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Label Element Value
Risk/Return: rr_RiskReturnAbstract  
Document Type dei_DocumentType 485BPOS
Document Period End Date dei_DocumentPeriodEndDate Dec. 31, 2011
Registrant Name dei_EntityRegistrantName ING VARIABLE PRODUCTS TRUST
Central Index Key dei_EntityCentralIndexKey 0000916403
Amendment Flag dei_AmendmentFlag false
Document Creation Date dei_DocumentCreationDate Apr. 24, 2012
Document Effective Date dei_DocumentEffectiveDate Apr. 30, 2012
Prospectus Date rr_ProspectusDate Apr. 30, 2012
Class ADV Shares | ING International Value Portfolio
  
Risk/Return: rr_RiskReturnAbstract  
Risk/Return [Heading] rr_RiskReturnHeading

ING International Value Portfolio
Objective [Heading] rr_ObjectiveHeading

INVESTMENT OBJECTIVE
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock The Portfolio seeks long-term capital appreciation.
Expense [Heading] rr_ExpenseHeading

FEES AND EXPENSES OF THE PORTFOLIO
Expense Narrative [Text Block] rr_ExpenseNarrativeTextBlock The table describes the fees and expenses that you may pay if you buy and hold shares of the Portfolio. The table does not reflect fees or expenses that are, or may be, imposed under your variable annuity contracts or variable life insurance policies (“Variable Contract”) or a qualified pension or retirement plan (“Qualified Plan”). For more information on these charges, please refer to the documents governing your Variable Contract or consult your plan administrator.
Operating Expenses: rr_OperatingExpensesAbstract  
Operating Expenses Caption [Text] rr_OperatingExpensesCaption
Annual Portfolio Operating Expenses
Expenses you pay each year as a % of the value of your investment
Fee Waiver or Reimbursement over Assets, Date of Termination rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination May 1, 2013
Portfolio Turnover [Heading] rr_PortfolioTurnoverHeading
Portfolio Turnover % of average value of portfolio
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 transactions costs. These costs, which are not reflected in Annual Portfolio Operating Expenses or in the Expense Example, affect the Portfolio’s performance.

During the most recent fiscal year, the Portfolio’s portfolio turnover rate was 69% of the average value of its portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 69.00%
Expense Example: rr_ExpenseExampleAbstract  
Expense Example [Heading] rr_ExpenseExampleHeading
Expense Example $
Expense Example Narrative [Text Block] rr_ExpenseExampleNarrativeTextBlock The Example is intended to help you compare the cost of investing in shares of the Portfolio with the costs of investing in other mutual funds. The Example does not reflect expenses and charges which are, or may be, imposed under your Variable Contract or Qualified Plan. The Example assumes that you invest $10,000 in the Portfolio for the time periods indicated. The Example also assumes that your investment had a 5% return each year and that the Portfolio’s operating expenses remain the same. Although your actual costs may be higher or lower, based on these assumptions your costs would be:
Expense Example Closing [Text Block] rr_ExpenseExampleClosingTextBlock The Example reflects applicable expense limitation agreements and/or waivers in effect, if any, for the one-year period and the first year of the three-, five-, and ten-year periods.
Strategy [Heading] rr_StrategyHeading

PRINCIPAL INVESTMENT STRATEGIES
Strategy Narrative [Text Block] rr_StrategyNarrativeTextBlock

Under normal market conditions, the Portfolio invests at least 65% of its net assets in equity securities of companies located in a number of different countries outside of the United States. The Portfolio invests primarily in companies with a large market capitalization, but may also invest in small- and mid-sized companies. The Portfolio generally invests in common and preferred stocks, warrants, and convertible securities. The Portfolio may invest in companies located in countries with emerging securities markets when the sub-adviser (“Sub-Adviser”) believes they present attractive investment opportunities. The Portfolio may invest in government debt securities of developed foreign countries. The Portfolio may also invest up to 35% of its assets in securities of U.S. issuers, including investment-grade government and corporate debt securities.

The Portfolio may invest in derivative instruments including futures, options, and swaps. The Portfolio typically uses derivatives to hedge against currency risk and for purposes of maintaining equity market exposure on its cash balance.

The Portfolio may invest in other investment companies, including exchange-traded funds, to the extent permitted under the Investment Company Act of 1940, as amended, and the rules, regulations, and exemptive orders thereunder (“1940 Act”).

The Sub-Adviser primarily uses a bottom-up fundamental analysis to identify stocks which it believes offer good value relative to their peers in the same industry, sector, or region. It also uses a top-down analysis to identify important themes or issues which may affect the investment environment in certain regions or sectors and to estimate regional market risks. In conducting its fundamental analysis, the Sub-Adviser focuses on various factors including valuation of the companies, catalysts to stock price appreciation, quality of management, and financial measures, especially cash flow and cash flow return on capital.

The Sub-Adviser may sell securities for a variety of reasons, such as to secure gains, limit losses, or redeploy assets into opportunities believed to be more promising, among others.

The Portfolio may lend portfolio securities on a short-term or long-term basis, up to 331/3 % of its total assets.
Risk [Heading] rr_RiskHeading

PRINCIPAL RISKS
Risk Narrative [Text Block] rr_RiskNarrativeTextBlock

You could lose money on an investment in the Portfolio. Any of the following risks, among others, could affect Portfolio performance or cause the Portfolio to lose money or to underperform market averages of other funds.

Company The price of a given company’s stock could decline or underperform for many reasons including, among others, poor management, financial problems, or business challenges. If a company declares bankruptcy or becomes insolvent, its stock could become worthless.

Convertible Securities Convertible securities are securities that are convertible into or exercisable for common stocks at a stated price or rate. Convertible securities are subject to the usual risks associated with debt securities, such as interest rate and credit risk. In addition, because convertible securities react to changes in the value of the stocks into which they convert, they are subject to market risk.

Credit Prices of bonds and other debt securities can fall if the issuer’s actual or perceived financial health deteriorates, whether because of broad economic or issuer-specific reasons. In certain cases, the issuer could be late in paying interest or principal, or could fail to pay altogether.

Currency To the extent that the Portfolio invests directly in foreign currencies or in securities denominated in, or that trade in, foreign (non-U.S.) currencies, it is subject to the risk that those currencies will decline in value relative to the U.S. dollar or, in the case of hedging positions, that the U.S. dollar will decline in value relative to the currency being hedged.

Derivative Instruments Derivative instruments are subject to a number of risks, including the risk of changes in the market price of the underlying securities, credit risk with respect to the counterparty, risk of loss due to changes in interest rates and liquidity risk. The use of certain derivatives may also have a leveraging effect which may increase the volatility of the Portfolio and reduce its returns.

Foreign Investments/Developing and Emerging Markets Investing in foreign (non-U.S.) securities may result in the Portfolio experiencing more rapid and extreme changes in value than a fund that invests exclusively in securities of U.S. companies, due to smaller markets, differing reporting, accounting and auditing standards, and nationalization, expropriation or confiscatory taxation, foreign currency fluctuations, currency blockage, or replacement, potential for default on sovereign debt, or political changes or diplomatic developments. Foreign investment risks may be greater in developing and emerging markets than in developed markets.

Interest Rate With bonds and other fixed rate debt securities, a rise in interest rates generally causes values to fall; conversely, values generally rise as interest rates fall. The higher the credit quality of the security, and the longer its maturity or duration, the more sensitive it is likely to be to interest rate risk.

Liquidity If a security is illiquid, the Portfolio might be unable to sell the security at a time when the Portfolio’s manager might wish to sell, and the security could have the effect of decreasing the overall level of the Portfolio’s liquidity. Further, the lack of an established secondary market may make it more difficult to value illiquid securities, which could vary from the amount the Portfolio could realize upon disposition. The Portfolio may make investments that become less liquid in response to market developments or adverse investor perception. The Portfolio could lose money if it cannot sell a security at the time and price that would be most beneficial to the Portfolio.

Market Stock prices may be volatile and are affected by the real or perceived impacts of such factors as economic conditions and political events. The stock market tends to be cyclical, with periods when stock prices generally rise and periods when stock prices generally decline. Any given stock market segment may remain out of favor with investors for a short or long period of time, and stocks as an asset class may underperform bonds or other asset classes during some periods. From time to time, the stock market may not favor the value-oriented securities in which the Portfolio invests. Rather, the market could favor growth-oriented securities or may not favor equities at all.

Market Capitalization Stocks fall into three broad market capitalization categories - large, mid, and small. Investing primarily in one category carries the risk that, due to current market conditions, that category may be out of favor with investors. If valuations of large-capitalization companies appear to be greatly out of proportion to the valuations of mid- or small-capitalization companies, investors may migrate to the stocks of mid- and small-sized companies causing the Portfolio that invests in these companies to increase in value more rapidly than a fund that invests in larger, fully-valued companies. Investing in mid- and small-capitalization companies may be subject to special risks associated with narrower product lines, more limited financial resources, smaller management groups, and a more limited trading market for their stocks as compared with larger companies. As a result, stocks of mid- and small-capitalization companies may decline significantly in market downturns.

Other Investment Companies The main risk of investing in other investment companies, including exchange-traded funds, is the risk that the value of the securities underlying an investment company might decrease. Because the Portfolio may invest in other investment companies, you will pay a proportionate share of the expenses of that other investment company (including management fees, administration fees, and custodial fees) in addition to the expenses of the Portfolio.

Securities Lending Securities lending involves two primary risks: “investment risk” and “borrower default risk.” Investment risk is the risk that the Portfolio will lose money from the investment of the cash collateral received from the borrower. Borrower default risk is the risk that the Portfolio will lose money due to the failure of a borrower to return a borrowed security in a timely manner.

Sovereign Debt These securities are issued or guaranteed by foreign government entities. Investments in sovereign debt are subject to the risk that a government entity may delay payment, restructure its debt, or refuse to pay interest or repay principal on its sovereign debt. Some of these reasons may include cash flow problems, insufficient foreign currency reserves, political considerations, the relative size of its debt position to its economy or its failure to put in place economic reforms required by the International Monetary Fund or other multilateral agencies. If a government entity defaults, it may ask for more time in which to pay or for further loans. There is no legal process for collecting sovereign debts that a government does not pay or bankruptcy proceeding by which all or part of sovereign debt that a government entity has not repaid may be collected.

U.S. Government Securities and Obligations U.S. government securities are obligations of, or guaranteed by, the U.S. government, its agencies or government-sponsored enterprises. U.S. government securities are subject to market and interest rate risk, and may be subject to varying degrees of credit risk.

Value Investing Securities that appear to be undervalued may never appreciate to the extent expected. Further, because the prices of value-oriented securities tend to correlate more closely with economic cycles than growth-oriented securities, they generally are more sensitive to changing economic conditions, such as changes in interest rates, corporate earnings and industrial production.

An investment in the Portfolio is not a bank deposit and is not insured or guaranteed by the Federal Deposit Insurance Corporation, the Federal Reserve Board or any other government agency.

Risk Lose Money [Text] rr_RiskLoseMoney You could lose money on an investment in the Portfolio.
Risk Not Insured Depository Institution [Text] rr_RiskNotInsuredDepositoryInstitution An investment in the Portfolio is not a bank deposit and is not insured or guaranteed by the Federal Deposit Insurance Corporation, the Federal Reserve Board or any other government agency.
Bar Chart and Performance Table [Heading] rr_BarChartAndPerformanceTableHeading

PERFORMANCE INFORMATION
Performance Narrative [Text Block] rr_PerformanceNarrativeTextBlock The following information is intended to help you understand the risks of investing in the Portfolio. The following bar chart shows the changes in the Portfolio’s Class ADV shares’ and Class I shares’ performance from year to year, and the table compares the Portfolio’s Class ADV shares’ and Class I shares’ performance to the performance of a broad-based securities market index/indices for the same period. Class I shares’ performance has been adjusted to reflect the higher expenses of Class ADV shares. The Class ADV shares and Class I shares of the Portfolio would have substantially similar performance because they invest in the same portfolio of securities. However, Class I shares’ performance would be higher than Class ADV shares’ performance because of the higher expenses paid by Class ADV shares. The Portfolio’s performance information reflects applicable fee waivers and/or expense limitations in effect during the period presented. Absent such fee waivers/expense limitations, if any, performance would have been lower. Performance in the Average Annual Total Returns table does not include insurance-related charges imposed under a Variable Contract or expenses related to a Qualified Plan. If these charges or expenses were included, performance would be lower. Thus, you should not compare the Portfolio’s performance directly with the performance information of other investment products without taking into account all insurance-related charges and expenses payable under your Variable Contract or Qualified Plan. The Portfolio’s past performance is no guarantee of future results.
Performance Information Illustrates Variability of Returns [Text] rr_PerformanceInformationIllustratesVariabilityOfReturns The following bar chart shows the changes in the Portfolio’s Class ADV shares’ and Class I shares’ performance from year to year, and the table compares the Portfolio’s Class ADV shares’ and Class I shares’ performance to the performance of a broad-based securities market index/indices for the same period.
Performance Past Does Not Indicate Future [Text] rr_PerformancePastDoesNotIndicateFuture The Portfolio’s past performance is no guarantee of future results.
Bar Chart Table: rr_BarChartTableAbstract  
Bar Chart [Heading] rr_BarChartHeading
Calendar Year Total Returns
(as of December 31 of each year)
Bar Chart Narrative [Text Block] rr_BarChartNarrativeTextBlock The bar chart below shows the Portfolio’s adjusted Class I shares’ performance (2002-2006) and Class ADV shares’ performance (2007-2011).
Bar Chart Closing [Text Block] rr_BarChartClosingTextBlock Best quarter: 2nd, 2009, 27.00% and Worst quarter: 3rd, 2011, (23.03)%
Average Annual Return: rr_AverageAnnualReturnAbstract  
Performance Table Heading rr_PerformanceTableHeading
Average Annual Total Returns%
(for the periods ended December 31, 2011)
Index No Deduction for Fees, Expenses, Taxes [Text] rr_IndexNoDeductionForFeesExpensesTaxes The index returns include the reinvestment of dividends and distributions net of withholding taxes, but do not reflect fees, brokerage commissions, or other expenses.
Class ADV Shares | ING International Value Portfolio | Class ADV
  
Operating Expenses: rr_OperatingExpensesAbstract  
Management Fee rr_ManagementFeesOverAssets 0.80%
Distribution and/or Shareholder Services (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.50%
Administrative Services Fee rr_Component1OtherExpensesOverAssets 0.10%
Other Expenses rr_OtherExpensesOverAssets 0.16%
Total Annual Portfolio Operating Expenses rr_ExpensesOverAssets 1.56%
Waivers and Reimbursements rr_FeeWaiverOrReimbursementOverAssets (0.05%) [1]
Total Annual Portfolio Operating Expenses After Waivers and Reimbursements rr_NetExpensesOverAssets 1.51%
Expense Example: rr_ExpenseExampleAbstract  
1 Yr rr_ExpenseExampleYear01 154
3 Yrs rr_ExpenseExampleYear03 488
5 Yrs rr_ExpenseExampleYear05 845
10 Yrs rr_ExpenseExampleYear10 1,852
Bar Chart Table: rr_BarChartTableAbstract  
2007 rr_AnnualReturn2007 12.63%
2008 rr_AnnualReturn2008 (43.11%)
2009 rr_AnnualReturn2009 26.88%
2010 rr_AnnualReturn2010 2.02%
2011 rr_AnnualReturn2011 (15.40%)
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel Best quarter:
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Jun. 30, 2009
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 27.00%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel Worst quarter:
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Sep. 30, 2011
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (23.03%)
Average Annual Return: rr_AverageAnnualReturnAbstract  
1 Yr rr_AverageAnnualReturnYear01 (15.40%)
5 Yrs rr_AverageAnnualReturnYear05 (6.84%)
10 Yrs rr_AverageAnnualReturnYear10   
Since Inception rr_AverageAnnualReturnSinceInception (6.83%)
Inception Date rr_AverageAnnualReturnInceptionDate Dec. 29, 2006
Class ADV Shares | ING International Value Portfolio | Class I
  
Bar Chart Table: rr_BarChartTableAbstract  
2002 rr_AnnualReturn2002 (15.88%)
2003 rr_AnnualReturn2003 29.27%
2004 rr_AnnualReturn2004 16.84%
2005 rr_AnnualReturn2005 8.89%
2006 rr_AnnualReturn2006 28.80%
Average Annual Return: rr_AverageAnnualReturnAbstract  
1 Yr rr_AverageAnnualReturnYear01 (15.39%) [2]
5 Yrs rr_AverageAnnualReturnYear05 (6.83%) [2]
10 Yrs rr_AverageAnnualReturnYear10 2.26% [2]
Inception Date rr_AverageAnnualReturnInceptionDate Aug. 08, 1997 [2]
Class ADV Shares | ING International Value Portfolio | MSCI EAFE Index | Class ADV
  
Average Annual Return: rr_AverageAnnualReturnAbstract  
1 Yr rr_AverageAnnualReturnYear01 (12.14%) [3]
5 Yrs rr_AverageAnnualReturnYear05 (4.72%) [3]
10 Yrs rr_AverageAnnualReturnYear10    [3]
Since Inception rr_AverageAnnualReturnSinceInception (4.72%) [3],[4]
Class ADV Shares | ING International Value Portfolio | MSCI EAFE Index | Class I
  
Average Annual Return: rr_AverageAnnualReturnAbstract  
1 Yr rr_AverageAnnualReturnYear01 (12.14%) [3]
5 Yrs rr_AverageAnnualReturnYear05 (4.72%) [3]
10 Yrs rr_AverageAnnualReturnYear10 4.67% [3]
Class ADV Shares | ING MidCap Opportunities Portfolio
  
Risk/Return: rr_RiskReturnAbstract  
Risk/Return [Heading] rr_RiskReturnHeading

ING MidCap Opportunities Portfolio
Objective [Heading] rr_ObjectiveHeading

INVESTMENT OBJECTIVE
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock The Portfolio seeks long-term capital appreciation.
Expense [Heading] rr_ExpenseHeading

FEES AND EXPENSES OF THE PORTFOLIO
Expense Narrative [Text Block] rr_ExpenseNarrativeTextBlock The table describes the fees and expenses that you may pay if you buy and hold shares of the Portfolio. The table does not reflect fees or expenses that are, or may be, imposed under your variable annuity contracts or variable life insurance policies (“Variable Contract”) or a qualified pension or retirement plan (“Qualified Plan”). For more information on these charges, please refer to the documents governing your Variable Contract or consult your plan administrator.
Operating Expenses: rr_OperatingExpensesAbstract  
Operating Expenses Caption [Text] rr_OperatingExpensesCaption
Annual Portfolio Operating Expenses
Expenses you pay each year as a % of the value of your investment
Fee Waiver or Reimbursement over Assets, Date of Termination rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination May 2, 2013
Portfolio Turnover [Heading] rr_PortfolioTurnoverHeading
Portfolio Turnover % of average value of portfolio
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 transactions costs. These costs, which are not reflected in Annual Portfolio Operating Expenses or in the Expense Example, affect the Portfolio’s performance.

During the most recent fiscal year, the Portfolio’s portfolio turnover rate was 90% of the average value of its portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 90.00%
Expense Example: rr_ExpenseExampleAbstract  
Expense Example [Heading] rr_ExpenseExampleHeading
Expense Example $
Expense Example Narrative [Text Block] rr_ExpenseExampleNarrativeTextBlock The Example is intended to help you compare the cost of investing in shares of the Portfolio with the costs of investing in other mutual funds. The Example does not reflect expenses and charges which are, or may be, imposed under your Variable Contract or Qualified Plan. The Example assumes that you invest $10,000 in the Portfolio for the time periods indicated. The Example also assumes that your investment had a 5% return each year and that the Portfolio’s operating expenses remain the same. Although your actual costs may be higher or lower, based on these assumptions your costs would be:
Expense Example Closing [Text Block] rr_ExpenseExampleClosingTextBlock The Example reflects applicable expense limitation agreements and/or waivers in effect, if any, for the one-year period and the first year of the three-, five-, and ten-year periods.
Strategy [Heading] rr_StrategyHeading

PRINCIPAL INVESTMENT STRATEGIES
Strategy Narrative [Text Block] rr_StrategyNarrativeTextBlock

Under normal market conditions, the Portfolio invests at least 80% of its net assets (plus borrowings for investment purposes) in common stock of mid-sized U.S. companies. The Portfolio will provide shareholders with at least 60 days’ prior notice of any change in this investment policy.

The Portfolio normally invests in companies that the sub-adviser (“Sub-Adviser”) believes have above average prospects for growth. For this Portfolio, mid-sized companies are those companies with market capitalizations that fall within the range of companies in the Russell Midcap® Growth Index at the time of purchase. Capitalization of companies in the Russell Midcap® Growth Index will change with market conditions. The market capitalization of companies in the Russell Midcap® Growth Index as of December 31, 2011, ranged from $117.3 million to $20.5 billion.

The Portfolio may also invest in derivative instruments including futures or index futures that have a similar profile to the benchmark of the Portfolio. The Portfolio typically uses derivatives for the purpose of maintaining equity market exposure on its cash balance. The Portfolio may also invest in foreign securities.

The Portfolio may invest in other investment companies, including exchange-traded funds, to the extent permitted under the Investment Company Act of 1940, as amended, and the rules, regulations, and exemptive orders thereunder (“1940 Act”).

The Sub-Adviser uses a stock selection process that combines the discipline of quantitative screens with rigorous fundamental security analysis. The quantitative screens focus the fundamental analysis by seeking to identify the stocks of companies with strong business momentum that demonstrate relative price strength, and have a perceived value not reflected in the current price. The objective of the fundamental analysis is to confirm the persistence of the company’s revenue and earnings growth and validate the Sub-Adviser’s expectations for earnings estimate revisions, particularly relative to consensus. A determination of reasonable valuation for individual securities is based on the judgment of the Sub-Adviser.

The Sub-Adviser may sell securities for a variety of reasons, such as to secure gains, limit losses, or redeploy assets into opportunities believed to be more promising, among others.

The Portfolio may lend portfolio securities on a short-term or long-term basis, up to 33% of its total assets.
Risk [Heading] rr_RiskHeading

PRINCIPAL RISKS
Risk Narrative [Text Block] rr_RiskNarrativeTextBlock

You could lose money on an investment in the Portfolio. Any of the following risks, among others, could affect Portfolio performance or cause the Portfolio to lose money or to underperform market averages of other funds.

Company The price of a given company’s stock could decline or underperform for many reasons including, among others, poor management, financial problems, or business challenges. If a company declares bankruptcy or becomes insolvent, its stock could become worthless.

Currency To the extent that the Portfolio invests directly in foreign currencies or in securities denominated in, or that trade in, foreign (non-U.S.) currencies, it is subject to the risk that those currencies will decline in value relative to the U.S. dollar or, in the case of hedging positions, that the U.S. dollar will decline in value relative to the currency being hedged.

Derivative Instruments Derivative instruments are subject to a number of risks, including the risk of changes in the market price of the underlying securities, credit risk with respect to the counterparty, risk of loss due to changes in interest rates and liquidity risk. The use of certain derivatives may also have a leveraging effect which may increase the volatility of the Portfolio and reduce its returns.

Foreign Investments Investing in foreign (non-U.S.) securities may result in the Portfolio experiencing more rapid and extreme changes in value than a fund that invests exclusively in securities of U.S. companies due to smaller markets, differing reporting, accounting and auditing standards, and nationalization, expropriation or confiscatory taxation, foreign currency fluctuations, currency blockage or replacement, potential for default on sovereign debt, or political changes or diplomatic developments.

