v3.26.1
GMO International Equity Fund Average Annual Total Returns
 12 Months Ended 43 Months Ended 60 Months Ended 120 Months Ended 324 Months Ended 453 Months Ended
Feb. 28, 2025
Dec. 31, 2024
Dec. 31, 2024
Dec. 31, 2024
Dec. 31, 2024
Dec. 31, 2024
Dec. 31, 2024
Class III              
Prospectus [Line Items]              
Average Annual Return, Percent   12.98%   7.99% 5.78%   7.32%
Performance Inception Date Mar. 31, 1987            
Class III | After Taxes on Distributions              
Prospectus [Line Items]              
Average Annual Return, Percent   11.93%   6.52% 4.77%   5.93%
Class III | After Taxes on Distributions and Sales              
Prospectus [Line Items]              
Average Annual Return, Percent   8.45%   5.97% 4.47%   5.85%
Class III | MSCI EAFE Index (returns reflect no deduction for fees or expenses, but are net of withholding tax on dividend reinvestments)[Member]              
Prospectus [Line Items]              
Average Annual Return, Percent [1]   3.82%   4.73% 5.20%   5.22%
Class IV              
Prospectus [Line Items]              
Average Annual Return, Percent   13.02%   8.06% 5.84% 6.48%  
Performance Inception Date Jan. 09, 1998            
Class IV | MSCI EAFE Index (returns reflect no deduction for fees or expenses, but are net of withholding tax on dividend reinvestments)[Member]              
Prospectus [Line Items]              
Average Annual Return, Percent [1]   3.82%   4.73% 5.20% 5.06%  
Class I              
Prospectus [Line Items]              
Average Annual Return, Percent   12.77% 4.70%    
Performance Inception Date May 24, 2021            
Class I | MSCI EAFE Index (returns reflect no deduction for fees or expenses, but are net of withholding tax on dividend reinvestments)[Member]              
Prospectus [Line Items]              
Average Annual Return, Percent [1]   3.82%       1.80%  
[1] MSCI data may not be reproduced or used for any other purpose. MSCI provides no warranties, has not prepared or approved this report, and has no liability hereunder.