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Shareholder Report, Line Graph (Details) - USD ($)
12 Months Ended
Oct. 31, 2024
Oct. 31, 2023
Oct. 31, 2022
Oct. 31, 2021
Oct. 31, 2020
Oct. 31, 2019
Oct. 31, 2018
Oct. 31, 2017
Oct. 31, 2016
Oct. 31, 2015
Oct. 31, 2014
Institutional                      
Account Value [Line Items]                      
Line Graph and Table Measure Name Asia Pacific Small Company Portfolio – Institutional                    
Account Value $ 13,935 $ 11,418 $ 11,376 $ 15,562 $ 11,292 $ 11,324 $ 10,799 $ 11,804 $ 10,202 $ 8,781 $ 10,000
Institutional                      
Account Value [Line Items]                      
Line Graph and Table Measure Name Continental Small Company Portfolio – Institutional                    
Account Value $ 21,214 17,143 15,378 21,749 14,433 14,822 13,732 15,453 11,559 10,937 10,000
Institutional                      
Account Value [Line Items]                      
Line Graph and Table Measure Name DFA Commodity Strategy Portfolio – Institutional                    
Account Value $ 10,073 10,127 10,563 9,929 6,817 7,362 7,512 7,699 7,464 7,484 10,000
Institutional                      
Account Value [Line Items]                      
Line Graph and Table Measure Name DFA Global Real Estate Securities Portfolio – Institutional                    
Account Value $ 15,873 12,163 12,976 16,710 11,761 14,570 11,698 11,479 10,848 10,344 10,000
Institutional                      
Account Value [Line Items]                      
Line Graph and Table Measure Name DFA International Real Estate Securities Portfolio – Institutional                    
Account Value $ 11,153 9,224 9,563 13,190 9,866 12,979 10,592 10,617 10,068 9,963 10,000
Institutional                      
Account Value [Line Items]                      
Line Graph and Table Measure Name DFA International Small Cap Value Portfolio – Institutional                    
Account Value $ 17,766 14,395 12,220 15,376 10,633 12,227 11,877 13,710 10,754 10,331 10,000
Institutional                      
Account Value [Line Items]                      
Line Graph and Table Measure Name DFA Real Estate Securities Portfolio – Institutional                    
Account Value $ 18,985 14,133 15,333 19,018 12,936 15,451 12,297 11,982 11,319 10,589 10,000
Institutional                      
Account Value [Line Items]                      
Line Graph and Table Measure Name Emerging Markets Core Equity Portfolio – Institutional                    
Account Value $ 15,646 12,653 10,955 14,618 11,584 11,455 10,264 11,863 9,566 8,551 10,000
Institutional                      
Account Value [Line Items]                      
Line Graph and Table Measure Name Emerging Markets ex China Core Equity Portfolio – Institutional                    
Account Value $ 11,294 9,105 7,984                
Institutional                      
Account Value [Line Items]                      
Line Graph and Table Measure Name Emerging Markets Portfolio – Institutional                    
Account Value $ 14,774 11,971 10,592 14,302 11,732 11,461 10,320 11,746 9,410 8,476 10,000
Institutional                      
Account Value [Line Items]                      
Line Graph and Table Measure Name Emerging Markets Small Cap Portfolio – Institutional                    
Account Value $ 17,196 14,278 12,406 16,022 11,823 11,729 10,383 12,427 10,271 9,012 10,000
Institutional                      
Account Value [Line Items]                      
Line Graph and Table Measure Name Emerging Markets Targeted Value Portfolio – Institutional                    
Account Value $ 15,304 12,563 10,905 13,874 10,032 10,438          
Institutional                      
Account Value [Line Items]                      
Line Graph and Table Measure Name Emerging Markets Value Portfolio – Institutional                    
Account Value $ 15,565 12,640 10,919 13,575 10,035 11,119 10,606 11,713 9,415 8,170 10,000
Institutional                      
Account Value [Line Items]                      
Line Graph and Table Measure Name Enhanced U.S. Large Company Portfolio – Institutional                    