Investment Model The manager’s proprietary model may not adequately allow for existing or unforeseen market factors or the interplay between such factors.

Liquidity If a security is illiquid, the Portfolio might be unable to sell the security at a time when the Portfolio’s manager might wish to sell, and the security could have the effect of decreasing the overall level of the Portfolio’s liquidity. Further, the lack of an established secondary market may make it more difficult to value illiquid securities, which could vary from the amount the Portfolio could realize upon disposition. The Portfolio may make investments that become less liquid in response to market developments or adverse investor perception. The Portfolio could lose money if it cannot sell a security at the time and price that would be most beneficial to the Portfolio.

Market Stock prices may be volatile and are affected by the real or perceived impacts of such factors as economic conditions and political events. The stock market tends to be cyclical, with periods when stock prices generally rise and periods when stock prices generally decline. Any given stock market segment may remain out of favor with investors for a short or long period of time, and stocks as an asset class may underperform bonds or other asset classes during some periods. From time to time, the stock market may not favor the growth-oriented securities in which the Portfolio invests. Rather, the market could favor value-oriented securities or may not favor equities at all.

Mid-Capitalization Company Investments in mid-capitalization companies may involve greater risk than is customarily associated with larger, more established companies due to the greater business risks of smaller size, limited markets and financial resources, narrow product lines and the frequent lack of depth of management. Consequently, the securities of smaller companies may have limited market stability and may be subject to more abrupt or erratic market movements than securities of larger, more established growth companies or the market averages in general.

Other Investment Companies The main risk of investing in other investment companies, including exchange-traded funds, is the risk that the value of the securities underlying an investment company might decrease. Because the Portfolio may invest in other investment companies, you will pay a proportionate share of the expenses of that other investment company (including management fees, administration fees, and custodial fees) in addition to the expenses of the Portfolio.

Securities Lending Securities lending involves two primary risks: “investment risk” and “borrower default risk.” Investment risk is the risk that the Portfolio will lose money from the investment of the cash collateral received from the borrower. Borrower default risk is the risk that the Portfolio will lose money due to the failure of a borrower to return a borrowed security in a timely manner.

An investment in the Portfolio is not a bank deposit and is not insured or guaranteed by the Federal Deposit Insurance Corporation, the Federal Reserve Board or any other government agency.

Risk Lose Money [Text] rr_RiskLoseMoney You could lose money on an investment in the Portfolio.
Risk Not Insured Depository Institution [Text] rr_RiskNotInsuredDepositoryInstitution An investment in the Portfolio is not a bank deposit and is not insured or guaranteed by the Federal Deposit Insurance Corporation, the Federal Reserve Board or any other government agency.
Bar Chart and Performance Table [Heading] rr_BarChartAndPerformanceTableHeading

PERFORMANCE INFORMATION
Performance Narrative [Text Block] rr_PerformanceNarrativeTextBlock The following information is intended to help you understand the risks of investing in the Portfolio. The following bar chart shows the changes in the Portfolio’s Class ADV shares’ and Class I shares’ performance from year to year, and the table compares the Portfolio’s Class ADV shares’ and Class I shares’ performance to the performance of a broad-based securities market index/indices for the same period. Class I shares’ performance has been adjusted to reflect the higher expenses of Class ADV shares. The Class ADV shares and Class I shares of the Portfolio would have substantially similar performance because they invest in the same portfolio of securities. However, Class I shares’ performance would be higher than Class ADV shares’ performance because of the higher expenses paid by Class ADV shares. The Portfolio’s performance information reflects applicable fee waivers and/or expense limitations in effect during the period presented. Absent such fee waivers/expense limitations, if any, performance would have been lower. Performance in the Average Annual Total Returns table does not include insurance-related charges imposed under a Variable Contract or expenses related to a Qualified Plan. If these charges or expenses were included, performance would be lower. Thus, you should not compare the Portfolio’s performance directly with the performance information of other investment products without taking into account all insurance-related charges and expenses payable under your Variable Contract or Qualified Plan. The Portfolio’s past performance is no guarantee of future results.
Performance Information Illustrates Variability of Returns [Text] rr_PerformanceInformationIllustratesVariabilityOfReturns The following bar chart shows the changes in the Portfolio’s Class ADV shares’ and Class I shares’ performance from year to year, and the table compares the Portfolio’s Class ADV shares’ and Class I shares’ performance to the performance of a broad-based securities market index/indices for the same period.
Performance Past Does Not Indicate Future [Text] rr_PerformancePastDoesNotIndicateFuture The Portfolio’s past performance is no guarantee of future results.
Bar Chart Table: rr_BarChartTableAbstract  
Bar Chart [Heading] rr_BarChartHeading
Calendar Year Total Returns
(as of December 31 of each year)
Bar Chart Narrative [Text Block] rr_BarChartNarrativeTextBlock The bar chart below shows the Portfolio’s adjusted Class I shares’ performance (2002-2006) and Class ADV shares’ performance (2007-2011).
Bar Chart Closing [Text Block] rr_BarChartClosingTextBlock Best quarter: 3rd, 2009, 17.68% and Worst quarter: 4th, 2008, (23.49)%
Average Annual Return: rr_AverageAnnualReturnAbstract  
Performance Table Heading rr_PerformanceTableHeading
Average Annual Total Returns%
(for the periods ended December 31, 2011)
Index No Deduction for Fees, Expenses, Taxes [Text] rr_IndexNoDeductionForFeesExpensesTaxes The index returns do not reflect deductions for fees, expenses, or taxes.
Class ADV Shares | ING MidCap Opportunities Portfolio | Class ADV
  
Operating Expenses: rr_OperatingExpensesAbstract  
Management Fee rr_ManagementFeesOverAssets 0.70%
Distribution and/or Shareholder Services (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.50%
Administrative Services Fee rr_Component1OtherExpensesOverAssets 0.10%
Other Expenses rr_OtherExpensesOverAssets 0.04%
Total Annual Portfolio Operating Expenses rr_ExpensesOverAssets 1.34%
Waivers and Reimbursements rr_FeeWaiverOrReimbursementOverAssets none [5]
Total Annual Portfolio Operating Expenses After Waivers and Reimbursements rr_NetExpensesOverAssets 1.34%
Expense Example: rr_ExpenseExampleAbstract  
1 Yr rr_ExpenseExampleYear01 136
3 Yrs rr_ExpenseExampleYear03 425
5 Yrs rr_ExpenseExampleYear05 734
10 Yrs rr_ExpenseExampleYear10 1,613
Bar Chart Table: rr_BarChartTableAbstract  
2007 rr_AnnualReturn2007 25.00%
2008 rr_AnnualReturn2008 (38.04%)
2009 rr_AnnualReturn2009 40.65%
2010 rr_AnnualReturn2010 29.57%
2011 rr_AnnualReturn2011 (1.05%)
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel Best quarter:
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Sep. 30, 2009
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 17.68%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel Worst quarter:
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Dec. 31, 2008
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (23.49%)
Average Annual Return: rr_AverageAnnualReturnAbstract  
1 Yr rr_AverageAnnualReturnYear01 (1.05%)
5 Yrs rr_AverageAnnualReturnYear05 6.91%
10 Yrs rr_AverageAnnualReturnYear10   
Since Inception rr_AverageAnnualReturnSinceInception 6.90%
Inception Date rr_AverageAnnualReturnInceptionDate Dec. 29, 2006
Class ADV Shares | ING MidCap Opportunities Portfolio | Class I
  
Bar Chart Table: rr_BarChartTableAbstract  
2002 rr_AnnualReturn2002 (26.24%)
2003 rr_AnnualReturn2003 36.00%
2004 rr_AnnualReturn2004 10.99%
2005 rr_AnnualReturn2005 9.80%
2006 rr_AnnualReturn2006 7.27%
Average Annual Return: rr_AverageAnnualReturnAbstract  
1 Yr rr_AverageAnnualReturnYear01 (1.01%) [2]
5 Yrs rr_AverageAnnualReturnYear05 7.01% [2]
10 Yrs rr_AverageAnnualReturnYear10 6.29% [2]
Inception Date rr_AverageAnnualReturnInceptionDate May 05, 2000 [2]
Class ADV Shares | ING MidCap Opportunities Portfolio | Russell Midcap Growth Index | Class ADV
  
Average Annual Return: rr_AverageAnnualReturnAbstract  
1 Yr rr_AverageAnnualReturnYear01 (1.65%) [6]
5 Yrs rr_AverageAnnualReturnYear05 2.44% [6]
10 Yrs rr_AverageAnnualReturnYear10    [6]
Since Inception rr_AverageAnnualReturnSinceInception 2.44% [4],[6]
Class ADV Shares | ING MidCap Opportunities Portfolio | Russell Midcap Growth Index | Class I
  
Average Annual Return: rr_AverageAnnualReturnAbstract  
1 Yr rr_AverageAnnualReturnYear01 (1.65%) [6]
5 Yrs rr_AverageAnnualReturnYear05 2.44% [6]
10 Yrs rr_AverageAnnualReturnYear10 5.29% [6]
Class ADV Shares | ING MidCap Opportunities Portfolio | Russell Midcap Index | Class ADV
  
Average Annual Return: rr_AverageAnnualReturnAbstract  
1 Yr rr_AverageAnnualReturnYear01 (1.55%) [6]
5 Yrs rr_AverageAnnualReturnYear05 1.41% [6]
10 Yrs rr_AverageAnnualReturnYear10    [6]
Since Inception rr_AverageAnnualReturnSinceInception 1.41% [4],[6]
Class ADV Shares | ING MidCap Opportunities Portfolio | Russell Midcap Index | Class I
  
Average Annual Return: rr_AverageAnnualReturnAbstract  
1 Yr rr_AverageAnnualReturnYear01 (1.55%) [6]
5 Yrs rr_AverageAnnualReturnYear05 1.41% [6]
10 Yrs rr_AverageAnnualReturnYear10 6.99% [6]
Class ADV Shares | ING SmallCap Opportunities Portfolio
  
Risk/Return: rr_RiskReturnAbstract  
Risk/Return [Heading] rr_RiskReturnHeading

ING SmallCap Opportunities Portfolio
Objective [Heading] rr_ObjectiveHeading

INVESTMENT OBJECTIVE
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock The Portfolio seeks long-term capital appreciation.
Expense [Heading] rr_ExpenseHeading

FEES AND EXPENSES OF THE PORTFOLIO
Expense Narrative [Text Block] rr_ExpenseNarrativeTextBlock The table describes the fees and expenses that you may pay if you buy and hold shares of the Portfolio. The table does not reflect fees or expenses that are, or may be, imposed under your variable annuity contracts or variable life insurance policies (“Variable Contract”) or a qualified pension or retirement plan (“Qualified Plan”). For more information on these charges, please refer to the documents governing your Variable Contract or consult your plan administrator.
Operating Expenses: rr_OperatingExpensesAbstract  
Operating Expenses Caption [Text] rr_OperatingExpensesCaption
Annual Portfolio Operating Expenses
Expenses you pay each year as a % of the value of your investment
Fee Waiver or Reimbursement over Assets, Date of Termination rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination May 1, 2013
Portfolio Turnover [Heading] rr_PortfolioTurnoverHeading
Portfolio Turnover % of average value of portfolio
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 transactions costs. These costs, which are not reflected in Annual Portfolio Operating Expenses or in the Expense Example, affect the Portfolio’s performance.

During the most recent fiscal year, the Portfolio’s portfolio turnover rate was 72% of the average value of its portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 72.00%
Expenses Not Correlated to Ratio Due to Acquired Fund Fees [Text] rr_ExpensesNotCorrelatedToRatioDueToAcquiredFundFees Total Annual Portfolio Operating Expenses may be higher than the Portfolio’s ratio of expenses to average net assets shown in the Portfolio’s Financial Highlights, which reflects the operating expenses of the Portfolio and does not include Acquired Fund Fees and Expenses.
Expense Example: rr_ExpenseExampleAbstract  
Expense Example [Heading] rr_ExpenseExampleHeading
Expense Example $
Expense Example Narrative [Text Block] rr_ExpenseExampleNarrativeTextBlock The Example is intended to help you compare the cost of investing in shares of the Portfolio with the costs of investing in other mutual funds. The Example does not reflect expenses and charges which are, or may be, imposed under your Variable Contract or Qualified Plan. The Example assumes that you invest $10,000 in the Portfolio for the time periods indicated. The Example also assumes that your investment had a 5% return each year and that the Portfolio’s operating expenses remain the same. Although your actual costs may be higher or lower, based on these assumptions your costs would be:
Expense Example Closing [Text Block] rr_ExpenseExampleClosingTextBlock The Example reflects applicable expense limitation agreements and/or waivers in effect, if any, for the one-year period and the first year of the three-, five-, and ten-year periods.
Strategy [Heading] rr_StrategyHeading

PRINCIPAL INVESTMENT STRATEGIES
Strategy Narrative [Text Block] rr_StrategyNarrativeTextBlock

Under normal market conditions, the Portfolio invests at least 80% of its net assets (plus borrowings for investment purposes) in common stock of smaller, lesser-known U.S. companies. The Portfolio will provide shareholders with at least 60 days’ prior notice of any change in this investment policy.

The Portfolio normally invests in companies that the sub-adviser (“Sub-Adviser”) believes have above average prospects for growth. For this Portfolio, smaller companies are those with market capitalizations that fall within the range of companies in the Russell 2000® Growth Index at the time of purchase. The Russell 2000® Growth Index is an index that measures the performance of small growth companies. Capitalization of companies in the Russell 2000® Growth Index will change with market conditions. The market capitalization of companies in the Russell 2000® Growth Index as of December 31, 2011, ranged from $23.4 million to $3.7 billion.

The Portfolio may invest in other investment companies, including exchange-traded funds, to the extent permitted under the Investment Company Act of 1940, as amended, and the rules, regulations, and exemptive orders thereunder (“1940 Act”).

The Sub-Adviser uses a disciplined combination of quantitative screens and bottom-up fundamental security analysis to build a broadly diversified portfolio of companies that the Sub-Adviser believes will have improving bottom lines, with reasonable valuation, and whose stocks demonstrate relative strength. The focus of company analysis is upon the prospects for continuing bottom-line growth, balance sheet strength, and cash flow characteristics. A proprietary measure is used to determine relative stock price strength. A determination of reasonable valuation for individual securities is based on the judgment of the Sub-Adviser.

The Sub-Adviser may sell securities for a variety of reasons, such as to secure gains, limit losses, or redeploy assets into opportunities believed to be more promising, among others.

The Portfolio may lend portfolio securities on a short-term or long-term basis, up to 33% of its total assets.
Risk [Heading] rr_RiskHeading

PRINCIPAL RISKS
Risk Narrative [Text Block] rr_RiskNarrativeTextBlock

You could lose money on an investment in the Portfolio. Any of the following risks, among others, could affect Portfolio performance or cause the Portfolio to lose money or to underperform market averages of other funds.

Company The price of a given company’s stock could decline or underperform for many reasons including, among others, poor management, financial problems, or business challenges. If a company declares bankruptcy or becomes insolvent, its stock could become worthless.

Investment Model The manager’s proprietary model may not adequately allow for existing or unforeseen market factors or the interplay between such factors.

Liquidity If a security is illiquid, the Portfolio might be unable to sell the security at a time when the Portfolio’s manager might wish to sell, and the security could have the effect of decreasing the overall level of the Portfolio’s liquidity. Further, the lack of an established secondary market may make it more difficult to value illiquid securities, which could vary from the amount the Portfolio could realize upon disposition. The Portfolio may make investments that become less liquid in response to market developments or adverse investor perception. The Portfolio could lose money if it cannot sell a security at the time and price that would be most beneficial to the Portfolio.

Market Stock prices may be volatile and are affected by the real or perceived impacts of such factors as economic conditions and political events. The stock market tends to be cyclical, with periods when stock prices generally rise and periods when stock prices generally decline. Any given stock market segment may remain out of favor with investors for a short or long period of time, and stocks as an asset class may underperform bonds or other asset classes during some periods. From time to time, the stock market may not favor the growth-oriented securities in which the Portfolio invests. Rather, the market could favor value-oriented securities or may not favor equities at all.

Other Investment Companies The main risk of investing in other investment companies, including exchange-traded funds, is the risk that the value of the securities underlying an investment company might decrease. Because the Portfolio may invest in other investment companies, you will pay a proportionate share of the expenses of that other investment company (including management fees, administration fees, and custodial fees) in addition to the expenses of the Portfolio.

Securities Lending Securities lending involves two primary risks: “investment risk” and “borrower default risk.” Investment risk is the risk that the Portfolio will lose money from the investment of the cash collateral received from the borrower. Borrower default risk is the risk that the Portfolio will lose money due to the failure of a borrower to return a borrowed security in a timely manner.

Small-Capitalization Company Investments in small-capitalization companies may involve greater risk than is customarily associated with larger, more established companies due to the greater business risks of small size, limited markets and financial resources, narrow product lines and the frequent lack of depth of management. The securities of smaller companies are often traded over-the-counter and may not be traded in volume typical on a national securities exchange.

An investment in the Portfolio is not a bank deposit and is not insured or guaranteed by the Federal Deposit Insurance Corporation, the Federal Reserve Board or any other government agency.

Risk Lose Money [Text] rr_RiskLoseMoney You could lose money on an investment in the Portfolio.
Risk Not Insured Depository Institution [Text] rr_RiskNotInsuredDepositoryInstitution An investment in the Portfolio is not a bank deposit and is not insured or guaranteed by the Federal Deposit Insurance Corporation, the Federal Reserve Board or any other government agency.
Bar Chart and Performance Table [Heading] rr_BarChartAndPerformanceTableHeading

PERFORMANCE INFORMATION
Performance Narrative [Text Block] rr_PerformanceNarrativeTextBlock The following information is intended to help you understand the risks of investing in the Portfolio. The following bar chart shows the changes in the Portfolio’s Class ADV shares’ and Class I shares’ performance from year to year, and the table compares the Portfolio’s Class ADV shares’ and Class I shares’ performance to the performance of a broad-based securities market index/indices for the same period. Class I shares’ performance has been adjusted to reflect the higher expenses of Class ADV shares. The Class ADV shares and Class I shares of the Portfolio would have substantially similar performance because they invest in the same portfolio of securities. However, Class I shares’ performance would be higher than Class ADV shares’ performance because of the higher expenses paid by Class ADV shares. The Portfolio’s performance information reflects applicable fee waivers and/or expense limitations in effect during the period presented. Absent such fee waivers/expense limitations, if any, performance would have been lower. Performance in the Average Annual Total Returns table does not include insurance-related charges imposed under a Variable Contract or expenses related to a Qualified Plan. If these charges or expenses were included, performance would be lower. Thus, you should not compare the Portfolio’s performance directly with the performance information of other investment products without taking into account all insurance-related charges and expenses payable under your Variable Contract or Qualified Plan. The Portfolio’s past performance is no guarantee of future results.
Performance Information Illustrates Variability of Returns [Text] rr_PerformanceInformationIllustratesVariabilityOfReturns The following bar chart shows the changes in the Portfolio’s Class ADV shares’ and Class I shares’ performance from year to year, and the table compares the Portfolio’s Class ADV shares’ and Class I shares’ performance to the performance of a broad-based securities market index/indices for the same period.
Performance Past Does Not Indicate Future [Text] rr_PerformancePastDoesNotIndicateFuture The Portfolio’s past performance is no guarantee of future results.
Bar Chart Table: rr_BarChartTableAbstract  
Bar Chart [Heading] rr_BarChartHeading
Calendar Year Total Returns
(as of December 31 of each year)
Bar Chart Narrative [Text Block] rr_BarChartNarrativeTextBlock The bar chart below shows the Portfolio’s adjusted Class I shares’ performance (2002-2008) and Class ADV shares’ performance (2009-2011).
Bar Chart Closing [Text Block] rr_BarChartClosingTextBlock Best quarter: 2nd, 2009, 22.52% and Worst quarter: 4th, 2008, (25.38)%
Average Annual Return: rr_AverageAnnualReturnAbstract  
Performance Table Heading rr_PerformanceTableHeading
Average Annual Total Returns%
(for the periods ended December 31, 2011)
Index No Deduction for Fees, Expenses, Taxes [Text] rr_IndexNoDeductionForFeesExpensesTaxes The index returns do not reflect deductions for fees, expenses, or taxes.
Class ADV Shares | ING SmallCap Opportunities Portfolio | Class ADV
  
Operating Expenses: rr_OperatingExpensesAbstract  
Management Fee rr_ManagementFeesOverAssets 0.75%
Distribution and/or Shareholder Services (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.50%
Administrative Services Fee rr_Component1OtherExpensesOverAssets 0.10%
Other Expenses rr_OtherExpensesOverAssets 0.05%
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.01%
Total Annual Portfolio Operating Expenses rr_ExpensesOverAssets 1.41% [7]
Waivers and Reimbursements rr_FeeWaiverOrReimbursementOverAssets none [8]
Total Annual Portfolio Operating Expenses After Waivers and Reimbursements rr_NetExpensesOverAssets 1.41%
Expense Example: rr_ExpenseExampleAbstract  
1 Yr rr_ExpenseExampleYear01 144
3 Yrs rr_ExpenseExampleYear03 446
5 Yrs rr_ExpenseExampleYear05 771
10 Yrs rr_ExpenseExampleYear10 1,691
Bar Chart Table: rr_BarChartTableAbstract  
2009 rr_AnnualReturn2009 30.32%
2010 rr_AnnualReturn2010 31.74%
2011 rr_AnnualReturn2011 0.29%
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel Best quarter:
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Jun. 30, 2009
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 22.52%
Average Annual Return: rr_AverageAnnualReturnAbstract  
1 Yr rr_AverageAnnualReturnYear01 0.29%
5 Yrs rr_AverageAnnualReturnYear05   
10 Yrs rr_AverageAnnualReturnYear10   
Since Inception rr_AverageAnnualReturnSinceInception 27.93%
Inception Date rr_AverageAnnualReturnInceptionDate Nov. 20, 2008
Class ADV Shares | ING SmallCap Opportunities Portfolio | Class I
  
Bar Chart Table: rr_BarChartTableAbstract  
2002 rr_AnnualReturn2002 (43.94%)
2003 rr_AnnualReturn2003 38.05%
2004 rr_AnnualReturn2004 9.62%
2005 rr_AnnualReturn2005 8.58%
2006 rr_AnnualReturn2006 12.02%
2007 rr_AnnualReturn2007 9.54%
2008 rr_AnnualReturn2008 (34.82%)
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel Worst quarter:
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Dec. 31, 2008
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (25.38%)
Average Annual Return: rr_AverageAnnualReturnAbstract  
1 Yr rr_AverageAnnualReturnYear01 0.32% [2]
5 Yrs rr_AverageAnnualReturnYear05 4.22% [2]
10 Yrs rr_AverageAnnualReturnYear10 2.41% [2]
Inception Date rr_AverageAnnualReturnInceptionDate May 06, 1994 [2]
Class ADV Shares | ING SmallCap Opportunities Portfolio | Russell 2000 Growth Index | Class ADV
  
Average Annual Return: rr_AverageAnnualReturnAbstract  
1 Yr rr_AverageAnnualReturnYear01 (2.91%) [6]
5 Yrs rr_AverageAnnualReturnYear05    [6]
10 Yrs rr_AverageAnnualReturnYear10    [6]
Since Inception rr_AverageAnnualReturnSinceInception 20.49% [4],[6]
Class ADV Shares | ING SmallCap Opportunities Portfolio | Russell 2000 Growth Index | Class I
  
Average Annual Return: rr_AverageAnnualReturnAbstract  
1 Yr rr_AverageAnnualReturnYear01 (2.91%) [6]
5 Yrs rr_AverageAnnualReturnYear05 2.09% [6]
10 Yrs rr_AverageAnnualReturnYear10 4.48% [6]
Class ADV Shares | ING SmallCap Opportunities Portfolio | Russell 2000 Index | Class ADV
  
Average Annual Return: rr_AverageAnnualReturnAbstract  
1 Yr rr_AverageAnnualReturnYear01 (4.18%) [6]
5 Yrs rr_AverageAnnualReturnYear05    [6]
10 Yrs rr_AverageAnnualReturnYear10    [6]
Since Inception rr_AverageAnnualReturnSinceInception 17.30% [4],[6]
Class ADV Shares | ING SmallCap Opportunities Portfolio | Russell 2000 Index | Class I
  
Average Annual Return: rr_AverageAnnualReturnAbstract  
1 Yr rr_AverageAnnualReturnYear01 (4.18%) [6]
5 Yrs rr_AverageAnnualReturnYear05 0.15% [6]
10 Yrs rr_AverageAnnualReturnYear10 5.62% [6]
Class I Shares | ING International Value Portfolio
  
Risk/Return: rr_RiskReturnAbstract  
Risk/Return [Heading] rr_RiskReturnHeading

ING International Value Portfolio
Objective [Heading] rr_ObjectiveHeading

INVESTMENT OBJECTIVE
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock The Portfolio seeks long-term capital appreciation.
Expense [Heading] rr_ExpenseHeading

FEES AND EXPENSES OF THE PORTFOLIO
Expense Narrative [Text Block] rr_ExpenseNarrativeTextBlock The table describes the fees and expenses that you may pay if you buy and hold shares of the Portfolio. The table does not reflect fees or expenses that are, or may be, imposed under your variable annuity contracts or variable life insurance policies (“Variable Contract”) or a qualified pension or retirement plan (“Qualified Plan”). For more information on these charges, please refer to the documents governing your Variable Contract or consult your plan administrator.
Operating Expenses: rr_OperatingExpensesAbstract  
Operating Expenses Caption [Text] rr_OperatingExpensesCaption
Annual Portfolio Operating Expenses
Expenses you pay each year as a % of the value of your investment
Fee Waiver or Reimbursement over Assets, Date of Termination rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination May 1, 2013
Portfolio Turnover [Heading] rr_PortfolioTurnoverHeading
Portfolio Turnover % of average value of portfolio
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 transactions costs. These costs, which are not reflected in Annual Portfolio Operating Expenses or in the Expense Example, affect the Portfolio’s performance.

