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Stock-Based Compensation - Summary of Deferred Compensation Expense Recognition (Details) (Restricted Stock Units (RSUs), USD $)	Dec. 31, 2014
Restricted Stock Units (RSUs)
Expense recognition of deferred compensation
2015	$ 5,723,105dhil_EmployeeServiceShareBasedCompensationNonvestedAwardsCompensationCostNotYetRecognizedInYearOne / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember
2016	2,708,516dhil_EmployeeServiceShareBasedCompensationNonvestedAwardsCompensationCostNotYetRecognizedInYearTwo / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember
2017	2,180,245dhil_EmployeeServiceShareBasedCompensationNonvestedAwardsCompensationCostNotYetRecognizedInYearThree / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember
2018	1,436,301dhil_EmployeeServiceShareBasedCompensationNonvestedAwardsCompensationCostNotYetRecognizedInYearFour / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember
2019	517,966dhil_EmployeeServiceShareBasedCompensationNonvestedAwardsCompensationCostNotYetRecognizedInYearFive / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember
Total	$ 12,566,133us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember

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- Definition

Employee service share based compensation nonvested awards compensation cost not yet recognized in year five.

+ References

No definition available.

+ Details

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- Definition

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+ References

No definition available.

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- Definition

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+ References

No definition available.

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- Definition

Employee service share based compensation nonvested awards compensation cost not yet recognized in year three.

+ References

No definition available.

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- Definition

Employee service share based compensation nonvested awards compensation cost not yet recognized in year two.

+ References

No definition available.

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- Definition

Unrecognized cost of unvested share-based compensation awards.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (i)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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