Label	Element	Value
Risk/Return:	rr_RiskReturnAbstract
ProspectusDate	rr_ProspectusDate	Jul. 28, 2011
Mid Cap Growth Portfolio (Prospectus Summary) | Mid Cap Growth Portfolio
Risk/Return:	rr_RiskReturnAbstract
Risk/Return, Heading	rr_RiskReturnHeading	Mid Cap Growth Portfolio
Investment Objective, Heading	rr_ObjectiveHeading	Investment Goal
investment Objective, Primary	rr_ObjectivePrimaryTextBlock	The Portfolio's investment goal is long-term growth of capital.
Expense, Heading	rr_ExpenseHeading	Fees and Expenses of the Portfolio
Expense, Narrative	rr_ExpenseNarrativeTextBlock	This table describes the fees and expenses that you may pay if you buy and hold shares of the Portfolio. The Portfolio's annual operating expenses do not reflect the separate account fees charged in the variable annuity or variable life insurance policy ("Variable Contracts"), in which the Portfolio is offered. Please see your Variable Contract prospectus for more details on the separate account fees.
Operating Expenses, Caption	rr_OperatingExpensesCaption	Annual Portfolio Operating Expenses (expenses that you pay each year as a percentage of the value of your investment)
Portfolio Turnover, Heading	rr_PortfolioTurnoverHeading	Portfolio Turnover
Portfolio Turnover	rr_PortfolioTurnoverTextBlock	The Portfolio pays transaction costs, such as commissions, when it buys and sells securities (or "turns over" its portfolio). A higher portfolio turnover may indicate higher transaction costs. These costs, which are not reflected in annual portfolio operating expenses or in the example, affect the Portfolio's performance. During the most recent fiscal year, the Portfolio's portfolio turnover rate was 64% of the average value of its portfolio.
Portfolio Turnover, Rate	rr_PortfolioTurnoverRate	64.00%
Expense Example, Heading	rr_ExpenseExampleHeading	Expense Example
Expense Example, Narrative	rr_ExpenseExampleNarrativeTextBlock	This Example is intended to help you compare the cost of investing in the Portfolio with the cost of investing in other mutual funds. The Example assumes that you invest $10,000 in the Portfolio for the time periods indicated and then redeem all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return each year and that the Portfolio's operating expenses remain the same. The Example does not reflect charges imposed by the Variable Contract. See the Variable Contract prospectus for information on such charges. Although your actual costs may be higher or lower, based on these assumptions and the net expenses shown in the fee table, your costs would be:
Investment Strategy, Heading	rr_StrategyHeading	Principal Investment Strategies of the Portfolio
Investment Strategy, Narrative	rr_StrategyNarrativeTextBlock	The Portfolio attempts to achieve its investment goal by investing, under normal circumstances, at least 80% of net assets in equity securities of medium-capitalization companies selected through a growth strategy. Medium-capitalization, or mid-cap companies will generally include companies whose market capitalizations range from the market capitalization of the smallest company included in the Russell Midcap® Index to the market capitalization of the largest company in the Russell Midcap® Index during the most recent 12-month period. As of the most recent annual reconstitution of the Russell Midcap® Index on June 27, 2011, the market capitalization range of the companies in the Index was $1.6 billion to $18.3 billion. The Portfolio may invest a substantial portion of its assets in equity securities of small- and large-capitalization companies, short-term investments (up to 20%), foreign securities (up to 30%) and passive foreign investment companies (PFICs). The Portfolio is actively-managed by two subadvisers. To balance the risks of the Portfolio, a portion of the Portfolio is passively-managed by the adviser who seeks to track an index or a subset of an index.
Risk, Heading	rr_RiskHeading	Principal Risks of Investing in the Portfolio
Risk, Narrative	rr_RiskNarrativeTextBlock	There can be no assurance that the Portfolio's investment goal will be met or that the net return on an investment in the Portfolio will exceed what could have been obtained through other investment or savings vehicles. Shares of the Portfolio are not bank deposits and are not guaranteed or insured by any bank, government entity or the Federal Deposit Insurance Corporation. As with any mutual fund, there is no guarantee that the Portfolio will be able to achieve its investment goals. If the value of the assets of the Portfolio goes down, you could lose money. The following is a summary description of the principal risks of investing in the Portfolio. Equity Securities Risk. The Portfolio invests principally in equity securities and is therefore subject to the risk that stock prices will fall and may underperform other asset classes. Individual stock prices fluctuate from day-to-day and may decline significantly. The prices of individual stocks may be negatively affected by poor company results or other factors affecting individual prices, as well as industry and/or economic trends and developments affecting industries or the securities market as a whole. Medium-Capitalization Companies Risk. Securities of medium-cap companies are usually more volatile and entail greater risks than securities of large companies. Securities Selection Risk. A strategy used by the Portfolio, or individual securities selected by the portfolio manager, may fail to produce the intended return. Growth Stock Risk. Growth stocks can be volatile for several reasons. Since the issuers usually reinvest a high portion of earnings in their own business, growth stocks may lack the comfortable dividend yield associated with value stocks that can cushion total return in a bear market. Also, growth stocks normally carry a higher price/earnings ratio than many other stocks. Consequently, if earnings expectations are not met, the market price of growth stocks will often go down more than other stocks. However, the market frequently rewards growth stocks with price increases when expectations are met or exceeded. Foreign Investment Risk. The value of your investment may be affected by fluctuating currency values, changing local and regional economic, political and social conditions, and greater market volatility. In addition, foreign securities may not be as liquid as domestic securities. Indexing Risk. The passively-managed index portion of the Portfolio generally will not sell securities in its portfolio and buy different securities over the course of a year other than in conjunction with changes in its target index, even if there are adverse developments concerning a particular security, company or industry. As a result, you may suffer losses that you would not experience with an actively managed mutual fund. Large-Capitalization Companies Risk. Large-cap companies tend to be less volatile than companies with smaller market capitalizations. In exchange for this potentially lower risk, the Portfolio's value may not rise as much as the value of portfolios that emphasize smaller companies. Small-Capitalization Companies Risk. Securities of small -cap companies are usually more volatile and entail greater risks than securities of large companies.
