Class Y Diamond Hill Select Fund Class Y Diamond Hill Select Fund Class Y Management Risk Member Management Risk Member Management Risk Member Government Securities Risk Member Government Securities Risk Member Government Securities Risk Member Caption Average Annual Return, Caption Small Number Of Holdings Risk Member Small Number Of Holdings Risk Member Small Number Of Holdings Risk Member Strategy Narrative [Text Block] Strategy Narrative [Text Block] Class I Diamond Hill Small Cap Fund Class I Diamond Hill Small Cap Fund Class I, C000008532 Share Classes Share Classes Performance Additional Market Index [Text] Performance Additional Market Index [Text] Annual Return, Inception Date Annual Return, Inception Date Annual Return 2005 Annual Return 2005 Expense Example by Year [Heading] Expense Example by Year [Heading] Annual Return 2006 Annual Return 2006 Annual Return 2003 Annual Return 2003 Prepayment And Call Risk Member Prepayment And Call Risk Member Prepayment And Call Risk Member Annual Return 2004 Annual Return 2004 Annual Return 2009 Annual Return 2009 Class Y Diamond Hill Core Bond Fund Class Y Diamond Hill Core Bond Fund Class Y, C000173088 Document Effective Date Document Effective Date Annual Return 2007 Annual Return 2007 Annual Return 2008 Annual Return 2008 Illiquid Securities Risk Member Illiquid Securities Risk Member Illiquid Securities Risk Member Performance Table Footnotes, Reason Performance Information for Class Different from Immediately Preceding Period [Text] Performance Table Footnotes, Reason Performance Information for Class Different from Immediately Preceding Period [Text] Objective, Primary [Text Block] Objective, Primary [Text Block] Performance Table Heading Performance Table Heading Portfolio Turnover [Heading] Portfolio Turnover [Heading] Expense Example, No Redemption, By Year, Caption [Text] Expense Example, No Redemption, By Year, Caption [Text] Component1 Other Expenses Component1 Other Expenses Diamond Hill Small-Mid Cap Fund Diamond Hill Small-Mid Cap Fund Diamond Hill Small-Mid Cap Fund, S000012190 Maximum Account Fee Maximum Account Fee Shareholder Fee, Other Shareholder Fee, Other Small-Cap Stock Risk Member Small-Cap Stock Risk Member Small-Cap Stock Risk Member Expenses Range of Exchange Fees [Text Block] Expenses Range of Exchange Fees [Text Block] After Taxes on Distributions After Taxes on Distributions Annual Return 2001 Annual Return 2001 Highest Quarterly Return Highest Quarterly Return Annual Return 2002 Annual Return 2002 Class I Diamond Hill Long-Short Fund Class I Diamond Hill Long-Short Fund Class I, C000008538 Annual Return 2000 Annual Return 2000 Annual Return 2016 Annual Return 2016 Annual Return 2017 Annual Return 2017 Annual Return 2014 Annual Return 2014 Main Risk Member Main Risk Member Main Risk Member Annual Return 2015 Annual Return 2015 Expense Example by, Year, Caption [Text] Expense Example by, Year, Caption [Text] Russell 2000 Index Russell 2000 Index Russell 2000 Index Annual Return 2018 Annual Return 2018 Annual Return 2019 Annual Return 2019 Management Fees (as a percentage of Assets) Management Fees (as a percentage of Assets) Shareholder Fees [Table] Shareholder Fees [Table] Performance Table Does Reflect Sales Loads Performance Table Does Reflect Sales Loads Diamond Hill Select Fund Diamond Hill Select Fund Diamond Hill Select Fund, S000012191 Annual Return 2012 Annual Return 2012 Shareholder Fees Column [Text] Shareholder Fees Column [Text] Annual Return 2013 Annual Return 2013 Fee Waiver or Reimbursement over Assets, Date of Termination Fee Waiver or Reimbursement over Assets, Date of Termination Exchange Fee Exchange Fee Bar Chart, Year to Date Return, Date Bar Chart, Year to Date