Account Value $ 31,762 22,913 20,875 25,849 18,227 16,638 14,384 13,619 11,025 10,525 10,000
Institutional                      
Account Value [Line Items]                      
Line Graph and Table Measure Name Global Small Company Portfolio – Institutional                    
Account Value $ 18,008 14,064 13,781 16,469 10,993 11,421 10,951 11,530      
Institutional                      
Account Value [Line Items]                      
Line Graph and Table Measure Name International Core Equity Portfolio – Institutional                    
Account Value $ 17,424 14,281 12,545 16,134 11,651 12,438 11,551 12,665 10,050 9,890 10,000
Institutional                      
Account Value [Line Items]                      
Line Graph and Table Measure Name International High Relative Profitability Portfolio – Institutional                    
Account Value $ 15,432 13,074 11,510 14,992 11,371 11,280 9,966 10,738      
Institutional                      
Account Value [Line Items]                      
Line Graph and Table Measure Name International Small Company Portfolio – Institutional                    
Account Value $ 18,000 14,626 13,227 18,007 12,786 13,269 12,466 13,781 10,891 10,330 10,000
Institutional                      
Account Value [Line Items]                      
Line Graph and Table Measure Name International Vector Equity Portfolio – Institutional                    
Account Value $ 17,497 14,324 12,528 16,093 11,314 12,353 11,710 12,942 10,204 9,886 10,000
Institutional                      
Account Value [Line Items]                      
Line Graph and Table Measure Name Japanese Small Company Portfolio – Institutional                    
Account Value $ 17,248 14,915 12,605 16,540 14,681 15,029 14,450 15,677 12,387 10,862 10,000
Institutional                      
Account Value [Line Items]                      
Line Graph and Table Measure Name Large Cap International Portfolio – Institutional                    
Account Value $ 17,065 13,921 12,212 15,482 11,422 12,157 11,009 11,840 9,565 9,690 10,000
Institutional                      
Account Value [Line Items]                      
Line Graph and Table Measure Name Selectively Hedged Global Equity Portfolio – Institutional                    
Account Value $ 24,232 18,622 17,017 19,708 13,996 13,931 12,653 12,948 10,397 9,966 10,000
Institutional                      
Account Value [Line Items]                      
Line Graph and Table Measure Name U.S. Core Equity 1 Portfolio – Institutional                    
Account Value $ 30,949 22,676 21,254 24,111 16,571 15,700 14,122 13,375 10,706 10,326 10,000
Institutional                      
Account Value [Line Items]                      
Line Graph and Table Measure Name U.S. Core Equity 2 Portfolio – Institutional                    
Account Value $ 29,468 21,635 20,479 23,059 15,649 14,995 13,660 13,114 10,546 10,192 10,000
Institutional                      
Account Value [Line Items]                      
Line Graph and Table Measure Name U.S. High Relative Profitability Portfolio – Institutional                    
Account Value $ 28,168 20,687 19,037 20,816 15,372 13,987 12,070 10,984      
Institutional                      
Account Value [Line Items]                      
Line Graph and Table Measure Name U.S. Large Cap Equity Portfolio – Institutional                    
Account Value $ 32,386 23,431 21,531 25,070 17,604 16,073 14,207 13,300 10,713 10,349 10,000
Institutional                      
Account Value [Line Items]                      
Line Graph and Table Measure Name U.S. Large Cap Value Portfolio – Institutional                    
Account Value $ 23,630 18,148 18,310 18,982 12,767 14,436 13,495 13,130 10,579 10,116 10,000
Institutional                      
Account Value [Line Items]                      
Line Graph and Table Measure Name U.S. Micro Cap Portfolio – Institutional                    
Account Value $ 23,467 17,898 18,789 20,406 12,443 13,805 13,772 13,597 10,547 10,111 10,000
Institutional                      
Account Value [Line Items]                      
Line Graph and Table Measure Name U.S. Small Cap Portfolio – Institutional                    
