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Label Element Value
Allocation Balanced Portfolio  
Risk/Return: rr_RiskReturnAbstract  
Risk/Return [Heading] rr_RiskReturnHeading Allocation Balanced Portfolio
Objective [Heading] rr_ObjectiveHeading Investment Goal
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock

The Portfolio’s investment goal is long-term capital appreciation and current income.

Expense [Heading] rr_ExpenseHeading Fees and Expenses of the Portfolio
Expense Narrative [Text Block] 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. If the separate account’s fees were shown, the Portfolio’s annual operating expenses would be higher. Please see your Variable Contract prospectus for more details on the separate account fees. As an investor in the Portfolio, you pay the expenses of the Portfolio and indirectly pay a proportionate share of the expenses of the Underlying Portfolios (as defined herein) in which the Portfolio invests.

Operating Expenses Caption [Text] rr_OperatingExpensesCaption Annual Portfolio Operating Expenses (expenses that you pay each year as a percentage of the value of your investment)
Fee Waiver or Reimbursement over Assets, Date of Termination rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination Jul. 29, 2016
Portfolio Turnover [Heading] rr_PortfolioTurnoverHeading Portfolio Turnover
Portfolio Turnover [Text Block] 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 rate 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 8% of the average value of its portfolio.

Portfolio Turnover, Rate rr_PortfolioTurnoverRate 8.00%
Expenses Restated to Reflect Current [Text] rr_ExpensesRestatedToReflectCurrent The Expense Table above has been restated to reflect a complete fiscal year of the contractual Advisory Fee Waiver that was instituted on July 29, 2015.
Expense Example [Heading] rr_ExpenseExampleHeading Expense Example
Expense Example Narrative [Text Block] 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. If the Variable Contract fees were reflected the expenses would be higher. 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:

Strategy [Heading] rr_StrategyHeading Principal Investment Strategies of the Portfolio
Strategy Narrative [Text Block] rr_StrategyNarrativeTextBlock

The Portfolio is structured as a “fund-of-funds” which means that it pursues its investment goal by investing its assets in a combination of the Trust’s Portfolios (collectively, the “Underlying Portfolios”).


The Portfolio attempts to achieve its investment goal by investing its assets, under normal circumstances, among a combination of Underlying Portfolios, of which no more than 70% of its assets will be invested in equity portfolios.


The Underlying Portfolios have a variety of investment styles and focuses. The underlying equity portfolios include large, mid and small cap portfolios, growth and value-oriented portfolios and international portfolios. The underlying long-term fixed income portfolios include portfolios that invest in U.S. and non-U.S. issuers, corporate, mortgage-backed and government securities, investment grade securities, and securities rated below investment grade (commonly known as “junk bonds”).


The Adviser determines the Portfolio’s target asset class allocation. The target asset class allocation is generally broken down into the following asset classes: large cap growth/value stocks, mid cap growth/value stocks, small cap stocks, international stocks, bonds (investment grade, high-yield, inflation-protected) and cash equivalents. Based on these target asset class allocations, the Adviser determines a target portfolio allocation in which the Portfolio will invest in the Underlying Portfolios. The target allocation percentages as of March 31, 2015 were:


•

Large cap growth/value stocks

   26.0%   
•

Mid cap growth/value stocks

   8.0%   
•

Small cap stocks

   4.0%   
•

International stocks

   12.0%   
•

Bonds

   37.0%   
•

Inflation protected securities

   8.0%   
•

Cash equivalents

   5.0%   

The Portfolio’s asset allocation targets were changed as of July 29, 2015 to:


