v3.25.4
Shareholder Report, Average Annual Return (Details)
 12 Months Ended 29 Months Ended 32 Months Ended 60 Months Ended 68 Months Ended 120 Months Ended
Dec. 31, 2025
Dec. 31, 2025
Dec. 31, 2025
Dec. 31, 2025
Dec. 31, 2025
Dec. 31, 2025
C000111397 [Member]            
Average Annual Return [Line Items]            
Line Graph and Table Measure Name First Trust/Dow Jones Dividend & Income Allocation Portfolio - Class I          
Average Annual Return, Percent 5.30%     3.98%   6.68%
C000138651 [Member]            
Average Annual Return [Line Items]            
Line Graph and Table Measure Name First Trust Multi Income Allocation Portfolio - Class I          
Average Annual Return, Percent 7.71%     6.11%   5.91%
C000160832 [Member]            
Average Annual Return [Line Items]            
Line Graph and Table Measure Name First Trust Dorsey Wright Tactical Core Portfolio - Class I          
Average Annual Return, Percent 9.69%     5.34%   6.63%
C000218786 [Member]            
Average Annual Return [Line Items]            
Line Graph and Table Measure Name First Trust Capital Strength® Portfolio - Class I          
Average Annual Return, Percent 5.70%     7.07% 10.35%  
C000218789 [Member]            
Average Annual Return [Line Items]            
Line Graph and Table Measure Name First Trust International Developed Capital Strength® Portfolio - Class I          
Average Annual Return, Percent 19.53%     6.45% 11.57%  
C000241974 [Member]            
Average Annual Return [Line Items]            
Line Graph and Table Measure Name First Trust Growth StrengthTM Portfolio - Class I          
Average Annual Return, Percent 11.75%   20.62%      
C000241976 [Member]            
Average Annual Return [Line Items]            
Line Graph and Table Measure Name First Trust Capital Strength® Hedged Equity Portfolio - Class I          
Average Annual Return, Percent (2.26%) (0.71%)        
Russell 3000 Index [Member]            
Average Annual Return [Line Items]            
Line Graph and Table Measure Name Russell 3000® Index          
Average Annual Return, Percent 17.15%     13.15%   14.29%
Bloomberg U S Aggregate Bond Index [Member]            
Average Annual Return [Line Items]            
Line Graph and Table Measure Name Bloomberg U.S. Aggregate Bond Index          
Average Annual Return, Percent 7.30%     (0.36%)   2.01%
Standard & Poor's 500 Index [Member]            
Average Annual Return [Line Items]            
Line Graph and Table Measure Name S&P 500® Index          
Average Annual Return, Percent 17.88% 21.05% 23.14% 14.42% 18.63% 14.82%
MSCI World ex USA Index [Member]            
Average Annual Return [Line Items]            
Line Graph and Table Measure Name MSCI World ex USA Index          
Average Annual Return, Percent 31.85%     9.46% 13.88%  
Blended Benchmark [Member]            
Average Annual Return [Line Items]            
Line Graph and Table Measure Name Blended Benchmark          
Average Annual Return, Percent [1] 12.52%     6.51%   8.87%
Dow Jones U S Total Stock Market IndexSM [Member]            
Average Annual Return [Line Items]            
Line Graph and Table Measure Name Dow Jones U.S. Total Stock Market IndexSM          
Average Annual Return, Percent 17.05%     13.07%   14.21%
Dow Jones Equal Weight U S Issued Corporate Bond IndexSM [Member]            
Average Annual Return [Line Items]            
Line Graph and Table Measure Name Dow Jones Equal Weight U.S. Issued Corporate Bond IndexSM          
Average Annual Return, Percent 7.25%     (0.46%)   3.20%
Secondary Blended Benchmark [Member]            
Average Annual Return [Line Items]            
Line Graph and Table Measure Name Secondary Blended Benchmark          
Average Annual Return, Percent [2] 12.21%     6.27%   8.80%
Bloomberg U S Corporate Investment Grade Index [Member]            
Average Annual Return [Line Items]            
Line Graph and Table Measure Name Bloomberg U.S. Corporate Investment-Grade Index          
Average Annual Return, Percent 7.77%     (0.09%)   3.27%
Broad Blended Benchmark [Member]            
Average Annual Return [Line Items]            
Line Graph and Table Measure Name Broad Blended Benchmark          
Average Annual Return, Percent [3] 11.32%     5.04%   7.03%
Asset Class Blended Benchmark [Member]            
Average Annual Return [Line Items]            
Line Graph and Table Measure Name Asset Class Blended Benchmark          
Average Annual Return, Percent [4] 7.71%     8.42%   6.81%
Broad Blended Benchmark C000160832 [Member]            
Average Annual Return [Line Items]            
Line Graph and Table Measure Name Broad Blended Benchmark          
Average Annual Return, Percent [5] 13.70%     8.47%   9.78%
[1]
The Blended Benchmark returns are a 50/50 split between the Russell 3000® Index and the Bloomberg U.S. Corporate Investment-Grade Index returns.
[2]
The Secondary Blended Benchmark return is a 50/50 split between the Dow Jones U.S. Total Stock Market IndexSM and the Dow Jones Equal Weight U.S. Issued Corporate Bond IndexSM returns.
[3] The Broad Blended Benchmark returns are split between the Bloomberg U.S. Aggregate Bond Index (60%) and the Russell 3000® Index (40%).
[4] The Asset Class Blended Benchmark is weighted to include nine indexes: Dow Jones U.S. Select Dividend TM Index (15%), ICE BofA Fixed Rate Preferred Securities Index (8%), Alerian MLP Index (15%), S&P U.S. REIT Index (15%), ICE BofA U.S. High Yield Constrained Index (8%),  Morningstar® LSTA® U.S. Leveraged Loan Index (15%), Bloomberg U.S. Corporate Investment-Grade Index (8%), ICE BofA U.S. MBS Index (8%), and ICE BofA U.S. Inflation-Linked Treasury Index (8%).
[5] The Broad Blended Benchmark return is split between the Bloomberg U.S. Aggregate Bond Index (40%) and the S&P 500® Index (60%).