Return, Date Annual Return 2010 Annual Return 2010 Annual Return 2011 Annual Return 2011 Foreign Risk Member Foreign Risk Member Foreign Risk Member Russell 3000 Index Russell 3000 Index Russell 3000 Index Class I Diamond Hill Large Cap Concentrated Fund Class I C000227096 Diamond Hill Large Cap Concentrated Fund Class I DHFIX Class Y Diamond Hill Mid Cap Fund Class Y Diamond Hill Mid Cap Fund Class Y, C000134910 Trading Symbol Trading Symbol Risk Nondiversified Status [Member] Risk Nondiversified Status [Member] Risk Footnotes [Text Block] Risk Footnotes [Text Block] Diamond Hill Core Plus Bond Fund Diamond Hill Core Plus Bond Fund Diamond Hill Core Plus Bond Fund Document Creation Date Document Creation Date Diamond Hill Small Cap Fund Diamond Hill Small Cap Fund Diamond Hill Small Cap Fund, S000003154 Operating Expenses Column [Text] Operating Expenses Column [Text] Maximum Deferred Sales Charge (as a percentage) Maximum Deferred Sales Charge (as a percentage) Document [Axis] Document [Axis] Single Country Risk Member Single Country Risk Member Single Country Risk Member Bar Chart, Returns for Class Not Offered in Prospectus [Text] Bar Chart, Returns for Class Not Offered in Prospectus [Text] Annual Return 2020 Annual Return 2020 Inception Date Inception Date Annual Return 2023 Annual Return 2023 Annual Return 2024 Annual Return 2024 Column Average Annual Return, Column Name Annual Return 2021 Annual Return 2021 Loan Risk Member Loan Risk Member Loan Risk Member Investor Diamond Hill Select Fund Class Investor Diamond Hill Select Fund Class Investor, C000033259 Annual Return 2022 Annual Return 2022 Performance Table Footnotes Performance Table Footnotes Small Cap Company Risk Member Small Cap Company Risk Member Small Cap Company Risk Member Redemption Fee Redemption Fee Bar Chart Footnotes [Text Block] Bar Chart Footnotes [Text Block] Investor Diamond Hill Large Cap Concentrated Fund Class Investor C000227095 Diamond Hill Large Cap Concentrated Fund Class Investor DHFAX Non-U.S. And Emerging Markets Risk Member Non-U.S. And Emerging Markets Risk Member Non-U.S. And Emerging Markets Risk Member Class I Diamond Hill Core Bond Fund Class I Diamond Hill Core Bond Fund Class I, C000173087 Maximum Cumulative Sales Charge (as a percentage) Maximum Cumulative Sales Charge (as a percentage) Lowest Quarterly Return, Label Lowest Quarterly Return, Label Before Taxes Before Taxes Risk Closing [Text Block] Risk Closing [Text Block] Diamond Hill Core Bond Fund Diamond Hill Core Bond Fund Diamond Hill Core Bond Fund, S000055044 Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) Bloomberg US Aggregate Bond Index Bloomberg US Aggregate Bond Index Bloomberg US Aggregate Bond Index Strategy Portfolio Concentration [Text] Strategy Portfolio Concentration [Text] Annual Return 1994 Annual Return 1994 Annual Return 1995 Annual Return 1995 Benchmark Correlation Risk Member Benchmark Correlation Risk Member Benchmark Correlation Risk Member Annual Return 1992 Annual Return 1992 Annual Return 1993 Annual Return 1993 Annual Return 1998 Annual Return 1998 Expenses Other Expenses Had Extraordinary Expenses Been Included [Text] Expenses Other Expenses Had Extraordinary Expenses Been Included [Text] Annual Return 1999 Annual Return 1999 Annual Return 1996 Annual Return 1996 Annual Return 1997 Annual Return 1997 Morningstar Global Markets ex-US Index Morningstar Global Markets ex-US Index Morningstar Global Markets ex-US Index Expenses Restated to Reflect Current [Text] Expenses Restated to Reflect Current [Text] Bar Chart Closing [Text Block] Bar Chart Closing [Text Block] Class Y Diamond Hill Large Cap Fund Class Y Diamond Hill Large Cap Fund Class Y, C000108464 Thirty Day Yield Column [Text] Thirty