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Risk/Return: rr_RiskReturnAbstract  
ProspectusDate rr_ProspectusDate Jan. 10, 2012
Real Return Portfolio (Prospectus Summary) | Real Return Portfolio
  
Risk/Return: rr_RiskReturnAbstract  
Risk/Return, Heading rr_RiskReturnHeading Real Return Portfolio
Investment Objective, Heading rr_ObjectiveHeading Investment Goal
investment Objective, Primary rr_ObjectivePrimaryTextBlock 
The Portfolio's investment goal is total return that equals or exceeds the rate
of inflation over the long term, consistent with prudent investment management.
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 44% of the average value of its portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 44.00%
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, primarily in inflation-adjusted debt securities including
inflation-indexed bonds issued by the U.S. Treasury and inflation-indexed
securities issued by other entities such as U.S. and foreign corporations and
foreign governments.

As part of its investment strategy, the Portfolio may also invest in debt
securities that are not inflation-indexed and derivative instruments, such as
forwards, futures contracts or swap agreements in an effort to enhance returns,
provide inflation hedges or foreign currency hedges, increase market exposure
and investment flexibility, or to adjust exposures. The subadviser may engage in
frequent and active trading of portfolio securities.

"Real return" equals total return less the estimated cost of inflation, which is
typically measured by the change in an official inflation measure. The U.S.
Treasury uses the U.S. City Average All Items Consumer Price Index for All Urban
Consumers as the inflation measure. Inflation-indexed bonds issued by a foreign
government are generally adjusted to reflect a comparable inflation index,
calculated by that government.
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.

Risks of Investing in Bonds. The Portfolio invests significantly in bonds. As
with any fund that invests significantly in bonds, the value of your investment
in the Portfolio may go up or down in response to changes in interest rates or
defaults (or even the potential for future default) by bond issuers. To the
extent the Portfolio is invested in bonds, movements in the bond market
generally may affect its performance. In addition, individual bonds selected for
the Portfolio may underperform the market generally.

Risks of Investing 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 ("CPI") 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 rates, which is the nominal interest rate minus the
expected rate of inflation. The price of an inflation-indexed security will
increase if real interest rates decline, and decrease if real interest rates
increase. If the interest rate rises for reasons other than inflation, the value
of such instruments can be negatively impacted. Interest income will vary
depending on changes to the principal amount of the security. For U.S. tax
purposes, both interest payments and inflation adjustments to principal are
treated as interest income subject to taxation when received or accrued, and
inflation adjustments to principal are subject to taxation when the adjustment
is made and not when the instrument matures.

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. If a guarantee of principal
is not provided, the adjusted principal value of the fixed income security
repaid at maturity may be less than the original principal.

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. There are many
different types of corporate bonds, and each bond issue has specific terms.
Interest Rate Fluctuations Risk. Fixed income securities may be subject to
volatility due to changes in interest rates. The market value of bonds and other
fixed income securities usually tends to vary inversely with the level of
interest rates; as interest rates rise the value of such securities typically
falls, and as interest rates fall, the value of such securities typically rises.
Longer-term and lower coupon bonds tend to be more sensitive to changes in
interest rates. In periods of very low short-term interest rates, the
Portfolio's yield may become negative, which may result in a decline in the
value of your investment.

U.S. Government Obligations Risk. U.S. Treasury obligations are backed by the
"full faith and credit" of the U.S. Government and are generally considered to
have minimal credit risk. Securities issued or guaranteed by federal agencies or
authorities and U.S. Government-sponsored instrumentalities or enterprises may
or may not be backed by the full faith and credit of the U.S. Government. For
example, securities issued by the Federal Home Loan Mortgage Corporation, the
Federal National Mortgage Association and the Federal Home Loan Banks are
neither insured nor guaranteed by the U.S. Government; they may be supported
only by the ability to borrow from the U.S. Treasury or by the credit of the
issuing agency, authority, instrumentality or enterprise and, as a result, are
subject to greater credit risk than securities issued or guaranteed by the U.S.
Treasury.