•

Large cap growth/value stocks

   23.8%   
•

Mid cap growth/value stocks

   4.8%   
•

Small cap stocks

   2.0%   
•

International stocks

   12.3%   
•

Bonds

   51.4%   
•

Inflation protected securities

   5.7%   

The Adviser performs an investment analysis of possible investments for the Portfolio and selects the universe of permitted Underlying Portfolios as well as the allocation to each Underlying Portfolio. The Adviser utilizes many factors, including research provided by an independent consultant. The consultant, Wilshire Associates Incorporated, provides statistical analysis and portfolio modeling to the Adviser with respect to the Portfolio’s investment allocation among the Underlying Portfolios, but does not have any advisory or portfolio transaction authority with regard to the Portfolio. The Adviser, not the Portfolio, pays the consultant. The Adviser reserves the right to change the Portfolio’s asset allocation among the Underlying Portfolios. The Adviser may change the target asset allocation percentage and may underweight or overweight such asset classes at its discretion. The percentage of the Portfolio’s assets invested in any of the Underlying Portfolios will vary from time to time.

Risk [Heading] rr_RiskHeading Principal Risks of Investing in the Portfolio
Risk Narrative [Text Block] 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 goal. 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.


Asset Allocation Risk. The Portfolio’s risks will directly correspond to the risks of the Underlying Portfolios in which it invests. The Portfolio is subject to the risk that the selection of the Underlying Portfolios and the allocation and reallocation of the Portfolio’s assets among the various asset classes and market sectors may not produce the desired result.


Equity Securities Risk. The Portfolio invests in Underlying Portfolios that invest 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.


Large-Capitalization Companies Risk. The Portfolio invests in Underlying Portfolios that invest substantially in large-cap companies. 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.


Growth Stock Risk. The Portfolio invests substantially in Underlying Portfolios with an investment strategy that focuses on selecting growth-style stocks. Growth stocks may lack the 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.


Value Investing Risk. The Portfolio invests substantially in Underlying Portfolios with an investment strategy that focuses on selecting value-style stocks. When investing in securities which are believed to be undervalued in the market, there is a risk that the market may not recognize a security’s intrinsic value for a long period of time, or that a stock judged to be undervalued may actually be appropriately priced.


Risk of Investing in Bonds. The Portfolio invests in Underlying Portfolios that invest principally in bonds, which may cause the value of your investment in the Portfolio to go up or down in response to changes in interest rates or defaults (or even the potential for future defaults) by bond issuers.


Interest Rate Fluctuations Risk. The Portfolio invests in Underlying Portfolios that invest substantially in fixed income securities. Fixed income securities may be subject to volatility due to changes in interest rates. Longer-term and lower coupon bonds tend to be more sensitive to changes in interest rates. Interest rates have been historically low, so the Portfolio faces a heightened risk that interest rates may rise.


Risk of Investing in Junk Bonds. The Portfolio invests in Underlying Portfolios that invest substantially in fixed income securities, a percentage of which may be invested in junk bonds. Junk bonds carry a substantial risk of default or changes in the issuer’s creditworthiness, or they may already be in default at the time of purchase.


Credit Risk. Credit risk applies to most fixed income securities, but is generally not a factor for obligations backed by the “full faith and credit” of the U.S. Government. An Underlying Portfolio could lose money if the issuer of a fixed income security is unable or perceived to be unable to pay interest or repay principal when it becomes due.


Foreign Investment Risk. The Portfolio’s investments in Underlying Portfolios that invest in the securities of foreign issuers or issuers with significant exposure to foreign markets involve additional risk. Foreign countries in which an Underlying Portfolio invests may have markets that are less liquid, less regulated and more volatile than U.S. markets. The value of an Underlying Portfolio’s investments may decline because of factors affecting the particular issuer as well as foreign markets and issuers generally, such as unfavorable government actions, and political or financial instability. Lack of information may also affect the value of these securities. The risks of foreign investments are heightened when investing in issuers in emerging market countries.


Currency Volatility Risk. The value of an Underlying Portfolio’s foreign investments may fluctuate due to changes in currency exchange rates. A decline in the value of foreign currencies relative to the U.S. dollar generally can be expected to depress the value of an Underlying Portfolio’s non-U.S. dollar-denominated securities.


