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Risk/Return: rr_RiskReturnAbstract  
Risk/Return [Heading] rr_RiskReturnHeading Advantage Portfolio
Objective [Heading] rr_ObjectiveHeading Objective
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock

The Advantage Portfolio seeks long-term capital appreciation.

Expense [Heading] rr_ExpenseHeading Fees and Expenses
Expense Narrative [Text Block] rr_ExpenseNarrativeTextBlock

The table below describes the fees and expenses that you may pay if you buy and hold shares of the Portfolio. For shareholders of Class P and Class H shares, you may qualify for sales charge discounts if the cumulative net asset value ("NAV") of Class P or Class H shares of the Portfolio purchased in a single transaction, together with the NAV of all Class P or Class H shares of portfolios of Morgan Stanley Institutional Fund, Inc. (the "Fund") or portfolios of Morgan Stanley Institutional Fund Trust held in related accounts, amounts to $25,000 or more with respect to Class P and $50,000 or more with respect to Class H. More information about these and other discounts is available from your financial adviser and in the "Shareholder Information—How To Purchase Class P and Class H Shares" section on page 25 of this Prospectus.

Shareholder Fees Caption [Text] rr_ShareholderFeesCaption Shareholder Fees (fees paid directly from your investment)
Operating Expenses Caption [Text] rr_OperatingExpensesCaption Annual Portfolio Operating Expenses (expenses that you pay each year as a percentage of the value of your investment)
Portfolio Turnover [Heading] rr_PortfolioTurnoverHeading Portfolio Turnover
Portfolio Turnover [Text Block] rr_PortfolioTurnoverTextBlock

The Portfolio pays transaction costs, such as commissions, when it buys and sells securities (or "turns over" its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when Portfolio shares are held in a taxable account. These costs, which are not reflected in Total Annual Portfolio Operating Expenses or in the Example, affect Portfolio performance. During the most recent fiscal year, the Portfolio's portfolio turnover rate was 50% of the average value of its portfolio.

Portfolio Turnover, Rate rr_PortfolioTurnoverRate 50.00%
Expense Example [Heading] rr_ExpenseExampleHeading Example
Expense Example Narrative [Text Block] rr_ExpenseExampleNarrativeTextBlock

The example below is intended to help you compare the cost of investing in the Portfolio with the cost of investing in other mutual funds.


The example below assumes that you invest $10,000 in the Portfolio, your investment has 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:

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

Under normal market conditions, the Adviser seeks to achieve the Portfolio's investment objective by investing primarily in established companies with capitalizations within the range of companies included in the Russell 1000® Growth Index.


The Adviser emphasizes a bottom-up stock selection process, seeking attractive investments on an individual company basis. In selecting securities for investment, the Adviser seeks to invest in franchises with strong name recognition and sustainable competitive advantages. The Adviser typically favors companies with rising returns on invested capital, above average business visibility, strong free cash flow generation and an attractive risk/reward. The Adviser generally considers selling a portfolio holding when it determines that the holding no longer satisfies its investment criteria.


The Portfolio may invest in foreign securities, which may include emerging market securities. The Portfolio's equity investments may include common and preferred stocks, convertible securities and equity-linked securities, rights and warrants to purchase common stocks, depositary receipts, exchange-traded funds ("ETFs"), limited partnership interests and other specialty securities having equity features. The Portfolio may invest in privately placed and restricted securities.


The Portfolio may utilize foreign currency forward exchange contracts, which are derivatives, in connection with its investments in foreign securities.

Risk [Heading] rr_RiskHeading Principal Risks
Risk Narrative [Text Block] rr_RiskNarrativeTextBlock

There is no assurance that the Portfolio will achieve its investment objective and you can lose money investing in this Portfolio. The principal risks of investing in the Portfolio include:


•  Equity Securities. In general, prices of equity securities are more volatile than those of fixed income securities. The prices of equity securities fluctuate, and sometimes widely fluctuate, in response to activities specific to the issuer of the security as well as factors unrelated to the fundamental condition of the issuer, including general market, economic and political conditions. To the extent that the Portfolio invests in convertible securities, and the convertible security's investment value is greater than its conversion value, its price will be likely to increase when interest rates fall and decrease when interest rates rise. If the conversion value exceeds the investment value, the price of the convertible security will tend to fluctuate directly with the price of the underlying equity security.


