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Risk/Return: rr_RiskReturnAbstract  
Registrant Name dei_EntityRegistrantName T. Rowe Price Institutional International Funds, Inc.
Prospectus Date rr_ProspectusDate May 01, 2013
T. Rowe Price Institutional Emerging Markets Bond Fund
  
Risk/Return: rr_RiskReturnAbstract  
Risk/Return [Heading] rr_RiskReturnHeading SUMMARY

T. Rowe Price Institutional Emerging Markets Bond Fund
Objective [Heading] rr_ObjectiveHeading Investment Objective
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock The fund seeks to provide high 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.
Shareholder Fees Caption [Text] rr_ShareholderFeesCaption Fees and Expenses of the Fund

Shareholder fees (fees paid directly from your investment)
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 transaction 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 most recent fiscal year, the fund’s portfolio turnover rate was 44.4% of the average value of its portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 44.40%
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 and then redeem all of your shares at the end of those periods. The example also assumes that your investment has a 5% return each year and that the 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 Investments, Risks, and Performance

Principal Investment Strategies
Strategy Narrative [Text Block] rr_StrategyNarrativeTextBlock The fund will normally invest at least 80% (and potentially all) of its net assets (including any borrowings for investment purposes) in debt securities of emerging market governments or companies located in emerging market countries. Fund holdings may be denominated in U.S. dollars or non-U.S. dollar currencies, including emerging market currencies. The extent, if any, to which the fund attempts to cushion the impact of foreign currency fluctuations on the dollar depends on market conditions. Fund holdings may include the lowest-rated bonds, including those in default, and there are no overall limits on the fund's investments that are rated below investment-grade (BB or lower, or an equivalent rating), also known as “junk” bonds.

Although we expect to maintain an intermediate- to long-term weighted average maturity for the fund, there are no maturity restrictions on the overall portfolio or on individual securities. Security selection relies heavily on research, which analyzes political and economic trends as well as creditworthiness. The fund allocates investments among a variety of emerging markets (1) in order to establish a diverse portfolio; (2) based on the relative value of opportunities and associated risks within one country versus others; and (3) with a view to the liquidity of each particular market. The fund tends to favor bonds it expects will be upgraded. The fund sells holdings for a variety of reasons, such as to adjust its average maturity or credit quality, to shift assets into and out of higher-yielding securities, or to alter geographic or currency exposure.

The fund is “nondiversified,” meaning it may invest a greater portion of its assets in fewer issuers than is permissible for a “diversified” fund.

While most assets will be invested in bonds, the fund may enter into forward currency exchange contracts in keeping with the fund's objectives. Forward currency exchange contracts would primarily be used to help protect the fund's holdings from unfavorable changes in foreign currency exchange rates, although other currency hedging techniques may be used from time to time.
Risk [Heading] rr_RiskHeading Principal Risks
Risk Narrative [Text Block] rr_RiskNarrativeTextBlock As with any mutual fund, there is no guarantee that the fund will achieve its objective. The fund's share price fluctuates, which means you could lose money by investing in the fund. The principal risks of investing in this fund are summarized as follows:

Active management risk The fund is subject to the risk that the investment adviser's judgments about the attractiveness, value, or potential appreciation of the fund's investments may prove to be incorrect. If the securities selected and strategies employed by the fund fail to produce the intended results, the fund could underperform other funds with similar objectives and investment strategies.

International investing risk Investing in the securities of non-U.S. issuers involves special risks not typically associated with investing in U.S. securities. International securities tend to be more volatile and less liquid than investments in U.S. securities and may lose value because of adverse political, social, or economic developments overseas. In addition, international investments may be subject to regulatory and accounting standards that differ from those of the U.S.

Emerging markets risk The risks of international investing are heightened for securities of issuers in emerging market countries. Emerging market countries tend to have economic structures that are less diverse and mature, and political systems that are less stable, than those of developed countries. In addition to all of the risks of investing in international developed markets, emerging markets are more susceptible to governmental interference, local taxes being imposed on international investments, restrictions on gaining access to sales proceeds, and less liquid and efficient trading markets.

