v3.25.4
Transamerica Energy Infrastructure Average Annual Total Returns - Retail Class [Member]
12 Months Ended 55 Months Ended 60 Months Ended 104 Months Ended 106 Months Ended 120 Months Ended 140 Months Ended
Oct. 31, 2025
Dec. 31, 2025
Dec. 31, 2025
[2]
Dec. 31, 2025
Dec. 31, 2025
[3]
Dec. 31, 2025
[4]
Dec. 31, 2025
Dec. 31, 2025
[5]
Russell 3000® Index (reflects no deduction for fees, expenses or taxes)[Member]                
Prospectus [Line Items]                
Average Annual Return, Percent   17.15% [1] 11.55% 13.15% [1] 14.28% 14.09% 14.29% [1]
Performance Inception Date Apr. 21, 2017 [3]   May 28, 2021     Mar. 10, 2017    
Alerian Midstream Energy Select Index (reflects no deduction for fees, expenses or taxes)[Member]                
Prospectus [Line Items]                
Average Annual Return, Percent   6.58%   24.26%     12.70%  
Alerian MLP Total Return Index (reflects no deduction for fees, expenses or taxes)[Member]                
Prospectus [Line Items]                
Average Annual Return, Percent   9.76%   25.96%     8.85%  
A                
Prospectus [Line Items]                
Average Annual Return, Percent   (2.06%)   13.59%     7.74%  
Performance Inception Date Apr. 30, 2013              
A | After Taxes on Distributions                
Prospectus [Line Items]                
Average Annual Return, Percent   (2.73%)   12.68%     6.80%  
A | After Taxes on Distributions and Sales                
Prospectus [Line Items]                
Average Annual Return, Percent   (0.87%)   10.53%     5.84%  
C                
Prospectus [Line Items]                
Average Annual Return, Percent   1.88%   13.99%     7.52%  
Performance Inception Date Apr. 30, 2013              
I                
Prospectus [Line Items]                
Average Annual Return, Percent   3.87%   15.26%     8.66%  
Performance Inception Date Apr. 30, 2013              
I2                
Prospectus [Line Items]                
Average Annual Return, Percent   4.09%   15.38%     8.78%  
Performance Inception Date Apr. 30, 2013              
[1] “Russell®” and other service marks and trademarks related to the Russell indexes are trademarks of the London Stock Exchange Group companies.
[2] “Russell®” and other service marks and trademarks related to the Russell indexes are trademarks of the London Stock Exchange Group companies.
[3] “Russell®” and other service marks and trademarks related to the Russell indexes are trademarks of the London Stock Exchange Group companies.
[4] “Russell®” and other service marks and trademarks related to the Russell indexes are trademarks of the London Stock Exchange Group companies.
[5] “Russell®” and other service marks and trademarks related to the Russell indexes are trademarks of the London Stock Exchange Group companies.