•  Foreign and Emerging Market Securities. Investments in foreign markets entail special risks such as currency, political, economic and market risks. There also may be greater market volatility, less reliable financial information, higher transaction and custody costs, decreased market liquidity and less government and exchange regulation associated with investments in foreign markets. In addition, investments in certain foreign markets, which have historically been considered stable, may become more volatile and subject to increased risk due to ongoing developments and changing conditions in such markets. Moreover, the growing interconnectivity of global economies and financial markets has increased the probability that adverse developments and conditions in one country or region will affect the stability of economies and financial markets in other countries or regions. The risks of investing in emerging market countries are greater than risks associated with investments in foreign developed countries. In addition, the Portfolio's investments may be denominated in foreign currencies and therefore, to the extent unhedged, the value of the investment will fluctuate with the U.S. dollar exchange rates. To the extent hedged by use of foreign currency forward exchange contracts, the precise matching of foreign currency forward exchange contract amounts and the value of the securities involved will not generally be possible because the future value of such securities in foreign currencies will change as a consequence of market movements in the value of those securities between the date on which the contract is entered into and the date it matures. There is additional risk that such transactions reduce or preclude the opportunity for gain if the value of the currency should move in the direction opposite to the position taken and that foreign currency forward exchange contracts create exposure to currencies in which the Portfolio's securities are not denominated. The use of foreign currency forward exchange contracts involves the risk of loss from the insolvency or bankruptcy of the counterparty to the contract or the failure of the counterparty to make payments or otherwise comply with the terms of the contract.


•  Privately Placed and Restricted Securities. The Portfolio's investments may also include privately placed securities, which are subject to resale restrictions. These securities will have the effect of increasing the level of Portfolio illiquidity to the extent the Portfolio may be unable to sell or transfer these securities due to restrictions on transfers or on the ability to find buyers interested in purchasing the securities. The illiquidity of the market, as well as the lack of publicly available information regarding these securities, may also adversely affect the ability to arrive at a fair value for certain securities at certain times and could make it difficult for the Portfolio to sell certain securities.


Shares of the Portfolio are not bank deposits and are not guaranteed or insured by the Federal Deposit Insurance Corporation or any other government agency.

Risk Lose Money [Text] rr_RiskLoseMoney There is no assurance that the Portfolio will achieve its investment objective and you can lose money investing in this Portfolio.
Risk Not Insured Depository Institution [Text] rr_RiskNotInsuredDepositoryInstitution Shares of the Portfolio are not bank deposits and are not guaranteed or insured by the Federal Deposit Insurance Corporation or any other government agency.
Bar Chart and Performance Table [Heading] rr_BarChartAndPerformanceTableHeading Performance Information
Performance Narrative [Text Block] rr_PerformanceNarrativeTextBlock

Pursuant to an agreement and plan of reorganization between the Fund, on behalf of the Portfolio, and Van Kampen Equity Trust II, on behalf of the Van Kampen Core Growth Fund (the "Predecessor Fund"), on May 21, 2010 the Portfolio acquired substantially all of the assets and substantially all of the liabilities of the Predecessor Fund in exchange for Class I, Class H and Class L shares of the Portfolio (the "Reorganization"). Pursuant to the Reorganization, Class A and Class B shareholders of the Predecessor Fund received Class H shares of the Portfolio, and Class C and Class I shareholders of the Predecessor Fund received Class L and Class I shares, respectively, of the Portfolio. As a result of the Reorganization, the Portfolio is the accounting successor of the Predecessor Fund. The historical performance information shown below reflects, for the period prior to the Reorganization, the historical performance of the Class A, Class C and Class I shares of the Predecessor Fund.


The bar chart and table below provide some indication of the risks of investing in the Portfolio by showing changes in the Portfolio's Class I shares'* performance from year-to-year and by showing how the Portfolio's average annual returns for the past one year period and since inception compare with those of a broad measure of market performance, as well as an index that represents a group of similar mutual funds, over time. The performance of the other Classes, which is shown in the table below, will differ because the Classes have different ongoing fees. The Portfolio's returns in the table include the maximum applicable sales charge for Class P and Class H and assume you sold your shares at the end of each period (unless otherwise noted). The Portfolio's past performance, before and after taxes, is not necessarily an indication of how the Portfolio will perform in the future. Updated performance information is available online at www.morganstanley.com/im.

