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Old Westbury All Cap Core Fund  
Risk/Return: rr_RiskReturnAbstract  
Risk/Return [Heading] rr_RiskReturnHeading Old Westbury All Cap Core Fund
Objective [Heading] rr_ObjectiveHeading Investment Goal
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock

The Fund’s goal is to seek long-term capital appreciation.
Expense [Heading] rr_ExpenseHeading Fees and Expenses
Expense Narrative [Text Block] rr_ExpenseNarrativeTextBlock

This table describes the fees and expenses that you may pay if you buy and hold shares of the Fund.
Operating Expenses Caption [Text] rr_OperatingExpensesCaption Annual Fund 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 Fund 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 and may result in higher taxes when Fund shares are held in a taxable account. These costs, which are not reflected in Annual Fund Operating Expenses or in the Example, affect the Fund’s performance. During the fiscal year ended October 31, 2016, the Fund’s portfolio turnover rate was 34% of the average value of its portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 34.00%
Expenses Restated to Reflect Current [Text] rr_ExpensesRestatedToReflectCurrent The Management Fee has been restated to reflect the increase in the management fee effective December 30, 2016.
Expenses Not Correlated to Ratio Due to Acquired Fund Fees [Text] rr_ExpensesNotCorrelatedToRatioDueToAcquiredFundFees Total Annual Fund Operating Expenses will not agree with the ratio of expenses to average net assets before expense waivers in the Fund’s Financial Highlights, as the Financial Highlights reflect actual direct operating expenses of the Fund and do not include Acquired Fund Fees and Expenses.
Expense Example [Heading] rr_ExpenseExampleHeading Example
Expense Example Narrative [Text Block] rr_ExpenseExampleNarrativeTextBlock

This Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. The Example assumes that you invest $10,000 in the Fund for the time periods indicated below and then redeem all of your shares at the end of these periods. The Example also assumes that your investment has a 5% return each year and that the Fund’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

The Fund pursues its investment goal by investing in a diversified portfolio of equity and equity-related securities of any market capitalization. The Fund has no restrictions as to the size of the companies in which it invests. The Fund may invest in what generally are considered small-cap stocks, mid-cap stocks and large-cap stocks. The Fund may focus its investments in one of those categories, two of them or all of them, and may change the allocation of its investments at any time.


The Fund invests in a portfolio of securities the Adviser believes has the potential for long-term capital appreciation. The Fund invests primarily in securities listed on securities exchanges or actively traded in over-the-counter markets. The securities may be listed or traded in the form of American Depositary Receipts (“ADRs”), Global Depositary Receipts (“GDRs”), or other types of depositary receipts (including non-voting depositary receipts) or dual listed securities. The foreign securities in which the Fund may invest may be issued by issuers located in emerging market or developing market countries. The Fund also may invest in exchange-traded funds (“ETFs”) and a variety of derivatives, including futures, options and other derivative instruments, to increase or to hedge, or protect, its exposure to, for example, movements in the securities markets.
Risk [Heading] rr_RiskHeading Principal Risks
Risk Narrative [Text Block] rr_RiskNarrativeTextBlock

All investments carry a certain amount of risk and there is no assurance that the Fund will achieve its investment goal. The Adviser uses the Fund’s principal investment strategies and other investment strategies to seek to achieve the Fund’s investment goal. Investment decisions made by the Adviser in using these strategies may not produce the returns expected by the Adviser, may cause the Fund’s shares to lose value or may cause the Fund to underperform other funds with a similar investment goal. The shares offered by this Prospectus are not deposits or obligations of any bank, are not endorsed or guaranteed by any bank and are not insured or guaranteed by the U.S. Government, the Federal Deposit Insurance Corporation, the Federal Reserve Board or any other government agency. You could lose all or a part of your investment in the Fund.


The following are the principal risks of investing in the Fund. Please see “Additional Information About the Funds” for a detailed discussion of these risks and other factors you should carefully consider before deciding to invest in the Fund.


Stock Market/Company Risk —Stock markets are volatile and can decline significantly in response to issuer, industry, market, economic, political, regulatory, geopolitical, and other conditions. The value of an equity security can decline significantly in response to these conditions.


Market Capitalization Risk —To the extent the Fund invests in securities of small-, mid-, or large-cap companies, it takes on the associated risks. At times, any one of these market capitalizations may be out of favor with investors. Compared to small- and mid-cap companies, large-cap companies may be less responsive to changes and opportunities. Compared to large-cap companies, small- and mid-cap companies may depend on a more limited management group, may have a shorter history of operations, and may have limited product lines, markets or financial resources. The securities of small- and mid-cap companies are often more volatile and less liquid than the securities of larger companies and may be more affected than other types of securities by the underperformance of a sector or during market downturns.