Account Value $ 23,357 17,742 18,474 20,441 12,913 13,604 13,415 13,313 10,629 10,234 10,000
Institutional                      
Account Value [Line Items]                      
Line Graph and Table Measure Name U.S. Small Cap Value Portfolio – Institutional                    
Account Value $ 22,923 17,623 18,073 17,969 10,386 12,092 12,471 12,659 10,154 9,717 10,000
Institutional                      
Account Value [Line Items]                      
Line Graph and Table Measure Name U.S. Targeted Value Portfolio – Institutional                    
Account Value $ 23,634 18,341 18,695 18,958 10,962 12,639 12,529 12,722 10,305 9,880 10,000
Institutional                      
Account Value [Line Items]                      
Line Graph and Table Measure Name U.S. Vector Equity Portfolio – Institutional                    
Account Value $ 24,248 18,397 18,473 19,954 12,875 13,714 12,948 12,859 10,310 9,982 10,000
Institutional                      
Account Value [Line Items]                      
Line Graph and Table Measure Name United Kingdom Small Company Portfolio – Institutional                    
Account Value $ 14,419 10,958 10,074 15,176 10,030 11,838 10,748 11,855 9,170 10,943 10,000
Institutional                      
Account Value [Line Items]                      
Line Graph and Table Measure Name World Core Equity Portfolio – Institutional                    
Account Value $ 23,673 18,079 16,489 19,775 14,049 13,876 12,622 12,900 10,309 9,939 10,000
Institutional                      
Account Value [Line Items]                      
Line Graph and Table Measure Name World ex U.S. Core Equity Portfolio – Institutional                    
Account Value $ 16,933 13,867 12,164 15,706 11,559 12,093 11,132 12,399 9,893 9,550 10,000
Institutional                      
Account Value [Line Items]                      
Line Graph and Table Measure Name World ex U.S. Targeted Value Portfolio – Institutional                    
Account Value $ 17,254 14,038 12,127 15,501 10,854 12,055 11,482 13,283 10,410 9,712 10,000
Institutional                      
Account Value [Line Items]                      
Line Graph and Table Measure Name World ex U.S. Value Portfolio – Institutional                    
Account Value $ 16,556 13,531 11,612 13,862 9,545 11,330 10,921 12,029 9,549 9,223 10,000
MSCI Pacific ex Japan Index (net div.) [Member]                      
Account Value [Line Items]                      
Line Graph and Table Measure Name MSCI Pacific ex Japan Index (net div.)                    
Account Value $ 14,929 11,874 11,295 14,289 10,940 12,073 10,382 11,065 9,336 8,510 10,000
MSCI Europe ex UK Index (net div.) [Member]                      
Account Value [Line Items]                      
Line Graph and Table Measure Name MSCI Europe ex UK Index (net div.)                    
Account Value $ 17,592 14,340 12,295 16,575 11,829 12,434 11,069 12,261 9,493 10,132 10,000
Bloomberg Global Aggregate Bond Index (hedged to USD) [Member]                      
Account Value [Line Items]                      
Line Graph and Table Measure Name Bloomberg Global Aggregate Bond Index (hedged to USD)                    
Account Value $ 12,328 11,216 11,026 12,548 12,652 12,128 10,958 10,936 10,803 10,272 10,000
MSCI All Country World IMI Index (net div.) [Member]                      
Account Value [Line Items]                      
Line Graph and Table Measure Name MSCI All Country World IMI Index (net div.)                    
Account Value $ 23,379 17,667 16,145 20,236 14,644 14,037 12,533 12,653 10,244 10,010 10,000
MSCI All Country World ex USA IMI Index (net div.) [Member]                      
Account Value [Line Items]                      
Line Graph and Table Measure Name MSCI All Country World ex USA IMI Index (net div.)                    
Account Value $ 16,163 13,009 11,655 15,576 11,899 12,174 10,975 11,987 9,684 9,611 10,000
MSCI World ex USA Index (net div.) [Member]                      
Account Value [Line Items]                      
Line Graph and Table Measure Name MSCI World ex USA Index (net div.)                    
