XML 21 R29.htm IDEA: XBRL DOCUMENT
v2.4.0.8

Investment Portfolio - Carrying Value and Income from Partnerships (Detail) (USD $) | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2014 | Dec. 31, 2013
Investments, Debt and Equity Securities [Abstract] |  |
Total partnership assets | $ 117,216,278 | $ 122,106,403
Total partnership liabilities | 22,482,499 | 25,217,600
Net partnership assets | 94,733,779 | 96,888,803
DHCM’s portion of net assets | 4,742,369 | 3,001,461
Net partnership income | 7,653,524 | 24,294,495
DHCM’s portion of net income | $ 315,908 | $ 899,958

X
- Definition Net partnership assets. + References No definition available. + Details
Name: | dhil_NetPartnershipAssets
Namespace Prefix: | dhil_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Net partnership income. + References No definition available. + Details
Name: | dhil_NetPartnershipIncome
Namespace Prefix: | dhil_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Partnership assets. + References No definition available. + Details
Name: | dhil_PartnershipAssets
Namespace Prefix: | dhil_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Partnership liabilities. + References No definition available. + Details
Name: | dhil_PartnershipLiabilities
Namespace Prefix: | dhil_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Portion in net partnership income. + References No definition available. + Details
Name: | dhil_PortionInNetPartnershipIncome
Namespace Prefix: | dhil_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Portion of net partnership assets. + References No definition available. + Details
Name: | dhil_PortionOfNetPartnershipAssets
Namespace Prefix: | dhil_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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