During the most recent fiscal year, the Portfolio’s portfolio turnover rate was 69% of the average value of its portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 69.00%
Expense Example: rr_ExpenseExampleAbstract  
Expense Example [Heading] rr_ExpenseExampleHeading
Expense Example $
Expense Example Narrative [Text Block] rr_ExpenseExampleNarrativeTextBlock The Example is intended to help you compare the cost of investing in shares of the Portfolio with the costs of investing in other mutual funds. The Example does not reflect expenses and charges which are, or may be, imposed under your Variable Contract or Qualified Plan. The Example assumes that you invest $10,000 in the Portfolio for the time periods indicated. The Example also assumes that your investment had a 5% return each year and that the Portfolio’s operating expenses remain the same. Although your actual costs may be higher or lower, based on these assumptions your costs would be:
Expense Example Closing [Text Block] rr_ExpenseExampleClosingTextBlock The Example reflects applicable expense limitation agreements and/or waivers in effect, if any, for the one-year period and the first year of the three-, five-, and ten-year periods.
Strategy [Heading] rr_StrategyHeading

PRINCIPAL INVESTMENT STRATEGIES
Strategy Narrative [Text Block] rr_StrategyNarrativeTextBlock

Under normal market conditions, the Portfolio invests at least 65% of its net assets in equity securities of companies located in a number of different countries outside of the United States. The Portfolio invests primarily in companies with a large market capitalization, but may also invest in small- and mid-sized companies. The Portfolio generally invests in common and preferred stocks, warrants, and convertible securities. The Portfolio may invest in companies located in countries with emerging securities markets when the sub-adviser (“Sub-Adviser”) believes they present attractive investment opportunities. The Portfolio may invest in government debt securities of developed foreign countries. The Portfolio may also invest up to 35% of its assets in securities of U.S. issuers, including investment-grade government and corporate debt securities.

The Portfolio may invest in derivative instruments including futures, options, and swaps. The Portfolio typically uses derivatives to hedge against currency risk and for purposes of maintaining equity market exposure on its cash balance.

The Portfolio may invest in other investment companies, including exchange-traded funds, to the extent permitted under the Investment Company Act of 1940, as amended, and the rules, regulations, and exemptive orders thereunder (“1940 Act”).

The Sub-Adviser primarily uses a bottom-up fundamental analysis to identify stocks which it believes offer good value relative to their peers in the same industry, sector, or region. It also uses a top-down analysis to identify important themes or issues which may affect the investment environment in certain regions or sectors and to estimate regional market risks. In conducting its fundamental analysis, the Sub-Adviser focuses on various factors including valuation of the companies, catalysts to stock price appreciation, quality of management, and financial measures, especially cash flow and cash flow return on capital.

The Sub-Adviser may sell securities for a variety of reasons, such as to secure gains, limit losses, or redeploy assets into opportunities believed to be more promising, among others.

The Portfolio may lend portfolio securities on a short-term or long-term basis, up to 331/3 % of its total assets.
Risk [Heading] rr_RiskHeading

PRINCIPAL RISKS
Risk Narrative [Text Block] rr_RiskNarrativeTextBlock

You could lose money on an investment in the Portfolio. Any of the following risks, among others, could affect Portfolio performance or cause the Portfolio to lose money or to underperform market averages of other funds.

Company The price of a given company’s stock could decline or underperform for many reasons including, among others, poor management, financial problems, or business challenges. If a company declares bankruptcy or becomes insolvent, its stock could become worthless.

Convertible Securities Convertible securities are securities that are convertible into or exercisable for common stocks at a stated price or rate. Convertible securities are subject to the usual risks associated with debt securities, such as interest rate and credit risk. In addition, because convertible securities react to changes in the value of the stocks into which they convert, they are subject to market risk.

Credit Prices of bonds and other debt securities can fall if the issuer’s actual or perceived financial health deteriorates, whether because of broad economic or issuer-specific reasons. In certain cases, the issuer could be late in paying interest or principal, or could fail to pay altogether.

Currency To the extent that the Portfolio invests directly in foreign currencies or in securities denominated in, or that trade in, foreign (non-U.S.) currencies, it is subject to the risk that those currencies will decline in value relative to the U.S. dollar or, in the case of hedging positions, that the U.S. dollar will decline in value relative to the currency being hedged.

Derivative Instruments Derivative instruments are subject to a number of risks, including the risk of changes in the market price of the underlying securities, credit risk with respect to the counterparty, risk of loss due to changes in interest rates and liquidity risk. The use of certain derivatives may also have a leveraging effect which may increase the volatility of the Portfolio and reduce its returns.

Foreign Investments/Developing and Emerging Markets Investing in foreign (non-U.S.) securities may result in the Portfolio experiencing more rapid and extreme changes in value than a fund that invests exclusively in securities of U.S. companies, due to smaller markets, differing reporting, accounting and auditing standards, and nationalization, expropriation or confiscatory taxation, foreign currency fluctuations, currency blockage, or replacement, potential for default on sovereign debt, or political changes or diplomatic developments. Foreign investment risks may be greater in developing and emerging markets than in developed markets.

Interest Rate With bonds and other fixed rate debt securities, a rise in interest rates generally causes values to fall; conversely, values generally rise as interest rates fall. The higher the credit quality of the security, and the longer its maturity or duration, the more sensitive it is likely to be to interest rate risk.

Liquidity If a security is illiquid, the Portfolio might be unable to sell the security at a time when the Portfolio’s manager might wish to sell, and the security could have the effect of decreasing the overall level of the Portfolio’s liquidity. Further, the lack of an established secondary market may make it more difficult to value illiquid securities, which could vary from the amount the Portfolio could realize upon disposition. The Portfolio may make investments that become less liquid in response to market developments or adverse investor perception. The Portfolio could lose money if it cannot sell a security at the time and price that would be most beneficial to the Portfolio.

Market Stock prices may be volatile and are affected by the real or perceived impacts of such factors as economic conditions and political events. The stock market tends to be cyclical, with periods when stock prices generally rise and periods when stock prices generally decline. Any given stock market segment may remain out of favor with investors for a short or long period of time, and stocks as an asset class may underperform bonds or other asset classes during some periods. From time to time, the stock market may not favor the value-oriented securities in which the Portfolio invests. Rather, the market could favor growth-oriented securities or may not favor equities at all.

Market Capitalization Stocks fall into three broad market capitalization categories - large, mid, and small. Investing primarily in one category carries the risk that, due to current market conditions, that category may be out of favor with investors. If valuations of large-capitalization companies appear to be greatly out of proportion to the valuations of mid- or small-capitalization companies, investors may migrate to the stocks of mid- and small-sized companies causing the Portfolio that invests in these companies to increase in value more rapidly than a fund that invests in larger, fully-valued companies. Investing in mid- and small-capitalization companies may be subject to special risks associated with narrower product lines, more limited financial resources, smaller management groups, and a more limited trading market for their stocks as compared with larger companies. As a result, stocks of mid- and small-capitalization companies may decline significantly in market downturns.

Other Investment Companies The main risk of investing in other investment companies, including exchange-traded funds, is the risk that the value of the securities underlying an investment company might decrease. Because the Portfolio may invest in other investment companies, you will pay a proportionate share of the expenses of that other investment company (including management fees, administration fees, and custodial fees) in addition to the expenses of the Portfolio.

Securities Lending Securities lending involves two primary risks: “investment risk” and “borrower default risk.” Investment risk is the risk that the Portfolio will lose money from the investment of the cash collateral received from the borrower. Borrower default risk is the risk that the Portfolio will lose money due to the failure of a borrower to return a borrowed security in a timely manner.

Sovereign Debt These securities are issued or guaranteed by foreign government entities. Investments in sovereign debt are subject to the risk that a government entity may delay payment, restructure its debt, or refuse to pay interest or repay principal on its sovereign debt. Some of these reasons may include cash flow problems, insufficient foreign currency reserves, political considerations, the relative size of its debt position to its economy or its failure to put in place economic reforms required by the International Monetary Fund or other multilateral agencies. If a government entity defaults, it may ask for more time in which to pay or for further loans. There is no legal process for collecting sovereign debts that a government does not pay or bankruptcy proceeding by which all or part of sovereign debt that a government entity has not repaid may be collected.

U.S. Government Securities and Obligations U.S. government securities are obligations of, or guaranteed by, the U.S. government, its agencies or government-sponsored enterprises. U.S. government securities are subject to market and interest rate risk, and may be subject to varying degrees of credit risk.

Value Investing Securities that appear to be undervalued may never appreciate to the extent expected. Further, because the prices of value-oriented securities tend to correlate more closely with economic cycles than growth-oriented securities, they generally are more sensitive to changing economic conditions, such as changes in interest rates, corporate earnings and industrial production.

An investment in the Portfolio is not a bank deposit and is not insured or guaranteed by the Federal Deposit Insurance Corporation, the Federal Reserve Board or any other government agency.
Risk Lose Money [Text] rr_RiskLoseMoney You could lose money on an investment in the Portfolio.
Risk Not Insured Depository Institution [Text] rr_RiskNotInsuredDepositoryInstitution An investment in the Portfolio is not a bank deposit and is not insured or guaranteed by the Federal Deposit Insurance Corporation, the Federal Reserve Board or any other government agency.
Bar Chart and Performance Table [Heading] rr_BarChartAndPerformanceTableHeading

PERFORMANCE INFORMATION
Performance Narrative [Text Block] rr_PerformanceNarrativeTextBlock The following information is intended to help you understand the risks of investing in the Portfolio. The following bar chart shows the changes in the Portfolio’s Class I shares’ performance from year to year, and the table compares the Portfolio’s Class I shares’ performance to the performance of a broad-based securities market index/indices for the same period. The Portfolio’s performance information reflects applicable fee waivers and/or expense limitations in effect during the period presented. Absent such fee waivers/expense limitations, if any, performance would have been lower. Performance in the Average Annual Total Returns table does not include insurance-related charges imposed under a Variable Contract or expenses related to a Qualified Plan. If these charges or expenses were included, performance would be lower. Thus, you should not compare the Portfolio’s performance directly with the performance information of other investment products without taking into account all insurance-related charges and expenses payable under your Variable Contract or Qualified Plan. The Portfolio’s past performance is no guarantee of future results.
Performance Information Illustrates Variability of Returns [Text] rr_PerformanceInformationIllustratesVariabilityOfReturns The following bar chart shows the changes in the Portfolio’s Class I shares’ performance from year to year, and the table compares the Portfolio’s Class I shares’ performance to the performance of a broad-based securities market index/indices for the same period.
Performance Past Does Not Indicate Future [Text] rr_PerformancePastDoesNotIndicateFuture The Portfolio’s past performance is no guarantee of future results.
Bar Chart Table: rr_BarChartTableAbstract  
Bar Chart [Heading] rr_BarChartHeading
Calendar Year Total Returns
(as of December 31 of each year)
Bar Chart Closing [Text Block] rr_BarChartClosingTextBlock Best quarter: 2nd, 2009, 26.86% and Worst quarter: 3rd, 2011, (22.78)%
Average Annual Return: rr_AverageAnnualReturnAbstract  
Performance Table Heading rr_PerformanceTableHeading
Average Annual Total Returns%
(for the periods ended December 31, 2011)
Index No Deduction for Fees, Expenses, Taxes [Text] rr_IndexNoDeductionForFeesExpensesTaxes The index returns include the reinvestment of dividends and distributions net of withholding taxes, but do not reflect fees, brokerage commissions, or other expenses.
Class I Shares | ING International Value Portfolio | Class I
  
Operating Expenses: rr_OperatingExpensesAbstract  
Management Fee rr_ManagementFeesOverAssets 0.80%
Distribution and/or Shareholder Services (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Administrative Services Fee rr_Component1OtherExpensesOverAssets 0.10%
Other Expenses rr_OtherExpensesOverAssets 0.16%
Total Annual Portfolio Operating Expenses rr_ExpensesOverAssets 1.06%
Waivers and Reimbursements rr_FeeWaiverOrReimbursementOverAssets (0.05%) [9]
Total Annual Portfolio Operating Expenses After Waivers and Reimbursements rr_NetExpensesOverAssets 1.01%
Expense Example: rr_ExpenseExampleAbstract  
1 Yr rr_ExpenseExampleYear01 103
3 Yrs rr_ExpenseExampleYear03 332
5 Yrs rr_ExpenseExampleYear05 580
10 Yrs rr_ExpenseExampleYear10 1,290
Bar Chart Table: rr_BarChartTableAbstract  
2002 rr_AnnualReturn2002 (15.46%)
2003 rr_AnnualReturn2003 29.92%
2004 rr_AnnualReturn2004 17.41%
2005 rr_AnnualReturn2005 9.43%
2006 rr_AnnualReturn2006 29.44%
2007 rr_AnnualReturn2007 13.44%
2008 rr_AnnualReturn2008 (42.76%)
2009 rr_AnnualReturn2009 27.18%
2010 rr_AnnualReturn2010 2.50%
2011 rr_AnnualReturn2011 (14.96%)
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel Best quarter:
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Jun. 30, 2009
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 26.86%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel Worst quarter:
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Sep. 30, 2011
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (22.78%)
Average Annual Return: rr_AverageAnnualReturnAbstract  
1 Yr rr_AverageAnnualReturnYear01 (14.96%)
5 Yrs rr_AverageAnnualReturnYear05 (6.36%)
10 Yrs rr_AverageAnnualReturnYear10 2.77%
Inception Date rr_AverageAnnualReturnInceptionDate Aug. 08, 1997
Class I Shares | ING International Value Portfolio | MSCI EAFE Index
  
Average Annual Return: rr_AverageAnnualReturnAbstract  
1 Yr rr_AverageAnnualReturnYear01 (12.14%) [3]
5 Yrs rr_AverageAnnualReturnYear05 (4.72%) [3]
10 Yrs rr_AverageAnnualReturnYear10 4.67% [3]
Class I Shares | ING MidCap Opportunities Portfolio
  
Risk/Return: rr_RiskReturnAbstract  
Risk/Return [Heading] rr_RiskReturnHeading

ING MidCap Opportunities Portfolio
Objective [Heading] rr_ObjectiveHeading

INVESTMENT OBJECTIVE
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock The Portfolio seeks long-term capital appreciation.
Expense [Heading] rr_ExpenseHeading

FEES AND EXPENSES OF THE PORTFOLIO
Expense Narrative [Text Block] rr_ExpenseNarrativeTextBlock The table describes the fees and expenses that you may pay if you buy and hold shares of the Portfolio. The table does not reflect fees or expenses that are, or may be, imposed under your variable annuity contracts or variable life insurance policies (“Variable Contract”) or a qualified pension or retirement plan (“Qualified Plan”). For more information on these charges, please refer to the documents governing your Variable Contract or consult your plan administrator.
Operating Expenses: rr_OperatingExpensesAbstract  
Operating Expenses Caption [Text] rr_OperatingExpensesCaption
Annual Portfolio Operating Expenses
Expenses you pay each year as a % of the value of your investment
Fee Waiver or Reimbursement over Assets, Date of Termination rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination May 2, 2013
Portfolio Turnover [Heading] rr_PortfolioTurnoverHeading
Portfolio Turnover % of average value of portfolio
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 transactions costs. These costs, which are not reflected in Annual Portfolio Operating Expenses or in the Expense Example, affect the Portfolio’s performance.

During the most recent fiscal year, the Portfolio’s portfolio turnover rate was 90% of the average value of its portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 90.00%
Expense Example: rr_ExpenseExampleAbstract  
Expense Example [Heading] rr_ExpenseExampleHeading
Expense Example $
Expense Example Narrative [Text Block] rr_ExpenseExampleNarrativeTextBlock The Example is intended to help you compare the cost of investing in shares of the Portfolio with the costs of investing in other mutual funds. The Example does not reflect expenses and charges which are, or may be, imposed under your Variable Contract or Qualified Plan. The Example assumes that you invest $10,000 in the Portfolio for the time periods indicated. The Example also assumes that your investment had a 5% return each year and that the Portfolio’s operating expenses remain the same. Although your actual costs may be higher or lower, based on these assumptions your costs would be:
Expense Example Closing [Text Block] rr_ExpenseExampleClosingTextBlock The Example reflects applicable expense limitation agreements and/or waivers in effect, if any, for the one-year period and the first year of the three-, five-, and ten-year periods.
Strategy [Heading] rr_StrategyHeading

PRINCIPAL INVESTMENT STRATEGIES
Strategy Narrative [Text Block] rr_StrategyNarrativeTextBlock

Under normal market conditions, the Portfolio invests at least 80% of its net assets (plus borrowings for investment purposes) in common stock of mid-sized U.S. companies. The Portfolio will provide shareholders with at least 60 days’ prior notice of any change in this investment policy.

The Portfolio normally invests in companies that the sub-adviser (“Sub-Adviser”) believes have above average prospects for growth. For this Portfolio, mid-sized companies are those companies with market capitalizations that fall within the range of companies in the Russell Midcap® Growth Index at the time of purchase. Capitalization of companies in the Russell Midcap® Growth Index will change with market conditions. The market capitalization of companies in the Russell Midcap® Growth Index as of December 31, 2011, ranged from $117.3 million to $20.5 billion.

The Portfolio may also invest in derivative instruments including futures or index futures that have a similar profile to the benchmark of the Portfolio. The Portfolio typically uses derivatives for the purpose of maintaining equity market exposure on its cash balance. The Portfolio may also invest in foreign securities.

The Portfolio may invest in other investment companies, including exchange-traded funds, to the extent permitted under the Investment Company Act of 1940, as amended, and the rules, regulations, and exemptive orders thereunder (“1940 Act”).

The Sub-Adviser uses a stock selection process that combines the discipline of quantitative screens with rigorous fundamental security analysis. The quantitative screens focus the fundamental analysis by seeking to identify the stocks of companies with strong business momentum that demonstrate relative price strength, and have a perceived value not reflected in the current price. The objective of the fundamental analysis is to confirm the persistence of the company’s revenue and earnings growth and validate the Sub-Adviser’s expectations for earnings estimate revisions, particularly relative to consensus. A determination of reasonable valuation for individual securities is based on the judgment of the Sub-Adviser.

The Sub-Adviser may sell securities for a variety of reasons, such as to secure gains, limit losses, or redeploy assets into opportunities believed to be more promising, among others.

The Portfolio may lend portfolio securities on a short-term or long-term basis, up to 33% of its total assets.
Risk [Heading] rr_RiskHeading

PRINCIPAL RISKS
Risk Narrative [Text Block] rr_RiskNarrativeTextBlock

You could lose money on an investment in the Portfolio. Any of the following risks, among others, could affect Portfolio performance or cause the Portfolio to lose money or to underperform market averages of other funds.

Company The price of a given company’s stock could decline or underperform for many reasons including, among others, poor management, financial problems, or business challenges. If a company declares bankruptcy or becomes insolvent, its stock could become worthless.

Currency To the extent that the Portfolio invests directly in foreign currencies or in securities denominated in, or that trade in, foreign (non-U.S.) currencies, it is subject to the risk that those currencies will decline in value relative to the U.S. dollar or, in the case of hedging positions, that the U.S. dollar will decline in value relative to the currency being hedged.

Derivative Instruments Derivative instruments are subject to a number of risks, including the risk of changes in the market price of the underlying securities, credit risk with respect to the counterparty, risk of loss due to changes in interest rates and liquidity risk. The use of certain derivatives may also have a leveraging effect which may increase the volatility of the Portfolio and reduce its returns.

Foreign Investments Investing in foreign (non-U.S.) securities may result in the Portfolio experiencing more rapid and extreme changes in value than a fund that invests exclusively in securities of U.S. companies due to smaller markets, differing reporting, accounting and auditing standards, and nationalization, expropriation or confiscatory taxation, foreign currency fluctuations, currency blockage or replacement, potential for default on sovereign debt, or political changes or diplomatic developments.

Investment Model The manager’s proprietary model may not adequately allow for existing or unforeseen market factors or the interplay between such factors.

Liquidity If a security is illiquid, the Portfolio might be unable to sell the security at a time when the Portfolio’s manager might wish to sell, and the security could have the effect of decreasing the overall level of the Portfolio’s liquidity. Further, the lack of an established secondary market may make it more difficult to value illiquid securities, which could vary from the amount the Portfolio could realize upon disposition. The Portfolio may make investments that become less liquid in response to market developments or adverse investor perception. The Portfolio could lose money if it cannot sell a security at the time and price that would be most beneficial to the Portfolio.

Market Stock prices may be volatile and are affected by the real or perceived impacts of such factors as economic conditions and political events. The stock market tends to be cyclical, with periods when stock prices generally rise and periods when stock prices generally decline. Any given stock market segment may remain out of favor with investors for a short or long period of time, and stocks as an asset class may underperform bonds or other asset classes during some periods. From time to time, the stock market may not favor the growth-oriented securities in which the Portfolio invests. Rather, the market could favor value-oriented securities or may not favor equities at all.

