v3.26.3
Average Annual Total Returns
 12 Months Ended 60 Months Ended 114 Months Ended 120 Months Ended
Oct. 23, 2026
Dec. 31, 2025
Dec. 31, 2025
Dec. 31, 2025
Dec. 31, 2025
Institutional Class          
Prospectus [Line Items]          
Average Annual Return, Label [Optional Text] Return Before Taxes        
Average Annual Return, Percent [1]   22.90% 7.34%   7.93%
Performance Inception Date Jan. 18, 2012        
Institutional Class | After Taxes on Distributions          
Prospectus [Line Items]          
Average Annual Return, Label [Optional Text] Return After Taxes on Distributions        
Average Annual Return, Percent [1]   15.47% 4.39%   6.17%
Institutional Class | After Taxes on Distributions and Sales          
Prospectus [Line Items]          
Average Annual Return, Label [Optional Text] Return After Taxes on Distributions and Sale of Fund Shares        
Average Annual Return, Percent [1]   19.05% 5.66%   6.38%
Service Class          
Prospectus [Line Items]          
Average Annual Return, Label [Optional Text] Return Before Taxes        
Average Annual Return, Percent [1]   22.83% 7.23% 6.81%  
Performance Inception Date Jul. 15, 2016        
MSCI World Index (Net) (reflects no deductions for fees, expenses or taxes)          
Prospectus [Line Items]          
Average Annual Return, Label [Optional Text] MSCI World Index (Net) (reflects no deductions for fees, expenses or taxes)        
Average Annual Return, Percent [1]   21.09% 12.15% 12.48% 12.17%
S&P Global Infrastructure Index (reflects no deductions for fees, expenses or taxes)          
Prospectus [Line Items]          
Average Annual Return, Label [Optional Text] S&P Global Infrastructure Index (reflects no deductions for fees, expenses or taxes)        
Average Annual Return, Percent [1]   22.58% 10.97% 8.31% 9.42%
[1] The Institutional Class and the Service Class commenced operations on January 18, 2012, and July 15, 2016, respectively.