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S000014609 [Member] Average Annual Total Returns
 12 Months Ended 60 Months Ended 114 Months Ended 120 Months Ended 229 Months Ended
Dec. 31, 2025
Dec. 31, 2025
Dec. 31, 2025
Dec. 31, 2025
Dec. 31, 2025
Russell 3000® Index (reflects no deduction for fees, expenses or taxes)          
Prospectus [Line Items]          
Average Annual Return, Percent [1] 17.15% 13.15%   14.29%  
Russell 2500™ Value Index (reflects no deduction for fees, expenses or taxes)          
Prospectus [Line Items]          
Average Annual Return, Percent [2] 12.73% 10.02%   9.72%  
Lipper Small-Cap Core Funds Classification Average (reflects no deduction for taxes or sales loads)          
Prospectus [Line Items]          
Average Annual Return, Percent [3] 6.99% 7.59%   9.14%  
Class A          
Prospectus [Line Items]          
Average Annual Return, Percent 5.41% 12.62%   9.85%
Performance Inception Date         Dec. 15, 2006
Class A | After Taxes on Distributions          
Prospectus [Line Items]          
Average Annual Return, Percent 3.72% 10.55%   7.78%
Performance Inception Date         Dec. 15, 2006
Class A | After Taxes on Distributions and Sales          
Prospectus [Line Items]          
Average Annual Return, Percent 4.29% 9.65%   7.34%
Performance Inception Date         Dec. 15, 2006
Class C          
Prospectus [Line Items]          
Average Annual Return, Percent 11.02% 13.12%   9.84%
Performance Inception Date         Dec. 15, 2006
Class I          
Prospectus [Line Items]          
Average Annual Return, Percent 12.13% 14.26%   10.78%
Performance Inception Date         Dec. 15, 2006
Class R6          
Prospectus [Line Items]          
Average Annual Return, Percent 12.33% 14.44% 11.31%  
Performance Inception Date     Jun. 30, 2016    
Class R6 | Russell 3000® Index (reflects no deduction for fees, expenses or taxes)          
Prospectus [Line Items]          
Average Annual Return, Percent [1]     14.65%    
Class R6 | Russell 2500™ Value Index (reflects no deduction for fees, expenses or taxes)          
Prospectus [Line Items]          
Average Annual Return, Percent [2]     9.38%    
Class R6 | Lipper Small-Cap Core Funds Classification Average (reflects no deduction for taxes or sales loads)          
Prospectus [Line Items]          
Average Annual Return, Percent [3]     9.21%    
[1] An index designed to measure the performance of the stocks of the 3,000 largest publicly traded U.S. companies, based on market capitalization. The index measures the performance of about 98% of the total market capitalization of the publicly traded U.S. equity market.
[2] An index designed to measure the performance of the small to mid-cap value segment of the U.S. equity universe. It includes those Russell 2500 companies with lower price-to-book ratios and lower forecasted growth values.
[3] Represents the average annualized total return for all reporting funds in the Lipper Small-Cap Core Funds Classification.