Currency risk Because the fund may invest in securities issued in foreign currencies, the fund is subject to the risk that it could experience losses based solely on the weakness of foreign currencies versus the U.S. dollar and changes in the exchange rates between such currencies and the U.S. dollar. Any attempts at currency hedging may not be successful and could cause the fund to lose money.

Credit risk This is the risk that an issuer of a debt security could suffer an adverse change in financial condition that results in a payment default, security downgrade, or inability to meet a financial obligation. The risk of default is much greater for emerging market bonds and securities rated as below investment-grade ("junk" bonds). The fund is exposed to greater credit risk than other bond funds because companies in emerging markets are usually not as strong financially and are more susceptible to economic downturns. Junk bonds should be considered speculative as they carry greater risks of default and erratic price swings due to real or perceived changes in the credit quality of the issuer.

Interest rate risk This risk refers to the chance that interest rates will increase, causing a decline in bond prices. (Bond prices and interest rates usually move in opposite directions.) Generally, securities with longer maturities and funds with longer weighted average maturities carry greater interest rate risk.

Liquidity risk This is the risk that the fund may not be able to sell a holding in a timely manner at a desired price.

Nondiversification risk As a nondiversified fund, the fund has the ability to invest a larger percentage of its assets in the securities of a smaller number of issuers than a diversified fund. As a result, poor performance by a single issuer could adversely affect fund performance more than if the fund were invested in a larger number of issuers. The fund's share price can be expected to fluctuate more than that of a comparable diversified fund.

Derivatives risk To the extent the fund uses forward currency exchange contracts, it is exposed to greater volatility and losses in comparison to investing directly in foreign bonds. Forward currency exchange contracts are also subject to the risks that anticipated currency movements will not be accurately predicted, a counterparty will fail to perform in accordance with the terms of the agreement, and the chance that potential government regulation could negatively affect the fund's investments in such instruments.
Risk Lose Money [Text] rr_RiskLoseMoney The fund's share price fluctuates, which means you could lose money by investing in the fund.
Risk Nondiversified Status [Text] rr_RiskNondiversifiedStatus Nondiversification risk As a nondiversified fund, the fund has the ability to invest a larger percentage of its assets in the securities of a smaller number of issuers than a diversified fund. As a result, poor performance by a single issuer could adversely affect fund performance more than if the fund were invested in a larger number of issuers. The fund's share price can be expected to fluctuate more than that of a comparable diversified fund.
Bar Chart and Performance Table [Heading] rr_BarChartAndPerformanceTableHeading Performance
Performance Narrative [Text Block] rr_PerformanceNarrativeTextBlock The bar chart showing calendar year returns and the average annual total returns table indicate risk by illustrating how much returns can differ from one year to the next and how fund performance compares with that of a comparable market index. The fund’s past performance (before and after taxes) is not necessarily an indication of future performance.

The fund can also experience short-term performance swings, as shown by the best and worst calendar quarter returns during the years depicted.
Performance Information Illustrates Variability of Returns [Text] rr_PerformanceInformationIllustratesVariabilityOfReturns The bar chart showing calendar year returns and the average annual total returns table indicate risk by illustrating how much returns can differ from one year to the next and how fund performance compares with that of a comparable market index.
Performance Availability Phone [Text] rr_PerformanceAvailabilityPhone 1-800-638-8790
Performance Availability Website Address [Text] rr_PerformanceAvailabilityWebSiteAddress troweprice.com
Performance Past Does Not Indicate Future [Text] rr_PerformancePastDoesNotIndicateFuture The fund’s past performance (before and after taxes) is not necessarily an indication of future performance.
Bar Chart [Heading] rr_BarChartHeading Institutional Emerging Markets Bond Fund
Calendar Year Returns
Bar Chart Closing [Text Block] rr_BarChartClosingTextBlock
           