Mid-Capitalization Company Investments in mid-capitalization companies may involve greater risk than is customarily associated with larger, more established companies due to the greater business risks of smaller size, limited markets and financial resources, narrow product lines and the frequent lack of depth of management. Consequently, the securities of smaller companies may have limited market stability and may be subject to more abrupt or erratic market movements than securities of larger, more established growth companies or the market averages in general.

Other Investment Companies The main risk of investing in other investment companies, including exchange-traded funds, is the risk that the value of the securities underlying an investment company might decrease. Because the Portfolio may invest in other investment companies, you will pay a proportionate share of the expenses of that other investment company (including management fees, administration fees, and custodial fees) in addition to the expenses of the Portfolio.

Securities Lending Securities lending involves two primary risks: “investment risk” and “borrower default risk.” Investment risk is the risk that the Portfolio will lose money from the investment of the cash collateral received from the borrower. Borrower default risk is the risk that the Portfolio will lose money due to the failure of a borrower to return a borrowed security in a timely manner.

An investment in the Portfolio is not a bank deposit and is not insured or guaranteed by the Federal Deposit Insurance Corporation, the Federal Reserve Board or any other government agency.
Risk Lose Money [Text] rr_RiskLoseMoney You could lose money on an investment in the Portfolio.
Risk Not Insured Depository Institution [Text] rr_RiskNotInsuredDepositoryInstitution An investment in the Portfolio is not a bank deposit and is not insured or guaranteed by the Federal Deposit Insurance Corporation, the Federal Reserve Board or any other government agency.
Bar Chart and Performance Table [Heading] rr_BarChartAndPerformanceTableHeading

PERFORMANCE INFORMATION
Performance Narrative [Text Block] rr_PerformanceNarrativeTextBlock The following information is intended to help you understand the risks of investing in the Portfolio. The following bar chart shows the changes in the Portfolio’s Class I shares’ performance from year to year, and the table compares the Portfolio’s Class I shares’ performance to the performance of a broad-based securities market index/indices for the same period. The Portfolio’s performance information reflects applicable fee waivers and/or expense limitations in effect during the period presented. Absent such fee waivers/expense limitations, if any, performance would have been lower. Performance in the Average Annual Total Returns table does not include insurance-related charges imposed under a Variable Contract or expenses related to a Qualified Plan. If these charges or expenses were included, performance would be lower. Thus, you should not compare the Portfolio’s performance directly with the performance information of other investment products without taking into account all insurance-related charges and expenses payable under your Variable Contract or Qualified Plan. The Portfolio’s past performance is no guarantee of future results.
Performance Information Illustrates Variability of Returns [Text] rr_PerformanceInformationIllustratesVariabilityOfReturns The following bar chart shows the changes in the Portfolio’s Class I shares’ performance from year to year, and the table compares the Portfolio’s Class I shares’ performance to the performance of a broad-based securities market index/indices for the same period.
Performance Past Does Not Indicate Future [Text] rr_PerformancePastDoesNotIndicateFuture The Portfolio’s past performance is no guarantee of future results.
Bar Chart Table: rr_BarChartTableAbstract  
Bar Chart [Heading] rr_BarChartHeading
Calendar Year Total Returns
(as of December 31 of each year)
Bar Chart Closing [Text Block] rr_BarChartClosingTextBlock Best quarter: 3rd, 2009, 17.82% and Worst quarter: 4th, 2008, (23.35)%
Average Annual Return: rr_AverageAnnualReturnAbstract  
Performance Table Heading rr_PerformanceTableHeading
Average Annual Total Returns%
(for the periods ended December 31, 2011)
Index No Deduction for Fees, Expenses, Taxes [Text] rr_IndexNoDeductionForFeesExpensesTaxes The index returns do not reflect deductions for fees, expenses, or taxes.
Class I Shares | ING MidCap Opportunities Portfolio | Class I
  
Operating Expenses: rr_OperatingExpensesAbstract  
Management Fee rr_ManagementFeesOverAssets 0.70%
Distribution and/or Shareholder Services (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Administrative Services Fee rr_Component1OtherExpensesOverAssets 0.10%
Other Expenses rr_OtherExpensesOverAssets 0.04%
Total Annual Portfolio Operating Expenses rr_ExpensesOverAssets 0.84%
Waivers and Reimbursements rr_FeeWaiverOrReimbursementOverAssets none [10]
Total Annual Portfolio Operating Expenses After Waivers and Reimbursements rr_NetExpensesOverAssets 0.84%
Expense Example: rr_ExpenseExampleAbstract  
1 Yr rr_ExpenseExampleYear01 86
3 Yrs rr_ExpenseExampleYear03 268
5 Yrs rr_ExpenseExampleYear05 466
10 Yrs rr_ExpenseExampleYear10 1,037
Bar Chart Table: rr_BarChartTableAbstract  
2002 rr_AnnualReturn2002 (25.86%)
2003 rr_AnnualReturn2003 36.67%
2004 rr_AnnualReturn2004 11.54%
2005 rr_AnnualReturn2005 10.35%
2006 rr_AnnualReturn2006 7.79%
2007 rr_AnnualReturn2007 25.74%
2008 rr_AnnualReturn2008 (37.62%)
2009 rr_AnnualReturn2009 41.44%
2010 rr_AnnualReturn2010 30.36%
2011 rr_AnnualReturn2011 (0.51%)
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel Best quarter:
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Sep. 30, 2009
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 17.82%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel Worst quarter:
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Dec. 31, 2008
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (23.35%)
Average Annual Return: rr_AverageAnnualReturnAbstract  
1 Yr rr_AverageAnnualReturnYear01 (0.51%)
5 Yrs rr_AverageAnnualReturnYear05 7.54%
10 Yrs rr_AverageAnnualReturnYear10 6.81%
Inception Date rr_AverageAnnualReturnInceptionDate May 05, 2000
Class I Shares | ING MidCap Opportunities Portfolio | Russell Midcap Growth Index
  
Average Annual Return: rr_AverageAnnualReturnAbstract  
1 Yr rr_AverageAnnualReturnYear01 (1.65%) [6]
5 Yrs rr_AverageAnnualReturnYear05 2.44% [6]
10 Yrs rr_AverageAnnualReturnYear10 5.29% [6]
Class I Shares | ING MidCap Opportunities Portfolio | Russell Midcap Index
  
Average Annual Return: rr_AverageAnnualReturnAbstract  
1 Yr rr_AverageAnnualReturnYear01 (1.55%) [6]
5 Yrs rr_AverageAnnualReturnYear05 1.41% [6]
10 Yrs rr_AverageAnnualReturnYear10 6.99% [6]
Class I Shares | ING SmallCap Opportunities Portfolio
  
Risk/Return: rr_RiskReturnAbstract  
Risk/Return [Heading] rr_RiskReturnHeading

ING SmallCap Opportunities Portfolio
Objective [Heading] rr_ObjectiveHeading

INVESTMENT OBJECTIVE
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock The Portfolio seeks long-term capital appreciation.
Expense [Heading] rr_ExpenseHeading

FEES AND EXPENSES OF THE PORTFOLIO
Expense Narrative [Text Block] rr_ExpenseNarrativeTextBlock The table describes the fees and expenses that you may pay if you buy and hold shares of the Portfolio. The table does not reflect fees or expenses that are, or may be, imposed under your variable annuity contracts or variable life insurance policies (“Variable Contract”) or a qualified pension or retirement plan (“Qualified Plan”). For more information on these charges, please refer to the documents governing your Variable Contract or consult your plan administrator.
Operating Expenses: rr_OperatingExpensesAbstract  
Operating Expenses Caption [Text] rr_OperatingExpensesCaption
Annual Portfolio Operating Expenses
Expenses you pay each year as a % of the value of your investment
Fee Waiver or Reimbursement over Assets, Date of Termination rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination May 1, 2013
Portfolio Turnover [Heading] rr_PortfolioTurnoverHeading
Portfolio Turnover % of average value of portfolio
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 transactions costs. These costs, which are not reflected in Annual Portfolio Operating Expenses or in the Expense Example, affect the Portfolio’s performance.

During the most recent fiscal year, the Portfolio’s portfolio turnover rate was 72% of the average value of its portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 72.00%
Expenses Not Correlated to Ratio Due to Acquired Fund Fees [Text] rr_ExpensesNotCorrelatedToRatioDueToAcquiredFundFees Total Annual Portfolio Operating Expenses may be higher than the Portfolio’s ratio of expenses to average net assets shown in the Portfolio’s Financial Highlights, which reflects the operating expenses of the Portfolio and does not include Acquired Fund Fees and Expenses.
Expense Example: rr_ExpenseExampleAbstract  
Expense Example [Heading] rr_ExpenseExampleHeading
Expense Example $
Expense Example Narrative [Text Block] rr_ExpenseExampleNarrativeTextBlock The Example is intended to help you compare the cost of investing in shares of the Portfolio with the costs of investing in other mutual funds. The Example does not reflect expenses and charges which are, or may be, imposed under your Variable Contract or Qualified Plan. The Example assumes that you invest $10,000 in the Portfolio for the time periods indicated. The Example also assumes that your investment had a 5% return each year and that the Portfolio’s operating expenses remain the same. Although your actual costs may be higher or lower, based on these assumptions your costs would be:
Expense Example Closing [Text Block] rr_ExpenseExampleClosingTextBlock The Example reflects applicable expense limitation agreements and/or waivers in effect, if any, for the one-year period and the first year of the three-, five-, and ten-year periods.
Strategy [Heading] rr_StrategyHeading

PRINCIPAL INVESTMENT STRATEGIES
Strategy Narrative [Text Block] rr_StrategyNarrativeTextBlock

Under normal market conditions, the Portfolio invests at least 80% of its net assets (plus borrowings for investment purposes) in common stock of smaller, lesser-known U.S. companies. The Portfolio will provide shareholders with at least 60 days’ prior notice of any change in this investment policy.

The Portfolio normally invests in companies that the sub-adviser (“Sub-Adviser”) believes have above average prospects for growth. For this Portfolio, smaller companies are those with market capitalizations that fall within the range of companies in the Russell 2000® Growth Index at the time of purchase. The Russell 2000® Growth Index is an index that measures the performance of small growth companies. Capitalization of companies in the Russell 2000® Growth Index will change with market conditions. The market capitalization of companies in the Russell 2000® Growth Index as of December 31, 2011, ranged from $23.4 million to $3.7 billion.

The Portfolio may invest in other investment companies, including exchange-traded funds, to the extent permitted under the Investment Company Act of 1940, as amended, and the rules, regulations, and exemptive orders thereunder (“1940 Act”).

The Sub-Adviser uses a disciplined combination of quantitative screens and bottom-up fundamental security analysis to build a broadly diversified portfolio of companies that the Sub-Adviser believes will have improving bottom lines, with reasonable valuation, and whose stocks demonstrate relative strength. The focus of company analysis is upon the prospects for continuing bottom-line growth, balance sheet strength, and cash flow characteristics. A proprietary measure is used to determine relative stock price strength. A determination of reasonable valuation for individual securities is based on the judgment of the Sub-Adviser.

The Sub-Adviser may sell securities for a variety of reasons, such as to secure gains, limit losses, or redeploy assets into opportunities believed to be more promising, among others.

The Portfolio may lend portfolio securities on a short-term or long-term basis, up to 33% of its total assets.
Risk [Heading] rr_RiskHeading

PRINCIPAL RISKS
Risk Narrative [Text Block] rr_RiskNarrativeTextBlock

You could lose money on an investment in the Portfolio. Any of the following risks, among others, could affect Portfolio performance or cause the Portfolio to lose money or to underperform market averages of other funds.

Company The price of a given company’s stock could decline or underperform for many reasons including, among others, poor management, financial problems, or business challenges. If a company declares bankruptcy or becomes insolvent, its stock could become worthless.

Investment Model The manager’s proprietary model may not adequately allow for existing or unforeseen market factors or the interplay between such factors.

Liquidity If a security is illiquid, the Portfolio might be unable to sell the security at a time when the Portfolio’s manager might wish to sell, and the security could have the effect of decreasing the overall level of the Portfolio’s liquidity. Further, the lack of an established secondary market may make it more difficult to value illiquid securities, which could vary from the amount the Portfolio could realize upon disposition. The Portfolio may make investments that become less liquid in response to market developments or adverse investor perception. The Portfolio could lose money if it cannot sell a security at the time and price that would be most beneficial to the Portfolio.

Market Stock prices may be volatile and are affected by the real or perceived impacts of such factors as economic conditions and political events. The stock market tends to be cyclical, with periods when stock prices generally rise and periods when stock prices generally decline. Any given stock market segment may remain out of favor with investors for a short or long period of time, and stocks as an asset class may underperform bonds or other asset classes during some periods. From time to time, the stock market may not favor the growth-oriented securities in which the Portfolio invests. Rather, the market could favor value-oriented securities or may not favor equities at all.

Other Investment Companies The main risk of investing in other investment companies, including exchange-traded funds, is the risk that the value of the securities underlying an investment company might decrease. Because the Portfolio may invest in other investment companies, you will pay a proportionate share of the expenses of that other investment company (including management fees, administration fees, and custodial fees) in addition to the expenses of the Portfolio.

Securities Lending Securities lending involves two primary risks: “investment risk” and “borrower default risk.” Investment risk is the risk that the Portfolio will lose money from the investment of the cash collateral received from the borrower. Borrower default risk is the risk that the Portfolio will lose money due to the failure of a borrower to return a borrowed security in a timely manner.

Small-Capitalization Company Investments in small-capitalization companies may involve greater risk than is customarily associated with larger, more established companies due to the greater business risks of small size, limited markets and financial resources, narrow product lines and the frequent lack of depth of management. The securities of smaller companies are often traded over-the-counter and may not be traded in volume typical on a national securities exchange.

An investment in the Portfolio is not a bank deposit and is not insured or guaranteed by the Federal Deposit Insurance Corporation, the Federal Reserve Board or any other government agency.
Risk Lose Money [Text] rr_RiskLoseMoney You could lose money on an investment in the Portfolio.
Risk Not Insured Depository Institution [Text] rr_RiskNotInsuredDepositoryInstitution An investment in the Portfolio is not a bank deposit and is not insured or guaranteed by the Federal Deposit Insurance Corporation, the Federal Reserve Board or any other government agency.
Bar Chart and Performance Table [Heading] rr_BarChartAndPerformanceTableHeading

PERFORMANCE INFORMATION
Performance Narrative [Text Block] rr_PerformanceNarrativeTextBlock The following information is intended to help you understand the risks of investing in the Portfolio. The following bar chart shows the changes in the Portfolio’s Class I shares’ performance from year to year, and the table compares the Portfolio’s Class I shares’ performance to the performance of a broad-based securities market index/indices for the same period. The Portfolio’s performance information reflects applicable fee waivers and/or expense limitations in effect during the period presented. Absent such fee waivers/expense limitations, if any, performance would have been lower. Performance in the Average Annual Total Returns table does not include insurance-related charges imposed under a Variable Contract or expenses related to a Qualified Plan. If these charges or expenses were included, performance would be lower. Thus, you should not compare the Portfolio’s performance directly with the performance information of other investment products without taking into account all insurance-related charges and expenses payable under your Variable Contract or Qualified Plan. The Portfolio’s past performance is no guarantee of future results.
Performance Information Illustrates Variability of Returns [Text] rr_PerformanceInformationIllustratesVariabilityOfReturns The following bar chart shows the changes in the Portfolio’s Class I shares’ performance from year to year, and the table compares the Portfolio’s Class I shares’ performance to the performance of a broad-based securities market index/indices for the same period.
Performance Past Does Not Indicate Future [Text] rr_PerformancePastDoesNotIndicateFuture The Portfolio’s past performance is no guarantee of future results.
Bar Chart Table: rr_BarChartTableAbstract  
Bar Chart [Heading] rr_BarChartHeading
Calendar Year Total Returns
(as of December 31 of each year)
Bar Chart Closing [Text Block] rr_BarChartClosingTextBlock Best quarter: 2nd, 2009, 22.83% and Worst quarter: 4th, 2008, (25.27)%
Average Annual Return: rr_AverageAnnualReturnAbstract  
Performance Table Heading rr_PerformanceTableHeading
Average Annual Total Returns%
(for the periods ended December 31, 2011)
Index No Deduction for Fees, Expenses, Taxes [Text] rr_IndexNoDeductionForFeesExpensesTaxes The index returns do not reflect deductions for fees, expenses, or taxes.
Class I Shares | ING SmallCap Opportunities Portfolio | Class I
  
Operating Expenses: rr_OperatingExpensesAbstract  
Management Fee rr_ManagementFeesOverAssets 0.75%
Distribution and/or Shareholder Services (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Administrative Services Fee rr_Component1OtherExpensesOverAssets 0.10%
Other Expenses rr_OtherExpensesOverAssets 0.05%
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.01%
Total Annual Portfolio Operating Expenses rr_ExpensesOverAssets 0.91% [7]
Waivers and Reimbursements rr_FeeWaiverOrReimbursementOverAssets none [11]
Total Annual Portfolio Operating Expenses After Waivers and Reimbursements rr_NetExpensesOverAssets 0.91%
Expense Example: rr_ExpenseExampleAbstract  
1 Yr rr_ExpenseExampleYear01 93
3 Yrs rr_ExpenseExampleYear03 290
5 Yrs rr_ExpenseExampleYear05 504
10 Yrs rr_ExpenseExampleYear10 1,120
Bar Chart Table: rr_BarChartTableAbstract  
2002 rr_AnnualReturn2002 (43.64%)
2003 rr_AnnualReturn2003 38.72%
2004 rr_AnnualReturn2004 10.16%
2005 rr_AnnualReturn2005 9.10%
2006 rr_AnnualReturn2006 12.57%
2007 rr_AnnualReturn2007 10.07%
2008 rr_AnnualReturn2008 (34.48%)
2009 rr_AnnualReturn2009 31.05%
2010 rr_AnnualReturn2010 32.34%
2011 rr_AnnualReturn2011 0.85%
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel Best quarter:
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Jun. 30, 2009
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 22.83%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel Worst quarter:
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Dec. 31, 2008
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (25.27%)
Average Annual Return: rr_AverageAnnualReturnAbstract  
1 Yr rr_AverageAnnualReturnYear01 0.85%
5 Yrs rr_AverageAnnualReturnYear05 4.75%
10 Yrs rr_AverageAnnualReturnYear10 2.92%
Inception Date rr_AverageAnnualReturnInceptionDate May 06, 1994
Class I Shares | ING SmallCap Opportunities Portfolio | Russell 2000 Growth Index
  
Average Annual Return: rr_AverageAnnualReturnAbstract  
1 Yr rr_AverageAnnualReturnYear01 (2.91%) [6]
5 Yrs rr_AverageAnnualReturnYear05 2.09% [6]
10 Yrs rr_AverageAnnualReturnYear10 4.48% [6]
Class I Shares | ING SmallCap Opportunities Portfolio | Russell 2000 Index
  
Average Annual Return: rr_AverageAnnualReturnAbstract  
1 Yr rr_AverageAnnualReturnYear01 (4.18%) [6]
5 Yrs rr_AverageAnnualReturnYear05 0.15% [6]
10 Yrs rr_AverageAnnualReturnYear10 5.62% [6]
Class S Shares | ING International Value Portfolio
  
Risk/Return: rr_RiskReturnAbstract  
Risk/Return [Heading] rr_RiskReturnHeading

ING International Value Portfolio
Objective [Heading] rr_ObjectiveHeading

INVESTMENT OBJECTIVE
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock The Portfolio seeks long-term capital appreciation.
Expense [Heading] rr_ExpenseHeading

FEES AND EXPENSES OF THE PORTFOLIO
Expense Narrative [Text Block] rr_ExpenseNarrativeTextBlock The table describes the fees and expenses that you may pay if you buy and hold shares of the Portfolio. The table does not reflect fees or expenses that are, or may be, imposed under your variable annuity contracts or variable life insurance policies (“Variable Contract”) or a qualified pension or retirement plan (“Qualified Plan”). For more information on these charges, please refer to the documents governing your Variable Contract or consult your plan administrator.
Operating Expenses: rr_OperatingExpensesAbstract  
Operating Expenses Caption [Text] rr_OperatingExpensesCaption
Annual Portfolio Operating Expenses
Expenses you pay each year as a % of the value of your investment
Fee Waiver or Reimbursement over Assets, Date of Termination rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination May 1, 2013
Portfolio Turnover [Heading] rr_PortfolioTurnoverHeading
Portfolio Turnover % of average value of portfolio
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 transactions costs. These costs, which are not reflected in Annual Portfolio Operating Expenses or in the Expense Example, affect the Portfolio’s performance.

During the most recent fiscal year, the Portfolio’s portfolio turnover rate was 69% of the average value of its portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 69.00%
Expense Example: rr_ExpenseExampleAbstract  
Expense Example [Heading] rr_ExpenseExampleHeading
Expense Example $
Expense Example Narrative [Text Block] rr_ExpenseExampleNarrativeTextBlock The Example is intended to help you compare the cost of investing in shares of the Portfolio with the costs of investing in other mutual funds. The Example does not reflect expenses and charges which are, or may be, imposed under your Variable Contract or Qualified Plan. The Example assumes that you invest $10,000 in the Portfolio for the time periods indicated. The Example also assumes that your investment had a 5% return each year and that the Portfolio’s operating expenses remain the same. Although your actual costs may be higher or lower, based on these assumptions your costs would be:
Expense Example Closing [Text Block] rr_ExpenseExampleClosingTextBlock The Example reflects applicable expense limitation agreements and/or waivers in effect, if any, for the one-year period and the first year of the three-, five-, and ten-year periods.
Strategy [Heading] rr_StrategyHeading

PRINCIPAL INVESTMENT STRATEGIES
Strategy Narrative [Text Block] rr_StrategyNarrativeTextBlock

Under normal market conditions, the Portfolio invests at least 65% of its net assets in equity securities of companies located in a number of different countries outside of the United States. The Portfolio invests primarily in companies with a large market capitalization, but may also invest in small- and mid-sized companies. The Portfolio generally invests in common and preferred stocks, warrants, and convertible securities. The Portfolio may invest in companies located in countries with emerging securities markets when the sub-adviser (“Sub-Adviser”) believes they present attractive investment opportunities. The Portfolio may invest in government debt securities of developed foreign countries. The Portfolio may also invest up to 35% of its assets in securities of U.S. issuers, including investment-grade government and corporate debt securities.

The Portfolio may invest in derivative instruments including futures, options, and swaps. The Portfolio typically uses derivatives to hedge against currency risk and for purposes of maintaining equity market exposure on its cash balance.

The Portfolio may invest in other investment companies, including exchange-traded funds, to the extent permitted under the Investment Company Act of 1940, as amended, and the rules, regulations, and exemptive orders thereunder (“1940 Act”).

The Sub-Adviser primarily uses a bottom-up fundamental analysis to identify stocks which it believes offer good value relative to their peers in the same industry, sector, or region. It also uses a top-down analysis to identify important themes or issues which may affect the investment environment in certain regions or sectors and to estimate regional market risks. In conducting its fundamental analysis, the Sub-Adviser focuses on various factors including valuation of the companies, catalysts to stock price appreciation, quality of management, and financial measures, especially cash flow and cash flow return on capital.

The Sub-Adviser may sell securities for a variety of reasons, such as to secure gains, limit losses, or redeploy assets into opportunities believed to be more promising, among others.

