549 | $ 170,432,450
Calendar Quarter-End |  |  |
Assets under management (AUM) subject to incentive fees and the incentive fees |  |  |
Total AUM Subject to Incentive Fees | 0 | 0 | 89,070,421
Calendar Year-End |  |  |
Assets under management (AUM) subject to incentive fees and the incentive fees |  |  |
Total AUM Subject to Incentive Fees | 0 | 0 | 81,362,029
Quarter Ended June 30, 2017 |  |  |
Assets under management (AUM) subject to incentive fees and the incentive fees |  |  |
Total AUM Subject to Incentive Fees | 380,073,000 | 274,302,549 | 0
Quarter Ended December 31, 2018 |  |  |
Assets under management (AUM) subject to incentive fees and the incentive fees |  |  |
Total AUM Subject to Incentive Fees | 90,653,000 | 0 | 0
Incentive Fees Under Method One |  |  |
Assets under management (AUM) subject to incentive fees and the incentive fees |  |  |
Performance Incentive Fees | 0 | 3,301 | 2,597
Incentive Fees Under Method One | Calendar Quarter-End |  |  |
Assets under management (AUM) subject to incentive fees and the incentive fees |  |  |
Performance Incentive Fees | 0 | 0 | 507
Incentive Fees Under Method One | Calendar Year-End |  |  |
Assets under management (AUM) subject to incentive fees and the incentive fees |  |  |
Performance Incentive Fees | 0 | 0 | 2,090
Incentive Fees Under Method One | Quarter Ended June 30, 2017 |  |  |
Assets under management (AUM) subject to incentive fees and the incentive fees |  |  |
Performance Incentive Fees | 0 | 3,301 | 0
Incentive Fees Under Method One | Quarter Ended December 31, 2018 |  |  |
Assets under management (AUM) subject to incentive fees and the incentive fees |  |  |
Performance Incentive Fees | 0 | 0 | 0
Incentive Fees Under Method Two |  |  |
Assets under management (AUM) subject to incentive fees and the incentive fees |  |  |
Performance Incentive Fees | 3,900,649 | 361,700 | 2,597
Incentive Fees Under Method Two | Calendar Quarter-End |  |  |
Assets under management (AUM) subject to incentive fees and the incentive fees |  |  |
Performance Incentive Fees | 0 | 0 | 507
Incentive Fees Under Method Two | Calendar Year-End |  |  |
Assets under management (AUM) subject to incentive fees and the incentive fees |  |  |
Performance Incentive Fees | 0 | 0 | 2,090
Incentive Fees Under Method Two | Quarter Ended June 30, 2017 |  |  |
Assets under management (AUM) subject to incentive fees and the incentive fees |  |  |
Performance Incentive Fees | 3,900,649 | 361,700 | 0
Incentive Fees Under Method Two | Quarter Ended December 31, 2018 |  |  |
Assets under management (AUM) subject to incentive fees and the incentive fees |  |  |
Performance Incentive Fees | $ 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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- Details
Name: | us-gaap_AssetManagementFeesAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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