Account Value $ 16,753 13,528 12,019 15,416 11,369 12,197 10,981 11,777 9,595 9,819 10,000
Russell 3000® Index [Member]                      
Account Value [Line Items]                      
Line Graph and Table Measure Name Russell 3000® Index                    
Account Value $ 32,298 23,429 21,617 25,894 17,995 16,337 14,395 13,504 10,892 10,449 10,000
MSCI Emerging Markets Index (net div.) [Member]                      
Account Value [Line Items]                      
Line Graph and Table Measure Name MSCI Emerging Markets Index (net div.)                    
Account Value $ 14,012 11,181 10,091 14,631 12,509 11,556 10,331 11,809 9,339 8,547 10,000
MSCI Emerging Markets ex China Index (net div.) [Member]                      
Account Value [Line Items]                      
Line Graph and Table Measure Name MSCI Emerging Markets ex China Index (net div.)                    
Account Value $ 10,396 8,174 7,637                
MSCI Emerging Markets Index (net div.) [Member]                      
Account Value [Line Items]                      
Line Graph and Table Measure Name MSCI Emerging Markets Index (net div.)                    
Account Value $ 14,012 11,181 10,091 14,631 12,509 11,556 10,331 11,809 9,339 8,547 10,000
MSCI Emerging Markets Index (net div.) [Member]                      
Account Value [Line Items]                      
Line Graph and Table Measure Name MSCI Emerging Markets Index (net div.)                    
Account Value $ 14,012 11,181 10,091 14,631 12,509 11,556 10,331 11,809 9,339 8,547 10,000
MSCI Emerging Markets Index (net div.) [Member]                      
Account Value [Line Items]                      
Line Graph and Table Measure Name MSCI Emerging Markets Index (net div.)                    
Account Value $ 13,388 10,683 9,642 13,979 11,952 11,041          
MSCI Emerging Markets Index (net div.) [Member]                      
Account Value [Line Items]                      
Line Graph and Table Measure Name MSCI Emerging Markets Index (net div.)                    
Account Value $ 14,012 11,181 10,091 14,631 12,509 11,556 10,331 11,809 9,339 8,547 10,000
S&P 500® Index [Member]                      
Account Value [Line Items]                      
Line Graph and Table Measure Name S&P 500® Index                    
Account Value $ 33,950 24,599 22,334 26,155 18,301 16,681 14,591 13,593 10,994 10,520 10,000
MSCI All Country World IMI Index (net div.) [Member]                      
Account Value [Line Items]                      
Line Graph and Table Measure Name MSCI All Country World IMI Index (net div.)                    
Account Value $ 21,630 16,345 14,937 18,722 13,549 12,987 11,595 11,707      
MSCI World ex USA Index (net div.) [Member]                      
Account Value [Line Items]                      
Line Graph and Table Measure Name MSCI World ex USA Index (net div.)                    
Account Value $ 16,753 13,528 12,019 15,416 11,369 12,197 10,981 11,777 9,595 9,819 10,000
MSCI World ex USA Index (net div.) [Member]                      
Account Value [Line Items]                      
Line Graph and Table Measure Name MSCI World ex USA Index (net div.)                    
Account Value $ 15,270 12,331 10,955 14,051 10,363 11,117 10,008 10,734      
MSCI World ex USA Index (net div.) [Member]                      
Account Value [Line Items]                      
Line Graph and Table Measure Name MSCI World ex USA Index (net div.)                    
Account Value $ 16,753 13,528 12,019 15,416 11,369 12,197 10,981 11,777 9,595 9,819 10,000
MSCI World ex USA Index (net div.) [Member]                      
Account Value [Line Items]                      
Line Graph and Table Measure Name MSCI World ex USA Index (net div.)                    
Account Value $ 16,753 13,528 12,019 15,416 11,369 12,197 10,981 11,777 9,595 9,819 10,000
MSCI Japan Index (net div.) [Member]                      
Account Value [Line Items]                      
Line Graph and Table Measure Name MSCI Japan Index (net div.)                    