Performance Information Illustrates Variability of Returns [Text] rr_PerformanceInformationIllustratesVariabilityOfReturns The bar chart and table below provide some indication of the risks of investing in the Portfolio by showing changes in the Portfolio's Class I shares' performance from year-to-year and by showing how the Portfolio's average annual returns for the past one year period and since inception compare with those of a broad measure of market performance, as well as an index that represents a group of similar mutual funds, over time.
Performance Availability Website Address [Text] rr_PerformanceAvailabilityWebSiteAddress www.morganstanley.com/im
Performance Past Does Not Indicate Future [Text] rr_PerformancePastDoesNotIndicateFuture The Portfolio's past performance, before and after taxes, is not necessarily an indication of how the Portfolio will perform in the future.
Bar Chart [Heading] rr_BarChartHeading Annual Total Returns*-Calendar Years
Bar Chart Footnotes [Text Block] rr_BarChartFootnotesTextBlock

*Performance shown for the Portfolio's Class I shares reflects the performance of the Class I shares of the Predecessor Fund for periods prior to May 21, 2010.

Bar Chart Closing [Text Block] rr_BarChartClosingTextBlock

High Quarter

 

9/30/09

   

21.12

%

 

Low Quarter

 

9/30/11

   

–9.27

%

 
Bar Chart, Returns for Class Not Offered in Prospectus [Text] rr_BarChartReturnsForClassNotOfferedInProspectus Performance shown for the Portfolio's Class I shares reflects the performance of the Class I shares of the Predecessor Fund for periods prior to May 21, 2010.
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel High Quarter
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Sep. 30, 2009
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 21.12%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel Low Quarter
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Sep. 30, 2011
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (9.27%)
Performance Table Does Reflect Sales Loads rr_PerformanceTableDoesReflectSalesLoads The Portfolio's returns in the table include the maximum applicable sales charge for Class P and Class H and assume you sold your shares at the end of each period (unless otherwise noted).
Index No Deduction for Fees, Expenses, Taxes [Text] rr_IndexNoDeductionForFeesExpensesTaxes (reflects no deduction for fees, expenses or taxes)
Performance Table Uses Highest Federal Rate rr_PerformanceTableUsesHighestFederalRate The after-tax returns shown in the table above are calculated using the historical highest individual federal marginal income tax rates during the period shown and do not reflect the impact of state and local taxes.
Performance Table Not Relevant to Tax Deferred rr_PerformanceTableNotRelevantToTaxDeferred Actual after-tax returns depend on the investor's tax situation and may differ from those shown, and after-tax returns are not relevant to investors who hold their Portfolio shares through tax deferred arrangements such as 401(k) plans or individual retirement accounts.
Performance Table One Class of after Tax Shown [Text] rr_PerformanceTableOneClassOfAfterTaxShown After-tax returns for the Portfolio's other Classes will vary from Class I shares' returns.
Performance Table Explanation after Tax Higher rr_PerformanceTableExplanationAfterTaxHigher After-tax returns may be higher than before-tax returns due to an assumed benefit from capital losses that would have been realized had Portfolio shares been sold at the end of the relevant periods, as applicable.
Performance Table Closing [Text Block] rr_PerformanceTableClosingTextBlock

The after-tax returns shown in the table above are calculated using the historical highest individual federal marginal income tax rates during the period shown and do not reflect the impact of state and local taxes. After-tax returns for the Portfolio's other Classes will vary from Class I shares' returns. Actual after-tax returns depend on the investor's tax situation and may differ from those shown, and after-tax returns are not relevant to investors who hold their Portfolio shares through tax deferred arrangements such as 401(k) plans or individual retirement accounts. After-tax returns may be higher than before-tax returns due to an assumed benefit from capital losses that would have been realized had Portfolio shares been sold at the end of the relevant periods, as applicable.

Caption rr_AverageAnnualReturnCaption Average Annual Total Returns (for the calendar periods ended December 31, 2012)
Russell 1000® Growth Index (reflects no deduction for fees, expenses or taxes)
  
Risk/Return: rr_RiskReturnAbstract  
Average Annual Returns, Past One Year rr_AverageAnnualReturnYear01 15.26% [1]
Average Annual Returns, Since Inception rr_AverageAnnualReturnSinceInception 5.68% [1]
Average Annual Returns, Inception Date rr_AverageAnnualReturnInceptionDate Jun. 30, 2008 [1]
Lipper Large-Cap Growth Funds Index (reflects no deduction for fees, expenses or taxes)
  
Risk/Return: rr_RiskReturnAbstract  
Average Annual Returns, Past One Year rr_AverageAnnualReturnYear01 15.92% [2]
Average Annual Returns, Since Inception rr_AverageAnnualReturnSinceInception 3.60% [2]
Average Annual Returns, Inception Date rr_AverageAnnualReturnInceptionDate Jun. 30, 2008 [2]
Russell 1000® Growth Index Class P Comparison (reflects no deduction for fees, expenses or taxes
  