Foreign Market Risk — Exposure to foreign markets through issuers or currencies can involve additional risks relating to market, economic, political, regulatory, geopolitical, or other conditions. In addition, the securities of foreign companies also may be subject to the imposition of economic sanctions or other government restrictions. The risks of foreign investments are increased in emerging markets which may experience hyperinflation and have far lower trading volumes and less liquidity than developed markets. Changes in foreign currency exchange rates can affect the value of the Fund’s portfolio. Depositary receipts are generally subject to the same risks as the foreign securities that they evidence or into which they may be converted.


Developing Market Countries Risk — The Fund’s investments in developing market countries are subject to all of the risks of foreign investing generally, and have additional heightened risks due to a lack of established legal, political, business and social frameworks to support securities markets.


Exchange-Traded Funds Risk — Exchange-traded funds or ETFs are subject to many of the same risks associated with individual stocks, including market risk where the market as a whole, or the specific sector in which an ETF invests, may decline.


U.S. Government Obligations Risk — U.S. Government securities that are not direct obligations of the U.S. Treasury have more credit risk than securities directly supported by the full faith and credit of the U.S. Government.


Fixed Income Securities Risk — Fixed income securities are subject to a number of risks, including interest rate risk, credit risk, and the risks associated with a lack of liquidity in the fixed income market. In addition, the value of fixed income securities is subject to volatility and losses resulting from changes or perceived changes in economic conditions, particularly during times of unusual or adverse market or political events. Certain types of fixed income securities may be more sensitive to such conditions.


Credit Risk — Credit risk refers to the possibility that the issuer of a security will not be able to make payments of interest and principal when due. Changes in an issuer’s credit rating or the market’s perception of an issuer’s creditworthiness may also affect the value of the Fund’s investment in that issuer.


Interest Rate Risk — Interest rate risk is the risk of losses attributable to changes in interest rates. In general, when interest rates rise, debt security prices tend to fall. The opposite is also generally true: debt security prices tend to rise when interest rates fall. In general, securities with longer maturities are more sensitive to these interest rate changes.


Derivatives Risk — Derivatives are subject to a number of risks, including changes in the market price of the underlying securities, credit risk with respect to the counterparty to the derivative instruments and the risk of loss due to changes in interest rates. The use of certain derivatives may also have a leveraging effect, which may increase the Fund’s sensitivity to adverse market movements and may exaggerate a loss.
Risk Lose Money [Text] rr_RiskLoseMoney You could lose all or a part of your investment in the Fund.
Risk Not Insured Depository Institution [Text] rr_RiskNotInsuredDepositoryInstitution The shares offered by this Prospectus are not deposits or obligations of any bank, are not endorsed or guaranteed by any bank and are not insured or guaranteed by the U.S. Government, 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 bar chart and the performance table shown below provide some indication of the risks of investing in the Fund by showing changes in its performance from year to year and by comparing the Fund’s performance to a broad-based securities index, the MSCI ACWI Large Cap Index (Net) (the Fund’s prior index). On December 30, 2016, the Fund changed its primary benchmark from the MSCI ACWI Large Cap Index (Net) to the MSCI ACWI Investable Market Index (Net) to reflect the Fund’s current strategy and its ability to invest across the entire capitalization range of equity securities throughout the world. In addition, on March 1, 2017, the Fund also compares its performance to a blended benchmark, as a secondary benchmark, consisting of a 90% weighting in the MSCI USA Index (Gross) and a 10% weighting in the MSCI ACWI ex USA Index (Net). The Net version of each index reflects no deductions for fees, expenses or income taxes. Past performance (before and after taxes) does not necessarily predict future performance. Fund performance reflects fees, waivers and/or expense reimbursements and reinvestment of distributions, if any. Without waivers/reimbursements, performance would be lower.


Prior to December 30, 2016, the Fund was named the Old Westbury Large Cap Core Fund and operated under a different investment strategy. Prior to November 16, 2011, the Fund was named the Old Westbury U.S. Large Cap Fund and operated under a different investment strategy of investing at least 80% of its net assets, including any borrowings for investment purposes, in equity securities of U.S. large capitalization companies. Prior to October 2, 2008, the Fund was named the Old Westbury Large Cap Equity Fund and operated under a different investment strategy. The performance information shown below largely represents the Fund’s prior investment strategies and may not be representative of performance the Fund will achieve under its current investment strategy.
Performance Information Illustrates Variability of Returns [Text] rr_PerformanceInformationIllustratesVariabilityOfReturns The bar chart and the performance table shown below provide some indication of the risks of investing in the Fund by showing changes in its performance from year to year and by comparing the Fund’s performance to a broad-based securities index, the MSCI ACWI Large Cap Index (Net) (the Fund’s prior index).
Performance Additional Market Index [Text] rr_PerformanceAdditionalMarketIndex In addition, on March 1, 2017, the Fund also compares its performance to a blended benchmark, as a secondary benchmark, consisting of a 90% weighting in the MSCI USA Index (Gross) and a 10% weighting in the MSCI ACWI ex USA Index (Net).
Performance Past Does Not Indicate Future [Text] rr_PerformancePastDoesNotIndicateFuture Past performance (before and after taxes) does not necessarily predict future performance.
Bar Chart [Heading] rr_BarChartHeading Annual Total Returns (for calendar years ended December 31st)
Bar Chart Closing [Text Block] rr_BarChartClosingTextBlock

