v3.26.1
Annual Total Returns
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Service Shares Prospectus | GuideMark(R) Large Cap Core Fund | GuideMark(R) Large Cap Core Fund Service Shares                    
Prospectus [Line Items]                    
Annual Return [Percent] 14.23% 22.38% 25.29% (19.25%) 26.34% 22.20% 28.13% (5.51%) 20.68% 7.53%
Service Shares Prospectus | GuideMark(R) Emerging Markets Fund | GuideMark(R) Emerging Markets Fund Service Shares                    
Prospectus [Line Items]                    
Annual Return [Percent] 30.25% 7.96% 11.08% (20.74%) (0.45%) 15.40% 17.78% (15.13%) 38.27% 9.55%
Service Shares Prospectus | GuideMark(R) Small/Mid Cap Core Fund | GuideMark(R) Small/Mid Cap Core Fund Service Shares                    
Prospectus [Line Items]                    
Annual Return [Percent] 8.80% 11.44% 17.74% (18.28%) 24.40% 21.99% 23.21% (9.23%) 14.38% 17.21%
Service Shares Prospectus | GuideMark(R) World ex-US Fund | GuideMark(R) World ex-US Fund Service Shares                    
Prospectus [Line Items]                    
Annual Return [Percent] 33.51% 5.32% 16.10% (16.28%) 11.67% 8.63% 19.98% (14.09%) 25.93% 0.69%
Service Shares Prospectus | GuideMark(R) Core Fixed Income Fund | GuideMark(R) Core Fixed Income Fund Service Shares                    
Prospectus [Line Items]                    
Annual Return [Percent] 6.56% 1.42% 6.11% (14.61%) (2.03%) 8.19% 8.49% (1.41%) 2.81% 2.28%
RS Shares Prospectus | GuideMark(R) Large Cap Core Fund | GuideMark(R) Large Cap Core Fund Service Shares                    
Prospectus [Line Items]                    
Annual Return [Percent] 14.23% 22.38% 25.29% (19.25%) 26.34% 22.20% 28.13% (5.51%) 20.68% 7.53%
RS Shares Prospectus | GuideMark(R) Emerging Markets Fund | GuideMark(R) Emerging Markets Fund Service Shares                    
Prospectus [Line Items]                    
Annual Return [Percent] 30.25% 7.96% 11.08% (20.74%) (0.45%) 15.40% 17.78% (15.13%) 38.27% 9.55%
RS Shares Prospectus | GuideMark(R) Small/Mid Cap Core Fund | GuideMark(R) Small/Mid Cap Core Fund Service Shares                    
Prospectus [Line Items]                    
Annual Return [Percent] 8.80% 11.44% 17.74% (18.28%) 24.40% 21.99% 23.21% (9.23%) 14.38% 17.21%
RS Shares Prospectus | GuideMark(R) World ex-US Fund | GuideMark(R) World ex-US Fund Service Shares                    
Prospectus [Line Items]                    
Annual Return [Percent] 33.51% 5.32% 16.10% (16.28%) 11.67% 8.63% 19.98% (14.09%) 25.93% 0.69%
RS Shares Prospectus | GuideMark(R) Core Fixed Income Fund | GuideMark(R) Core Fixed Income Fund Service Shares                    
Prospectus [Line Items]                    
Annual Return [Percent] 6.56% 1.42% 6.11% (14.61%) (2.03%) 8.19% 8.49% (1.41%) 2.81% 2.28%