Securities Selection Risk. A strategy used by the Portfolio, or individual
securities selected by the portfolio manager, may fail to produce the intended
return.

Foreign Investment Risk. The Portfolio may invest in foreign securities. These
securities may be denominated in currencies other than U.S. dollars. Foreign
investing presents special risks, particularly in certain emerging market
countries. While investing internationally may reduce your risk by increasing
the diversification of your investment, 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.

Foreign Sovereign Debt Risk. Foreign sovereign debt securities are subject to
the risk that a governmental entity may delay or refuse to pay interest or repay
principal on its sovereign debt, due, for example, to cash flow problems,
insufficient foreign currency reserves, political. social and economic
considerations, the relative size of the governmental entity's debt position in
relation to the economy or the failure to put in place economic reforms required
by the International Monetary Fund or other multilateral agencies. If a
governmental entity defaults, it may ask for more time in which to pay or for
further loans.

Derivatives Risk. A derivative is any financial instrument whose value is based
on, and determined by, another security, currency, index or benchmark (e.g.,
stock options, futures, caps, floors, etc.). In recent years, derivative
securities have become increasingly important in the field of finance. Futures
and options are now actively traded on many different exchanges. Forward
contracts, swaps, and many different types of options are regularly traded
outside of exchanges by financial institutions in what are termed "over the
counter" markets. Other more specialized derivative securities often form part
of a bond or stock issue. To the extent a contract is used to hedge another
position in the portfolio, the Portfolio will be exposed to the risks associated
with hedging as described in the Glossary. To the extent a forward, option or
futures contract is used to enhance return, rather than as a hedge, the
Portfolio will be directly exposed to the risks of the contract. Gains or losses
from non-hedging positions may be substantially greater than the cost of the
position. See "Additional Information About The Portfolios' Investment
Strategies and Investment Risks."

Hedging Risk. A hedge is an investment made in order to reduce the risk of
adverse price movements in a security, by taking an offsetting position in
a related security (often a derivative, such as an option or a short sale).
While hedging strategies can be very useful and inexpensive ways of reducing
risk, they are sometimes ineffective due to unexpected changes in the market
or exchange rates. Hedging also involves the risk that changes in the value
of the related security will not match those of the instruments being hedged
as expected, in which case any losses on the instruments being hedged may not
be reduced. For gross currency hedges, there is an additional risk, to the
extent that these transactions create exposure to currencies in which the
Portfolio's securities are not denominated. Moreover, while hedging can
reduce or eliminate losses, it can also reduce or eliminate
gains.

Regulatory Risk. Regulatory changes could adversely affect the Portfolio by
restricting its trading activities and/or increasing the costs or taxes to which
its investors are subject. The Dodd-Frank Wall Street Reform and Consumer
Protection Act (the "Dodd-Frank Act"), among other things, grants the CFTC and
SEC broad rulemaking authority to implement various provisions of the Dodd-Frank
Act, including comprehensive regulation of the OTC derivatives market. The
implementation of the Dodd-Frank Act could adversely affect the Portfolio by
increasing transaction and/or regulatory compliance costs. In addition, greater
regulatory scrutiny may increase the exposure of the Portfolio, the adviser and
the subadviser to potential liabilities.

