XML 71 R48.htm IDEA: XBRL DOCUMENT
v3.24.0.1

Operating Leases - Textual (Details) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 USD ($) ft² Location | Dec. 31, 2022 USD ($) | Dec. 31, 2021 USD ($)
Leases [Abstract] |  |  |
Lessee leasing agreements, operating leases, area under lease (in sqft) | ft² | 37,829 |  |
Number of office space locations | Location | 1 |  |
Operating Lease, Right-of-Use Asset | $ 0.6 | $ 1.1 |
Operating Lease, Liability | 0.8 | 1.4 |
Operating lease expense excluding rent | $ 0.4 | $ 0.4 | $ 0.4
Operating Lease, Liability, Statement of Financial Position [Extensible Enumeration] | Accounts Payable and Accrued Liabilities | Accounts Payable and Accrued Liabilities |
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration] | Property, Plant and Equipment, Net | Property, Plant and Equipment, Net |

X
- Definition Lessee Leasing Agreements, Operating Leases, Area under Lease + References No definition available. + Details
Name: | dhil_LesseeLeasingAgreementsOperatingLeasesAreaunderLease
Namespace Prefix: | dhil_
Data Type: | dtr-types1:areaItemType
Balance Type: | na
Period Type: | duration

X
- Definition Operating Lease Expense Excluding Rent + References No definition available. + Details
Name: | dhil_OperatingLeaseExpenseExcludingRent
Namespace Prefix: | dhil_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_LeasesAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Present value of lessee's discounted obligation for lease payments from operating lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 842 -SubTopic 20 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479041/842-20-45-1 + Details
Name: | us-gaap_OperatingLeaseLiability
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Indicates line item in statement of financial position that includes operating lease liability. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 842 -SubTopic 20 -Name Accounting Standards Codification -Section 45 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479041/842-20-45-2 + Details
Name: | us-gaap_OperatingLeaseLiabilityStatementOfFinancialPositionExtensibleList
Namespace Prefix: | us-gaap_
Data Type: | enum2:enumerationSetItemType
Balance Type: | na
Period Type: | instant

X
- Definition Amount of lessee's right to use underlying asset under operating lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 842 -SubTopic 20 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479041/842-20-45-1 + Details
Name: | us-gaap_OperatingLeaseRightOfUseAsset
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Indicates line item in statement of financial position that includes operating lease right-of-use asset. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 842 -SubTopic 20 -Name Accounting Standards Codification -Section 45 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479041/842-20-45-2 + Details
Name: | us-gaap_OperatingLeaseRightOfUseAssetStatementOfFinancialPositionExtensibleList
Namespace Prefix: | us-gaap_
Data Type: | enum2:enumerationSetItemType
Balance Type: | na
Period Type: | instant

X
- Definition The number of units (items of property) under operating lease arrangements. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 842 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 13 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479773/842-30-50-13 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 360 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482099/360-10-50-1 + Details
Name: | us-gaap_PropertySubjectToOrAvailableForOperatingLeaseNumberOfUnits
Namespace Prefix: | us-gaap_
Data Type: | xbrli:decimalItemType
Balance Type: | na
Period Type: | instant