Risk, Lose Money	rr_RiskLoseMoney	As with any mutual fund, there is no guarantee that the Portfolio will be able to achieve its investment goals. If the value of the assets of the Portfolio goes down, you could lose money.
Risk, Not Insured Depository Institution	rr_RiskNotInsuredDepositoryInstitution	Shares of the Portfolio are not bank deposits and are not guaranteed or insured by any bank, government entity or the Federal Deposit Insurance Corporation.
Bar Chart and Performance Table, Heading	rr_BarChartAndPerformanceTableHeading	Performance Information
Performance, Narrative	rr_PerformanceNarrativeTextBlock	The following Risk/Return Bar Chart and Table illustrate the risks of investing in shares of the Portfolio by showing changes in the Portfolio's performance from calendar year to calendar year and comparing the Portfolio's average annual returns to those of the Russell Midcap Growth Index. Fees and expenses incurred at the contract level are not reflected in the bar chart or table. If these amounts were reflected, returns would be less than those shown. Of course, past performance is not necessarily an indication of how the Portfolio will perform in the future. Effective December 1, 2009, SunAmerica Asset Management Corp. ("SAAMCo") assumed management of the passively-managed portion of the Portfolio, which portion was previously managed by AIG Global Investment Corp.
Performance, Information Illustrates Variability of Returns	rr_PerformanceInformationIllustratesVariabilityOfReturns	The following Risk/Return Bar Chart and Table illustrate the risks of investing in shares of the Portfolio by showing changes in the Portfolio's performance from calendar year to calendar year and comparing the Portfolio's average annual returns to those of the Russell Midcap Growth Index.
Performance, Past Does Not Indicate Future	rr_PerformancePastDoesNotIndicateFuture	Of course, past performance is not necessarily an indication of how the Portfolio will perform in the future.
Bar Chart, Heading	rr_BarChartHeading	Class 1 Shares
Bar Chart, Does Not Reflect Sales Loads	rr_BarChartDoesNotReflectSalesLoads	Fees and expenses incurred at the contract level are not reflected in the bar chart or table. If these amounts were reflected, returns would be less than those shown.
Bar Chart, Closing	rr_BarChartClosingTextBlock	During the 10-year period shown in the bar chart, the highest return for a quarter was 22.83% (quarter ended December 31, 2001) and the lowest return for a quarter was -27.10% (quarter ended December 31, 2008). The year to date calendar return as of June 30, 2011 was 9.36%.