Risk/Return: rr_RiskReturnAbstract  
Average Annual Returns, Past One Year rr_AverageAnnualReturnYear01 15.26% [1]
Average Annual Returns, Since Inception rr_AverageAnnualReturnSinceInception 14.27% [1]
Average Annual Returns, Inception Date rr_AverageAnnualReturnInceptionDate May 21, 2010 [1]
Lipper Large-Cap Growth Funds Index Class P Comparison (reflects no deduction for taxes)
  
Risk/Return: rr_RiskReturnAbstract  
Average Annual Returns, Past One Year rr_AverageAnnualReturnYear01 15.92% [2]
Average Annual Returns, Since Inception rr_AverageAnnualReturnSinceInception 12.17% [2]
Average Annual Returns, Inception Date rr_AverageAnnualReturnInceptionDate May 21, 2010 [2]
Class H
  
Risk/Return: rr_RiskReturnAbstract  
Maximum sales charge (load) imposed on purchases (as a percentage of offering price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice 4.75%
Advisory Fee rr_ManagementFeesOverAssets 0.75%
Distribution and/or Shareholder Service (12b-1) Fee rr_DistributionAndService12b1FeesOverAssets 0.25%
Other Expenses rr_OtherExpensesOverAssets 1.59%
Total Annual Portfolio Operating Expenses rr_ExpensesOverAssets 2.59% [3]
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (1.29%) [3]
Total Annual Portfolio Operating Expenses After Fee Waiver and/or Expense Reimbursement rr_NetExpensesOverAssets 1.30% [3]
Expense Breakpoint Discounts [Text] rr_ExpenseBreakpointDiscounts For shareholders of Class P and Class H shares, you may qualify for sales charge discounts if the cumulative net asset value ("NAV") of Class P or Class H shares of the Portfolio purchased in a single transaction, together with the NAV of all Class P or Class H shares of portfolios of Morgan Stanley Institutional Fund, Inc. (the "Fund") or portfolios of Morgan Stanley Institutional Fund Trust held in related accounts, amounts to $25,000 or more with respect to Class P and $50,000 or more with respect to Class H.
Expense Breakpoint, Minimum Investment Required [Amount] rr_ExpenseBreakpointMinimumInvestmentRequiredAmount 50,000
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 601
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 868
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 1,154
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 1,968
Average Annual Returns, Past One Year rr_AverageAnnualReturnYear01 10.53% [4]
Average Annual Returns, Since Inception rr_AverageAnnualReturnSinceInception 5.81% [4]
Average Annual Returns, Inception Date rr_AverageAnnualReturnInceptionDate Jun. 30, 2008 [4]
Class I
  
Risk/Return: rr_RiskReturnAbstract  
Maximum sales charge (load) imposed on purchases (as a percentage of offering price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Advisory Fee rr_ManagementFeesOverAssets 0.75%
Distribution and/or Shareholder Service (12b-1) Fee rr_DistributionAndService12b1FeesOverAssets none
Other Expenses rr_OtherExpensesOverAssets 1.59%
Total Annual Portfolio Operating Expenses rr_ExpensesOverAssets 2.34% [3]
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (1.29%) [3]
Total Annual Portfolio Operating Expenses After Fee Waiver and/or Expense Reimbursement rr_NetExpensesOverAssets 1.05% [3]
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 107
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 334
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 579
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 1,283
Annual Return 2009 rr_AnnualReturn2009 49.30%
Annual Return 2010 rr_AnnualReturn2010 20.23%
Annual Return 2011 rr_AnnualReturn2011 5.33%
Annual Return 2012 rr_AnnualReturn2012 16.38%
Average Annual Returns, Past One Year rr_AverageAnnualReturnYear01 16.38% [4]
Average Annual Returns, Since Inception rr_AverageAnnualReturnSinceInception 7.21% [4]
Average Annual Returns, Inception Date rr_AverageAnnualReturnInceptionDate Jun. 30, 2008 [4]
Class I | After Taxes on Distributions
  
Risk/Return: rr_RiskReturnAbstract  
Average Annual Returns, Past One Year rr_AverageAnnualReturnYear01 15.27% [4]
Average Annual Returns, Since Inception rr_AverageAnnualReturnSinceInception 6.78% [4]
Class I | After Taxes on Distributions and Sale of Portfolio Shares
  
Risk/Return: rr_RiskReturnAbstract  
Average Annual Returns, Past One Year rr_AverageAnnualReturnYear01 12.13% [4]
Average Annual Returns, Since Inception rr_AverageAnnualReturnSinceInception 6.12% [4]
Class L
  