Day Yield Column [Text] Acquired Fund Fees and Expenses Acquired Fund Fees and Expenses Investor Diamond Hill Mid Cap Fund Class Investor Diamond Hill Mid Cap Fund Class Investor, C000134907 Risk/Return [Heading] Risk/Return [Heading] Thirty Day Yield Caption Thirty Day Yield Caption Money Market Seven Day Yield Money Market Seven Day Yield Style Risk Member Style Risk Member Style Risk Member Annual Return 1990 Annual Return 1990 Annual Return 1991 Annual Return 1991 Real Estate Risk Member Real Estate Risk Member Real Estate Risk Member Distribution or Similar (Non 12b-1) Fees Distribution or Similar (Non 12b-1) Fees Risk Caption Risk Caption Class I Diamond Hill Select Fund Class I Diamond Hill Select Fund Class I, C000033261 Class Y Diamond Hill Small Cap Fund Class Y Diamond Hill Small Cap Fund Class Y, C000108463 Frontier Emerging Markets Risk Member Frontier Emerging Markets Risk Member Frontier Emerging Markets Risk Member Expense Example, With Redemption [Table] Expense Example, With Redemption [Table] Small Cap And Mid Cap Company Risk Member Small Cap And Mid Cap Company Risk Member Small Cap And Mid Cap Company Risk Member Component3 Other Expenses Component3 Other Expenses Other Expenses, New Fund, Based on Estimates [Text] Other Expenses, New Fund, Based on Estimates [Text] High Yield Securities Risk Member High Yield Securities Risk Member High Yield Securities Risk Member Expense Breakpoint Discounts [Text] Expense Breakpoint Discounts [Text] Index No Deduction for Fees, Expenses, Taxes [Text] Index No Deduction for Fees, Expenses, Taxes [Text] Expenses Represent Both Master and Feeder [Text] Expenses Represent Both Master and Feeder [Text] Class I Diamond Hill Mid Cap Fund Class I Diamond Hill Mid Cap Fund Class I, C000134909 Price Volatility Risk Member Price Volatility Risk Member Price Volatility Risk Member Maximum Deferred Sales Charge (as a percentage of Offering Price) Maximum Deferred Sales Charge (as a percentage of Offering Price) Interest Rate Risk Member Interest Rate Risk Member Interest Rate Risk Member Annual Return, Column [Text] Annual Return, Column [Text] Performance Past Does Not Indicate Future [Text] Performance Past Does Not Indicate Future [Text] Exchange Fee (as a percentage of Amount Redeemed) Exchange Fee (as a percentage of Amount Redeemed) Redemption Risk Member Redemption Risk Member Redemption Risk Member Emerging Markets Risk Member Emerging Markets Risk Member Emerging Markets Risk Member Share Class [Axis] Share Class [Axis] Performance Table Closing [Text Block] Performance Table Closing [Text Block] Investor Diamond Hill Large Cap Fund Class Investor Diamond Hill Large Cap Fund Class Investor, C000008533 Investor Diamond Hill Small-Mid Cap Fund Class Investor Diamond Hill Small-Mid Cap Fund Class Investor, C000033256 Operating Expenses Caption [Text] Operating Expenses Caption [Text] Current Market Environment Risk Member Current Market Environment Risk Member Current Market Environment Risk Member Maximum Account Fee (as a percentage of Assets) Maximum Account Fee (as a percentage of Assets) Annual Fund Operating Expenses [Table] Annual Fund Operating Expenses [Table] Performance Narrative [Text Block] Performance Narrative [Text Block] Money Market Seven Day Yield, Caption [Text] Money Market Seven Day Yield, Caption [Text] Performance Table Market Index Changed Performance Table Market Index Changed Entity Inv Company Type Entity Inv Company Type REITs Risk Member REITs Risk Member REITs Risk Member Expense Example, No Redemption, 10 Years Expense Example, No Redemption, 10 Years Class I Diamond Hill Large Cap Fund Class I Diamond Hill Large Cap Fund Class I, C000008535 Thirty Day Tax Equivalent Yield Thirty