Average Annual Returns, Caption	rr_AverageAnnualReturnCaption	Average Annual Total Returns (For the periods ended December 31, 2010)
Mid Cap Growth Portfolio (Prospectus Summary) | Mid Cap Growth Portfolio | Class 1
Risk/Return:	rr_RiskReturnAbstract
Year to Date Return, Label	rr_YearToDateReturnLabel	The year to date calendar return
Bar Chart, Year to Date Return, Date	rr_BarChartYearToDateReturnDate	Jun. 30, 2011
Bar Chart, Year to Date Return	rr_BarChartYearToDateReturn	9.36%
Highest Quarterly Return, Label	rr_HighestQuarterlyReturnLabel	highest return for a quarter
Highest Quarterly Return, Date	rr_BarChartHighestQuarterlyReturnDate	Dec. 31, 2001
Highest Quarterly Return	rr_BarChartHighestQuarterlyReturn	22.83%
Lowest Quarterly Return, Label	rr_LowestQuarterlyReturnLabel	lowest return for a quarter
Lowest Quarterly Return, Date	rr_BarChartLowestQuarterlyReturnDate	Dec. 31, 2008
Lowest Quarterly Return	rr_BarChartLowestQuarterlyReturn	(27.10%)
Mid Cap Growth Portfolio | Russell Midcap Growth Index
Risk/Return:	rr_RiskReturnAbstract
Average Annual Returns, Label	rr_AverageAnnualReturnLabel	Russell Midcap Growth Index
Average Annual Returns, 1 Year	rr_AverageAnnualReturnYear01	26.38%
Average Annual Returns, 5 Years	rr_AverageAnnualReturnYear05	4.88%
Average Annual Returns, 10 Years	rr_AverageAnnualReturnYear10	3.12%
Average Annual Returns, Since Inception	rr_AverageAnnualReturnSinceInception	11.11%
Average Annual Returns, Inception Date	rr_AverageAnnualReturnInceptionDate	Nov. 11, 2002
Mid Cap Growth Portfolio | Class 1
Risk/Return:	rr_RiskReturnAbstract
Management Fees	rr_ManagementFeesOverAssets	0.85%
Service (12b-1) Fees	rr_DistributionAndService12b1FeesOverAssets	none
Other Expenses	rr_OtherExpensesOverAssets	0.27%
Total Annual Portfolio Operating Expenses	rr_ExpensesOverAssets	1.12%
Expense Example, With Redemption, 1 Year	rr_ExpenseExampleYear01	114
Expense Example, With Redemption, 3 Years	rr_ExpenseExampleYear03	356
Expense Example, With Redemption, 5 Years	rr_ExpenseExampleYear05	617
Expense Example, With Redemption, 10 Years	rr_ExpenseExampleYear10	1,363
Annual Return 2001	rr_AnnualReturn2001	(13.80%)
Annual Return 2002	rr_AnnualReturn2002	(23.46%)
Annual Return 2003	rr_AnnualReturn2003	43.77%
Annual Return 2004	rr_AnnualReturn2004	15.00%
Annual Return 2005	rr_AnnualReturn2005	10.38%
Annual Return 2006	rr_AnnualReturn2006	11.69%
Annual Return 2007	rr_AnnualReturn2007	15.92%
Annual Return 2008	rr_AnnualReturn2008	(43.36%)
Annual Return 2009	rr_AnnualReturn2009	42.11%
Annual Return 2010	rr_AnnualReturn2010	25.34%
Average Annual Returns, Label	rr_AverageAnnualReturnLabel	Class 1 Shares
Average Annual Returns, 1 Year	rr_AverageAnnualReturnYear01	25.34%
Average Annual Returns, 5 Years	rr_AverageAnnualReturnYear05	5.49%
Average Annual Returns, 10 Years	rr_AverageAnnualReturnYear10	4.63%
Mid Cap Growth Portfolio | Class 2
Risk/Return:	rr_RiskReturnAbstract
Management Fees	rr_ManagementFeesOverAssets	0.85%
Service (12b-1) Fees	rr_DistributionAndService12b1FeesOverAssets	0.15%
Other Expenses	rr_OtherExpensesOverAssets	0.27%
Total Annual Portfolio Operating Expenses	rr_ExpensesOverAssets	1.27%
Expense Example, With Redemption, 1 Year	rr_ExpenseExampleYear01	129
Expense Example, With Redemption, 3 Years	rr_ExpenseExampleYear03	403
Expense Example, With Redemption, 5 Years	rr_ExpenseExampleYear05	697
Expense Example, With Redemption, 10 Years	rr_ExpenseExampleYear10	1,534
Average Annual Returns, Label	rr_AverageAnnualReturnLabel	Class 2 Shares
Average Annual Returns, 1 Year	rr_AverageAnnualReturnYear01	25.21%
Average Annual Returns, 5 Years	rr_AverageAnnualReturnYear05	5.34%
Average Annual Returns, 10 Years	rr_AverageAnnualReturnYear10	4.49%
Mid Cap Growth Portfolio | Class 3
Risk/Return:	rr_RiskReturnAbstract
Management Fees	rr_ManagementFeesOverAssets	0.85%
Service (12b-1) Fees	rr_DistributionAndService12b1FeesOverAssets	0.25%
Other Expenses	rr_OtherExpensesOverAssets	0.27%
Total Annual Portfolio Operating Expenses	rr_ExpensesOverAssets	1.37%
Expense Example, With Redemption, 1 Year	rr_ExpenseExampleYear01	139
Expense Example, With Redemption, 3 Years	rr_ExpenseExampleYear03	434
Expense Example, With Redemption, 5 Years	rr_ExpenseExampleYear05	750
Expense Example, With Redemption, 10 Years	rr_ExpenseExampleYear10	1,646
Average Annual Returns, Label	rr_AverageAnnualReturnLabel	Class 3 Shares
Average Annual Returns, 1 Year	rr_AverageAnnualReturnYear01	25.16%
Average Annual Returns, 5 Years	rr_AverageAnnualReturnYear05	5.24%
Average Annual Returns, Since Inception	rr_AverageAnnualReturnSinceInception	10.84%
Average Annual Returns, Inception Date	rr_AverageAnnualReturnInceptionDate	Nov. 11, 2002