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

The Fund’s goal is to seek total return (consisting of current income and 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)
Fee Waiver or Reimbursement over Assets, Date of Termination rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination Oct. 31, 2019
Portfolio Turnover [Heading] rr_PortfolioTurnoverHeading Portfolio Turnover
Portfolio Turnover [Text Block] rr_PortfolioTurnoverTextBlock

The Fund pays transaction costs, such as commission, 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 68% of the average value of its portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 68.00%
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 (taking into account the contractual expense limitation). 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 invests primarily in a diversified portfolio of investment-grade bonds and notes of any maturity. The Fund invests at least 80% of its net assets, plus borrowings for investment purposes, in investment-grade fixed income securities including corporate, asset-backed, mortgage-backed, and U.S. Government securities. The Adviser attempts to manage the Fund’s “total return” (which includes both changes in principal value of the Fund’s securities and income earned) by lengthening or shortening the average maturity of the Fund’s securities according to whether the Adviser expects market interest rates to rise or decline. The Fund may also engage in futures and options transactions, both to increase return and/or to hedge, or protect, its exposure to, for example, interest rate movements, movements in the commodities or securities markets and currency value fluctuations. In addition, the Fund may invest in exchange-traded funds (“ETFs”), convertible securities, municipal securities, and inflation-protected securities such as Treasury Inflation Protected Securities (“TIPS”) and similar bonds issued by governments outside of the U.S. fixed income securities held by the Fund may be of any maturity.
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.


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.


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.


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.


Liquidity Risk — Liquidity risk refers to the possibility that it may be difficult or impossible to sell certain positions within an acceptable time frame or at an acceptable price.


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.


Inflation-Protected Securities Risk —The value of an inflation-protected debt security generally will fall when real interest rates rise.


Mortgage-Backed and Asset-Backed Securities Risk —Securities representing interests in “pools” of mortgages or other assets are subject to various risks, including prepayment and contraction risk, risk of default of the underlying mortgage or assets and delinquencies and losses of the underlying mortgage or assets.


Municipal Securities Risk —Prices of municipal securities rise and fall in response to interest rate changes and local political and economic factors may adversely affect the value and liquidity of these securities. In addition, the Fund’s investments in municipal securities are subject to the risks associated with a lack of liquidity in the municipal bond market.


Convertible Securities Risk —Convertible securities are subject to interest rate risk, the risk that the issuer will not be able to pay interest or dividend when due, the risk that their market value may change based on changes to the issuer’s credit ratings or the market’s perception of the issuer’s creditworthiness, and the risk that their value may not increase or decrease as rapidly as the underlying common stock.


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.


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 Bank of America Merrill Lynch 1-10 Year AAA-A US Corporate & Government Index. 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.
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 Bank of America Merrill Lynch 1-10 Year AAA-A US Corporate & Government Index.
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 7.61% (quarter ended 12/31/2008) and the lowest return for a quarter was (2.22)% (quarter ended 12/31/2016).
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel highest return for a quarter
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Dec. 31, 2008
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 7.61%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel lowest return for a quarter
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Dec. 31, 2016
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (2.22%)
Index No Deduction for Fees, Expenses, Taxes [Text] rr_IndexNoDeductionForFeesExpensesTaxes (reflects no deduction for fees, expenses, or income and withholding 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 Explanation after Tax Higher rr_PerformanceTableExplanationAfterTaxHigher The Fund Return After Taxes on Distributions and Sale of Shares may be higher than other return figures when a capital loss occurs upon the redemption of Fund shares.
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. The Fund Return After Taxes on Distributions and Sale of Shares may be higher than other return figures when a capital loss occurs upon the redemption of Fund shares.
Caption rr_AverageAnnualReturnCaption Average Annual Total Returns (for the periods ended 12/31/2016)
Old Westbury Fixed Income Fund | Bank of America Merrill Lynch 1-10 Year AAA-A US Corporate & Government Index (reflects no deduction for fees, expenses, or income and withholding taxes)  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 1.51%
5 Years rr_AverageAnnualReturnYear05 1.59%
10 Years rr_AverageAnnualReturnYear10 3.57%
Old Westbury Fixed Income Fund | Old Westbury Fixed Income Fund  
Risk/Return: rr_RiskReturnAbstract  
Management Fees rr_ManagementFeesOverAssets 0.44%
Other Expenses rr_OtherExpensesOverAssets 0.30%
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 0.74%
Less Shareholder Servicing Fee Waiver rr_FeeWaiverOrReimbursementOverAssets (0.10%) [1]
Total Annual Fund Operating Expenses After Fee Waiver rr_NetExpensesOverAssets 0.64% [1]
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 65
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 209
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 384
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 892
Annual Return 2007 rr_AnnualReturn2007 8.21%
Annual Return 2008 rr_AnnualReturn2008 11.19%
Annual Return 2009 rr_AnnualReturn2009 2.48%
Annual Return 2010 rr_AnnualReturn2010 4.85%
Annual Return 2011 rr_AnnualReturn2011 4.41%
Annual Return 2012 rr_AnnualReturn2012 3.19%
Annual Return 2013 rr_AnnualReturn2013 (0.92%)
Annual Return 2014 rr_AnnualReturn2014 1.49%
Annual Return 2015 rr_AnnualReturn2015 0.58%
Annual Return 2016 rr_AnnualReturn2016 0.77%
1 Year rr_AverageAnnualReturnYear01 0.77%
5 Years rr_AverageAnnualReturnYear05 1.01%
10 Years rr_AverageAnnualReturnYear10 3.57%
Old Westbury Fixed Income Fund | Old Westbury Fixed Income Fund | After Taxes on Distributions  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 0.20%
5 Years rr_AverageAnnualReturnYear05 0.29%
10 Years rr_AverageAnnualReturnYear10 2.50%
Old Westbury Fixed Income Fund | Old Westbury Fixed Income Fund | After Taxes on Distributions and Sale of Fund Shares  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 0.44%
5 Years rr_AverageAnnualReturnYear05 0.48%
10 Years rr_AverageAnnualReturnYear10 2.43%
[1] Bessemer Trust Company, N.A. has contractually committed through October 31, 2019 to waive its shareholder servicing fee for the Fund to the extent necessary to maintain a maximum shareholder servicing fee for the Fund at 0.10%. The shareholder servicing fee commitment may be changed or terminated at any time after October 31, 2019 with the approval of the Board of Directors.