Day Tax Equivalent Yield Redemption Fee (as a percentage of Amount Redeemed) Redemption Fee (as a percentage of Amount Redeemed) Market Index Performance [Table] Market Index Performance [Table] Financial Sector Risk Member Financial Sector Risk Member Financial Sector Risk Member Diamond Hill Long-Short Fund Diamond Hill Long-Short Fund Diamond Hill Long-Short Fund, S000003156 1 Year 1 Year Lowest Quarterly Return Lowest Quarterly Return Expense Example, No Redemption, 5 Years Expense Example, No Redemption, 5 Years 5 Years 5 Years Class Y Diamond Hill Long-Short Fund Class Y Diamond Hill Long-Short Fund Class Y, C000108465 Thirty Day Yield Thirty Day Yield Prospectus Prospectus Other Expenses (as a percentage of Assets): Other Expenses (as a percentage of Assets): Risk [Text Block] Risk [Text Block] After Taxes on Distributions and Sales After Taxes on Distributions and Sales MSCI ACWI ex USA Index MSCI ACWI ex USA Index MSCI ACWI ex USA Index Expense Narrative [Text Block] Expense Narrative [Text Block] Prospectus [Line Items] Prospectus [Line Items] Performance Measure [Axis] Performance Measure [Axis] Maximum Cumulative Sales Charge (as a percentage of Offering Price) Maximum Cumulative Sales Charge (as a percentage of Offering Price) Component2 Other Expenses Component2 Other Expenses Growth Stocks Risk Member Growth Stocks Risk Member Growth Stocks Risk Member Diamond Hill Mid Cap Fund Diamond Hill Mid Cap Fund Diamond Hill Mid Cap Fund, S000043502 Class Y Diamond Hill Large Cap Concentrated Fund Class Y C000227094 Diamond Hill Large Cap Concentrated Fund Class Y DHFYX 10 Years 10 Years Market Risk Member Market Risk Member Market Risk Member Document Type Document Type Risk Not Insured Depository Institution [Member] Risk Not Insured Depository Institution [Member] Depositary Receipts Risk Member Depositary Receipts Risk Member Depositary Receipts Risk Member Strategy [Heading] Strategy [Heading] Russell Midcap Index Russell Midcap Index Russell Midcap Index Investor Diamond Hill Core Plus Bond Fund Class Investor Diamond Hill Core Plus Bond Fund Class Investor Class Y Diamond Hill Short Duration Securitized Bond Fund Class Y Diamond Hill Short Duration Securitized Bond Fund Class Y, C000173085 Registrant Name Registrant Name Russell 1000 Index Russell 1000 Index Russell 1000 Index Bar Chart Does Not Reflect Sales Loads [Text] Bar Chart Does Not Reflect Sales Loads [Text] Diamond Hill Short Duration Securitized Bond Fund Diamond Hill Short Duration Securitized Bond Fund Diamond Hill Short Duration Securitized Bond Fund, S000055043 Net Expenses (as a percentage of Assets) Net Expenses (as a percentage of Assets) Risk Lose Money [Member] Risk Lose Money [Member] Class I Diamond Hill Small-Mid Cap Fund Class I Diamond Hill Small-Mid Cap Fund Class I, C000033258 Performance Table Not Relevant to Tax Deferred Performance Table Not Relevant to Tax Deferred Investor Diamond Hill Small Cap Fund Class Investor Diamond Hill Small Cap Fund Class Investor, C000008530 Distribution and Service (12b-1) Fees Distribution and Service (12b-1) Fees Performance [Table] Performance [Table] Document Period End Date Document Period End Date Diamond Hill Large Cap Concentrated Fund Diamond Hill Large Cap Concentrated Fund S000071665 Diamond Hill Large Cap Concentrated Fund Performance Information Illustrates Variability of Returns [Text] Performance Information Illustrates Variability of Returns [Text] Expense Example, with Redemption, 5 Years Expense Example, with Redemption, 5 Years Central Index Key Entity Central Index Key Expense Example, with Redemption, 3 Years Expense Example, with Redemption, 3 Years Extension Risk Member Extension Risk Member Extension Risk Member Expense