Account Value $ 18,067 14,769 12,646 16,788 14,004 13,958 12,786 13,259 11,255 10,907 10,000
MSCI World ex USA Index (net div.) [Member]                      
Account Value [Line Items]                      
Line Graph and Table Measure Name MSCI World ex USA Index (net div.)                    
Account Value $ 16,753 13,528 12,019 15,416 11,369 12,197 10,981 11,777 9,595 9,819 10,000
MSCI All Country World IMI Index (net div.) [Member]                      
Account Value [Line Items]                      
Line Graph and Table Measure Name MSCI All Country World IMI Index (net div.)                    
Account Value $ 23,379 17,667 16,145 20,236 14,644 14,037 12,533 12,653 10,244 10,010 10,000
Russell 3000® Index [Member]                      
Account Value [Line Items]                      
Line Graph and Table Measure Name Russell 3000® Index                    
Account Value $ 32,298 23,429 21,617 25,894 17,995 16,337 14,395 13,504 10,892 10,449 10,000
Russell 3000® Index [Member]                      
Account Value [Line Items]                      
Line Graph and Table Measure Name Russell 3000® Index                    
Account Value $ 32,298 23,429 21,617 25,894 17,995 16,337 14,395 13,504 10,892 10,449 10,000
Russell 1000® Index [Member]                      
Account Value [Line Items]                      
Line Graph and Table Measure Name Russell 1000® Index                    
Account Value $ 26,574 19,247 17,580 21,023 14,649 13,213 11,575 10,820      
Russell 1000® Index [Member]                      
Account Value [Line Items]                      
Line Graph and Table Measure Name Russell 1000® Index                    
Account Value $ 33,206 24,050 21,967 26,269 18,305 16,511 14,464 13,520 10,933 10,486 10,000
Russell 1000® Index [Member]                      
Account Value [Line Items]                      
Line Graph and Table Measure Name Russell 1000® Index                    
Account Value $ 33,206 24,050 21,967 26,269 18,305 16,511 14,464 13,520 10,933 10,486 10,000
Russell 3000® Index [Member]                      
Account Value [Line Items]                      
Line Graph and Table Measure Name Russell 3000® Index                    
Account Value $ 32,298 23,429 21,617 25,894 17,995 16,337 14,395 13,504 10,892 10,449 10,000
Russell 3000® Index [Member]                      
Account Value [Line Items]                      
Line Graph and Table Measure Name Russell 3000® Index                    
Account Value $ 32,298 23,429 21,617 25,894 17,995 16,337 14,395 13,504 10,892 10,449 10,000
Russell 3000® Index [Member]                      
Account Value [Line Items]                      
Line Graph and Table Measure Name Russell 3000® Index                    
Account Value $ 32,298 23,429 21,617 25,894 17,995 16,337 14,395 13,504 10,892 10,449 10,000
Russell 3000® Index [Member]                      
Account Value [Line Items]                      
Line Graph and Table Measure Name Russell 3000® Index                    
Account Value $ 32,298 23,429 21,617 25,894 17,995 16,337 14,395 13,504 10,892 10,449 10,000
Russell 3000® Index [Member]                      
Account Value [Line Items]                      
Line Graph and Table Measure Name Russell 3000® Index                    
Account Value $ 32,298 23,429 21,617 25,894 17,995 16,337 14,395 13,504 10,892 10,449 10,000
MSCI United Kingdom Index (net div.) [Member]                      
Account Value [Line Items]                      
Line Graph and Table Measure Name MSCI United Kingdom Index (net div.)                    
Account Value $ 14,458 11,887 10,531 12,023 8,366 10,760 10,049 10,539 8,667 9,655 10,000
MSCI All Country World IMI Index (net div.) [Member]                      
Account Value [Line Items]                      
Line Graph and Table Measure Name MSCI All Country World IMI Index (net div.)                    
Account Value $ 23,379 17,667 16,145 20,236 14,644 14,037 12,533 12,653 10,244 10,010 10,000
MSCI All Country World ex USA IMI Index (net div.) [Member]                      
Account Value [Line Items]                      
Line Graph and Table Measure Name MSCI All Country World ex USA IMI Index (net div.)                    
