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Consolidated Statements of Cash Flows (USD $) | 12 Months Ended
--- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
CASH FLOWS FROM OPERATING ACTIVITIES: |  |  |
Net Income | $ 31,580,931 us-gaap_NetIncomeLoss | $ 22,154,828 us-gaap_NetIncomeLoss | $ 16,930,892 us-gaap_NetIncomeLoss
Adjustments to reconcile net income to net cash provided by operating activities: |  |  |
Depreciation | 301,936 us-gaap_Depreciation | 306,005 us-gaap_Depreciation | 305,897 us-gaap_Depreciation
Stock-based compensation | 7,303,799 us-gaap_ShareBasedCompensation | 7,319,401 us-gaap_ShareBasedCompensation | 5,750,981 us-gaap_ShareBasedCompensation
Increase in accounts receivable | (3,511,851)us-gaap_IncreaseDecreaseInAccountsReceivable | (2,563,697)us-gaap_IncreaseDecreaseInAccountsReceivable | (142,875)us-gaap_IncreaseDecreaseInAccountsReceivable
Change in current income taxes | (3,324,298)us-gaap_IncreaseDecreaseInAccruedIncomeTaxesPayable | 8,520,834 us-gaap_IncreaseDecreaseInAccruedIncomeTaxesPayable | (105,166)us-gaap_IncreaseDecreaseInAccruedIncomeTaxesPayable
Change in deferred income taxes | 2,404,433 us-gaap_IncreaseDecreaseInDeferredIncomeTaxes | (5,616,211)us-gaap_IncreaseDecreaseInDeferredIncomeTaxes | (368,572)us-gaap_IncreaseDecreaseInDeferredIncomeTaxes
Net investment gain | (1,517,662)us-gaap_GainLossOnInvestments | (4,270,928)us-gaap_GainLossOnInvestments | (1,135,598)us-gaap_GainLossOnInvestments
Increase in accrued compensation | 8,518,476 us-gaap_IncreaseDecreaseInEmployeeRelatedLiabilities | 8,797,907 us-gaap_IncreaseDecreaseInEmployeeRelatedLiabilities | 5,469,062 us-gaap_IncreaseDecreaseInEmployeeRelatedLiabilities
Excess income tax benefit from stock-based compensation | (666,889)us-gaap_ExcessTaxBenefitFromShareBasedCompensationOperatingActivities | (425,380)us-gaap_ExcessTaxBenefitFromShareBasedCompensationOperatingActivities | (34,543)us-gaap_ExcessTaxBenefitFromShareBasedCompensationOperatingActivities
Income tax benefit from dividends paid on unvested shares | (296,755)dhil_IncomeTaxBenefitFromDividendsPaidOnUnvestedSharesOperatingActivities | (357,188)dhil_IncomeTaxBenefitFromDividendsPaidOnUnvestedSharesOperatingActivities | (1,992,298)dhil_IncomeTaxBenefitFromDividendsPaidOnUnvestedSharesOperatingActivities
Other changes in assets and liabilities | 1,827,723 us-gaap_IncreaseDecreaseInOtherOperatingCapitalNet | 715,570 us-gaap_IncreaseDecreaseInOtherOperatingCapitalNet | (131,087)us-gaap_IncreaseDecreaseInOtherOperatingCapitalNet
Net cash provided by operating activities | 42,619,843 us-gaap_NetCashProvidedByUsedInOperatingActivities | 34,581,141 us-gaap_NetCashProvidedByUsedInOperatingActivities | 24,546,693 us-gaap_NetCashProvidedByUsedInOperatingActivities
CASH FLOWS FROM INVESTING ACTIVITIES: |  |  |
Purchase of property and equipment | (1,504,368)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment | (525,472)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment | (221,592)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
Cost of investments purchased and other portfolio activity | (25,433,201)us-gaap_PaymentsToAcquireInvestments | (2,306,947)us-gaap_PaymentsToAcquireInvestments | (7,463,796)us-gaap_PaymentsToAcquireInvestments
Proceeds from sale of investments | 249,477 us-gaap_ProceedsFromSaleMaturityAndCollectionsOfInvestments | 4,355,536 us-gaap_ProceedsFromSaleMaturityAndCollectionsOfInvestments | 304,152 us-gaap_ProceedsFromSaleMaturityAndCollectionsOfInvestments
Net cash provided by (used in) investing activities | (26,688,092)us-gaap_NetCashProvidedByUsedInInvestingActivities | 1,523,117 us-gaap_NetCashProvidedByUsedInInvestingActivities | (7,381,236)us-gaap_NetCashProvidedByUsedInInvestingActivities
CASH FLOWS FROM FINANCING ACTIVITIES: |  |  |
Value of shares withheld related to employee tax withholding | (976,343)us-gaap_PaymentsRelatedToTaxWithholdingForShareBasedCompensation | (1,884,187)us-gaap_PaymentsRelatedToTaxWithholdingForShareBasedCompensation | (1,348,262)us-gaap_PaymentsRelatedToTaxWithholdingForShareBasedCompensation
