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Risk/Return: rr_RiskReturnAbstract  
Registrant Name dei_EntityRegistrantName T. Rowe Price Institutional International Funds, Inc.
Prospectus Date rr_ProspectusDate Mar. 01, 2016
T. Rowe Price Institutional Global Growth Equity Fund  
Risk/Return: rr_RiskReturnAbstract  
Risk/Return [Heading] rr_RiskReturnHeading SUMMARY

T. Rowe Price Institutional Global Growth Equity Fund
Objective [Heading] rr_ObjectiveHeading Investment Objective
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock The fund seeks long-term growth of capital through investments primarily in the common stocks of large-cap companies throughout the world, including the U.S.
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)
Fee Waiver or Reimbursement over Assets, Date of Termination rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination February 28, 2017
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 106.0% of the average value of its portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 106.00%
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 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, the fund’s operating expenses remain the same, and the expense limitation currently in place is not renewed. The figures have been adjusted to reflect fee waivers or expense reimbursements only in the periods for which the expense limitation arrangement is expected to continue. 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% of its net assets (including any borrowings for investment purposes) in stocks of large-cap companies. Under normal conditions, the fund will invest in at least five countries, one of which will be the U.S., and at least 40% of its net assets will be invested in stocks of large-cap companies outside the U.S., including companies in emerging markets (at least 30% of its net assets will be invested in stocks of large-cap companies outside the U.S. if foreign market conditions are not favorable).

The fund defines a large-cap company as one whose market capitalization (number of shares outstanding multiplied by share price) falls within or above the applicable range for companies included in the MSCI All Country World Large Cap Index. The fund’s and MSCI, Inc.’s definition of a large-cap company depends on whether the company is located in a developed market or an emerging market. As of December 31, 2015, the Index’s market capitalization range for large-cap companies in developed markets was approximately $4 billion to $587 billion, and the market capitalization range for large-cap companies in emerging markets was approximately $2 billion to $243 billion. The fund also relies on MSCI, Inc. to classify a particular country as developed or emerging. The market capitalization of the companies in the fund’s portfolio and the Index changes over time; the fund will not automatically sell or cease to purchase additional stock of a company it already owns just because the company’s market capitalization falls below the range of the Index.

While the adviser invests with an awareness of the global economic backdrop and the adviser’s outlook for certain industries, sectors, and individual countries, the adviser’s decision-making process focuses on bottom-up stock selection. Country allocation is driven largely by stock selection, though the adviser may limit investments in markets or industries that appear to have poor overall prospects.

Security selection reflects a growth style. The fund relies on a global team of investment analysts dedicated to in-depth fundamental research in an effort to identify companies capable of achieving and sustaining above-average, long-term earnings growth. The adviser seeks to purchase stocks of companies at reasonable prices in relation to present or anticipated earnings, cash flow, or book value.

In selecting investments, the fund generally favors companies with one or more of the following characteristics:
  • leading or improving market position;
  • attractive business niche;
  • attractive or improving franchise or industry position;
  • seasoned management;
  • stable or improving earnings and/or cash flow; and
  • sound or improving balance sheet.
The fund may sell securities for a variety of reasons, such as to secure gains, limit losses, or redeploy assets into more promising opportunities.
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 investments selected and strategies employed by the fund fail to produce the intended results, the fund could underperform in comparison to other funds with similar objectives and investment strategies.

Risks of stock investing Stocks generally fluctuate in value more than bonds and may decline significantly over short time periods. There is a chance that stock prices overall will decline because stock markets tend to move in cycles, with periods of rising and falling prices. The value of a stock in which the fund invests may decline due to general weakness in the stock market, or because of factors that affect a particular company or industry.

International investing risk Investing in the securities of non-U.S. issuers involves special risks not typically associated with investing in U.S. issuers. International securities tend to be more volatile and less liquid than investments in U.S. securities and may lose value because of adverse local, political, social, or economic developments overseas, or due to changes in the exchange rates between foreign currencies and the U.S. dollar. In addition, international investments are subject to settlement practices and regulatory and financial reporting standards that differ from those of the U.S. These risks are heightened for the fund’s investments in emerging markets.

Investment style risk Different investment styles tend to shift in and out of favor depending on market conditions and investor sentiment. The fund’s growth approach to investing could cause it to underperform when compared to other stock funds that employ a different investment style. Growth stocks tend to be more volatile than certain other types of stocks, and their prices may fluctuate more dramatically than the overall stock market. A stock with growth characteristics can have sharp price declines due to decreases in current or expected earnings and may lack dividends that can help cushion its share price in a declining market.

Market capitalization risk Although stocks issued by larger companies tend to have less overall volatility than stocks issued by smaller companies, larger companies may not be able to attain the high growth rates of successful smaller companies, especially during strong economic periods. In addition, larger companies may be less capable of responding quickly to competitive challenges and industry changes, and may suffer sharper price declines as a result of earnings disappointments.
Risk Lose Money [Text] rr_RiskLoseMoney The fund’s share price fluctuates, which means you could lose money by investing in the 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 provide some indications of the risks of investing in the fund by showing how much returns can differ from year to year and how the fund’s average annual returns for certain periods compare with the returns of a relevant broad-based market index, as well as with the returns of other comparative indexes that have investment characteristics similar to those of the fund. The fund’s performance information represents only past performance (before and after taxes) and is not necessarily an indication of future results.