Example, with Redemption, 1 Year Expense Example, with Redemption, 1 Year Expenses Deferred Charges [Text Block] Expenses Deferred Charges [Text Block] Investor Diamond Hill Core Bond Fund Class Investor Diamond Hill Core Bond Fund Class Investor, C000173086 Risk [Axis] Risk [Axis] Portfolio Turnover [Text Block] Portfolio Turnover [Text Block] Portfolio Turnover, Rate Portfolio Turnover, Rate Investor Diamond Hill Long-Short Fund Class Investor Diamond Hill Long-Short Fund Class Investor, C000008536 Year to Date Return, Label Year to Date Return, Label Short Sale Risk Member Short Sale Risk Member Short Sale Risk Member Collateralized Loan Obligations ("CLOs") Risk Member Collateralized Loan Obligations ("CLOs") Risk Member Collateralized Loan Obligations ("CLOs") Risk Member Liquidity Risk Member Liquidity Risk Member Liquidity Risk Member Expense Example Narrative [Text Block] Expense Example Narrative [Text Block] Expense Example, with Redemption, 10 Years Expense Example, with Redemption, 10 Years Diamond Hill International Fund Diamond Hill International Fund Diamond Hill International Fund, S000065011 All Risks [Member] All Risks [Member] Series Series Amendment Flag Amendment Flag Money Market Seven Day Yield Phone Money Market Seven Day Yield Phone Acquired Fund Fees and Expenses, Based on Estimates [Text] Acquired Fund Fees and Expenses, Based on Estimates [Text] Series [Axis] Series [Axis] Expense Example [Heading] Expense Example [Heading] Asset-Backed, Mortgage-Related And Mortgage-Backed Securities Risk Member Asset-Backed, Mortgage-Related And Mortgage-Backed Securities Risk Member Asset-Backed, Mortgage-Related And Mortgage-Backed Securities Risk Member Risk [Heading] Risk [Heading] Expense Example, No Redemption Narrative [Text Block] Expense Example, No Redemption Narrative [Text Block] Thirty Day Yield Phone Thirty Day Yield Phone Inflation Risk Member Inflation Risk Member Inflation Risk Member Performance Table Uses Highest Federal Rate Performance Table Uses Highest Federal Rate Money Market Seven Day Yield Column [Text] Money Market Seven Day Yield Column [Text] Bar Chart and Performance Table [Heading] Bar Chart and Performance Table [Heading] Credit Risk Member Credit Risk Member Credit Risk Member ESG Integration Risk Member ESG Integration Risk Member ESG Integration Risk Member Shareholder Fees Caption [Text] Shareholder Fees Caption [Text] Currency Risk Member Currency Risk Member Currency Risk Member Risk Not Insured [Member] Risk Not Insured [Member] Expense Footnotes [Text Block] Expense Footnotes [Text Block] Performance Table One Class of after Tax Shown [Text] Performance Table One Class of after Tax Shown [Text] Maximum Sales Charge on Reinvested Dividends and Distributions (as a percentage) Maximum Sales Charge on Reinvested Dividends and Distributions (as a percentage) Money Market Seven Day Tax Equivalent Yield Money Market Seven Day Tax Equivalent Yield Fee Waiver or Reimbursement Fee Waiver or Reimbursement Class I Diamond Hill Short Duration Securitized Bond Fund Class I Diamond Hill Short Duration Securitized Bond Fund Class I, C000173084 Prospectus Date Prospectus Date Expenses (as a percentage of Assets) Expenses (as a percentage of Assets) Class Y Diamond Hill Small-Mid Cap Fund Class Y Diamond Hill Small-Mid Cap Fund Class Y, C000108467 Bar Chart, Reason Selected Class Different from Immediately Preceding Period [Text] Bar Chart, Reason Selected Class Different from Immediately Preceding Period [Text] Class Y Diamond Hill International Fund Class Y Diamond Hill International Fund, Class Y, C000210481, DHIYX Expense Example Footnotes [Text Block] Expense Example Footnotes [Text Block] Lowest Quarterly Return, Date Lowest