Risk/Return: rr_RiskReturnAbstract  
Maximum sales charge (load) imposed on purchases (as a percentage of offering price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Advisory Fee rr_ManagementFeesOverAssets 0.75%
Distribution and/or Shareholder Service (12b-1) Fee rr_DistributionAndService12b1FeesOverAssets 0.75%
Other Expenses rr_OtherExpensesOverAssets 1.59%
Total Annual Portfolio Operating Expenses rr_ExpensesOverAssets 3.09% [3]
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (2.00%) [3]
Total Annual Portfolio Operating Expenses After Fee Waiver and/or Expense Reimbursement rr_NetExpensesOverAssets 1.09% [3]
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 111
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 347
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 601
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 1,329
Average Annual Returns, Past One Year rr_AverageAnnualReturnYear01 16.42% [4]
Average Annual Returns, Since Inception rr_AverageAnnualReturnSinceInception 7.06% [4]
Average Annual Returns, Inception Date rr_AverageAnnualReturnInceptionDate Jun. 30, 2008 [4]
Class P
  
Risk/Return: rr_RiskReturnAbstract  
Maximum sales charge (load) imposed on purchases (as a percentage of offering price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice 5.25%
Advisory Fee rr_ManagementFeesOverAssets 0.75%
Distribution and/or Shareholder Service (12b-1) Fee rr_DistributionAndService12b1FeesOverAssets 0.25%
Other Expenses rr_OtherExpensesOverAssets 1.59%
Total Annual Portfolio Operating Expenses rr_ExpensesOverAssets 2.59% [3]
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (1.29%) [3]
Total Annual Portfolio Operating Expenses After Fee Waiver and/or Expense Reimbursement rr_NetExpensesOverAssets 1.30% [3]
Expense Breakpoint Discounts [Text] rr_ExpenseBreakpointDiscounts For shareholders of Class P and Class H shares, you may qualify for sales charge discounts if the cumulative net asset value ("NAV") of Class P or Class H shares of the Portfolio purchased in a single transaction, together with the NAV of all Class P or Class H shares of portfolios of Morgan Stanley Institutional Fund, Inc. (the "Fund") or portfolios of Morgan Stanley Institutional Fund Trust held in related accounts, amounts to $25,000 or more with respect to Class P and $50,000 or more with respect to Class H.
Expense Breakpoint, Minimum Investment Required [Amount] rr_ExpenseBreakpointMinimumInvestmentRequiredAmount 25,000
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 650
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 915
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 1,200
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 2,010
Average Annual Returns, Past One Year rr_AverageAnnualReturnYear01 10.02% [5]
Average Annual Returns, Since Inception rr_AverageAnnualReturnSinceInception 13.70% [5]
Average Annual Returns, Inception Date rr_AverageAnnualReturnInceptionDate May 21, 2010 [5]
[1] The Russell 1000 Growth Index measures the performance of the large-cap growth segment of the U.S. equity universe. It includes those Russell 1000 Index companies with higher price-to-book ratios and higher forecasted growth values. The Russell 1000 Index is an index of approximately 1,000 of the largest U.S. companies based on a combination of market capitalization and current index membership. It is not possible to invest directly in an index.
[2] The Lipper Large-Cap Growth Funds Index is an equally weighted performance index of the largest qualifying funds (based on net assets) in the Lipper Large-Cap Growth Funds classification. There are currently 30 funds represented in this Index.
[3] The Portfolio's "Adviser," Morgan Stanley Investment Management Inc., has agreed to reduce its advisory fee and/or reimburse the Portfolio so that Total Annual Portfolio Operating Expenses, excluding certain investment related expenses, taxes, interest and other extraordinary expenses (including litigation), will not exceed 1.05% for Class I, 1.30% for Class P, 1.30% for Class H and 1.09% for Class L. The fee waivers and/or expense reimbursements will continue for at least one year or until such time as the Fund's Board of Directors acts to discontinue all or a portion of such waivers and/or reimbursements when it deems such action is appropriate. The Portfolio's "Distributor," Morgan Stanley Distribution, Inc., has agreed to waive for at least one year the 12b-1 fee on Class L shares of the Portfolio to the extent it exceeds 0.04% of the average daily net assets of such shares on an annualized basis.
[4] Performance shown for the Portfolio's Class I, Class H and Class L shares reflects the performance of the Class I, Class A and Class C shares, respectively, of the Predecessor Fund for periods prior to May 21, 2010.
[5] The historical performance of Class P shares has been restated to reflect the current maximum initial sales charge of 5.25%.