XML 58 R46.htm IDEA: XBRL DOCUMENT
v3.21.1

Sale of Assets of Diamond Hill's High Yield-Focused Fund (Details) - Disposal Group, Disposed of by Sale, Not Discontinued Operations - Acquired Funds $ in Millions | Feb. 02, 2021 USD ($) payment
--- | ---
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |
Consideration transferred | $ 9.0
Number of additional payments | payment | 2
Additional consideration | $ 13.0
Additional consideration, term | 1 year

X
- Definition Disposal Group, Including Discontinued Operation, Additional Consideration + References No definition available. + Details
Name: | dhil_DisposalGroupIncludingDiscontinuedOperationAdditionalConsideration
Namespace Prefix: | dhil_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Disposal Group, Including Discontinued Operation, Additional Consideration, Term + References No definition available. + Details
Name: | dhil_DisposalGroupIncludingDiscontinuedOperationAdditionalConsiderationTerm
Namespace Prefix: | dhil_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Disposal Group, Including Discontinued Operation, Number Of Additional Payments + References No definition available. + Details
Name: | dhil_DisposalGroupIncludingDiscontinuedOperationNumberOfAdditionalPayments
Namespace Prefix: | dhil_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Amount of consideration received or receivable for the disposal of assets and liabilities, including discontinued operation. + References No definition available. + Details
Name: | us-gaap_DisposalGroupIncludingDiscontinuedOperationConsideration
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_DisposalGroupClassificationAxis=us-gaap_DisposalGroupDisposedOfBySaleNotDiscontinuedOperationsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis=dhil_AcquiredFundsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |