v3.26.1
Average Annual Total Returns
 12 Months Ended 60 Months Ended 120 Months Ended
Jul. 31, 2026
Dec. 31, 2025
Dec. 31, 2025
Dec. 31, 2025
Service Shares Prospectus | Russell 1000® Index (reflects no deduction for fees, expense or taxes)        
Prospectus [Line Items]        
Average Annual Return, Label [Optional Text] Russell 1000® Index (reflects no deduction for fees, expenses or taxes)      
Average Annual Return, Percent   17.37% 13.59% 14.59%
Service Shares Prospectus | Russell 3000® Index (reflects no deduction for fees, expenses or taxes)        
Prospectus [Line Items]        
Average Annual Return, Label [Optional Text] Russell 3000® Index (reflects no deduction for fees, expenses or taxes)      
Average Annual Return, Percent   17.15% 13.15% 14.29%
Service Shares Prospectus | MSCI Emerging Markets Index (reflects no deduction for fees, expenses or taxes)        
Prospectus [Line Items]        
Average Annual Return, Label [Optional Text] MSCI Emerging Markets Index (reflects no deduction for fees, expenses or taxes)      
Average Annual Return, Percent   34.36% 4.67% 8.86%
Service Shares Prospectus | Russell 2500™ Index (reflects no deduction for fees, expenses or taxes)        
Prospectus [Line Items]        
Average Annual Return, Label [Optional Text] Russell 2500TM Index (reflects no deduction for fees, expenses or taxes)      
Average Annual Return, Percent   11.91% 7.26% 10.40%
Service Shares Prospectus | MSCI World ex-USA Index (reflects no deduction for fees, expenses or taxes)        
Prospectus [Line Items]        
Average Annual Return, Label [Optional Text] MSCI World ex-USA Index (reflects no deduction for fees, expenses or taxes)      
Average Annual Return, Percent   32.55% 10.04% 9.11%
Service Shares Prospectus | Bloomberg U.S. Aggregate Bond Index (reflects no deduction for fees, expenses or taxes)        
Prospectus [Line Items]        
Average Annual Return, Label [Optional Text] Bloomberg U.S. Aggregate Bond Index      (reflects no deduction for fees, expenses or taxes)      
Average Annual Return, Percent   7.30% (0.36%) 2.01%
Service Shares Prospectus | GuideMark(R) Large Cap Core Fund Service Shares        
Prospectus [Line Items]        
Average Annual Return, Label [Optional Text] Return Before Taxes      
Average Annual Return, Percent   14.23% 12.31% 13.12%
Service Shares Prospectus | GuideMark(R) Large Cap Core Fund Service Shares | After Taxes on Distributions        
Prospectus [Line Items]        
Average Annual Return, Label [Optional Text] Return After Taxes on Distributions      
Average Annual Return, Percent   10.03% 10.57% 11.95%
Service Shares Prospectus | GuideMark(R) Large Cap Core Fund Service Shares | 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   11.49% 9.61% 10.76%
Service Shares Prospectus | GuideMark(R) Emerging Markets Fund Service Shares        
Prospectus [Line Items]        
Average Annual Return, Label [Optional Text] Return Before Taxes      
Average Annual Return, Percent   30.25% 4.27% 7.97%
Service Shares Prospectus | GuideMark(R) Emerging Markets Fund Service Shares | After Taxes on Distributions        
Prospectus [Line Items]        
Average Annual Return, Label [Optional Text] Return After Taxes on Distributions      
Average Annual Return, Percent   30.11% 2.95% 6.84%
Service Shares Prospectus | GuideMark(R) Emerging Markets Fund Service Shares | 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   18.55% 3.21% 6.29%
Service Shares Prospectus | GuideMark(R) Small/Mid Cap Core Fund Service Shares        
Prospectus [Line Items]        
Average Annual Return, Label [Optional Text] Return Before Taxes      
Average Annual Return, Percent   8.80% 7.74% 10.26%
Service Shares Prospectus | GuideMark(R) Small/Mid Cap Core Fund Service Shares | After Taxes on Distributions        
Prospectus [Line Items]        
Average Annual Return, Label [Optional Text] Return After Taxes on Distributions      
Average Annual Return, Percent   7.16% 6.30% 8.50%
Service Shares Prospectus | GuideMark(R) Small/Mid Cap Core Fund Service Shares | 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   6.43% 5.98% 7.97%
Service Shares Prospectus | GuideMark(R) World ex-US Fund Service Shares        
Prospectus [Line Items]        
Average Annual Return, Label [Optional Text] Return Before Taxes      
Average Annual Return, Percent   33.51% 8.82% 8.04%