The Portfolio may lend portfolio securities on a short-term or long-term basis, up to 331/3 % of its total assets.
Risk [Heading] rr_RiskHeading

PRINCIPAL RISKS
Risk Narrative [Text Block] rr_RiskNarrativeTextBlock

You could lose money on an investment in the Portfolio. Any of the following risks, among others, could affect Portfolio performance or cause the Portfolio to lose money or to underperform market averages of other funds.

Company The price of a given company’s stock could decline or underperform for many reasons including, among others, poor management, financial problems, or business challenges. If a company declares bankruptcy or becomes insolvent, its stock could become worthless.

Convertible Securities Convertible securities are securities that are convertible into or exercisable for common stocks at a stated price or rate. Convertible securities are subject to the usual risks associated with debt securities, such as interest rate and credit risk. In addition, because convertible securities react to changes in the value of the stocks into which they convert, they are subject to market risk.

Credit Prices of bonds and other debt securities can fall if the issuer’s actual or perceived financial health deteriorates, whether because of broad economic or issuer-specific reasons. In certain cases, the issuer could be late in paying interest or principal, or could fail to pay altogether.

Currency To the extent that the Portfolio invests directly in foreign currencies or in securities denominated in, or that trade in, foreign (non-U.S.) currencies, it is subject to the risk that those currencies will decline in value relative to the U.S. dollar or, in the case of hedging positions, that the U.S. dollar will decline in value relative to the currency being hedged.

Derivative Instruments Derivative instruments are subject to a number of risks, including the risk of changes in the market price of the underlying securities, credit risk with respect to the counterparty, risk of loss due to changes in interest rates and liquidity risk. The use of certain derivatives may also have a leveraging effect which may increase the volatility of the Portfolio and reduce its returns.

Foreign Investments/Developing and Emerging Markets Investing in foreign (non-U.S.) securities may result in the Portfolio experiencing more rapid and extreme changes in value than a fund that invests exclusively in securities of U.S. companies, due to smaller markets, differing reporting, accounting and auditing standards, and nationalization, expropriation or confiscatory taxation, foreign currency fluctuations, currency blockage, or replacement, potential for default on sovereign debt, or political changes or diplomatic developments. Foreign investment risks may be greater in developing and emerging markets than in developed markets.

Interest Rate With bonds and other fixed rate debt securities, a rise in interest rates generally causes values to fall; conversely, values generally rise as interest rates fall. The higher the credit quality of the security, and the longer its maturity or duration, the more sensitive it is likely to be to interest rate risk.

Liquidity If a security is illiquid, the Portfolio might be unable to sell the security at a time when the Portfolio’s manager might wish to sell, and the security could have the effect of decreasing the overall level of the Portfolio’s liquidity. Further, the lack of an established secondary market may make it more difficult to value illiquid securities, which could vary from the amount the Portfolio could realize upon disposition. The Portfolio may make investments that become less liquid in response to market developments or adverse investor perception. The Portfolio could lose money if it cannot sell a security at the time and price that would be most beneficial to the Portfolio.

Market Stock prices may be volatile and are affected by the real or perceived impacts of such factors as economic conditions and political events. The stock market tends to be cyclical, with periods when stock prices generally rise and periods when stock prices generally decline. Any given stock market segment may remain out of favor with investors for a short or long period of time, and stocks as an asset class may underperform bonds or other asset classes during some periods. From time to time, the stock market may not favor the value-oriented securities in which the Portfolio invests. Rather, the market could favor growth-oriented securities or may not favor equities at all.

Market Capitalization Stocks fall into three broad market capitalization categories - large, mid, and small. Investing primarily in one category carries the risk that, due to current market conditions, that category may be out of favor with investors. If valuations of large-capitalization companies appear to be greatly out of proportion to the valuations of mid- or small-capitalization companies, investors may migrate to the stocks of mid- and small-sized companies causing the Portfolio that invests in these companies to increase in value more rapidly than a fund that invests in larger, fully-valued companies. Investing in mid- and small-capitalization companies may be subject to special risks associated with narrower product lines, more limited financial resources, smaller management groups, and a more limited trading market for their stocks as compared with larger companies. As a result, stocks of mid- and small-capitalization companies may decline significantly in market downturns.

Other Investment Companies The main risk of investing in other investment companies, including exchange-traded funds, is the risk that the value of the securities underlying an investment company might decrease. Because the Portfolio may invest in other investment companies, you will pay a proportionate share of the expenses of that other investment company (including management fees, administration fees, and custodial fees) in addition to the expenses of the Portfolio.

Securities Lending Securities lending involves two primary risks: “investment risk” and “borrower default risk.” Investment risk is the risk that the Portfolio will lose money from the investment of the cash collateral received from the borrower. Borrower default risk is the risk that the Portfolio will lose money due to the failure of a borrower to return a borrowed security in a timely manner.

Sovereign Debt These securities are issued or guaranteed by foreign government entities. Investments in sovereign debt are subject to the risk that a government entity may delay payment, restructure its debt, or refuse to pay interest or repay principal on its sovereign debt. Some of these reasons may include cash flow problems, insufficient foreign currency reserves, political considerations, the relative size of its debt position to its economy or its failure to put in place economic reforms required by the International Monetary Fund or other multilateral agencies. If a government entity defaults, it may ask for more time in which to pay or for further loans. There is no legal process for collecting sovereign debts that a government does not pay or bankruptcy proceeding by which all or part of sovereign debt that a government entity has not repaid may be collected.

U.S. Government Securities and Obligations U.S. government securities are obligations of, or guaranteed by, the U.S. government, its agencies or government-sponsored enterprises. U.S. government securities are subject to market and interest rate risk, and may be subject to varying degrees of credit risk.

Value Investing Securities that appear to be undervalued may never appreciate to the extent expected. Further, because the prices of value-oriented securities tend to correlate more closely with economic cycles than growth-oriented securities, they generally are more sensitive to changing economic conditions, such as changes in interest rates, corporate earnings and industrial production.

An investment in the Portfolio is not a bank deposit and is not insured or guaranteed by the Federal Deposit Insurance Corporation, the Federal Reserve Board or any other government agency.
Risk Lose Money [Text] rr_RiskLoseMoney You could lose money on an investment in the Portfolio.
Risk Not Insured Depository Institution [Text] rr_RiskNotInsuredDepositoryInstitution An investment in the Portfolio is not a bank deposit and is not insured or guaranteed by the Federal Deposit Insurance Corporation, the Federal Reserve Board or any other government agency.
Bar Chart and Performance Table [Heading] rr_BarChartAndPerformanceTableHeading

PERFORMANCE INFORMATION
Performance Narrative [Text Block] rr_PerformanceNarrativeTextBlock The following information is intended to help you understand the risks of investing in the Portfolio. The following bar chart shows the changes in the Portfolio’s Class S shares’ and Class I shares’ performance from year to year, and the table compares the Portfolio’s Class S shares’ and Class I shares’ performance to the performance of a broad-based securities market index/indices for the same period. Class I shares’ performance has been adjusted to reflect the higher expenses of Class S shares. The Class S shares and Class I shares of the Portfolio would have substantially similar performance because they invest in the same portfolio of securities. However, Class I shares’ performance would be higher than Class S shares’ performance because of the higher expenses paid by Class S shares. The Portfolio’s performance information reflects applicable fee waivers and/or expense limitations in effect during the period presented. Absent such fee waivers/expense limitations, if any, performance would have been lower. Performance in the Average Annual Total Returns table does not include insurance-related charges imposed under a Variable Contract or expenses related to a Qualified Plan. If these charges or expenses were included, performance would be lower. Thus, you should not compare the Portfolio’s performance directly with the performance information of other investment products without taking into account all insurance-related charges and expenses payable under your Variable Contract or Qualified Plan. The Portfolio’s past performance is no guarantee of future results.
Performance Information Illustrates Variability of Returns [Text] rr_PerformanceInformationIllustratesVariabilityOfReturns The following bar chart shows the changes in the Portfolio’s Class S shares’ and Class I shares’ performance from year to year, and the table compares the Portfolio’s Class S shares’ and Class I shares’ performance to the performance of a broad-based securities market index/indices for the same period.
Performance Past Does Not Indicate Future [Text] rr_PerformancePastDoesNotIndicateFuture The Portfolio’s past performance is no guarantee of future results.
Bar Chart Table: rr_BarChartTableAbstract  
Bar Chart [Heading] rr_BarChartHeading
Calendar Year Total Returns
(as of December 31 of each year)
Bar Chart Narrative [Text Block] rr_BarChartNarrativeTextBlock The bar chart below shows the Portfolio’s adjusted Class I shares’ performance (2002) and Class S shares’ performance (2003-2011).
Bar Chart Closing [Text Block] rr_BarChartClosingTextBlock Best quarter: 2nd, 2009, 26.29% and Worst quarter: 3rd, 2011, (22.46)%
Average Annual Return: rr_AverageAnnualReturnAbstract  
Performance Table Heading rr_PerformanceTableHeading
Average Annual Total Returns%
(for the periods ended December 31, 2011)
Index No Deduction for Fees, Expenses, Taxes [Text] rr_IndexNoDeductionForFeesExpensesTaxes The index returns include the reinvestment of dividends and distributions net of withholding taxes, but do not reflect fees, brokerage commissions, or other expenses.
Class S Shares | ING International Value Portfolio | Class S
  
Operating Expenses: rr_OperatingExpensesAbstract  
Management Fee rr_ManagementFeesOverAssets 0.80%
Distribution and/or Shareholder Services (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.25%
Administrative Services Fee rr_Component1OtherExpensesOverAssets 0.10%
Other Expenses rr_OtherExpensesOverAssets 0.16%
Total Annual Portfolio Operating Expenses rr_ExpensesOverAssets 1.31%
Waivers and Reimbursements rr_FeeWaiverOrReimbursementOverAssets (0.10%) [12]
Total Annual Portfolio Operating Expenses After Waivers and Reimbursements rr_NetExpensesOverAssets 1.21%
Expense Example: rr_ExpenseExampleAbstract  
1 Yr rr_ExpenseExampleYear01 123
3 Yrs rr_ExpenseExampleYear03 405
5 Yrs rr_ExpenseExampleYear05 709
10 Yrs rr_ExpenseExampleYear10 1,570
Bar Chart Table: rr_BarChartTableAbstract  
2003 rr_AnnualReturn2003 29.79%
2004 rr_AnnualReturn2004 17.03%
2005 rr_AnnualReturn2005 9.04%
2006 rr_AnnualReturn2006 28.81%
2007 rr_AnnualReturn2007 13.06%
2008 rr_AnnualReturn2008 (42.31%)
2009 rr_AnnualReturn2009 26.13%
2010 rr_AnnualReturn2010 2.36%
2011 rr_AnnualReturn2011 (14.99%)
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel Best quarter:
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Jun. 30, 2009
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 26.29%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel Worst quarter:
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Sep. 30, 2011
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (22.46%)
Average Annual Return: rr_AverageAnnualReturnAbstract  
1 Yr rr_AverageAnnualReturnYear01 (14.99%)
5 Yrs rr_AverageAnnualReturnYear05 (6.46%)
10 Yrs rr_AverageAnnualReturnYear10   
Since Inception rr_AverageAnnualReturnSinceInception 2.20%
Inception Date rr_AverageAnnualReturnInceptionDate Mar. 19, 2002
Class S Shares | ING International Value Portfolio | Class I
  
Bar Chart Table: rr_BarChartTableAbstract  
2002 rr_AnnualReturn2002 (15.62%)
Average Annual Return: rr_AverageAnnualReturnAbstract  
1 Yr rr_AverageAnnualReturnYear01 (15.13%) [2]
5 Yrs rr_AverageAnnualReturnYear05 (6.55%) [2]
10 Yrs rr_AverageAnnualReturnYear10 2.57% [2]
Inception Date rr_AverageAnnualReturnInceptionDate Aug. 08, 1997 [2]
Class S Shares | ING International Value Portfolio | MSCI EAFE Index | Class S
  
Average Annual Return: rr_AverageAnnualReturnAbstract  
1 Yr rr_AverageAnnualReturnYear01 (12.14%) [3]
5 Yrs rr_AverageAnnualReturnYear05 (4.72%) [3]
10 Yrs rr_AverageAnnualReturnYear10    [3]
Since Inception rr_AverageAnnualReturnSinceInception 4.73% [3],[4]
Class S Shares | ING International Value Portfolio | MSCI EAFE Index | Class I
  
Average Annual Return: rr_AverageAnnualReturnAbstract  
1 Yr rr_AverageAnnualReturnYear01 (12.14%) [3]
5 Yrs rr_AverageAnnualReturnYear05 (4.72%) [3]
10 Yrs rr_AverageAnnualReturnYear10 4.67% [3]
Class S Shares | ING MidCap Opportunities Portfolio
  
Risk/Return: rr_RiskReturnAbstract  
Risk/Return [Heading] rr_RiskReturnHeading

ING MidCap Opportunities Portfolio
Objective [Heading] rr_ObjectiveHeading

INVESTMENT OBJECTIVE
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock The Portfolio seeks long-term capital appreciation.
Expense [Heading] rr_ExpenseHeading

FEES AND EXPENSES OF THE PORTFOLIO
Expense Narrative [Text Block] rr_ExpenseNarrativeTextBlock The table describes the fees and expenses that you may pay if you buy and hold shares of the Portfolio. The table does not reflect fees or expenses that are, or may be, imposed under your variable annuity contracts or variable life insurance policies (“Variable Contract”) or a qualified pension or retirement plan (“Qualified Plan”). For more information on these charges, please refer to the documents governing your Variable Contract or consult your plan administrator.
Operating Expenses: rr_OperatingExpensesAbstract  
Operating Expenses Caption [Text] rr_OperatingExpensesCaption
Annual Portfolio Operating Expenses
Expenses you pay each year as a % of the value of your investment
Fee Waiver or Reimbursement over Assets, Date of Termination rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination May 2, 2013
Portfolio Turnover [Heading] rr_PortfolioTurnoverHeading
Portfolio Turnover % of average value of portfolio
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 transactions costs. These costs, which are not reflected in Annual Portfolio Operating Expenses or in the Expense Example, affect the Portfolio’s performance.

During the most recent fiscal year, the Portfolio’s portfolio turnover rate was 90% of the average value of its portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 90.00%
Expense Example: rr_ExpenseExampleAbstract  
Expense Example [Heading] rr_ExpenseExampleHeading
Expense Example $
Expense Example Narrative [Text Block] rr_ExpenseExampleNarrativeTextBlock The Example is intended to help you compare the cost of investing in shares of the Portfolio with the costs of investing in other mutual funds. The Example does not reflect expenses and charges which are, or may be, imposed under your Variable Contract or Qualified Plan. The Example assumes that you invest $10,000 in the Portfolio for the time periods indicated. The Example also assumes that your investment had a 5% return each year and that the Portfolio’s operating expenses remain the same. Although your actual costs may be higher or lower, based on these assumptions your costs would be:
Expense Example Closing [Text Block] rr_ExpenseExampleClosingTextBlock The Example reflects applicable expense limitation agreements and/or waivers in effect, if any, for the one-year period and the first year of the three-, five-, and ten-year periods.
Strategy [Heading] rr_StrategyHeading

PRINCIPAL INVESTMENT STRATEGIES
Strategy Narrative [Text Block] rr_StrategyNarrativeTextBlock

Under normal market conditions, the Portfolio invests at least 80% of its net assets (plus borrowings for investment purposes) in common stock of mid-sized U.S. companies. The Portfolio will provide shareholders with at least 60 days’ prior notice of any change in this investment policy.

The Portfolio normally invests in companies that the sub-adviser (“Sub-Adviser”) believes have above average prospects for growth. For this Portfolio, mid-sized companies are those companies with market capitalizations that fall within the range of companies in the Russell Midcap® Growth Index at the time of purchase. Capitalization of companies in the Russell Midcap® Growth Index will change with market conditions. The market capitalization of companies in the Russell Midcap® Growth Index as of December 31, 2011, ranged from $117.3 million to $20.5 billion.

The Portfolio may also invest in derivative instruments including futures or index futures that have a similar profile to the benchmark of the Portfolio. The Portfolio typically uses derivatives for the purpose of maintaining equity market exposure on its cash balance. The Portfolio may also invest in foreign securities.

The Portfolio may invest in other investment companies, including exchange-traded funds, to the extent permitted under the Investment Company Act of 1940, as amended, and the rules, regulations, and exemptive orders thereunder (“1940 Act”).

The Sub-Adviser uses a stock selection process that combines the discipline of quantitative screens with rigorous fundamental security analysis. The quantitative screens focus the fundamental analysis by seeking to identify the stocks of companies with strong business momentum that demonstrate relative price strength, and have a perceived value not reflected in the current price. The objective of the fundamental analysis is to confirm the persistence of the company’s revenue and earnings growth and validate the Sub-Adviser’s expectations for earnings estimate revisions, particularly relative to consensus. A determination of reasonable valuation for individual securities is based on the judgment of the Sub-Adviser.

The Sub-Adviser may sell securities for a variety of reasons, such as to secure gains, limit losses, or redeploy assets into opportunities believed to be more promising, among others.

The Portfolio may lend portfolio securities on a short-term or long-term basis, up to 33% of its total assets.
Risk [Heading] rr_RiskHeading

PRINCIPAL RISKS
Risk Narrative [Text Block] rr_RiskNarrativeTextBlock

You could lose money on an investment in the Portfolio. Any of the following risks, among others, could affect Portfolio performance or cause the Portfolio to lose money or to underperform market averages of other funds.

Company The price of a given company’s stock could decline or underperform for many reasons including, among others, poor management, financial problems, or business challenges. If a company declares bankruptcy or becomes insolvent, its stock could become worthless.

Currency To the extent that the Portfolio invests directly in foreign currencies or in securities denominated in, or that trade in, foreign (non-U.S.) currencies, it is subject to the risk that those currencies will decline in value relative to the U.S. dollar or, in the case of hedging positions, that the U.S. dollar will decline in value relative to the currency being hedged.

Derivative Instruments Derivative instruments are subject to a number of risks, including the risk of changes in the market price of the underlying securities, credit risk with respect to the counterparty, risk of loss due to changes in interest rates and liquidity risk. The use of certain derivatives may also have a leveraging effect which may increase the volatility of the Portfolio and reduce its returns.

Foreign Investments Investing in foreign (non-U.S.) securities may result in the Portfolio experiencing more rapid and extreme changes in value than a fund that invests exclusively in securities of U.S. companies due to smaller markets, differing reporting, accounting and auditing standards, and nationalization, expropriation or confiscatory taxation, foreign currency fluctuations, currency blockage or replacement, potential for default on sovereign debt, or political changes or diplomatic developments.

Investment Model The manager’s proprietary model may not adequately allow for existing or unforeseen market factors or the interplay between such factors.

Liquidity If a security is illiquid, the Portfolio might be unable to sell the security at a time when the Portfolio’s manager might wish to sell, and the security could have the effect of decreasing the overall level of the Portfolio’s liquidity. Further, the lack of an established secondary market may make it more difficult to value illiquid securities, which could vary from the amount the Portfolio could realize upon disposition. The Portfolio may make investments that become less liquid in response to market developments or adverse investor perception. The Portfolio could lose money if it cannot sell a security at the time and price that would be most beneficial to the Portfolio.

Market Stock prices may be volatile and are affected by the real or perceived impacts of such factors as economic conditions and political events. The stock market tends to be cyclical, with periods when stock prices generally rise and periods when stock prices generally decline. Any given stock market segment may remain out of favor with investors for a short or long period of time, and stocks as an asset class may underperform bonds or other asset classes during some periods. From time to time, the stock market may not favor the growth-oriented securities in which the Portfolio invests. Rather, the market could favor value-oriented securities or may not favor equities at all.

Mid-Capitalization Company Investments in mid-capitalization companies may involve greater risk than is customarily associated with larger, more established companies due to the greater business risks of smaller size, limited markets and financial resources, narrow product lines and the frequent lack of depth of management. Consequently, the securities of smaller companies may have limited market stability and may be subject to more abrupt or erratic market movements than securities of larger, more established growth companies or the market averages in general.

Other Investment Companies The main risk of investing in other investment companies, including exchange-traded funds, is the risk that the value of the securities underlying an investment company might decrease. Because the Portfolio may invest in other investment companies, you will pay a proportionate share of the expenses of that other investment company (including management fees, administration fees, and custodial fees) in addition to the expenses of the Portfolio.

Securities Lending Securities lending involves two primary risks: “investment risk” and “borrower default risk.” Investment risk is the risk that the Portfolio will lose money from the investment of the cash collateral received from the borrower. Borrower default risk is the risk that the Portfolio will lose money due to the failure of a borrower to return a borrowed security in a timely manner.

An investment in the Portfolio is not a bank deposit and is not insured or guaranteed by the Federal Deposit Insurance Corporation, the Federal Reserve Board or any other government agency.

