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Compensation Plans - Expense Recognition of Deferred Compensation (Detail) (Restricted Stock Units (RSUs), USD $) | Mar. 31, 2015
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Restricted Stock Units (RSUs) |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
2015 (Remaining Period) | $ 5,056,315 dhil_EmployeeServiceShareBasedCompensationNonvestedAwardsCompensationCostNotYetRecognizedCurrent / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember
2016 | 4,076,780 dhil_EmployeeServiceShareBasedCompensationNonvestedAwardsCompensationCostNotYetRecognizedInYearOne / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember
2017 | 3,548,508 dhil_EmployeeServiceShareBasedCompensationNonvestedAwardsCompensationCostNotYetRecognizedInYearTwo / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember
2018 | 2,845,415 dhil_EmployeeServiceShareBasedCompensationNonvestedAwardsCompensationCostNotYetRecognizedInYearThree / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember
2019 | 1,940,697 dhil_EmployeeServiceShareBasedCompensationNonvestedAwardsCompensationCostNotYetRecognizedInYearFour / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember
Thereafter | 918,563 dhil_EmployeeServiceShareBasedCompensationNonvestedAwardsCompensationCostNotYetRecognizedInYearFive / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember
Total | $ 18,386,278 us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember

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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 + Details
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