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Significant Accounting Policies (Details 1) (USD $) | 12 Months Ended
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Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Assets under management (AUM) subject to incentive fees and the incentive fees |  |  |
Total AUM Subject to Incentive Fees | $ 274,302,549 | $ 170,432,450 | $ 283,903,741
Calendar Quarter-End [Member] |  |  |
Assets under management (AUM) subject to incentive fees and the incentive fees |  |  |
Total AUM Subject to Incentive Fees |  | 89,070,421 | 108,671,900
Calendar Year-End [Member] |  |  |
Assets under management (AUM) subject to incentive fees and the incentive fees |  |  |
Total AUM Subject to Incentive Fees |  | 81,362,029 | 175,231,841
May 31, 2017 [Member] |  |  |
Assets under management (AUM) subject to incentive fees and the incentive fees |  |  |
Total AUM Subject to Incentive Fees | 274,302,549 |  |
Incentive Fees Under Method 1 [Member] |  |  |
Assets under management (AUM) subject to incentive fees and the incentive fees |  |  |
Performance Incentive Fees | 3,301 | 2,597 | 217,588
Incentive Fees Under Method 1 [Member] | Calendar Quarter-End [Member] |  |  |
Assets under management (AUM) subject to incentive fees and the incentive fees |  |  |
Performance Incentive Fees |  | 507 | 13,214
Incentive Fees Under Method 1 [Member] | Calendar Year-End [Member] |  |  |
Assets under management (AUM) subject to incentive fees and the incentive fees |  |  |
Performance Incentive Fees |  | 2,090 | 204,374
Incentive Fees Under Method 1 [Member] | May 31, 2017 [Member] |  |  |
Assets under management (AUM) subject to incentive fees and the incentive fees |  |  |
Performance Incentive Fees | 3,301 |  |
Incentive Fees Under Method 2 [Member] |  |  |
Assets under management (AUM) subject to incentive fees and the incentive fees |  |  |
Performance Incentive Fees | 361,700 | 2,597 | 217,588
Incentive Fees Under Method 2 [Member] | Calendar Quarter-End [Member] |  |  |
Assets under management (AUM) subject to incentive fees and the incentive fees |  |  |
Performance Incentive Fees |  | 507 | 13,214
Incentive Fees Under Method 2 [Member] | Calendar Year-End [Member] |  |  |
Assets under management (AUM) subject to incentive fees and the incentive fees |  |  |
Performance Incentive Fees |  | 2,090 | 204,374
Incentive Fees Under Method 2 [Member] | May 31, 2017 [Member] |  |  |
Assets under management (AUM) subject to incentive fees and the incentive fees |  |  |
Performance Incentive Fees | $ 361,700 |  |

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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 revenues earned by the entity based on the investment results achieved, including, but not limited to, revenues related to management of investment fund assets. Excludes fees based upon a percentage of the assets under management, which are not performance-related fees. + 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