    Quarter   Total  
    Ended   Return  
Best Quarter   6/30/09   13.37%  
Worst Quarter   12/31/08   -11.29%  
Performance Table Heading rr_PerformanceTableHeading Average Annual Total Returns

Periods ended
December 31, 2012
Performance Table Uses Highest Federal Rate rr_PerformanceTableUsesHighestFederalRate After-tax returns are calculated using the historical highest individual federal marginal income tax rates 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 an investor’s tax situation and may differ from those shown. After-tax returns shown are not relevant to investors who hold their fund shares through tax-deferred arrangements, such as a 401(k) account or individual retirement account.
Performance Table Narrative rr_PerformanceTableNarrativeTextBlock In addition, the average annual total returns table shows hypothetical after-tax returns to suggest how taxes paid by a shareholder may influence returns. After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. Actual after-tax returns depend on an investor’s tax situation and may differ from those shown. After-tax returns shown are not relevant to investors who hold their fund shares through tax-deferred arrangements, such as a 401(k) account or individual retirement account.
Performance Table Closing [Text Block] rr_PerformanceTableClosingTextBlock Updated performance information is available through troweprice.com or may be obtained by calling 1-800-638-8790.
T. Rowe Price Institutional Emerging Markets Bond Fund | T. Rowe Price Institutional Emerging Markets Bond Fund
  
Risk/Return: rr_RiskReturnAbstract  
Redemption fee (as a percentage of amount redeemed on shares held for 90 days or less) rr_RedemptionFeeOverRedemption 2.00%
Management fees rr_ManagementFeesOverAssets 0.70%
Other expenses rr_OtherExpensesOverAssets none
Total annual fund operating expenses rr_ExpensesOverAssets 0.70%
1 year rr_ExpenseExampleYear01 72
3 years rr_ExpenseExampleYear03 224
5 years rr_ExpenseExampleYear05 390
10 years rr_ExpenseExampleYear10 871
2007 rr_AnnualReturn2007 5.15%
2008 rr_AnnualReturn2008 (17.48%)
2009 rr_AnnualReturn2009 35.63%
2010 rr_AnnualReturn2010 14.23%
2011 rr_AnnualReturn2011 2.84%
2012 rr_AnnualReturn2012 18.58%
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel Best Quarter
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Jun. 30, 2009
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 13.37%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel Worst Quarter
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Dec. 31, 2008
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (11.29%)
1 Year rr_AverageAnnualReturnYear01 18.58%
5 Years rr_AverageAnnualReturnYear05 9.29%
Since inception rr_AverageAnnualReturnSinceInception 8.72%
Inception Date rr_AverageAnnualReturnInceptionDate Nov. 30, 2006
T. Rowe Price Institutional Emerging Markets Bond Fund | Returns after taxes on distributions | T. Rowe Price Institutional Emerging Markets Bond Fund
  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 15.82%
5 Years rr_AverageAnnualReturnYear05 6.24%
Since inception rr_AverageAnnualReturnSinceInception 5.88%
Inception Date rr_AverageAnnualReturnInceptionDate Nov. 30, 2006
T. Rowe Price Institutional Emerging Markets Bond Fund | Returns after taxes on distributions and sale of fund shares | T. Rowe Price Institutional Emerging Markets Bond Fund
  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 12.29%
5 Years rr_AverageAnnualReturnYear05 6.17%
Since inception rr_AverageAnnualReturnSinceInception 5.82%
Inception Date rr_AverageAnnualReturnInceptionDate Nov. 30, 2006
T. Rowe Price Institutional Emerging Markets Bond Fund | J.P. Morgan Emerging Markets Bond Index Global Diversified (reflects no deduction for fees, expenses, or taxes)
  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 17.44%
5 Years rr_AverageAnnualReturnYear05 10.07%
Since inception rr_AverageAnnualReturnSinceInception 9.38%