During the periods shown in the bar chart, the highest return for a quarter was 13.19% (quarter ended 6/30/2009) and the lowest return for a quarter was (26.05)% (quarter ended 12/31/2008).
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel highest return for a quarter
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Jun. 30, 2009
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 13.19%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel lowest return for a quarter
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Dec. 31, 2008
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (26.05%)
Performance Table Market Index Changed rr_PerformanceTableMarketIndexChanged On December 30, 2016, the Fund changed its primary benchmark from the MSCI ACWI Large Cap Index (Net) to the MSCI ACWI Investable Market Index (Net) to reflect the Fund’s current strategy and its ability to invest across the entire capitalization range of equity securities throughout the world.
Index No Deduction for Fees, Expenses, Taxes [Text] rr_IndexNoDeductionForFeesExpensesTaxes (reflects no deduction for fees, expenses or income taxes)
Performance Table Uses Highest Federal Rate rr_PerformanceTableUsesHighestFederalRate After-tax returns are calculated using the historical highest individual federal marginal income tax rate, and do not reflect the impact of state and local taxes.
Performance Table Not Relevant to Tax Deferred rr_PerformanceTableNotRelevantToTaxDeferred After-tax returns shown are not relevant to tax-exempt investors or those who hold Fund shares through tax-deferred arrangements such as 401(k) plans or Individual Retirement Accounts.
Performance Table Closing [Text Block] rr_PerformanceTableClosingTextBlock

After-tax returns are calculated using the historical highest individual federal marginal income tax rate, and do not reflect the impact of state and local taxes. Actual after-tax returns depend on the investor’s tax situation and may differ from those shown. After-tax returns shown are not relevant to tax-exempt investors or those who hold Fund shares through tax-deferred arrangements such as 401(k) plans or Individual Retirement Accounts.
Caption rr_AverageAnnualReturnCaption Average Annual Total Returns (for the periods ended 12/31/2016)
Old Westbury All Cap Core Fund | MSCI ACWI IMI (Net) (reflects no deduction for fees, expenses or income taxes)  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 8.36%
5 Years rr_AverageAnnualReturnYear05 9.61%
10 Years rr_AverageAnnualReturnYear10 3.84%
Old Westbury All Cap Core Fund | MSCI ACWI Large Cap Index (Net) (reflects no deduction for fees, expenses or income taxes)  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 8.00%
5 Years rr_AverageAnnualReturnYear05 9.26%
10 Years rr_AverageAnnualReturnYear10 3.48%
Old Westbury All Cap Core Fund | 90% MSCI US Gross &10% MSCI ACWI ex USA (Net) (reflects no deduction for fees, expenses or income taxes)  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 10.91%
5 Years rr_AverageAnnualReturnYear05 13.61%
10 Years rr_AverageAnnualReturnYear10 6.43%
Old Westbury All Cap Core Fund | Old Westbury All Cap Core Fund  
Risk/Return: rr_RiskReturnAbstract  
Management Fees rr_ManagementFeesOverAssets 0.71% [1]
Other Expenses rr_OtherExpensesOverAssets 0.33%
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.01%
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 1.05% [2]
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 2007 rr_AnnualReturn2007 6.94%
Annual Return 2008 rr_AnnualReturn2008 (37.69%)
Annual Return 2009 rr_AnnualReturn2009 29.59%
Annual Return 2010 rr_AnnualReturn2010 6.41%
Annual Return 2011 rr_AnnualReturn2011 (10.55%)
Annual Return 2012 rr_AnnualReturn2012 8.93%
Annual Return 2013 rr_AnnualReturn2013 23.80%
Annual Return 2014 rr_AnnualReturn2014 6.52%
Annual Return 2015 rr_AnnualReturn2015 (4.57%)
Annual Return 2016 rr_AnnualReturn2016 7.32%
1 Year rr_AverageAnnualReturnYear01 7.32%
5 Years rr_AverageAnnualReturnYear05 8.03%
10 Years rr_AverageAnnualReturnYear10 1.92%
Old Westbury All Cap Core Fund | Old Westbury All Cap Core Fund | After Taxes on Distributions  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 7.05%
5 Years rr_AverageAnnualReturnYear05 7.47%
10 Years rr_AverageAnnualReturnYear10 1.55%
Old Westbury All Cap Core Fund | Old Westbury All Cap Core Fund | After Taxes on Distributions and Sale of Fund Shares  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 4.37%
5 Years rr_AverageAnnualReturnYear05 6.37%
10 Years rr_AverageAnnualReturnYear10 1.55%
[1] The Management Fee has been restated to reflect the increase in the management fee effective December 30, 2016.
[2] Total Annual Fund Operating Expenses will not agree with the ratio of expenses to average net assets before expense waivers in the Fund's Financial Highlights, as the Financial Highlights reflect actual direct operating expenses of the Fund and do not include Acquired Fund Fees and Expenses.