NAA ALL CAP VALUE SERIES Market Risk [Member] Large Capitalization Company Risk [Member] Mid Capitalization Company Risk [Member] Small Capitalization Company Risk [Member] Value Investing Risk [Member] Management Style Risk [Member] Equity Securities Risk [Member] Investment Company Risk [Member] Preferred Stock Risk [Member] Convertible Securities Risk [Member] Warrants Risk [Member] Foreign Securities Risk [Member] Depositary Receipt Risk [Member] R E I Ts Risk [Member] Options Risk [Member] NAA LARGE CAP VALUE SERIES NAA LARGE CORE SERIES Growth Investing Risk [Member] Sector Concentration Risk [Member] NAA LARGE GROWTH SERIES NAA MID GROWTH SERIES NAA SMALL CAP VALUE SERIES NAA SMALL GROWTH SERIES NAA SMID-CAP VALUE SERIES NAA WORLD EQUITY INCOME SERIES Portfolio Turnover Risk [Member] Emerging Markets Risk [Member] Foreign Currency Risk [Member] Fixed Income Securities Risk [Member] Credit Risks [Member] Interest Rates Risk [Member] Prepayment Risks [Member] High Yield Bond Risk [Member] Derivatives Risk [Member] Leverage Risk [Member] Counterparty Credit Risk [Member] Futures Contracts Risk [Member] Swap Agreements Risk [Member] Foreign Currency Forward Contracts Risk [Member] NAA ALL CAP VALUE SERIES Class S NAA LARGE CAP VALUE SERIES Class S NAA LARGE CORE SERIES Class S NAA LARGE GROWTH SERIES Class S NAA MID GROWTH SERIES Class S NAA SMALL CAP VALUE SERIES Class S NAA SMALL GROWTH SERIES Class S NAA SMID-CAP VALUE SERIES Class S NAA WORLD EQUITY INCOME SERIES Class S NAA LARGE CORE SERIES Class L NAA LARGE GROWTH SERIES Class L NAA WORLD EQUITY INCOME SERIES Class L S&P Composite 1500 Value Index (reflects no deduction for fees, expenses, or taxes) S&P 500® Value Index (reflects no deduction for fees, expenses, or taxes) S&P 500® Index (reflects no deduction for fees, expenses, or taxes) S&P 500® Growth Index (reflects no deduction for fees, expenses, or taxes) S&P MidCap 400® Growth Index (reflects no deduction for fees, expenses or taxes) S&P Small Cap 600 Value Index (reflects no deduction for fees, expenses, or taxes) S&P Small Cap 600 Growth Index (reflects no deduction for fees, expenses, or taxes) S&P 1000 Value Index (reflects no deduction for fees, expenses, or taxes) S&P Developed BMI Index (reflects no deduction for fees, expenses, or taxes)