Risks of Investing in Inflation-Indexed Securities. The Portfolio invests in Underlying Portfolios that invest in inflation-indexed securities. Inflation-indexed securities are debt instruments whose principal is indexed to an official or designated measure of inflation, such as the Consumer Price Index in the United States. Inflation-indexed securities issued by a foreign government or foreign corporation are adjusted to reflect a comparable inflation index, calculated by that government. Inflation-indexed securities are sensitive to changes in the real interest rate, which is the nominal interest rate minus the expected rate of inflation. Repayment of the original principal upon maturity (as adjusted for inflation) is guaranteed in the case of U.S. Treasury inflation-protected bonds (“TIPS”), even during a period of deflation. However, the current market value of a fixed income security is not guaranteed, and will fluctuate. Inflation-indexed securities, other than TIPS, may not provide a similar guarantee and may be supported only by the credit of the issuing entity. Inflation-indexed securities issued by corporations may be similar to TIPS, but are subject to the risk of the corporation’s inability to meet principal and interest payments on the obligation and may also be subject to price volatility due to such factors as interest rate sensitivity, market perception of the credit-worthiness of the issuer and general market liquidity.


Indexing Risk. Many of the Underlying Portfolios in which the Portfolio invests have a passively-managed portion that is managed to track the performance of an index. That portion of the Underlying Portfolios will not sell securities in its portfolio or 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, the Portfolio may suffer losses that might not be experienced with an investment in an actively-managed mutual fund.


Affiliated Fund Risk. The Adviser chooses the Underlying Portfolios in which the Portfolio invests. As a result, the Adviser may be subject to potential conflicts of interest in selecting the Underlying Portfolios because the fees payable to it by some of the Underlying Portfolios are higher than the fees payable by other Underlying Portfolios and because the Adviser is also responsible for managing portions of certain Underlying Portfolios. However, the Adviser has a fiduciary duty to act in the Portfolio’s best interests when selecting the Underlying Funds.


Fund-of-Funds Risk. The costs of investing in the Portfolio, as a fund-of-funds, may be higher than the costs of investing in a mutual fund that only invests directly in individual securities. An Underlying Portfolio may change its investment objective or policies without the Portfolio’s approval, which could force the Portfolio to withdraw its investment from such Underlying Portfolio at a time that is unfavorable to the Portfolio. In addition, one Underlying Portfolio may buy the same securities that another Underlying Portfolio sells. Therefore, the Portfolio would indirectly bear the costs of these trades without accomplishing any investment purpose. In addition, the Portfolio invests in Class 3 shares of the Underlying Portfolios, which are subject to service (12b-1) fees. The Portfolio’s Class 3 shares do not bear service (12b-1) fees. The service fees paid by the Portfolio as a result of its investments in the Underlying Portfolios are reflected under “Acquired Fund Fees and Expenses” in the “Annual Portfolio Operating Expenses” table.


Underlying Funds Risk. The risks of the Portfolio owning the Underlying Portfolios generally reflect the risks of owning the underlying securities held by the Underlying Portfolios, although lack of liquidity could result in and investment in the Underlying Portfolios being more volatile than an investment in the underlying portfolio of securities. Disruptions in the markets for the securities held by the Underlying Portfolios could result in losses on the Portfolio’s investment in such securities. The Underlying Portfolios also have fees that increase their costs versus owning the underlying securities directly.


Small- and Medium-Capitalization Companies Risk. The Portfolio invests in Underlying Portfolios that may invest in securities of small- and medium-capitalization companies. Securities of small- and medium-capitalization companies are usually more volatile and entail greater risks than securities of large companies.


Management Risk. The Portfolio is subject to management risk because it is an actively managed investment portfolio. The Portfolio’s portfolio managers apply investment techniques and risk analyses in making investment decisions, but there can be no guarantee that these decisions or individual securities selected by the portfolio managers will produce the desired results.