Risk Lose Money [Text] rr_RiskLoseMoney You could lose money on an investment in the Portfolio.
Risk Not Insured Depository Institution [Text] rr_RiskNotInsuredDepositoryInstitution An investment in the Portfolio is not a bank deposit and is not insured or guaranteed by the Federal Deposit Insurance Corporation, the Federal Reserve Board or any other government agency.
Bar Chart and Performance Table [Heading] rr_BarChartAndPerformanceTableHeading

PERFORMANCE INFORMATION
Performance Narrative [Text Block] rr_PerformanceNarrativeTextBlock The following information is intended to help you understand the risks of investing in the Portfolio. The following bar chart shows the changes in the Portfolio’s Class S shares’ performance from year to year, and the table compares the Portfolio’s Class S shares’ performance to the performance of a broad-based securities market index/indices for the same period. The Portfolio’s performance information reflects applicable fee waivers and/or expense limitations in effect during the period presented. Absent such fee waivers/expense limitations, if any, performance would have been lower. Performance in the Average Annual Total Returns table does not include insurance-related charges imposed under a Variable Contract or expenses related to a Qualified Plan. If these charges or expenses were included, performance would be lower. Thus, you should not compare the Portfolio’s performance directly with the performance information of other investment products without taking into account all insurance-related charges and expenses payable under your Variable Contract or Qualified Plan. The Portfolio’s past performance is no guarantee of future results.
Performance Information Illustrates Variability of Returns [Text] rr_PerformanceInformationIllustratesVariabilityOfReturns The following bar chart shows the changes in the Portfolio’s Class S shares’ performance from year to year, and the table compares the Portfolio’s Class S shares’ performance to the performance of a broad-based securities market index/indices for the same period.
Performance Past Does Not Indicate Future [Text] rr_PerformancePastDoesNotIndicateFuture The Portfolio’s past performance is no guarantee of future results.
Bar Chart Table: rr_BarChartTableAbstract  
Bar Chart [Heading] rr_BarChartHeading
Calendar Year Total Returns
(as of December 31 of each year)
Bar Chart Closing [Text Block] rr_BarChartClosingTextBlock Best quarter: 3rd, 2009, 17.65% and Worst quarter: 4th, 2008, (23.39)%
Average Annual Return: rr_AverageAnnualReturnAbstract  
Performance Table Heading rr_PerformanceTableHeading
Average Annual Total Returns%
(for the periods ended December 31, 2011)
Index No Deduction for Fees, Expenses, Taxes [Text] rr_IndexNoDeductionForFeesExpensesTaxes The index returns do not reflect deductions for fees, expenses, or taxes.
Class S Shares | ING MidCap Opportunities Portfolio | Class S
  
Operating Expenses: rr_OperatingExpensesAbstract  
Management Fee rr_ManagementFeesOverAssets 0.70%
Distribution and/or Shareholder Services (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.25%
Administrative Services Fee rr_Component1OtherExpensesOverAssets 0.10%
Other Expenses rr_OtherExpensesOverAssets 0.04%
Total Annual Portfolio Operating Expenses rr_ExpensesOverAssets 1.09%
Waivers and Reimbursements rr_FeeWaiverOrReimbursementOverAssets none [13]
Total Annual Portfolio Operating Expenses After Waivers and Reimbursements rr_NetExpensesOverAssets 1.09%
Expense Example: rr_ExpenseExampleAbstract  
1 Yr rr_ExpenseExampleYear01 111
3 Yrs rr_ExpenseExampleYear03 347
5 Yrs rr_ExpenseExampleYear05 601
10 Yrs rr_ExpenseExampleYear10 1,329
Bar Chart Table: rr_BarChartTableAbstract  
2002 rr_AnnualReturn2002 (25.99%)
2003 rr_AnnualReturn2003 36.69%
2004 rr_AnnualReturn2004 11.13%
2005 rr_AnnualReturn2005 10.16%
2006 rr_AnnualReturn2006 7.62%
2007 rr_AnnualReturn2007 25.47%
2008 rr_AnnualReturn2008 (37.72%)
2009 rr_AnnualReturn2009 41.04%
2010 rr_AnnualReturn2010 29.96%
2011 rr_AnnualReturn2011 (0.79%)
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel Best quarter:
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Sep. 30, 2009
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 17.65%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel Worst quarter:
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Dec. 31, 2008
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (23.39%)
Average Annual Return: rr_AverageAnnualReturnAbstract  
1 Yr rr_AverageAnnualReturnYear01 (0.79%)
5 Yrs rr_AverageAnnualReturnYear05 7.28%
10 Yrs rr_AverageAnnualReturnYear10 6.59%
Inception Date rr_AverageAnnualReturnInceptionDate May 07, 2001
Class S Shares | ING MidCap Opportunities Portfolio | Russell Midcap Growth Index
  
Average Annual Return: rr_AverageAnnualReturnAbstract  
1 Yr rr_AverageAnnualReturnYear01 (1.65%) [6]
5 Yrs rr_AverageAnnualReturnYear05 2.44% [6]
10 Yrs rr_AverageAnnualReturnYear10 5.29% [6]
Class S Shares | ING MidCap Opportunities Portfolio | Russell Midcap Index
  
Average Annual Return: rr_AverageAnnualReturnAbstract  
1 Yr rr_AverageAnnualReturnYear01 (1.55%) [6]
5 Yrs rr_AverageAnnualReturnYear05 1.41% [6]
10 Yrs rr_AverageAnnualReturnYear10 6.99% [6]
Class S Shares | ING SmallCap Opportunities Portfolio
  
Risk/Return: rr_RiskReturnAbstract  
Risk/Return [Heading] rr_RiskReturnHeading

ING SmallCap Opportunities Portfolio
Objective [Heading] rr_ObjectiveHeading

INVESTMENT OBJECTIVE
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock The Portfolio seeks long-term capital appreciation.
Expense [Heading] rr_ExpenseHeading

FEES AND EXPENSES OF THE PORTFOLIO
Expense Narrative [Text Block] rr_ExpenseNarrativeTextBlock The table describes the fees and expenses that you may pay if you buy and hold shares of the Portfolio. The table does not reflect fees or expenses that are, or may be, imposed under your variable annuity contracts or variable life insurance policies (“Variable Contract”) or a qualified pension or retirement plan (“Qualified Plan”). For more information on these charges, please refer to the documents governing your Variable Contract or consult your plan administrator.
Operating Expenses: rr_OperatingExpensesAbstract  
Operating Expenses Caption [Text] rr_OperatingExpensesCaption
Annual Portfolio Operating Expenses
Expenses you pay each year as a % of the value of your investment
Fee Waiver or Reimbursement over Assets, Date of Termination rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination May 1, 2013
Portfolio Turnover [Heading] rr_PortfolioTurnoverHeading
Portfolio Turnover % of average value of portfolio
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 transactions costs. These costs, which are not reflected in Annual Portfolio Operating Expenses or in the Expense Example, affect the Portfolio’s performance.

During the most recent fiscal year, the Portfolio’s portfolio turnover rate was 72% of the average value of its portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 72.00%
Expenses Not Correlated to Ratio Due to Acquired Fund Fees [Text] rr_ExpensesNotCorrelatedToRatioDueToAcquiredFundFees Total Annual Portfolio Operating Expenses may be higher than the Portfolio’s ratio of expenses to average net assets shown in the Portfolio’s Financial Highlights, which reflects the operating expenses of the Portfolio and does not include Acquired Fund Fees and Expenses.
Expense Example: rr_ExpenseExampleAbstract  
Expense Example [Heading] rr_ExpenseExampleHeading
Expense Example $
Expense Example Narrative [Text Block] rr_ExpenseExampleNarrativeTextBlock The Example is intended to help you compare the cost of investing in shares of the Portfolio with the costs of investing in other mutual funds. The Example does not reflect expenses and charges which are, or may be, imposed under your Variable Contract or Qualified Plan. The Example assumes that you invest $10,000 in the Portfolio for the time periods indicated. The Example also assumes that your investment had a 5% return each year and that the Portfolio’s operating expenses remain the same. Although your actual costs may be higher or lower, based on these assumptions your costs would be:
Expense Example Closing [Text Block] rr_ExpenseExampleClosingTextBlock The Example reflects applicable expense limitation agreements and/or waivers in effect, if any, for the one-year period and the first year of the three-, five-, and ten-year periods.
Strategy [Heading] rr_StrategyHeading

PRINCIPAL INVESTMENT STRATEGIES
Strategy Narrative [Text Block] rr_StrategyNarrativeTextBlock

Under normal market conditions, the Portfolio invests at least 80% of its net assets (plus borrowings for investment purposes) in common stock of smaller, lesser-known U.S. companies. The Portfolio will provide shareholders with at least 60 days’ prior notice of any change in this investment policy.

The Portfolio normally invests in companies that the sub-adviser (“Sub-Adviser”) believes have above average prospects for growth. For this Portfolio, smaller companies are those with market capitalizations that fall within the range of companies in the Russell 2000® Growth Index at the time of purchase. The Russell 2000® Growth Index is an index that measures the performance of small growth companies. Capitalization of companies in the Russell 2000® Growth Index will change with market conditions. The market capitalization of companies in the Russell 2000® Growth Index as of December 31, 2011, ranged from $23.4 million to $3.7 billion.

The Portfolio may invest in other investment companies, including exchange-traded funds, to the extent permitted under the Investment Company Act of 1940, as amended, and the rules, regulations, and exemptive orders thereunder (“1940 Act”).

The Sub-Adviser uses a disciplined combination of quantitative screens and bottom-up fundamental security analysis to build a broadly diversified portfolio of companies that the Sub-Adviser believes will have improving bottom lines, with reasonable valuation, and whose stocks demonstrate relative strength. The focus of company analysis is upon the prospects for continuing bottom-line growth, balance sheet strength, and cash flow characteristics. A proprietary measure is used to determine relative stock price strength. A determination of reasonable valuation for individual securities is based on the judgment of the Sub-Adviser.

The Sub-Adviser may sell securities for a variety of reasons, such as to secure gains, limit losses, or redeploy assets into opportunities believed to be more promising, among others.

The Portfolio may lend portfolio securities on a short-term or long-term basis, up to 33% of its total assets.
Risk [Heading] rr_RiskHeading

PRINCIPAL RISKS
Risk Narrative [Text Block] rr_RiskNarrativeTextBlock

You could lose money on an investment in the Portfolio. Any of the following risks, among others, could affect Portfolio performance or cause the Portfolio to lose money or to underperform market averages of other funds.

Company The price of a given company’s stock could decline or underperform for many reasons including, among others, poor management, financial problems, or business challenges. If a company declares bankruptcy or becomes insolvent, its stock could become worthless.

Investment Model The manager’s proprietary model may not adequately allow for existing or unforeseen market factors or the interplay between such factors.

Liquidity If a security is illiquid, the Portfolio might be unable to sell the security at a time when the Portfolio’s manager might wish to sell, and the security could have the effect of decreasing the overall level of the Portfolio’s liquidity. Further, the lack of an established secondary market may make it more difficult to value illiquid securities, which could vary from the amount the Portfolio could realize upon disposition. The Portfolio may make investments that become less liquid in response to market developments or adverse investor perception. The Portfolio could lose money if it cannot sell a security at the time and price that would be most beneficial to the Portfolio.

Market Stock prices may be volatile and are affected by the real or perceived impacts of such factors as economic conditions and political events. The stock market tends to be cyclical, with periods when stock prices generally rise and periods when stock prices generally decline. Any given stock market segment may remain out of favor with investors for a short or long period of time, and stocks as an asset class may underperform bonds or other asset classes during some periods. From time to time, the stock market may not favor the growth-oriented securities in which the Portfolio invests. Rather, the market could favor value-oriented securities or may not favor equities at all.

Other Investment Companies The main risk of investing in other investment companies, including exchange-traded funds, is the risk that the value of the securities underlying an investment company might decrease. Because the Portfolio may invest in other investment companies, you will pay a proportionate share of the expenses of that other investment company (including management fees, administration fees, and custodial fees) in addition to the expenses of the Portfolio.

Securities Lending Securities lending involves two primary risks: “investment risk” and “borrower default risk.” Investment risk is the risk that the Portfolio will lose money from the investment of the cash collateral received from the borrower. Borrower default risk is the risk that the Portfolio will lose money due to the failure of a borrower to return a borrowed security in a timely manner.

Small-Capitalization Company Investments in small-capitalization companies may involve greater risk than is customarily associated with larger, more established companies due to the greater business risks of small size, limited markets and financial resources, narrow product lines and the frequent lack of depth of management. The securities of smaller companies are often traded over-the-counter and may not be traded in volume typical on a national securities exchange.

An investment in the Portfolio is not a bank deposit and is not insured or guaranteed by the Federal Deposit Insurance Corporation, the Federal Reserve Board or any other government agency.
Risk Lose Money [Text] rr_RiskLoseMoney You could lose money on an investment in the Portfolio.
Risk Not Insured Depository Institution [Text] rr_RiskNotInsuredDepositoryInstitution An investment in the Portfolio is not a bank deposit and is not insured or guaranteed by the Federal Deposit Insurance Corporation, the Federal Reserve Board or any other government agency.
Bar Chart and Performance Table [Heading] rr_BarChartAndPerformanceTableHeading

PERFORMANCE INFORMATION
Performance Narrative [Text Block] rr_PerformanceNarrativeTextBlock The following information is intended to help you understand the risks of investing in the Portfolio. The following bar chart shows the changes in the Portfolio’s Class S shares’ performance from year to year, and the table compares the Portfolio’s Class S shares’ performance to the performance of a broad-based securities market index/indices for the same period. The Portfolio’s performance information reflects applicable fee waivers and/or expense limitations in effect during the period presented. Absent such fee waivers/expense limitations, if any, performance would have been lower. Performance in the Average Annual Total Returns table does not include insurance-related charges imposed under a Variable Contract or expenses related to a Qualified Plan. If these charges or expenses were included, performance would be lower. Thus, you should not compare the Portfolio’s performance directly with the performance information of other investment products without taking into account all insurance-related charges and expenses payable under your Variable Contract or Qualified Plan. The Portfolio’s past performance is no guarantee of future results.
Performance Information Illustrates Variability of Returns [Text] rr_PerformanceInformationIllustratesVariabilityOfReturns The following bar chart shows the changes in the Portfolio’s Class S shares’ performance from year to year, and the table compares the Portfolio’s Class S shares’ performance to the performance of a broad-based securities market index/indices for the same period.
Performance Past Does Not Indicate Future [Text] rr_PerformancePastDoesNotIndicateFuture The Portfolio’s past performance is no guarantee of future results.
Bar Chart Table: rr_BarChartTableAbstract  
Bar Chart [Heading] rr_BarChartHeading
Calendar Year Total Returns
(as of December 31 of each year)
Bar Chart Closing [Text Block] rr_BarChartClosingTextBlock Best quarter: 2nd, 2009, 22.78% and Worst quarter: 4th, 2008, (25.29)%
Average Annual Return: rr_AverageAnnualReturnAbstract  
Performance Table Heading rr_PerformanceTableHeading
Average Annual Total Returns%
(for the periods ended December 31, 2011)
Index No Deduction for Fees, Expenses, Taxes [Text] rr_IndexNoDeductionForFeesExpensesTaxes The index returns do not reflect deductions for fees, expenses, or taxes.
Class S Shares | ING SmallCap Opportunities Portfolio | Class S
  
Operating Expenses: rr_OperatingExpensesAbstract  
Management Fee rr_ManagementFeesOverAssets 0.75%
Distribution and/or Shareholder Services (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.25%
Administrative Services Fee rr_Component1OtherExpensesOverAssets 0.10%
Other Expenses rr_OtherExpensesOverAssets 0.05%
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.01%
Total Annual Portfolio Operating Expenses rr_ExpensesOverAssets 1.16% [7]
Waivers and Reimbursements rr_FeeWaiverOrReimbursementOverAssets none [14]
Total Annual Portfolio Operating Expenses After Waivers and Reimbursements rr_NetExpensesOverAssets 1.16%
Expense Example: rr_ExpenseExampleAbstract  
1 Yr rr_ExpenseExampleYear01 118
3 Yrs rr_ExpenseExampleYear03 368
5 Yrs rr_ExpenseExampleYear05 638
10 Yrs rr_ExpenseExampleYear10 1,409
Bar Chart Table: rr_BarChartTableAbstract  
2002 rr_AnnualReturn2002 (43.74%)
2003 rr_AnnualReturn2003 38.36%
2004 rr_AnnualReturn2004 9.95%
2005 rr_AnnualReturn2005 8.86%
2006 rr_AnnualReturn2006 12.35%
2007 rr_AnnualReturn2007 9.83%
2008 rr_AnnualReturn2008 (34.59%)
2009 rr_AnnualReturn2009 30.71%
2010 rr_AnnualReturn2010 32.06%
2011 rr_AnnualReturn2011 0.53%
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel Best quarter:
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Jun. 30, 2009
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 22.78%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel Worst quarter:
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Dec. 31, 2008
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (25.29%)
Average Annual Return: rr_AverageAnnualReturnAbstract  
1 Yr rr_AverageAnnualReturnYear01 0.53%
5 Yrs rr_AverageAnnualReturnYear05 4.50%
10 Yrs rr_AverageAnnualReturnYear10 2.69%
Inception Date rr_AverageAnnualReturnInceptionDate May 03, 2001
Class S Shares | ING SmallCap Opportunities Portfolio | Russell 2000 Growth Index
  
Average Annual Return: rr_AverageAnnualReturnAbstract  
1 Yr rr_AverageAnnualReturnYear01 (2.91%) [6]
5 Yrs rr_AverageAnnualReturnYear05 2.09% [6]
10 Yrs rr_AverageAnnualReturnYear10 4.48% [6]
Class S Shares | ING SmallCap Opportunities Portfolio | Russell 2000 Index
  
Average Annual Return: rr_AverageAnnualReturnAbstract  
1 Yr rr_AverageAnnualReturnYear01 (4.18%) [6]
5 Yrs rr_AverageAnnualReturnYear05 0.15% [6]
10 Yrs rr_AverageAnnualReturnYear10 5.62% [6]
Class S2 Shares | ING International Value Portfolio
  
Risk/Return: rr_RiskReturnAbstract  
Risk/Return [Heading] rr_RiskReturnHeading

ING International Value Portfolio
Objective [Heading] rr_ObjectiveHeading

INVESTMENT OBJECTIVE
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock The Portfolio seeks long-term capital appreciation.
Expense [Heading] rr_ExpenseHeading

FEES AND EXPENSES OF THE PORTFOLIO
Expense Narrative [Text Block] rr_ExpenseNarrativeTextBlock The table describes the fees and expenses that you may pay if you buy and hold shares of the Portfolio. The table does not reflect fees or expenses that are, or may be, imposed under your variable annuity contracts or variable life insurance policies (“Variable Contract”) or a qualified pension or retirement plan (“Qualified Plan”). For more information on these charges, please refer to the documents governing your Variable Contract or consult your plan administrator.
Operating Expenses: rr_OperatingExpensesAbstract  
Operating Expenses Caption [Text] rr_OperatingExpensesCaption
Annual Portfolio Operating Expenses
Expenses you pay each year as a % of the value of your investment
Fee Waiver or Reimbursement over Assets, Date of Termination rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination May 1, 2013
Portfolio Turnover [Heading] rr_PortfolioTurnoverHeading
Portfolio Turnover % of average value of portfolio
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 transactions costs. These costs, which are not reflected in Annual Portfolio Operating Expenses or in the Expense Example, affect the Portfolio’s performance.

During the most recent fiscal year, the Portfolio’s portfolio turnover rate was 69% of the average value of its portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 69.00%
Expense Example: rr_ExpenseExampleAbstract  
Expense Example [Heading] rr_ExpenseExampleHeading
Expense Example $
Expense Example Narrative [Text Block] rr_ExpenseExampleNarrativeTextBlock The Example is intended to help you compare the cost of investing in shares of the Portfolio with the costs of investing in other mutual funds. The Example does not reflect expenses and charges which are, or may be, imposed under your Variable Contract or Qualified Plan. The Example assumes that you invest $10,000 in the Portfolio for the time periods indicated. The Example also assumes that your investment had a 5% return each year and that the Portfolio’s operating expenses remain the same. Although your actual costs may be higher or lower, based on these assumptions your costs would be:
Expense Example Closing [Text Block] rr_ExpenseExampleClosingTextBlock The Example reflects applicable expense limitation agreements and/or waivers in effect, if any, for the one-year period and the first year of the three-, five-, and ten-year periods.
Strategy [Heading] rr_StrategyHeading

PRINCIPAL INVESTMENT STRATEGIES
Strategy Narrative [Text Block] rr_StrategyNarrativeTextBlock

Under normal market conditions, the Portfolio invests at least 65% of its net assets in equity securities of companies located in a number of different countries outside of the United States. The Portfolio invests primarily in companies with a large market capitalization, but may also invest in small- and mid-sized companies. The Portfolio generally invests in common and preferred stocks, warrants, and convertible securities. The Portfolio may invest in companies located in countries with emerging securities markets when the sub-adviser (“Sub-Adviser”) believes they present attractive investment opportunities. The Portfolio may invest in government debt securities of developed foreign countries. The Portfolio may also invest up to 35% of its assets in securities of U.S. issuers, including investment-grade government and corporate debt securities.

The Portfolio may invest in derivative instruments including futures, options, and swaps. The Portfolio typically uses derivatives to hedge against currency risk and for purposes of maintaining equity market exposure on its cash balance.

The Portfolio may invest in other investment companies, including exchange-traded funds, to the extent permitted under the Investment Company Act of 1940, as amended, and the rules, regulations, and exemptive orders thereunder (“1940 Act”).

The Sub-Adviser primarily uses a bottom-up fundamental analysis to identify stocks which it believes offer good value relative to their peers in the same industry, sector, or region. It also uses a top-down analysis to identify important themes or issues which may affect the investment environment in certain regions or sectors and to estimate regional market risks. In conducting its fundamental analysis, the Sub-Adviser focuses on various factors including valuation of the companies, catalysts to stock price appreciation, quality of management, and financial measures, especially cash flow and cash flow return on capital.

The Sub-Adviser may sell securities for a variety of reasons, such as to secure gains, limit losses, or redeploy assets into opportunities believed to be more promising, among others.

The Portfolio may lend portfolio securities on a short-term or long-term basis, up to 331 / 3 % of its total assets.
Risk [Heading] rr_RiskHeading

PRINCIPAL RISKS
Risk Narrative [Text Block] rr_RiskNarrativeTextBlock

You could lose money on an investment in the Portfolio. Any of the following risks, among others, could affect Portfolio performance or cause the Portfolio to lose money or to underperform market averages of other funds.

Company The price of a given company’s stock could decline or underperform for many reasons including, among others, poor management, financial problems, or business challenges. If a company declares bankruptcy or becomes insolvent, its stock could become worthless.

Convertible Securities Convertible securities are securities that are convertible into or exercisable for common stocks at a stated price or rate. Convertible securities are subject to the usual risks associated with debt securities, such as interest rate and credit risk. In addition, because convertible securities react to changes in the value of the stocks into which they convert, they are subject to market risk.

Credit Prices of bonds and other debt securities can fall if the issuer’s actual or perceived financial health deteriorates, whether because of broad economic or issuer-specific reasons. In certain cases, the issuer could be late in paying interest or principal, or could fail to pay altogether.

Currency To the extent that the Portfolio invests directly in foreign currencies or in securities denominated in, or that trade in, foreign (non-U.S.) currencies, it is subject to the risk that those currencies will decline in value relative to the U.S. dollar or, in the case of hedging positions, that the U.S. dollar will decline in value relative to the currency being hedged.

Derivative Instruments Derivative instruments are subject to a number of risks, including the risk of changes in the market price of the underlying securities, credit risk with respect to the counterparty, risk of loss due to changes in interest rates and liquidity risk. The use of certain derivatives may also have a leveraging effect which may increase the volatility of the Portfolio and reduce its returns.

Foreign Investments/Developing and Emerging Markets Investing in foreign (non-U.S.) securities may result in the Portfolio experiencing more rapid and extreme changes in value than a fund that invests exclusively in securities of U.S. companies, due to smaller markets, differing reporting, accounting and auditing standards, and nationalization, expropriation or confiscatory taxation, foreign currency fluctuations, currency blockage, or replacement, potential for default on sovereign debt, or political changes or diplomatic developments. Foreign investment risks may be greater in developing and emerging markets than in developed markets.

Interest Rate With bonds and other fixed rate debt securities, a rise in interest rates generally causes values to fall; conversely, values generally rise as interest rates fall. The higher the credit quality of the security, and the longer its maturity or duration, the more sensitive it is likely to be to interest rate risk.

Liquidity If a security is illiquid, the Portfolio might be unable to sell the security at a time when the Portfolio’s manager might wish to sell, and the security could have the effect of decreasing the overall level of the Portfolio’s liquidity. Further, the lack of an established secondary market may make it more difficult to value illiquid securities, which could vary from the amount the Portfolio could realize upon disposition. The Portfolio may make investments that become less liquid in response to market developments or adverse investor perception. The Portfolio could lose money if it cannot sell a security at the time and price that would be most beneficial to the Portfolio.

Market Stock prices may be volatile and are affected by the real or perceived impacts of such factors as economic conditions and political events. The stock market tends to be cyclical, with periods when stock prices generally rise and periods when stock prices generally decline. Any given stock market segment may remain out of favor with investors for a short or long period of time, and stocks as an asset class may underperform bonds or other asset classes during some periods. From time to time, the stock market may not favor the value-oriented securities in which the Portfolio invests. Rather, the market could favor growth-oriented securities or may not favor equities at all.

Market Capitalization Stocks fall into three broad market capitalization categories - large, mid, and small. Investing primarily in one category carries the risk that, due to current market conditions, that category may be out of favor with investors. If valuations of large-capitalization companies appear to be greatly out of proportion to the valuations of mid- or small-capitalization companies, investors may migrate to the stocks of mid- and small-sized companies causing the Portfolio that invests in these companies to increase in value more rapidly than a fund that invests in larger, fully-valued companies. Investing in mid- and small-capitalization companies may be subject to special risks associated with narrower product lines, more limited financial resources, smaller management groups, and a more limited trading market for their stocks as compared with larger companies. As a result, stocks of mid- and small-capitalization companies may decline significantly in market downturns.