Account Value $ 16,163 13,009 11,655 15,576 11,899 12,174 10,975 11,987 9,684 9,611 10,000
MSCI All Country World ex USA IMI Index (net div.) [Member]                      
Account Value [Line Items]                      
Line Graph and Table Measure Name MSCI All Country World ex USA IMI Index (net div.)                    
Account Value $ 16,163 13,009 11,655 15,576 11,899 12,174 10,975 11,987 9,684 9,611 10,000
MSCI All Country World ex USA IMI Index (net div.) [Member]                      
Account Value [Line Items]                      
Line Graph and Table Measure Name MSCI All Country World ex USA IMI Index (net div.)                    
Account Value $ 16,163 13,009 11,655 15,576 11,899 12,174 10,975 11,987 9,684 9,611 10,000
MSCI Pacific ex Japan Small Cap Index (net div.) [Member]                      
Account Value [Line Items]                      
Line Graph and Table Measure Name MSCI Pacific ex Japan Small Cap Index (net div.)                    
Account Value $ 14,188 11,443 11,691 15,402 11,471 11,137 10,023 11,014 9,434 8,533 10,000
MSCI Europe ex UK Small Cap Index (net div.) [Member]                      
Account Value [Line Items]                      
Line Graph and Table Measure Name MSCI Europe ex UK Small Cap Index (net div.)                    
Account Value $ 19,795 16,130 14,927 22,793 15,216 14,753 13,886 15,342 11,429 11,138 10,000
Bloomberg Commodity Total Return Index [Member]                      
Account Value [Line Items]                      
Line Graph and Table Measure Name Bloomberg Commodity Total Return Index                    
Account Value $ 9,921 10,040 10,347 9,309 6,467 7,087 7,275 7,404 7,234 7,428 10,000
S&P Global REIT Index (net div.) [Member]                      
Account Value [Line Items]                      
Line Graph and Table Measure Name S&P Global REIT Index (net div.)                    
Account Value $ 14,399 11,020 11,790 15,120 10,491 13,602 11,178 11,117 10,658 10,259 10,000
S&P Global ex US REIT Index (net div.) [Member]                      
Account Value [Line Items]                      
Line Graph and Table Measure Name S&P Global ex US REIT Index (net div.)                    
Account Value $ 10,866 8,964 9,461 13,101 9,861 13,091 10,654 10,709 10,132 10,004 10,000
MSCI World ex USA Small Value Index (net div.) [Member]                      
Account Value [Line Items]                      
Line Graph and Table Measure Name MSCI World ex USA Small Value Index (net div.)                    
Account Value $ 16,689 13,659 12,416 16,179 11,428 12,956 12,115 13,164 10,577 10,178 10,000
Dow Jones U.S. Select REIT Index [Member]                      
Account Value [Line Items]                      
Line Graph and Table Measure Name Dow Jones U.S. Select REIT Index                    
Account Value $ 17,250 12,716 13,564 16,949 10,858 14,504 12,014 11,659 11,217 10,687 10,000
MSCI Emerging Markets Value Index (net div.) [Member]                      
Account Value [Line Items]                      
Line Graph and Table Measure Name MSCI Emerging Markets Value Index (net div.)                    
Account Value $ 12,822 10,460 9,221 12,330 9,610 10,499 9,905 10,797 8,946 8,238 10,000
MSCI All Country World Small Cap Index (net div.) [Member]                      
Account Value [Line Items]                      
Line Graph and Table Measure Name MSCI All Country World Small Cap Index (net div.)                    
Account Value $ 17,996 13,987 13,811 17,711 12,196 12,164 11,259 11,701      
MSCI World ex USA Small Cap Index (net div.) [Member]                      
Account Value [Line Items]                      
Line Graph and Table Measure Name MSCI World ex USA Small Cap Index (net div.)                    