Market Risk. Share prices can fall because of weakness in the broad market, a particular industry, or specific holdings. The market as a whole can decline for many reasons, including adverse political or economic developments in the U.S. or abroad, changes in investor psychology, or heavy institutional selling. In addition, an Underlying Portfolio’s adviser’s or subadviser’s assessment of companies held by the Underlying Portfolio may prove incorrect, resulting in losses or poor performance even in a rising market.


Issuer Risk. The value of a security may decline for a number of reasons directly related to the issuer, such as management performance, financial leverage and reduced demand for the issuer’s goods and services.

Risk Lose Money [Text] rr_RiskLoseMoney If the value of the assets of the Portfolio goes down, you could lose money.
Risk Not Insured Depository Institution [Text] 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 [Text Block] rr_PerformanceNarrativeTextBlock

The following Risk/Return Bar Chart and Table illustrate the risks of investing in 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 S&P 500® Index, the Barclays U.S. Aggregate Bond Index and a Blended Index. The Blended Index consists of 50% S&P 500® Index and 50% Barclays U.S. Aggregate Bond Index. Effective July 29, 2015, the Portfolio replaced the S&P 500® Index with the Russell 3000® Index and added the MSCI EAFE Index (net). The Portfolio also added a new Blended Index that consists of 30% Russell 3000® Index, 10% MSCI EAFE Index (net) and 60% Barclays U.S. Aggregate Bond Index. The benchmark for equities is being changed to better represent the equity securities held in the Portfolio. The custom blend index is being change to better reflect the new target allocations as of July 29, 2015. 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 July 29, 2015, SAAMCo assumed day-to-day investment management of the Portfolio, which was previously managed by Ibbotson Associates, Inc.

Performance Information Illustrates Variability of Returns [Text] rr_PerformanceInformationIllustratesVariabilityOfReturns The following Risk/Return Bar Chart and Table illustrate the risks of investing in 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 S&P 500® Index, the Barclays U.S. Aggregate Bond Index and a Blended Index.
Performance Additional Market Index [Text] rr_PerformanceAdditionalMarketIndex The Blended Index consists of 50% S&P 500® Index and 50% Barclays U.S. Aggregate Bond Index.
Performance Past Does Not Indicate Future [Text] 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 3 Shares)
Bar Chart Closing [Text Block] rr_BarChartClosingTextBlock

During the periods shown in the bar chart, the highest return for a quarter was 12.55% (quarter ended June 30, 2009) and the lowest return for a quarter was -12.02% (quarter ended December 31, 2008). The year-to-date calendar return as of June 30, 2015 was 0.98%.