Other Investment Companies The main risk of investing in other investment companies, including exchange-traded funds, is the risk that the value of the securities underlying an investment company might decrease. Because the Portfolio may invest in other investment companies, you will pay a proportionate share of the expenses of that other investment company (including management fees, administration fees, and custodial fees) in addition to the expenses of the Portfolio.

Securities Lending Securities lending involves two primary risks: “investment risk” and “borrower default risk.” Investment risk is the risk that the Portfolio will lose money from the investment of the cash collateral received from the borrower. Borrower default risk is the risk that the Portfolio will lose money due to the failure of a borrower to return a borrowed security in a timely manner.

Sovereign Debt These securities are issued or guaranteed by foreign government entities. Investments in sovereign debt are subject to the risk that a government entity may delay payment, restructure its debt, or refuse to pay interest or repay principal on its sovereign debt. Some of these reasons may include cash flow problems, insufficient foreign currency reserves, political considerations, the relative size of its debt position to its economy or its failure to put in place economic reforms required by the International Monetary Fund or other multilateral agencies. If a government entity defaults, it may ask for more time in which to pay or for further loans. There is no legal process for collecting sovereign debts that a government does not pay or bankruptcy proceeding by which all or part of sovereign debt that a government entity has not repaid may be collected.

U.S. Government Securities and Obligations U.S. government securities are obligations of, or guaranteed by, the U.S. government, its agencies or government-sponsored enterprises. U.S. government securities are subject to market and interest rate risk, and may be subject to varying degrees of credit risk.

Value Investing Securities that appear to be undervalued may never appreciate to the extent expected. Further, because the prices of value-oriented securities tend to correlate more closely with economic cycles than growth-oriented securities, they generally are more sensitive to changing economic conditions, such as changes in interest rates, corporate earnings and industrial production.

An investment in the Portfolio is not a bank deposit and is not insured or guaranteed by the Federal Deposit Insurance Corporation, the Federal Reserve Board or any other government agency.

Risk Lose Money [Text] rr_RiskLoseMoney You could lose money on an investment in the Portfolio.
Risk Not Insured Depository Institution [Text] rr_RiskNotInsuredDepositoryInstitution An investment in the Portfolio is not a bank deposit and is not insured or guaranteed by the Federal Deposit Insurance Corporation, the Federal Reserve Board or any other government agency.
Bar Chart and Performance Table [Heading] rr_BarChartAndPerformanceTableHeading

PERFORMANCE INFORMATION
Performance Narrative [Text Block] rr_PerformanceNarrativeTextBlock The following information is intended to help you understand the risks of investing in the Portfolio. The following bar chart shows the changes in the Portfolio’s Class S2 shares’ and Class I shares’ performance from year to year, and the table compares the Portfolio’s Class S2 shares’ and Class I shares’ performance to the performance of a broad-based securities market index/indices for the same period. Class I shares’ performance has been adjusted to reflect the higher expenses of Class S2 shares. The Class S2 shares and Class I shares of the Portfolio would have substantially similar performance because they invest in the same portfolio of securities. However, Class I shares’ performance would be higher than Class S2 shares’ performance because of the higher expenses paid by Class S2 shares. The Portfolio’s performance information reflects applicable fee waivers and/or expense limitations in effect during the period presented. Absent such fee waivers/expense limitations, if any, performance would have been lower. Performance in the Average Annual Total Returns table does not include insurance-related charges imposed under a Variable Contract or expenses related to a Qualified Plan. If these charges or expenses were included, performance would be lower. Thus, you should not compare the Portfolio’s performance directly with the performance information of other investment products without taking into account all insurance-related charges and expenses payable under your Variable Contract or Qualified Plan. The Portfolio’s past performance is no guarantee of future results.
Performance Information Illustrates Variability of Returns [Text] rr_PerformanceInformationIllustratesVariabilityOfReturns The following bar chart shows the changes in the Portfolio’s Class S2 shares’ and Class I shares’ performance from year to year, and the table compares the Portfolio’s Class S2 shares’ and Class I shares’ performance to the performance of a broad-based securities market index/indices for the same period.
Performance Past Does Not Indicate Future [Text] rr_PerformancePastDoesNotIndicateFuture The Portfolio’s past performance is no guarantee of future results.
Bar Chart Table: rr_BarChartTableAbstract  
Bar Chart [Heading] rr_BarChartHeading
Calendar Year Total Returns
(as of December 31 of each year)
Bar Chart Narrative [Text Block] rr_BarChartNarrativeTextBlock The bar chart below shows the Portfolio’s adjusted Class I shares’ performance (2002-2009) and Class S2 shares’ performance (2010-2011).
Bar Chart Closing [Text Block] rr_BarChartClosingTextBlock Best quarter: 2nd, 2009, 26.75% and Worst quarter: 3rd, 2011, (22.87)%
Average Annual Return: rr_AverageAnnualReturnAbstract  
Performance Table Heading rr_PerformanceTableHeading
Average Annual Total Returns%
(for the periods ended December 31, 2011)
Index No Deduction for Fees, Expenses, Taxes [Text] rr_IndexNoDeductionForFeesExpensesTaxes The index returns include the reinvestment of dividends and distributions net of withholding taxes, but do not reflect fees, brokerage commissions, or other expenses.
Class S2 Shares | ING International Value Portfolio | Class S2
  
Operating Expenses: rr_OperatingExpensesAbstract  
Management Fee rr_ManagementFeesOverAssets 0.80%
Distribution and/or Shareholder Services (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.50%
Administrative Services Fee rr_Component1OtherExpensesOverAssets 0.10%
Other Expenses rr_OtherExpensesOverAssets 0.16%
Total Annual Portfolio Operating Expenses rr_ExpensesOverAssets 1.56%
Waivers and Reimbursements rr_FeeWaiverOrReimbursementOverAssets (0.15%) [15]
Total Annual Portfolio Operating Expenses After Waivers and Reimbursements rr_NetExpensesOverAssets 1.41%
Expense Example: rr_ExpenseExampleAbstract  
1 Yr rr_ExpenseExampleYear01 144
3 Yrs rr_ExpenseExampleYear03 478
5 Yrs rr_ExpenseExampleYear05 836
10 Yrs rr_ExpenseExampleYear10 1,844
Bar Chart Table: rr_BarChartTableAbstract  
2010 rr_AnnualReturn2010 2.09%
2011 rr_AnnualReturn2011 (15.27%)
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel Worst quarter:
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Sep. 30, 2011
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (22.87%)
Average Annual Return: rr_AverageAnnualReturnAbstract  
1 Yr rr_AverageAnnualReturnYear01 (15.27%)
5 Yrs rr_AverageAnnualReturnYear05   
10 Yrs rr_AverageAnnualReturnYear10   
Since Inception rr_AverageAnnualReturnSinceInception 11.53%
Inception Date rr_AverageAnnualReturnInceptionDate Feb. 27, 2009
Class S2 Shares | ING International Value Portfolio | Class I
  
Bar Chart Table: rr_BarChartTableAbstract  
2002 rr_AnnualReturn2002 (15.79%)
2003 rr_AnnualReturn2003 29.40%
2004 rr_AnnualReturn2004 16.96%
2005 rr_AnnualReturn2005 9.00%
2006 rr_AnnualReturn2006 28.93%
2007 rr_AnnualReturn2007 12.98%
2008 rr_AnnualReturn2008 (42.99%)
2009 rr_AnnualReturn2009 26.67%
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel Best quarter:
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Jun. 30, 2009
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 26.75%
Average Annual Return: rr_AverageAnnualReturnAbstract  
1 Yr rr_AverageAnnualReturnYear01 (15.30%) [2]
5 Yrs rr_AverageAnnualReturnYear05 (6.74%) [2]
10 Yrs rr_AverageAnnualReturnYear10 2.36% [2]
Inception Date rr_AverageAnnualReturnInceptionDate Aug. 08, 1997 [2]
Class S2 Shares | ING International Value Portfolio | MSCI EAFE Index | Class S2
  
Average Annual Return: rr_AverageAnnualReturnAbstract  
1 Yr rr_AverageAnnualReturnYear01 (12.14%) [3]
5 Yrs rr_AverageAnnualReturnYear05    [3]
10 Yrs rr_AverageAnnualReturnYear10    [3]
Since Inception rr_AverageAnnualReturnSinceInception 16.50% [3],[4]
Class S2 Shares | ING International Value Portfolio | MSCI EAFE Index | Class I
  
Average Annual Return: rr_AverageAnnualReturnAbstract  
1 Yr rr_AverageAnnualReturnYear01 (12.14%) [3]
5 Yrs rr_AverageAnnualReturnYear05 (4.72%) [3]
10 Yrs rr_AverageAnnualReturnYear10 4.67% [3]
Class S2 Shares | ING MidCap Opportunities Portfolio
  
Risk/Return: rr_RiskReturnAbstract  
Risk/Return [Heading] rr_RiskReturnHeading

ING MidCap Opportunities Portfolio
Objective [Heading] rr_ObjectiveHeading

INVESTMENT OBJECTIVE
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock The Portfolio seeks long-term capital appreciation.
Expense [Heading] rr_ExpenseHeading

FEES AND EXPENSES OF THE PORTFOLIO
Expense Narrative [Text Block] rr_ExpenseNarrativeTextBlock The table describes the fees and expenses that you may pay if you buy and hold shares of the Portfolio. The table does not reflect fees or expenses that are, or may be, imposed under your variable annuity contracts or variable life insurance policies (“Variable Contract”) or a qualified pension or retirement plan (“Qualified Plan”). For more information on these charges, please refer to the documents governing your Variable Contract or consult your plan administrator.
Operating Expenses: rr_OperatingExpensesAbstract  
Operating Expenses Caption [Text] rr_OperatingExpensesCaption
Annual Portfolio Operating Expenses
Expenses you pay each year as a % of the value of your investment
Fee Waiver or Reimbursement over Assets, Date of Termination rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination May 2, 2013
Portfolio Turnover [Heading] rr_PortfolioTurnoverHeading
Portfolio Turnover % of average value of portfolio
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 transactions costs. These costs, which are not reflected in Annual Portfolio Operating Expenses or in the Expense Example, affect the Portfolio’s performance.

During the most recent fiscal year, the Portfolio’s portfolio turnover rate was 90% of the average value of its portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 90.00%
Expense Example: rr_ExpenseExampleAbstract  
Expense Example [Heading] rr_ExpenseExampleHeading
Expense Example $
Expense Example Narrative [Text Block] rr_ExpenseExampleNarrativeTextBlock The Example is intended to help you compare the cost of investing in shares of the Portfolio with the costs of investing in other mutual funds. The Example does not reflect expenses and charges which are, or may be, imposed under your Variable Contract or Qualified Plan. The Example assumes that you invest $10,000 in the Portfolio for the time periods indicated. The Example also assumes that your investment had a 5% return each year and that the Portfolio’s operating expenses remain the same. Although your actual costs may be higher or lower, based on these assumptions your costs would be:
Expense Example Closing [Text Block] rr_ExpenseExampleClosingTextBlock The Example reflects applicable expense limitation agreements and/or waivers in effect, if any, for the one-year period and the first year of the three-, five-, and ten-year periods.
Strategy [Heading] rr_StrategyHeading

PRINCIPAL INVESTMENT STRATEGIES
Strategy Narrative [Text Block] rr_StrategyNarrativeTextBlock

Under normal market conditions, the Portfolio invests at least 80% of its net assets (plus borrowings for investment purposes) in common stock of mid-sized U.S. companies. The Portfolio will provide shareholders with at least 60 days’ prior notice of any change in this investment policy.

The Portfolio normally invests in companies that the sub-adviser (“Sub-Adviser”) believes have above average prospects for growth. For this Portfolio, mid-sized companies are those companies with market capitalizations that fall within the range of companies in the Russell Midcap® Growth Index at the time of purchase. Capitalization of companies in the Russell Midcap® Growth Index will change with market conditions. The market capitalization of companies in the Russell Midcap® Growth Index as of December 31, 2011, ranged from $117.3 million to $20.5 billion.

The Portfolio may also invest in derivative instruments including futures or index futures that have a similar profile to the benchmark of the Portfolio. The Portfolio typically uses derivatives for the purpose of maintaining equity market exposure on its cash balance. The Portfolio may also invest in foreign securities.

The Portfolio may invest in other investment companies, including exchange-traded funds, to the extent permitted under the Investment Company Act of 1940, as amended, and the rules, regulations, and exemptive orders thereunder (“1940 Act”).

The Sub-Adviser uses a stock selection process that combines the discipline of quantitative screens with rigorous fundamental security analysis. The quantitative screens focus the fundamental analysis by seeking to identify the stocks of companies with strong business momentum that demonstrate relative price strength, and have a perceived value not reflected in the current price. The objective of the fundamental analysis is to confirm the persistence of the company’s revenue and earnings growth and validate the Sub-Adviser’s expectations for earnings estimate revisions, particularly relative to consensus. A determination of reasonable valuation for individual securities is based on the judgment of the Sub-Adviser.

The Sub-Adviser may sell securities for a variety of reasons, such as to secure gains, limit losses, or redeploy assets into opportunities believed to be more promising, among others.

The Portfolio may lend portfolio securities on a short-term or long-term basis, up to 33% of its total assets.
Risk [Heading] rr_RiskHeading

PRINCIPAL RISKS
Risk Narrative [Text Block] rr_RiskNarrativeTextBlock

You could lose money on an investment in the Portfolio. Any of the following risks, among others, could affect Portfolio performance or cause the Portfolio to lose money or to underperform market averages of other funds.

Company The price of a given company’s stock could decline or underperform for many reasons including, among others, poor management, financial problems, or business challenges. If a company declares bankruptcy or becomes insolvent, its stock could become worthless.

Currency To the extent that the Portfolio invests directly in foreign currencies or in securities denominated in, or that trade in, foreign (non-U.S.) currencies, it is subject to the risk that those currencies will decline in value relative to the U.S. dollar or, in the case of hedging positions, that the U.S. dollar will decline in value relative to the currency being hedged.

Derivative Instruments Derivative instruments are subject to a number of risks, including the risk of changes in the market price of the underlying securities, credit risk with respect to the counterparty, risk of loss due to changes in interest rates and liquidity risk. The use of certain derivatives may also have a leveraging effect which may increase the volatility of the Portfolio and reduce its returns.

Foreign Investments Investing in foreign (non-U.S.) securities may result in the Portfolio experiencing more rapid and extreme changes in value than a fund that invests exclusively in securities of U.S. companies due to smaller markets, differing reporting, accounting and auditing standards, and nationalization, expropriation or confiscatory taxation, foreign currency fluctuations, currency blockage or replacement, potential for default on sovereign debt, or political changes or diplomatic developments.

Investment Model The manager’s proprietary model may not adequately allow for existing or unforeseen market factors or the interplay between such factors.

Liquidity If a security is illiquid, the Portfolio might be unable to sell the security at a time when the Portfolio’s manager might wish to sell, and the security could have the effect of decreasing the overall level of the Portfolio’s liquidity. Further, the lack of an established secondary market may make it more difficult to value illiquid securities, which could vary from the amount the Portfolio could realize upon disposition. The Portfolio may make investments that become less liquid in response to market developments or adverse investor perception. The Portfolio could lose money if it cannot sell a security at the time and price that would be most beneficial to the Portfolio.

Market Stock prices may be volatile and are affected by the real or perceived impacts of such factors as economic conditions and political events. The stock market tends to be cyclical, with periods when stock prices generally rise and periods when stock prices generally decline. Any given stock market segment may remain out of favor with investors for a short or long period of time, and stocks as an asset class may underperform bonds or other asset classes during some periods. From time to time, the stock market may not favor the growth-oriented securities in which the Portfolio invests. Rather, the market could favor value-oriented securities or may not favor equities at all.

Mid-Capitalization Company Investments in mid-capitalization companies may involve greater risk than is customarily associated with larger, more established companies due to the greater business risks of smaller size, limited markets and financial resources, narrow product lines and the frequent lack of depth of management. Consequently, the securities of smaller companies may have limited market stability and may be subject to more abrupt or erratic market movements than securities of larger, more established growth companies or the market averages in general.

Other Investment Companies The main risk of investing in other investment companies, including exchange-traded funds, is the risk that the value of the securities underlying an investment company might decrease. Because the Portfolio may invest in other investment companies, you will pay a proportionate share of the expenses of that other investment company (including management fees, administration fees, and custodial fees) in addition to the expenses of the Portfolio.

Securities Lending Securities lending involves two primary risks: “investment risk” and “borrower default risk.” Investment risk is the risk that the Portfolio will lose money from the investment of the cash collateral received from the borrower. Borrower default risk is the risk that the Portfolio will lose money due to the failure of a borrower to return a borrowed security in a timely manner.

An investment in the Portfolio is not a bank deposit and is not insured or guaranteed by the Federal Deposit Insurance Corporation, the Federal Reserve Board or any other government agency.
Risk Lose Money [Text] rr_RiskLoseMoney You could lose money on an investment in the Portfolio.
Risk Not Insured Depository Institution [Text] rr_RiskNotInsuredDepositoryInstitution An investment in the Portfolio is not a bank deposit and is not insured or guaranteed by the Federal Deposit Insurance Corporation, the Federal Reserve Board or any other government agency.
Bar Chart and Performance Table [Heading] rr_BarChartAndPerformanceTableHeading

PERFORMANCE INFORMATION
Performance Narrative [Text Block] rr_PerformanceNarrativeTextBlock The following information is intended to help you understand the risks of investing in the Portfolio. The following bar chart shows the changes in the Portfolio’s Class S2 shares’ and Class I shares’ performance from year to year, and the table compares the Portfolio’s Class S2 shares’ and Class I shares’ performance to the performance of a broad-based securities market index/indices for the same period. Class I shares’ performance has been adjusted to reflect the higher expenses of Class S2 shares. The Class S2 shares and Class I shares of the Portfolio would have substantially similar performance because they invest in the same portfolio of securities. However, Class I shares’ performance would be higher than Class S2 shares’ performance because of the higher expenses paid by Class S2 shares. The Portfolio’s performance information reflects applicable fee waivers and/or expense limitations in effect during the period presented. Absent such fee waivers/expense limitations, if any, performance would have been lower. Performance in the Average Annual Total Returns table does not include insurance-related charges imposed under a Variable Contract or expenses related to a Qualified Plan. If these charges or expenses were included, performance would be lower. Thus, you should not compare the Portfolio’s performance directly with the performance information of other investment products without taking into account all insurance-related charges and expenses payable under your Variable Contract or Qualified Plan. The Portfolio’s past performance is no guarantee of future results.
Performance Information Illustrates Variability of Returns [Text] rr_PerformanceInformationIllustratesVariabilityOfReturns The following bar chart shows the changes in the Portfolio’s Class S2 shares’ and Class I shares’ performance from year to year, and the table compares the Portfolio’s Class S2 shares’ and Class I shares’ performance to the performance of a broad-based securities market index/indices for the same period.
Performance Past Does Not Indicate Future [Text] rr_PerformancePastDoesNotIndicateFuture The Portfolio’s past performance is no guarantee of future results.
Bar Chart Table: rr_BarChartTableAbstract  
Bar Chart [Heading] rr_BarChartHeading
Calendar Year Total Returns
(as of December 31 of each year)
Bar Chart Narrative [Text Block] rr_BarChartNarrativeTextBlock The bar chart below shows the Portfolio’s adjusted Class I shares’ performance (2002-2009) and Class S2 shares’ performance (2010-2011).
Bar Chart Closing [Text Block] rr_BarChartClosingTextBlock Best quarter: 3rd, 2009, 17.71% and Worst quarter: 4th, 2008, (23.44)%
Average Annual Return: rr_AverageAnnualReturnAbstract  
Performance Table Heading rr_PerformanceTableHeading
Average Annual Total Returns%
(for the periods ended December 31, 2011)
Index No Deduction for Fees, Expenses, Taxes [Text] rr_IndexNoDeductionForFeesExpensesTaxes The index returns do not reflect deductions for fees, expenses, or taxes.
Class S2 Shares | ING MidCap Opportunities Portfolio | Class S2
  
Operating Expenses: rr_OperatingExpensesAbstract  
Management Fee rr_ManagementFeesOverAssets 0.70%
Distribution and/or Shareholder Services (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.50%
Administrative Services Fee rr_Component1OtherExpensesOverAssets 0.10%
Other Expenses rr_OtherExpensesOverAssets 0.04%
Total Annual Portfolio Operating Expenses rr_ExpensesOverAssets 1.34%
Waivers and Reimbursements rr_FeeWaiverOrReimbursementOverAssets (0.10%) [16]
Total Annual Portfolio Operating Expenses After Waivers and Reimbursements rr_NetExpensesOverAssets 1.24%
Expense Example: rr_ExpenseExampleAbstract  
1 Yr rr_ExpenseExampleYear01 126
3 Yrs rr_ExpenseExampleYear03 415
5 Yrs rr_ExpenseExampleYear05 725
10 Yrs rr_ExpenseExampleYear10 1,604
Bar Chart Table: rr_BarChartTableAbstract  
2010 rr_AnnualReturn2010 29.67%
2011 rr_AnnualReturn2011 (0.96%)
Average Annual Return: rr_AverageAnnualReturnAbstract  
1 Yr rr_AverageAnnualReturnYear01 (0.96%)
5 Yrs rr_AverageAnnualReturnYear05   
10 Yrs rr_AverageAnnualReturnYear10   
Since Inception rr_AverageAnnualReturnSinceInception 28.97%
Inception Date rr_AverageAnnualReturnInceptionDate Feb. 27, 2009
Class S2 Shares | ING MidCap Opportunities Portfolio | Class I
  
Bar Chart Table: rr_BarChartTableAbstract  
2002 rr_AnnualReturn2002 (26.16%)
2003 rr_AnnualReturn2003 36.13%
2004 rr_AnnualReturn2004 11.10%
2005 rr_AnnualReturn2005 9.90%
2006 rr_AnnualReturn2006 7.38%
2007 rr_AnnualReturn2007 25.23%
2008 rr_AnnualReturn2008 (37.87%)
2009 rr_AnnualReturn2009 40.92%
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel Best quarter:
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Sep. 30, 2009
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 17.71%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel Worst quarter:
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Dec. 31, 2008
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (23.44%)
Average Annual Return: rr_AverageAnnualReturnAbstract  
1 Yr rr_AverageAnnualReturnYear01 (0.91%) [2]
5 Yrs rr_AverageAnnualReturnYear05 7.12% [2]
10 Yrs rr_AverageAnnualReturnYear10 6.39% [2]
Inception Date rr_AverageAnnualReturnInceptionDate May 05, 2000 [2]
Class S2 Shares | ING MidCap Opportunities Portfolio | Russell Midcap Growth Index | Class S2
  
Average Annual Return: rr_AverageAnnualReturnAbstract  
1 Yr rr_AverageAnnualReturnYear01 (1.65%) [6]
5 Yrs rr_AverageAnnualReturnYear05    [6]
10 Yrs rr_AverageAnnualReturnYear10    [6]
Since Inception rr_AverageAnnualReturnSinceInception 29.08% [4],[6]
Class S2 Shares | ING MidCap Opportunities Portfolio | Russell Midcap Growth Index | Class I
  
Average Annual Return: rr_AverageAnnualReturnAbstract  
1 Yr rr_AverageAnnualReturnYear01 (1.65%) [6]
5 Yrs rr_AverageAnnualReturnYear05 2.44% [6]
10 Yrs rr_AverageAnnualReturnYear10 5.29% [6]
Class S2 Shares | ING MidCap Opportunities Portfolio | Russell Midcap Index | Class S2
  
Average Annual Return: rr_AverageAnnualReturnAbstract  
1 Yr rr_AverageAnnualReturnYear01 (1.55%) [6]
5 Yrs rr_AverageAnnualReturnYear05    [6]
10 Yrs rr_AverageAnnualReturnYear10    [6]
Since Inception rr_AverageAnnualReturnSinceInception 29.52% [4],[6]
Class S2 Shares | ING MidCap Opportunities Portfolio | Russell Midcap Index | Class I
  
Average Annual Return: rr_AverageAnnualReturnAbstract  
1 Yr rr_AverageAnnualReturnYear01 (1.55%) [6]
5 Yrs rr_AverageAnnualReturnYear05 1.41% [6]
10 Yrs rr_AverageAnnualReturnYear10 6.99% [6]
Class S2 Shares | ING SmallCap Opportunities Portfolio
  
Risk/Return: rr_RiskReturnAbstract  
Risk/Return [Heading] rr_RiskReturnHeading

ING SmallCap Opportunities Portfolio
Objective [Heading] rr_ObjectiveHeading

INVESTMENT OBJECTIVE
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock The Portfolio seeks long-term capital appreciation.
Expense [Heading] rr_ExpenseHeading

FEES AND EXPENSES OF THE PORTFOLIO
Expense Narrative [Text Block] rr_ExpenseNarrativeTextBlock The table describes the fees and expenses that you may pay if you buy and hold shares of the Portfolio. The table does not reflect fees or expenses that are, or may be, imposed under your variable annuity contracts or variable life insurance policies (“Variable Contract”) or a qualified pension or retirement plan (“Qualified Plan”). For more information on these charges, please refer to the documents governing your Variable Contract or consult your plan administrator.
Operating Expenses: rr_OperatingExpensesAbstract  
Operating Expenses Caption [Text] rr_OperatingExpensesCaption
Annual Portfolio Operating Expenses
Expenses you pay each year as a % of the value of your investment
Fee Waiver or Reimbursement over Assets, Date of Termination rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination May 1, 2013
Portfolio Turnover [Heading] rr_PortfolioTurnoverHeading
Portfolio Turnover % of average value of portfolio
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 transactions costs. These costs, which are not reflected in Annual Portfolio Operating Expenses or in the Expense Example, affect the Portfolio’s performance.

