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Income Taxes - Schedule of Deferred Tax Assets and Liabilities (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013
Summary of Deferred tax assets and liabilities
Stock-based compensation	$ 5,433,419us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost	$ 4,433,293us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost
Accrued incentive compensation	2,964,688us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefits	4,075,735us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefits
Unrealized (gains) losses	(2,436,006)dhil_DeferredTaxAssetsUnrealizedGainLossOnTradingSecurities	(316,926)dhil_DeferredTaxAssetsUnrealizedGainLossOnTradingSecurities
Other assets and liabilities	(303,109)dhil_DeferredTaxAssetsLiabilitiesOther	(128,677)dhil_DeferredTaxAssetsLiabilitiesOther
Net deferred tax assets	$ 5,658,992us-gaap_DeferredTaxAssetsLiabilitiesNet	$ 8,063,425us-gaap_DeferredTaxAssetsLiabilitiesNet

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- Definition

Deferred tax assets (liabilities) other.

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- Definition

Deferred tax assets unrealized gain loss on trading securities.

+ References

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- Definition

Amount after allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and carryforwards, net of deferred tax liability attributable to taxable temporary differences.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 740

-SubTopic 10

-Section 50

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32537-109319

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- Definition

Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from compensation and benefits costs.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 740

-SubTopic 10

-Section 50

-Paragraph 6

-URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32621-109319



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-Publisher FASB

-Name Accounting Standards Codification

-Topic 740

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-Section 50

-Paragraph 8

-URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32632-109319



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 740

-SubTopic 10

-Section 25

-Paragraph 20

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=29652012&loc=d3e28680-109314

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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from share-based compensation.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 740

-SubTopic 10

-Section 50

-Paragraph 6

-URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32621-109319



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-URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32632-109319



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-Publisher FASB

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-Topic 740

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-Section 25

-Paragraph 20

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-URI http://asc.fasb.org/extlink&oid=29652012&loc=d3e28680-109314

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