Year to Date Return, Label rr_YearToDateReturnLabel The year-to-date calendar return
Bar Chart, Year to Date Return, Date rr_BarChartYearToDateReturnDate Jun. 30, 2015
Bar Chart, Year to Date Return rr_BarChartYearToDateReturn 0.98%
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel highest return
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Jun. 30, 2009
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 12.55%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel lowest return
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Dec. 31, 2008
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (12.02%)
Performance Table Market Index Changed rr_PerformanceTableMarketIndexChanged Effective July 29, 2015, the Portfolio replaced the S&P 500® Index with the Russell 3000® Index and added the MSCI EAFE Index (net). The Portfolio also added a new Blended Index that consists of 30% Russell 3000® Index, 10% MSCI EAFE Index (net) and 60% Barclays U.S. Aggregate Bond Index.
Caption rr_AverageAnnualReturnCaption Average Annual Total Returns (For the periods ended December 31, 2014)
Allocation Balanced Portfolio | S&P 500® Index  
Risk/Return: rr_RiskReturnAbstract  
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 13.69%
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 15.45%
Average Annual Returns, Since Inception rr_AverageAnnualReturnSinceInception 7.80%
Average Annual Returns, Inception Date rr_AverageAnnualReturnInceptionDate Feb. 14, 2005
Allocation Balanced Portfolio | Barclays U.S. Aggregate Bond Index  
Risk/Return: rr_RiskReturnAbstract  
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 5.97%
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 4.45%
Average Annual Returns, Since Inception rr_AverageAnnualReturnSinceInception 4.66%
Average Annual Returns, Inception Date rr_AverageAnnualReturnInceptionDate Feb. 14, 2005
Allocation Balanced Portfolio | Russell 3000® Index  
Risk/Return: rr_RiskReturnAbstract  
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 12.56%
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 15.63%
Average Annual Returns, Since Inception rr_AverageAnnualReturnSinceInception 8.10%
Average Annual Returns, Inception Date rr_AverageAnnualReturnInceptionDate Feb. 14, 2005
Allocation Balanced Portfolio | MSCI EAFE Index (net)  
Risk/Return: rr_RiskReturnAbstract  
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 (4.90%)
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 5.33%
Average Annual Returns, Since Inception rr_AverageAnnualReturnSinceInception 4.52%
Average Annual Returns, Inception Date rr_AverageAnnualReturnInceptionDate Feb. 14, 2005
Allocation Balanced Portfolio | Blended Index  
Risk/Return: rr_RiskReturnAbstract  
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 9.85%
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 10.09%
Average Annual Returns, Since Inception rr_AverageAnnualReturnSinceInception 6.53%
Average Annual Returns, Inception Date rr_AverageAnnualReturnInceptionDate Feb. 14, 2005
Allocation Balanced Portfolio | New Blended Index  
Risk/Return: rr_RiskReturnAbstract  
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 6.84%
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 8.09%
Average Annual Returns, Since Inception rr_AverageAnnualReturnSinceInception 6.02%
Average Annual Returns, Inception Date rr_AverageAnnualReturnInceptionDate Feb. 14, 2005
Allocation Balanced Portfolio | Class 3  
Risk/Return: rr_RiskReturnAbstract  
Management Fees rr_ManagementFeesOverAssets 0.10%
Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Other Expenses rr_OtherExpensesOverAssets 0.04%
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 1.04%
Total Annual Portfolio Operating Expenses rr_ExpensesOverAssets 1.18%
Fee Waiver or Reimbursement [1],[2] rr_FeeWaiverOrReimbursementOverAssets (0.01%)
Total Annual Portfolio Operating Expenses After Fee Waiver and/or Expense Reimbursement [1],[2] rr_NetExpensesOverAssets 1.17%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 119
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 372
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 644
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,420
Annual Return 2006 rr_AnnualReturn2006 10.22%
Annual Return 2007 rr_AnnualReturn2007 5.82%
Annual Return 2008 rr_AnnualReturn2008 (23.38%)
Annual Return 2009 rr_AnnualReturn2009 21.44%
Annual Return 2010 rr_AnnualReturn2010 10.44%
Annual Return 2011 rr_AnnualReturn2011 0.51%
Annual Return 2012 rr_AnnualReturn2012 10.69%
Annual Return 2013 rr_AnnualReturn2013 11.46%
Annual Return 2014 rr_AnnualReturn2014 5.30%
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 5.30%
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 7.60%
Average Annual Returns, Since Inception rr_AverageAnnualReturnSinceInception 5.11%
Average Annual Returns, Inception Date rr_AverageAnnualReturnInceptionDate Feb. 14, 2005
[1] Pursuant to an Advisory Fee Waiver Agreement, effective July 29, 2015 through July 29, 2016, the investment adviser, SunAmerica Asset Management, LLC ("SAAMCo" or the "Adviser"), is contractually obligated to waive its advisory fee so that the advisory fee payable by the Portfolio is equal to 0.09% of the Portfolio's daily net assets with respect to the Allocation Balanced Portfolio. This Agreement may be modified or discontinued prior to July 29, 2016 only with the approval of the Board of Trustees of the Portfolio, including a majority of the Independent Trustees.
[2] The Expense Table above has been restated to reflect a complete fiscal year of the contractual Advisory Fee Waiver that was instituted on July 29, 2015.