Account Value $ 17,308 14,004 13,254 18,702 13,632 13,721 12,634 13,694 10,881 10,466 10,000
MSCI Japan Small Cap Index (net div.) [Member]                      
Account Value [Line Items]                      
Line Graph and Table Measure Name MSCI Japan Small Cap Index (net div.)                    
Account Value $ 17,690 15,094 13,317 17,732 15,667 15,898 14,545 15,475 12,774 11,283 10,000
MSCI All Country World Index (net div.) [Member]                      
Account Value [Line Items]                      
Line Graph and Table Measure Name MSCI All Country World Index (net div.)                    
Account Value $ 23,808 17,929 16,225 20,270 14,766 14,078 12,503 12,568 10,201 9,997 10,000
Russell 1000® Value Index [Member]                      
Account Value [Line Items]                      
Line Graph and Table Measure Name Russell 1000® Value Index                    
Account Value $ 23,392 17,860 17,836 19,178 13,340 14,432 12,977 12,595 10,693 10,053 10,000
Russell 2000® Index [Member]                      
Account Value [Line Items]                      
Line Graph and Table Measure Name Russell 2000® Index                    
Account Value $ 21,460 16,006 17,506 21,490 14,251 14,270 13,603 13,355 10,446 10,034 10,000
Russell 2000® Index [Member]                      
Account Value [Line Items]                      
Line Graph and Table Measure Name Russell 2000® Index                    
Account Value $ 21,460 16,006 17,506 21,490 14,251 14,270 13,603 13,355 10,446 10,034 10,000
Russell 2000® Value Index [Member]                      
Account Value [Line Items]                      
Line Graph and Table Measure Name Russell 2000® Value Index                    
Account Value $ 20,280 15,391 17,087 19,141 11,650 13,534 13,112 13,190 10,568 9,712 10,000
Russell 2000® Value Index [Member]                      
Account Value [Line Items]                      
Line Graph and Table Measure Name Russell 2000® Value Index                    
Account Value $ 20,280 15,391 17,087 19,141 11,650 13,534 13,112 13,190 10,568 9,712 10,000
MSCI United Kingdom Small Cap Index (net div.) [Member]                      
Account Value [Line Items]                      
Line Graph and Table Measure Name MSCI United Kingdom Small Cap Index (net div.)                    
Account Value $ 13,571 10,350 9,842 15,778 10,827 12,596 11,513 12,494 9,456 11,242 10,000
MSCI All Country World Index (net div.) [Member]                      
Account Value [Line Items]                      
Line Graph and Table Measure Name MSCI All Country World Index (net div.)                    
Account Value $ 23,808 17,929 16,225 20,270 14,766 14,078 12,503 12,568 10,201 9,997 10,000
MSCI All Country World ex USA Index (net div.) [Member]                      
Account Value [Line Items]                      
Line Graph and Table Measure Name MSCI All Country World ex USA Index (net div.)                    
Account Value $ 15,972 12,846 11,463 15,228 11,745 12,059 10,838 11,812 9,553 9,532 10,000
MSCI All Country World ex USA SMID Value Index (net div.) [Member]                      
Account Value [Line Items]                      
Line Graph and Table Measure Name MSCI All Country World ex USA SMID Value Index (net div.)                    
Account Value $ 15,965 13,039 11,557 14,865 10,704 12,240 11,368 12,526 10,108 9,807 10,000
MSCI All Country World ex USA IMI Value Index (Net Div.) [Member]                      
Account Value [Line Items]                      
Line Graph and Table Measure Name MSCI All Country World ex USA IMI Value Index (net div.)                    
Account Value $ 15,041 12,178 10,623 13,075 9,487 11,184 10,539 11,454 9,328 9,244 10,000
MSCI All Country World ex USA Value Index (net div.) [Member]                      
Account Value [Line Items]                      
Line Graph and Table Measure Name MSCI All Country World ex USA Value Index (net div.)                    
Account Value $ 14,729 $ 11,921 $ 10,360 $ 12,654 $ 9,230 $ 10,981 $ 10,364 $ 11,232 $ 9,168 $ 9,146 $ 10,000