Quarterly Return, Date Prospectus: Prospectus: Diamond Hill Large Cap Fund Diamond Hill Large Cap Fund Diamond Hill Large Cap Fund, S000003155 Legal Entity Identifier Legal Entity Identifier Expense Example, No Redemption [Table] Expense Example, No Redemption [Table] Sector Emphasis Risk Member Sector Emphasis Risk Member Sector Emphasis Risk Member Risk/Return: Risk/Return: Performance Table Narrative Performance Table Narrative Highest Quarterly Return, Date Highest Quarterly Return, Date Amendment Description Amendment Description Expenses Explanation of Nonrecurring Account Fee [Text] Expenses Explanation of Nonrecurring Account Fee [Text] Performance Availability Phone [Text] Performance Availability Phone [Text] Bar Chart, Year to Date Return Bar Chart, Year to Date Return Investor Diamond Hill International Fund Class Investor Diamond Hill International Fund, Class Investor, C000210482, DHIAX Expense [Heading] Expense [Heading] Since Inception Since Inception Annual Return Caption [Text] Annual Return Caption [Text] Bar Chart [Table] Bar Chart [Table] Russell 2500 Index Russell 2500 Index Russell 2500 Index Greater China Risk Member Greater China Risk Member Greater China Risk Member Class I Diamond Hill Core Plus Bond Fund Class I Diamond Hill Core Plus Bond Fund Class I Performance One Year or Less [Text] Performance One Year or Less [Text] Mid Cap Company Risk Member Mid Cap Company Risk Member Mid Cap Company Risk Member Objective [Heading] Objective [Heading] Russell 1000 Value Index Russell 1000 Value Index Russell 1000 Value Index Performance Table Explanation after Tax Higher Performance Table Explanation after Tax Higher Bloomberg US 1-3 Year Government/Credit Index Bloomberg US 1-3 Year Government/Credit Index Bloomberg US 1-3 Year Government/Credit Index Sector Risk Member Sector Risk Member Sector Risk Member Risk Column [Text] Risk Column [Text] Quantitative Risk Member Quantitative Risk Member Quantitative Risk Member Expense Breakpoint, Minimum Investment Required [Amount] Expense Breakpoint, Minimum Investment Required [Amount] Expense Example, No Redemption, 3 Years Expense Example, No Redemption, 3 Years Expense Example, No Redemption, 1 Year Expense Example, No Redemption, 1 Year Investor Diamond Hill Short Duration Securitized Bond Fund Class Investor Diamond Hill Short Duration Securitized Bond Fund Class Investor, C000173083 Bar Chart Narrative [Text Block] Bar Chart Narrative [Text Block] Class Y Diamond Hill Core Plus Bond Fund Class Y Diamond Hill Core Plus Bond Fund Class Y Highest Quarterly Return, Label Highest Quarterly Return, Label Adjustable Rate Mortgage Loans ("ARMs") Risk Member Adjustable Rate Mortgage Loans ("ARMs") Risk Member Adjustable Rate Mortgage Loans ("ARMs") Risk Member Class I Diamond Hill International Fund Class I Diamond Hill International Fund, Class I, C000210483, DHIIX Label Label Performance Availability Website Address [Text] Performance Availability Website Address [Text] Focused Portfolio Risk Member Focused Portfolio Risk Member Focused Portfolio Risk Member Fixed Income Risk Member Fixed Income Risk Member Fixed Income Risk Member Objective, Secondary [Text Block] Objective, Secondary [Text Block] Consumer Loans Risk Member Consumer Loans Risk Member Consumer Loans Risk Member 60% Russell 1000 Index/40% Bloomberg US T-Bills 1-3 Month Index 60% Russell 1000 Index/40% Bloomberg US T-Bills 1-3 Month Index 60% Russell 1000 Index/40% Bloomberg US T-Bills 1-3 Month Index Expenses Not Correlated to Ratio Due to Acquired Fund Fees [Text] Expenses Not Correlated to Ratio Due to Acquired Fund Fees [Text] Bar Chart [Heading] Bar Chart [Heading] Expense Example Closing [Text Block] Expense Example Closing [Text Block]