v3.26.1
Performance Management - Third Avenue Value Portfolio
Apr. 24, 2026
Prospectus [Line Items]  
Bar Chart and Performance Table [Heading] Performance
Performance Narrative [Text Block]

The following bar chart and table provide an indication of the risks of investing in the Portfolio. The bar chart shows changes in the Portfolio’s performance from year to year for the past 10 years. The table compares the Portfolio’s average annual total returns to broad measure of market performance. These figures do not reflect charges assessed at the contract or separate account level. If any such charges were included, returns would be lower. The Portfolio’s past performance is not necessarily an indication of how the Portfolio will perform in the future.

Performance Past Does Not Indicate Future [Text] The Portfolio’s past performance is not necessarily an indication of how the Portfolio will perform in the future.
Performance Information Illustrates Variability of Returns [Text] The bar chart shows changes in the Portfolio’s performance from year to year for the past 10 years. The table compares the Portfolio’s average annual total returns to broad measure of market performance.
Bar Chart Does Not Reflect Sales Loads [Text] These figures do not reflect charges assessed at the contract or separate account level.
Bar Chart [Table]

 

Years Returns
2016
2017
2018
2019
2020
2021
2022
 2023
2024
2025

 

Bar Chart Closing [Text Block]

During the period shown in the above bar chart, the highest return for a quarter was 27.36% (quarter ended December 31, 2020) and the lowest return for a quarter was (40.25)% (quarter ended March 31, 2020).

Highest Quarterly Return, Label [Optional Text] highest return
Highest Quarterly Return 27.36%
Highest Quarterly Return, Date Dec. 31, 2020
Lowest Quarterly Return, Label [Optional Text] lowest return
Lowest Quarterly Return (40.25%)
Lowest Quarterly Return, Date Mar. 31, 2020
Performance Table Heading Average Annual Total Returns for the periods ending 12/31/25
Performance [Table]

Average Annual Total Returns for the periods ending 12/31/25

  One Year     Five Years     Ten Years    

Since Inception

(9/21/1999)

 
Third Avenue Value Portfolio     34.85 %     17.68 %     9.66 %     8.67 %
MSCI World Index (reflects no deductions for fees, expenses or taxes)1     21.60 %     12.66 %     12.74 %     7.41 %

 

1 An index is a hypothetical measure of performance based on the ups and downs in the values of securities representative of a particular market. The MSCI World Index is captures large and mid-cap representation across 23 Developed Markets countries. With 1,320 constituents, the MSCI World Index covers approximately 85% of the free float-adjusted market capitalization in each country. The MSCI World Index is not a security that can be purchased or sold, and its total returns are reflective of unmanaged portfolios. It is not possible to invest directly in an unmanaged index.
Index No Deduction for Fees, Expenses, or Taxes [Text] reflects no deductions for fees, expenses or taxes