Service Shares Prospectus | GuideMark(R) World ex-US Fund Service Shares | After Taxes on Distributions        
Prospectus [Line Items]        
Average Annual Return, Label [Optional Text] Return After Taxes on Distributions      
Average Annual Return, Percent   29.14% 7.73% 7.37%
Service Shares Prospectus | GuideMark(R) World ex-US Fund Service Shares | 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   22.42% 6.95% 6.57%
Service Shares Prospectus | GuideMark(R) Core Fixed Income Fund Service Shares        
Prospectus [Line Items]        
Average Annual Return, Label [Optional Text] Return Before Taxes      
Average Annual Return, Percent   6.56% (0.82%) 1.56%
Service Shares Prospectus | GuideMark(R) Core Fixed Income Fund Service Shares | After Taxes on Distributions        
Prospectus [Line Items]        
Average Annual Return, Label [Optional Text] Return After Taxes on Distributions      
Average Annual Return, Percent   5.03% (1.97%) 0.49%
Service Shares Prospectus | GuideMark(R) Core Fixed Income Fund Service Shares | 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   3.86% (1.10%) 0.75%
RS Shares Prospectus | Russell 1000® Index (reflects no deduction for fees, expense or taxes)        
Prospectus [Line Items]        
Average Annual Return, Label [Optional Text] Russell 1000® Index (reflects no deduction for fees, expenses or taxes)      
Average Annual Return, Percent   17.37% 13.59% 14.59%
RS Shares Prospectus | Russell 3000® Index (reflects no deduction for fees, expenses or taxes)        
Prospectus [Line Items]        
Average Annual Return, Label [Optional Text] Russell 3000® Index (reflects no deduction for fees, expenses or taxes)      
Average Annual Return, Percent   17.15% 13.15% 14.29%
RS Shares Prospectus | MSCI Emerging Markets Index (reflects no deduction for fees, expenses or taxes)        
Prospectus [Line Items]        
Average Annual Return, Label [Optional Text] MSCI Emerging Markets Index (reflects no deduction for fees, expenses or taxes)      
Average Annual Return, Percent   34.36% 4.67% 8.86%
RS Shares Prospectus | Russell 2500™ Index (reflects no deduction for fees, expenses or taxes)        
Prospectus [Line Items]        
Average Annual Return, Label [Optional Text] Russell 2500TM Index (reflects no deduction for fees, expenses or taxes)      
Average Annual Return, Percent   11.91% 7.26% 10.40%
RS Shares Prospectus | MSCI World ex-USA Index (reflects no deduction for fees, expenses or taxes)        
Prospectus [Line Items]        
Average Annual Return, Label [Optional Text] MSCI World ex-USA Index (reflects no deduction for fees, expenses or taxes)      
Average Annual Return, Percent   32.55% 10.04% 9.11%
RS Shares Prospectus | Bloomberg U.S. Aggregate Bond Index (reflects no deduction for fees, expenses or taxes)        
Prospectus [Line Items]        
Average Annual Return, Label [Optional Text] Bloomberg U.S. Aggregate Bond Index      (reflects no deduction for fees, expenses or taxes)      
Average Annual Return, Percent   7.30% (0.36%) 2.01%
RS Shares Prospectus | GuideMark(R) Large Cap Core Fund Service Shares        
Prospectus [Line Items]        
Average Annual Return, Label [Optional Text] [1] Return Before Taxes      
Average Annual Return, Percent [1]   14.23% 12.31% 13.12%
RS Shares Prospectus | GuideMark(R) Large Cap Core Fund Service Shares | After Taxes on Distributions        
Prospectus [Line Items]        
Average Annual Return, Label [Optional Text] [1] Return After Taxes on Distributions      
Average Annual Return, Percent [1]   10.03% 10.57% 11.95%
RS Shares Prospectus | GuideMark(R) Large Cap Core Fund Service Shares | After Taxes on Distributions and Sales        
Prospectus [Line Items]        
Average Annual Return, Label [Optional Text] [1] Return After Taxes on Distributions and Sale of Fund Shares      
Average Annual Return, Percent [1]   11.49% 9.61% 10.76%
RS Shares Prospectus | GuideMark(R) Emerging Markets Fund Service Shares        
Prospectus [Line Items]        
Average Annual Return, Label [Optional Text] [2] Return Before Taxes      
Average Annual Return, Percent [2]   30.25% 4.27% 7.97%
RS Shares Prospectus | GuideMark(R) Emerging Markets Fund Service Shares | After Taxes on Distributions        
Prospectus [Line Items]        
Average Annual Return, Label [Optional Text] [2] Return After Taxes on Distributions      
Average Annual Return, Percent [2]   30.11% 2.95% 6.84%
RS Shares Prospectus | GuideMark(R) Emerging Markets Fund Service Shares | After Taxes on Distributions and Sales        
Prospectus [Line Items]        
Average Annual Return, Label [Optional Text] [2] Return After Taxes on Distributions and Sale of Fund Shares      
Average Annual Return, Percent [2]   18.55% 3.21% 6.29%
RS Shares Prospectus | GuideMark(R) Small/Mid Cap Core Fund Service Shares        
Prospectus [Line Items]        
Average Annual Return, Label [Optional Text] [3] Return Before Taxes      
Average Annual Return, Percent [3]   8.80% 7.74% 10.26%
RS Shares Prospectus | GuideMark(R) Small/Mid Cap Core Fund Service Shares | After Taxes on Distributions        
Prospectus [Line Items]        
Average Annual Return, Label [Optional Text] [3] Return After Taxes on Distributions      
Average Annual Return, Percent [3]   7.16% 6.30% 8.50%
RS Shares Prospectus | GuideMark(R) Small/Mid Cap Core Fund Service Shares | After Taxes on Distributions and Sales        
Prospectus [Line Items]        
Average Annual Return, Label [Optional Text] [3] Return After Taxes on Distributions and Sale of Fund Shares      
Average Annual Return, Percent [3]   6.43% 5.98% 7.97%
RS Shares Prospectus | GuideMark(R) World ex-US Fund Service Shares        
Prospectus [Line Items]        
Average Annual Return, Label [Optional Text] [4] Return Before Taxes      
Average Annual Return, Percent [4]   33.51% 8.82% 8.04%
RS Shares Prospectus | GuideMark(R) World ex-US Fund Service Shares | After Taxes on Distributions        
Prospectus [Line Items]        
Average Annual Return, Label [Optional Text] [4] Return After Taxes on Distributions      
Average Annual Return, Percent [4]   29.14% 7.73% 7.37%
RS Shares Prospectus | GuideMark(R) World ex-US Fund Service Shares | After Taxes on Distributions and Sales        
Prospectus [Line Items]        
Average Annual Return, Label [Optional Text] [4] Return After Taxes on Distributions and Sale of Fund Shares      
Average Annual Return, Percent [4]   22.42% 6.95% 6.57%
RS Shares Prospectus | GuideMark(R) Core Fixed Income Fund Service Shares        
Prospectus [Line Items]        
Average Annual Return, Label [Optional Text] [5] Return Before Taxes      
Average Annual Return, Percent [5]   6.56% (0.82%) 1.56%
RS Shares Prospectus | GuideMark(R) Core Fixed Income Fund Service Shares | After Taxes on Distributions        
Prospectus [Line Items]        
Average Annual Return, Label [Optional Text] [5] Return After Taxes on Distributions      
Average Annual Return, Percent [5]   5.03% (1.97%) 0.49%
RS Shares Prospectus | GuideMark(R) Core Fixed Income Fund Service Shares | After Taxes on Distributions and Sales        
Prospectus [Line Items]        
Average Annual Return, Label [Optional Text] [5] Return After Taxes on Distributions and Sale of Fund Shares      
Average Annual Return, Percent [5]   3.86% (1.10%) 0.75%
[1] Service Shares performance reflects any applicable fee waiver and/or expense reimbursements. The RS Shares have higher ongoing expenses than the Service Shares. Returns for the RS Shares are expected to be lower than the returns of the Service Shares shown due to differences in their expenses.
[2] Service Shares performance reflects any applicable fee waiver and/or expense reimbursements. The RS Shares have higher ongoing expenses than the Service Shares. Returns for the RS Shares are expected to be lower than the returns of the Service Shares shown due to differences in their expenses.
[3] Service Shares performance reflects any applicable fee waiver and/or expense reimbursements. The RS Shares have higher ongoing expenses than the Service Shares. Returns for the RS Shares are expected to be lower than the returns of the Service Shares shown due to differences in their expenses.
[4] Service Shares performance reflects any applicable fee waiver and/or expense reimbursements. The RS Shares have higher ongoing expenses than the Service Shares. Returns for the RS Shares are expected to be lower than the returns of the Service Shares shown due to differences in their expenses.
[5] Service Shares performance reflects any applicable fee waiver and/or expense reimbursements. The RS Shares have higher ongoing expenses than the Service Shares. Returns for the RS Shares are expected to be lower than the returns of the Service Shares shown due to differences in their expenses.