Shareholder Service Fee Interest Expense All Other Expenses Vaughan Nelson Emerging Markets Fund Vaughan Nelson International Fund Investor Class Institutional Class Investor Class Institutional Class Market Risk [Member] Equity Risk [Member] Foreign Investment Risk [Member] Risks Associated with China [Member] Risks Associated with Taiwan [Member] Emerging Markets Risk [Member] Currency Risk [Member] Market Capitalization Risk [Member] Sector Focus Risk [Member] Issuer Risk [Member] Portfolio Turnover Risk [Member] ETF Risk [Member] REIT Risk [Member] Management and Strategy Risk [Member] Focused Investing Risk [Member] Value-Oriented Investment Strategies Risk [Member] Convertible Securities Risk [Member] Preferred Stock Risk [Member] Recent Market Events [Member] Cybersecurity Risk [Member] MSCI Emerging Markets Index (reflects no deduction for fees, expenses or taxes) MSCI Emerging Markets SMID Cap Index (reflects no deduction for fees, expenses or taxes) MSCI All-Country World Index ex-USA (reflects no deduction for fees, expenses or taxes) MSCI EAFE Small Cap Index (reflects no deduction for fees, expenses or taxes) C000135917 Member Risks Associated With Taiwan Member Cybersecurity Risk Member Preferred Stock Risk Member index_ MSCI_ All Country_ World_ Index_ex USA_reflects_no_deduction_for_fees_expenses_or_taxes Member C000216360 Member index_ MSCI_ Emerging_ Markets_ SMID_ Cap_ Index_reflects_no_deduction_for_fees_expenses_or_taxes Member Emerging Markets Risk Member ETFRisk Member Risks Associated With China Member S000026080 Member C000078165 Member Foreign Investment Risk Member index_ MSCI_ Emerging_ Markets_ Index_reflects_no_deduction_for_fees_expenses_or_taxes Member Market Risk Member Value Oriented Investment Strategies Risk Member S000026082 Member Convertible Securities Risk Member Portfolio Turnover Risk Member REITRisk Member Currency Risk Member index_ MSCI_ EAFE_ Small_ Cap_ Index_reflects_no_deduction_for_fees_expenses_or_taxes Member Focused Investing Risk Member Equity Risk Member C000216361 Member Market Capitalization Risk Member Management And Strategy Risk Member Sector Focus Risk Member Recent Market Events Member Issuer Risk Member