During the most recent fiscal year, the Portfolio’s portfolio turnover rate was 72% of the average value of its portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 72.00%
Expenses Not Correlated to Ratio Due to Acquired Fund Fees [Text] rr_ExpensesNotCorrelatedToRatioDueToAcquiredFundFees Total Annual Portfolio Operating Expenses may be higher than the Portfolio’s ratio of expenses to average net assets shown in the Portfolio’s Financial Highlights, which reflects the operating expenses of the Portfolio and does not include Acquired Fund Fees and Expenses.
Expense Example: rr_ExpenseExampleAbstract  
Expense Example [Heading] rr_ExpenseExampleHeading
Expense Example $
Expense Example Narrative [Text Block] rr_ExpenseExampleNarrativeTextBlock The Example is intended to help you compare the cost of investing in shares of the Portfolio with the costs of investing in other mutual funds. The Example does not reflect expenses and charges which are, or may be, imposed under your Variable Contract or Qualified Plan. The Example assumes that you invest $10,000 in the Portfolio for the time periods indicated. The Example also assumes that your investment had a 5% return each year and that the Portfolio’s operating expenses remain the same. Although your actual costs may be higher or lower, based on these assumptions your costs would be:
Expense Example Closing [Text Block] rr_ExpenseExampleClosingTextBlock The Example reflects applicable expense limitation agreements and/or waivers in effect, if any, for the one-year period and the first year of the three-, five-, and ten-year periods.
Strategy [Heading] rr_StrategyHeading

PRINCIPAL INVESTMENT STRATEGIES
Strategy Narrative [Text Block] rr_StrategyNarrativeTextBlock

Under normal market conditions, the Portfolio invests at least 80% of its net assets (plus borrowings for investment purposes) in common stock of smaller, lesser-known U.S. companies. The Portfolio will provide shareholders with at least 60 days’ prior notice of any change in this investment policy.

The Portfolio normally invests in companies that the sub-adviser (“Sub-Adviser”) believes have above average prospects for growth. For this Portfolio, smaller companies are those with market capitalizations that fall within the range of companies in the Russell 2000® Growth Index at the time of purchase. The Russell 2000® Growth Index is an index that measures the performance of small growth companies. Capitalization of companies in the Russell 2000® Growth Index will change with market conditions. The market capitalization of companies in the Russell 2000® Growth Index as of December 31, 2011, ranged from $23.4 million to $3.7 billion.

The Portfolio may invest in other investment companies, including exchange-traded funds, to the extent permitted under the Investment Company Act of 1940, as amended, and the rules, regulations, and exemptive orders thereunder (“1940 Act”).

The Sub-Adviser uses a disciplined combination of quantitative screens and bottom-up fundamental security analysis to build a broadly diversified portfolio of companies that the Sub-Adviser believes will have improving bottom lines, with reasonable valuation, and whose stocks demonstrate relative strength. The focus of company analysis is upon the prospects for continuing bottom-line growth, balance sheet strength, and cash flow characteristics. A proprietary measure is used to determine relative stock price strength. A determination of reasonable valuation for individual securities is based on the judgment of the Sub-Adviser.

The Sub-Adviser may sell securities for a variety of reasons, such as to secure gains, limit losses, or redeploy assets into opportunities believed to be more promising, among others.

The Portfolio may lend portfolio securities on a short-term or long-term basis, up to 33% of its total assets.
Risk [Heading] rr_RiskHeading

PRINCIPAL RISKS
Risk Narrative [Text Block] rr_RiskNarrativeTextBlock

You could lose money on an investment in the Portfolio. Any of the following risks, among others, could affect Portfolio performance or cause the Portfolio to lose money or to underperform market averages of other funds.

Company The price of a given company’s stock could decline or underperform for many reasons including, among others, poor management, financial problems, or business challenges. If a company declares bankruptcy or becomes insolvent, its stock could become worthless.

Investment Model The manager’s proprietary model may not adequately allow for existing or unforeseen market factors or the interplay between such factors.

Liquidity If a security is illiquid, the Portfolio might be unable to sell the security at a time when the Portfolio’s manager might wish to sell, and the security could have the effect of decreasing the overall level of the Portfolio’s liquidity. Further, the lack of an established secondary market may make it more difficult to value illiquid securities, which could vary from the amount the Portfolio could realize upon disposition. The Portfolio may make investments that become less liquid in response to market developments or adverse investor perception. The Portfolio could lose money if it cannot sell a security at the time and price that would be most beneficial to the Portfolio.

Market Stock prices may be volatile and are affected by the real or perceived impacts of such factors as economic conditions and political events. The stock market tends to be cyclical, with periods when stock prices generally rise and periods when stock prices generally decline. Any given stock market segment may remain out of favor with investors for a short or long period of time, and stocks as an asset class may underperform bonds or other asset classes during some periods. From time to time, the stock market may not favor the growth-oriented securities in which the Portfolio invests. Rather, the market could favor value-oriented securities or may not favor equities at all.

Other Investment Companies The main risk of investing in other investment companies, including exchange-traded funds, is the risk that the value of the securities underlying an investment company might decrease. Because the Portfolio may invest in other investment companies, you will pay a proportionate share of the expenses of that other investment company (including management fees, administration fees, and custodial fees) in addition to the expenses of the Portfolio.

Securities Lending Securities lending involves two primary risks: “investment risk” and “borrower default risk.” Investment risk is the risk that the Portfolio will lose money from the investment of the cash collateral received from the borrower. Borrower default risk is the risk that the Portfolio will lose money due to the failure of a borrower to return a borrowed security in a timely manner.

Small-Capitalization Company Investments in small-capitalization companies may involve greater risk than is customarily associated with larger, more established companies due to the greater business risks of small size, limited markets and financial resources, narrow product lines and the frequent lack of depth of management. The securities of smaller companies are often traded over-the-counter and may not be traded in volume typical on a national securities exchange.

An investment in the Portfolio is not a bank deposit and is not insured or guaranteed by the Federal Deposit Insurance Corporation, the Federal Reserve Board or any other government agency.

Risk Lose Money [Text] rr_RiskLoseMoney You could lose money on an investment in the Portfolio.
Risk Not Insured Depository Institution [Text] rr_RiskNotInsuredDepositoryInstitution An investment in the Portfolio is not a bank deposit and is not insured or guaranteed by the Federal Deposit Insurance Corporation, the Federal Reserve Board or any other government agency.
Bar Chart and Performance Table [Heading] rr_BarChartAndPerformanceTableHeading

PERFORMANCE INFORMATION
Performance Narrative [Text Block] rr_PerformanceNarrativeTextBlock The following information is intended to help you understand the risks of investing in the Portfolio. The following bar chart shows the changes in the Portfolio’s Class S2 shares’ and Class I shares’ performance from year to year, and the table compares the Portfolio’s Class S2 shares’ and Class I shares’ performance to the performance of a broad-based securities market index/indices for the same period. Class I shares’ performance has been adjusted to reflect the higher expenses of Class S2 shares. The Class S2 shares and Class I shares of the Portfolio would have substantially similar performance because they invest in the same portfolio of securities. However, Class I shares’ performance would be higher than Class S2 shares’ performance because of the higher expenses paid by Class S2 shares. The Portfolio’s performance information reflects applicable fee waivers and/or expense limitations in effect during the period presented. Absent such fee waivers/expense limitations, if any, performance would have been lower. Performance in the Average Annual Total Returns table does not include insurance-related charges imposed under a Variable Contract or expenses related to a Qualified Plan. If these charges or expenses were included, performance would be lower. Thus, you should not compare the Portfolio’s performance directly with the performance information of other investment products without taking into account all insurance-related charges and expenses payable under your Variable Contract or Qualified Plan. The Portfolio’s past performance is no guarantee of future results.
Performance Information Illustrates Variability of Returns [Text] rr_PerformanceInformationIllustratesVariabilityOfReturns The following bar chart shows the changes in the Portfolio’s Class S2 shares’ and Class I shares’ performance from year to year, and the table compares the Portfolio’s Class S2 shares’ and Class I shares’ performance to the performance of a broad-based securities market index/indices for the same period.
Performance Past Does Not Indicate Future [Text] rr_PerformancePastDoesNotIndicateFuture The Portfolio’s past performance is no guarantee of future results.
Bar Chart Table: rr_BarChartTableAbstract  
Bar Chart [Heading] rr_BarChartHeading
Calendar Year Total Returns
(for the periods ended December 31, 2011)
Bar Chart Narrative [Text Block] rr_BarChartNarrativeTextBlock The bar chart below shows the Portfolio’s adjusted Class I shares’ performance (2002-2009) and Class S2 shares’ performance (2010-2011).
Bar Chart Closing [Text Block] rr_BarChartClosingTextBlock Best quarter: 2nd, 2009, 22.71% and Worst quarter: 4th, 2008, (25.36)%
Average Annual Return: rr_AverageAnnualReturnAbstract  
Performance Table Heading rr_PerformanceTableHeading
Average Annual Total Returns%
(for the periods ended December 31, 2011)
Index No Deduction for Fees, Expenses, Taxes [Text] rr_IndexNoDeductionForFeesExpensesTaxes The index returns do not reflect deductions for fees, expenses, or taxes.
Class S2 Shares | ING SmallCap Opportunities Portfolio | Class S2
  
Operating Expenses: rr_OperatingExpensesAbstract  
Management Fee rr_ManagementFeesOverAssets 0.75%
Distribution and/or Shareholder Services (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.50%
Administrative Services Fee rr_Component1OtherExpensesOverAssets 0.10%
Other Expenses rr_OtherExpensesOverAssets 0.05%
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.01%
Total Annual Portfolio Operating Expenses rr_ExpensesOverAssets 1.41% [7]
Waivers and Reimbursements rr_FeeWaiverOrReimbursementOverAssets (0.10%) [17]
Total Annual Portfolio Operating Expenses After Waivers and Reimbursements rr_NetExpensesOverAssets 1.31%
Expense Example: rr_ExpenseExampleAbstract  
1 Yr rr_ExpenseExampleYear01 133
3 Yrs rr_ExpenseExampleYear03 436
5 Yrs rr_ExpenseExampleYear05 762
10 Yrs rr_ExpenseExampleYear10 1,682
Bar Chart Table: rr_BarChartTableAbstract  
2010 rr_AnnualReturn2010 31.83%
2011 rr_AnnualReturn2011 0.39%
Average Annual Return: rr_AverageAnnualReturnAbstract  
1 Yr rr_AverageAnnualReturnYear01 0.39%
5 Yrs rr_AverageAnnualReturnYear05   
10 Yrs rr_AverageAnnualReturnYear10   
Since Inception rr_AverageAnnualReturnSinceInception 29.93%
Inception Date rr_AverageAnnualReturnInceptionDate Feb. 27, 2009
Class S2 Shares | ING SmallCap Opportunities Portfolio | Class I
  
Bar Chart Table: rr_BarChartTableAbstract  
2002 rr_AnnualReturn2002 (43.88%)
2003 rr_AnnualReturn2003 38.19%
2004 rr_AnnualReturn2004 9.73%
2005 rr_AnnualReturn2005 8.69%
2006 rr_AnnualReturn2006 12.13%
2007 rr_AnnualReturn2007 9.64%
2008 rr_AnnualReturn2008 (34.76%)
2009 rr_AnnualReturn2009 30.53%
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel Best quarter:
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Jun. 30, 2009
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 22.71%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel Worst quarter:
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Dec. 31, 2008
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (25.36%)
Average Annual Return: rr_AverageAnnualReturnAbstract  
1 Yr rr_AverageAnnualReturnYear01 0.42% [2]
5 Yrs rr_AverageAnnualReturnYear05 4.32% [2]
10 Yrs rr_AverageAnnualReturnYear10 2.51% [2]
Inception Date rr_AverageAnnualReturnInceptionDate May 06, 1994 [2]
Class S2 Shares | ING SmallCap Opportunities Portfolio | Russell 2000 Growth Index | Class S2
  
Average Annual Return: rr_AverageAnnualReturnAbstract  
1 Yr rr_AverageAnnualReturnYear01 (2.91%) [6]
5 Yrs rr_AverageAnnualReturnYear05    [6]
10 Yrs rr_AverageAnnualReturnYear10    [6]
Since Inception rr_AverageAnnualReturnSinceInception 28.50% [4],[6]
Class S2 Shares | ING SmallCap Opportunities Portfolio | Russell 2000 Growth Index | Class I
  
Average Annual Return: rr_AverageAnnualReturnAbstract  
1 Yr rr_AverageAnnualReturnYear01 (2.91%) [6]
5 Yrs rr_AverageAnnualReturnYear05 2.09% [6]
10 Yrs rr_AverageAnnualReturnYear10 4.48% [6]
Class S2 Shares | ING SmallCap Opportunities Portfolio | Russell 2000 Index | Class S2
  
Average Annual Return: rr_AverageAnnualReturnAbstract  
1 Yr rr_AverageAnnualReturnYear01 (4.18%) [6]
5 Yrs rr_AverageAnnualReturnYear05    [6]
10 Yrs rr_AverageAnnualReturnYear10    [6]
Since Inception rr_AverageAnnualReturnSinceInception 27.26% [4],[6]
Class S2 Shares | ING SmallCap Opportunities Portfolio | Russell 2000 Index | Class I
  
Average Annual Return: rr_AverageAnnualReturnAbstract  
1 Yr rr_AverageAnnualReturnYear01 (4.18%) [6]
5 Yrs rr_AverageAnnualReturnYear05 0.15% [6]
10 Yrs rr_AverageAnnualReturnYear10 5.62% [6]
[1] The adviser is contractually obligated to limit expenses to 1.50% through May 1, 2013; the obligation does not extend to interest, taxes, brokerage commissions, extraordinary expenses, and Acquired Fund Fees and Expenses. The obligation will automatically renew for one-year terms unless it is terminated by the Portfolio or the adviser upon written notice within 90 days of the end of the then current term or upon termination of the advisory agreement and is subject to possible recoupment by the adviser within three years.
[2] (adjusted)
[3] The index returns include the reinvestment of dividends and distributions net of withholding taxes, but do not reflect fees, brokerage commissions, or other expenses.
[4] Reflects index performance since the date closest to the Class' inception for which data is available.
[5] The adviser is contractually obligated to limit expenses to 1.40% through May 1, 2013. The obligation will automatically renew for one-year terms unless it is terminated by the Portfolio or the adviser upon written notice within 90 days of the end of the then current term or upon termination of the advisory agreement and is subject to possible recoupment by the adviser within three years. In addition, the adviser is contractually obligated to further limit expenses to 1.35% through May 2, 2013. There is no guarantee this obligation will continue after May 2, 2013 and the obligation will continue only if the adviser elects to renew it. Any fees waived pursuant to this obligation shall be eligible for recoupment by the adviser within three years. These obligations do not extend to interest, taxes, brokerage commissions, extraordinary expenses, and Acquired Fund Fees and Expenses.
[6] The index returns do not reflect deductions for fees, expenses, or taxes.
[7] Total Annual Portfolio Operating Expenses may be higher than the Portfolio's ratio of expenses to average net assets shown in the Portfolio's Financial Highlights, which reflects the operating expenses of the Portfolio and does not include Acquired Fund Fees and Expenses.
[8] The adviser is contractually obligated to limit expenses to 1.42% through May 1, 2013; the obligation does not extend to interest, taxes, brokerage commissions, extraordinary expenses, and Acquired Fund Fees and Expenses. The obligation will automatically renew for one-year terms unless it is terminated by the Portfolio or the adviser upon written notice within 90 days of the end of the then current term or upon termination of the advisory agreement and is subject to possible recoupment by the adviser within three years.
[9] The adviser is contractually obligated to limit expenses to 1.00% through May 1, 2013; the obligation does not extend to interest, taxes, brokerage commissions, extraordinary expenses, and Acquired Fund Fees and Expenses. The obligation will automatically renew for one-year terms unless it is terminated by the Portfolio or the adviser upon written notice within 90 days of the end of the then current term or upon termination of the advisory agreement and is subject to possible recoupment by the adviser within three years.
[10] The adviser is contractually obligated to limit expenses to 0.90% through May 1, 2013. The obligation will automatically renew for one-year terms unless it is terminated by the Portfolio or the adviser upon written notice within 90 days of the end of the then current term or upon termination of the advisory agreement and is subject to possible recoupment by the adviser within three years. In addition, the adviser is contractually obligated to further limit expenses to 0.85% through May 2, 2013. There is no guarantee this obligation will continue after May 2, 2013 and the obligation will continue only if the adviser elects to renew it. Any fees waived pursuant to this obligation shall be eligible for recoupment. These obligations do not extend to interest, taxes, brokerage commissions, extraordinary expenses, and Acquired Fund Fees and Expenses.
[11] The adviser is contractually obligated to limit expenses to 0.92% through May 1, 2013; the obligation does not extend to interest, taxes, brokerage commissions, extraordinary expenses, and Acquired Fund Fees and Expenses. The obligation will automatically renew for one-year terms unless it is terminated by the Portfolio or the adviser upon written notice within 90 days of the end of the then current term or upon termination of the advisory agreement and is subject to possible recoupment by the adviser within three years.
[12] The adviser is contractually obligated to limit expenses to 1.20% through May 1, 2013; the obligation does not extend to interest, taxes, brokerage commissions, extraordinary expenses, and Acquired Fund Fees and Expenses. The obligation will automatically renew for one-year terms unless it is terminated by the Portfolio or the adviser upon written notice within 90 days of the end of the then current term or upon termination of the advisory agreement and is subject to possible recoupment by the adviser within three years. The distributor is also contractually obligated to waive 0.05% of the 0.25% shareholder services fee through May 1, 2013. There is no guarantee that the shareholder services fee waiver will continue after May 1, 2013. The shareholder services fee waiver will only renew if the distributor elects to renew it.
[13] The adviser is contractually obligated to limit expenses to 1.10% through May 1, 2013. The obligation will automatically renew for one-year terms unless it is terminated by the Portfolio or the adviser upon written notice within 90 days of the end of the then current term or upon termination of the advisory agreement and is subject to possible recoupment by the adviser within three years. In addition, the adviser is contractually obligated to further limit expenses to 1.10% through May 2, 2013. There is no guarantee this obligation will continue after May 2, 2013 and the obligation will continue only if the adviser elects to renew it. Any fees waived pursuant to this obligation shall be eligible for recoupment. These obligations do not extend to interest, taxes, brokerage commissions, extraordinary expenses, and Acquired Fund Fees and Expenses.
[14] The adviser is contractually obligated to limit expenses to 1.17% through May 1, 2013; the obligation does not extend to interest, taxes, brokerage commissions, extraordinary expenses, and Acquired Fund Fees and Expenses. The obligation will automatically renew for one-year terms unless it is terminated by the Portfolio or the adviser upon written notice within 90 days of the end of the then current term or upon termination of the advisory agreement and is subject to possible recoupment by the adviser within three years.
[15] The adviser is contractually obligated to limit expenses to 1.40% through May 1, 2013; the obligation does not extend to interest, taxes, brokerage commissions, extraordinary expenses, and Acquired Fund Fees and Expenses. The obligation will automatically renew for one-year terms unless it is terminated by the Portfolio or the adviser upon written notice within 90 days of the end of the then current term or upon termination of the advisory agreement and is subject to possible recoupment by the adviser within three years. The distributor is also contractually obligated to waive 0.10% of the 0.25% distribution fee through May 1, 2013. There is no guarantee that the distribution fee waiver will continue after May 1, 2013. The distribution fee waiver will only renew if the distributor elects to renew it.
[16] The adviser is contractually obligated to limit expenses to 1.30% through May 1, 2013. The obligation will automatically renew for one-year terms unless it is terminated by the Portfolio or the adviser upon written notice within 90 days of the end of the then current term or upon termination of the advisory agreement and is subject to possible recoupment by the adviser within three years. In addition, the adviser is contractually obligated to further limit expenses to 1.25% through May 2, 2013. There is no guarantee this obligation will continue after May 2, 2013 and the obligation will continue only if the adviser elects to renew it. Any fees waived pursuant to this obligation shall be eligible for recoupment. These obligations do not extend to interest, taxes, brokerage commissions, extraordinary expenses, and Acquired Fund Fees and Expenses. The distributor is also contractually obligated to waive 0.10% of the 0.25% distribution fee through May 1, 2013. There is no guarantee the distribution fee waiver will continue after May 1, 2013. The distribution fee waiver will continue only if the distributor elects to renew it.
[17] The adviser is contractually obligated to limit expenses to 1.32% through May 1, 2013; the obligation does not extend to interest, taxes, brokerage commissions, extraordinary expenses, and Acquired Fund Fees and Expenses. The obligation will automatically renew for one-year terms unless it is terminated by the Portfolio or the adviser upon written notice within 90 days of the end of the then current term or upon termination of the advisory agreement and is subject to possible recoupment by the adviser within three years. The distributor is also contractually obligated to waive 0.10% of the 0.25% distribution fee through May 1, 2013.There is no guarantee the distribution fee waiver will continue after May 1, 2013. The distribution fee waiver will only renew if the distributor elects to renew it.