Excess income tax benefit from stock-based compensation | 666,889 us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities | 425,380 us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities | 34,543 us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities
Income tax benefit from dividends paid on unvested shares | 296,755 dhil_IncomeTaxBenefitFromDividendsPaidOnUnvestedSharesFinancingActivities | 357,188 dhil_IncomeTaxBenefitFromDividendsPaidOnUnvestedSharesFinancingActivities | 1,992,298 dhil_IncomeTaxBenefitFromDividendsPaidOnUnvestedSharesFinancingActivities
Payment of dividends | (13,248,884)us-gaap_PaymentsOfDividendsCommonStock | (9,766,575)us-gaap_PaymentsOfDividendsCommonStock | (25,215,896)us-gaap_PaymentsOfDividendsCommonStock
Net cash used in financing activities | (13,261,583)us-gaap_NetCashProvidedByUsedInFinancingActivities | (10,868,194)us-gaap_NetCashProvidedByUsedInFinancingActivities | (24,537,317)us-gaap_NetCashProvidedByUsedInFinancingActivities
CASH AND CASH EQUIVALENTS |  |  |
Net change during the year | 2,670,168 us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease | 25,236,064 us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease | (7,371,860)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
At beginning of year | 33,106,972 us-gaap_CashAndCashEquivalentsAtCarryingValue | 7,870,908 us-gaap_CashAndCashEquivalentsAtCarryingValue | 15,242,768 us-gaap_CashAndCashEquivalentsAtCarryingValue
At end of year | 35,777,140 us-gaap_CashAndCashEquivalentsAtCarryingValue | 33,106,972 us-gaap_CashAndCashEquivalentsAtCarryingValue | 7,870,908 us-gaap_CashAndCashEquivalentsAtCarryingValue
Supplemental cash flow information: |  |  |
Interest paid | 0 us-gaap_InterestPaid | 0 us-gaap_InterestPaid | 0 us-gaap_InterestPaid
Income taxes paid | 19,704,817 us-gaap_IncomeTaxesPaid | 10,575,000 us-gaap_IncomeTaxesPaid | 9,636,000 us-gaap_IncomeTaxesPaid
Supplemental disclosure of non-cash transactions: |  |  |
Grant Date Value | $ 3,984,816 us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation | $ 4,606,008 us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation | $ 5,540,792 us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation

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- Definition Amount of cash outflow in the form of ordinary dividends to common shareholders of the parent entity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3291-108585 + Details
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- Definition Amount of cash outflow to satisfy an employee's income tax withholding obligation as part of a net-share settlement of a share-based award. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3291-108585 + Details
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- Definition The cash outflow associated with the purchase of all investments (debt, security, other) during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3213-108585 + Details
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- Definition The cash outflow associated with the acquisition of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale; includes cash outflows to pay for construction of self-constructed assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3213-108585 + Details
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- Definition The cash inflow associated with the sale, maturity and collection of all investments such as debt, security and so forth during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3179-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 + Details
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- Definition The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 + Details
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- Definition Value of stock (or other type of equity) issued during the period as a result of any equity-based compensation plan other than an employee stock ownership plan (ESOP), net of stock value of such awards forfeited. Stock issued could result from the issuance of restricted stock, the exercise of stock options, stock issued under employee stock purchase plans, and/or other employee benefit plans. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29, 30, 31 -Article 5 + Details
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