Active Trading Risk. A strategy used whereby the Portfolio may engage in
frequent trading of portfolio securities to achieve its investment goal. Active
trading may result in high portfolio turnover and correspondingly greater
brokerage commissions and other transaction costs for the Portfolio.
Risk, Lose Money rr_RiskLoseMoney 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 of Barclays Capital World Government Inflation-Linked
1-10 Year Bond Index (Hedged to USD) and Barclays Capital 1-10 Year U.S.
Treasury Inflation Protected Securities (TIPS) 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.
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 of Barclays Capital World Government Inflation-Linked 1-10 Year Bond Index (Hedged to USD) and Barclays Capital 1-10 Year U.S.
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 3 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.
Bar Chart, Closing rr_BarChartClosingTextBlock 
During the periods shown in the bar chart, the highest return for a quarter was
9.95% (quarter ended June 30, 2009) and the lowest return for a quarter was
-10.56% (quarter ended December 31, 2008).
Performance Table, Closing rr_PerformanceTableClosingTextBlock 
No performance for Class 1 shares is shown because there were no Class 1 shares
outstanding during the periods shown. Returns are presented for Class 3 shares,
which are not offered in this Prospectus. Class 1 shares would have had
substantially similar annual returns because the shares are invested in the same
portfolio of securities and the annual returns would differ only to the extent
that the share classes do not have the same expenses.
Average Annual Returns, Caption rr_AverageAnnualReturnCaption Average Annual Total Returns (For the periods ended December 31, 2011)
Real Return Portfolio (Prospectus Summary) | Real Return Portfolio | Class 1
  
Risk/Return: rr_RiskReturnAbstract  
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel highest return for a quarter
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Jun. 30, 2009
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 9.95%
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 (10.56%)
Real Return Portfolio | Barclays Capital World Government Inflation Linked 1-10 Year Bond Index (Hedged to USD)
  
Risk/Return: rr_RiskReturnAbstract  
Average Annual Returns, Label rr_AverageAnnualReturnLabel Barclays Capital World Government Inflation Linked 1-10 Year Bond Index (Hedged to USD)
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 6.31%
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 5.67%
Average Annual Returns, Since Inception rr_AverageAnnualReturnSinceInception 4.80%
Average Annual Returns, Inception Date rr_AverageAnnualReturnInceptionDate Feb. 14, 2005
Real Return Portfolio | Barclays Capital 1-10 Year U.S. Treasury Inflation Protected Securities (TIPS) Index
  
Risk/Return: rr_RiskReturnAbstract  
Average Annual Returns, Label rr_AverageAnnualReturnLabel Barclays Capital 1-10 Year U.S. Treasury Inflation Protected Securities (TIPS) Index
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 8.93%
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 6.90%
Average Annual Returns, Since Inception rr_AverageAnnualReturnSinceInception 5.44%
Average Annual Returns, Inception Date rr_AverageAnnualReturnInceptionDate Feb. 14, 2005
Real Return Portfolio | Class 1
  
Risk/Return: rr_RiskReturnAbstract  
Management Fees rr_ManagementFeesOverAssets 0.60%
Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Other Expenses rr_OtherExpensesOverAssets 0.12% [1]
Total Annual Portfolio Operating Expenses rr_ExpensesOverAssets 0.72%
Expense Example, With Redemption, 1 Year rr_ExpenseExampleYear01 74
Expense Example, With Redemption, 3 Years rr_ExpenseExampleYear03 230
Expense Example, With Redemption, 5 Years rr_ExpenseExampleYear05 401
Expense Example, With Redemption, 10 Years rr_ExpenseExampleYear10 894
Annual Return 2006 rr_AnnualReturn2006 7.39%
Annual Return 2007 rr_AnnualReturn2007 3.20%
Annual Return 2008 rr_AnnualReturn2008 (15.37%)
Annual Return 2009 rr_AnnualReturn2009 24.84%
Annual Return 2010 rr_AnnualReturn2010 3.95%
Annual Return 2011 rr_AnnualReturn2011 6.07%
Average Annual Returns, Label rr_AverageAnnualReturnLabel Class 3 Shares
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 6.07%
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 3.75%
Average Annual Returns, Since Inception rr_AverageAnnualReturnSinceInception 4.17%
Average Annual Returns, Inception Date rr_AverageAnnualReturnInceptionDate Feb. 14, 2005
[1] "Other Expenses" have been estimated because no Class 1 Shares were outstanding during the Portfolio's last fiscal year.