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 provide some indications of the risks of investing in the fund by showing how much returns can differ from year to year and how the fund’s average annual returns for certain periods compare with the returns of a relevant broad-based market index, as well as with the returns of other comparative indexes that have investment characteristics similar to those of the fund.
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 performance information represents only past performance (before and after taxes) and is not necessarily an indication of future results.
Bar Chart [Heading] rr_BarChartHeading Institutional Global Growth Equity Fund
Calendar Year Returns
Bar Chart Closing [Text Block] rr_BarChartClosingTextBlock
  Quarter
 Ended		  Total
Return
Best Quarter   6/30/09  27.42%
Worst Quarter  9/30/11 -19.59%
Performance Table Heading rr_PerformanceTableHeading Average Annual Total Returns

Periods ended
December 31, 2015
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 Explanation after Tax Higher rr_PerformanceTableExplanationAfterTaxHigher In some cases, the figure shown for “returns after taxes on distributions and sale of fund shares” may be higher than the figure shown for “returns before taxes” because the calculations assume the investor received a tax deduction for any loss incurred on the sale of shares.
Performance Table Narrative rr_PerformanceTableNarrativeTextBlock In addition, the average annual total returns table shows hypothetical after-tax returns to demonstrate 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. In some cases, the figure shown for “returns after taxes on distributions and sale of fund shares” may be higher than the figure shown for “returns before taxes” because the calculations assume the investor received a tax deduction for any loss incurred on the sale of shares.
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 Global Growth Equity Fund | T. Rowe Price Institutional Global Growth Equity 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 0.65%
Other expenses rr_OtherExpensesOverAssets 0.12%
Total annual fund operating expenses rr_ExpensesOverAssets 0.77%
Fee waiver/expense reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.02%) [1]
Total annual fund operating expenses after fee waiver/expense reimbursement rr_NetExpensesOverAssets 0.75% [1]
1 year rr_ExpenseExampleYear01 $ 77
3 years rr_ExpenseExampleYear03 244
5 years rr_ExpenseExampleYear05 426
10 years rr_ExpenseExampleYear10 $ 952
2009 rr_AnnualReturn2009 50.15%
2010 rr_AnnualReturn2010 14.52%
2011 rr_AnnualReturn2011 (10.28%)
2012 rr_AnnualReturn2012 21.99%
2013 rr_AnnualReturn2013 20.33%
2014 rr_AnnualReturn2014 8.56%
2015 rr_AnnualReturn2015 1.44%
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel Best Quarter
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Jun. 30, 2009
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 27.42%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel Worst Quarter
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Sep. 30, 2011
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (19.59%)
1 Year rr_AverageAnnualReturnYear01 1.44%
5 Years rr_AverageAnnualReturnYear05 7.72%
Since inception rr_AverageAnnualReturnSinceInception 16.66%
Inception Date rr_AverageAnnualReturnInceptionDate Oct. 27, 2008
T. Rowe Price Institutional Global Growth Equity Fund | Returns after taxes on distributions | T. Rowe Price Institutional Global Growth Equity Fund  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 0.14%
5 Years rr_AverageAnnualReturnYear05 6.25%
Since inception rr_AverageAnnualReturnSinceInception 15.08%
Inception Date rr_AverageAnnualReturnInceptionDate Oct. 27, 2008
T. Rowe Price Institutional Global Growth Equity Fund | Returns after taxes on distributions and sale of fund shares | T. Rowe Price Institutional Global Growth Equity Fund  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 1.24%
5 Years rr_AverageAnnualReturnYear05 5.66%
Since inception rr_AverageAnnualReturnSinceInception 13.31%
Inception Date rr_AverageAnnualReturnInceptionDate Oct. 27, 2008
T. Rowe Price Institutional Global Growth Equity Fund | MSCI All Country World Index (reflects no deduction for fees, expenses, or taxes)  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 (1.84%)
5 Years rr_AverageAnnualReturnYear05 6.66%
Since inception rr_AverageAnnualReturnSinceInception 12.80%
T. Rowe Price Institutional Global Growth Equity Fund | Lipper Global Multi-Cap Growth Funds Average  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 0.59%
5 Years rr_AverageAnnualReturnYear05 6.61%
Since inception rr_AverageAnnualReturnSinceInception 10.92% [2]
Inception Date rr_AverageAnnualReturnInceptionDate Oct. 31, 2008
[1] T. Rowe Price Associates, Inc. has agreed (through February 28, 2017) to waive its fees and/or bear any expenses (excluding interest, expenses related to borrowings, taxes and brokerage, extraordinary expenses, and acquired fund fees) that would cause the fund’s ratio of expenses to average daily net assets to exceed 0.75%. Termination of the agreement would require approval by the fund’s Board of Directors. Fees waived and expenses paid under this agreement (and a previous limitation of 0.75%) are subject to reimbursement to T. Rowe Price Associates, Inc. by the fund whenever the fund’s expense ratio is below 0.75%. However, no reimbursement will be made more than three years after the waiver or payment, or if it would result in the expense ratio exceeding 0.75% (excluding interest, expenses related to borrowings, taxes and brokerage, extraordinary expenses, and acquired fund fees).
[2] Returns as of 10/31/08.