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Label Element Value
Risk/Return: rr_RiskReturnAbstract  
Document Type dei_DocumentType 485BPOS
Document Period End Date dei_DocumentPeriodEndDate Dec. 31, 2011
Registrant Name dei_EntityRegistrantName PRUDENTIALS GIBRALTAR FUND
Central Index Key dei_EntityCentralIndexKey 0000080946
Amendment Flag dei_AmendmentFlag false
Document Creation Date dei_DocumentCreationDate Mar. 27, 2012
Document Effective Date dei_DocumentEffectiveDate Apr. 16, 2012
Prospectus Date rr_ProspectusDate Apr. 16, 2012
PRUDENTIALS GIBRALTAR FUND
  
Risk/Return: rr_RiskReturnAbstract  
Risk/Return [Heading] rr_RiskReturnHeading Prudential’s Gibraltar Fund
FUND SUMMARY
Objective [Heading] rr_ObjectiveHeading
Investment Objective
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock The investment objective of the Fund is growth of capital to an extent compatible with a concern for preservation of principal. Current income, if any, is incidental.
Expense [Heading] rr_ExpenseHeading
Fund 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. This table does not show charges that are imposed by the investment plan contracts or the variable annuity contracts. Because contract charges are not included, the total fees and expenses that you will incur will be higher than the fees and expenses set forth in the table. See your contract for additional information about contract charges.
Operating Expenses: rr_OperatingExpensesAbstract  
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 Fund’s most recent fiscal year, the Fund’s portfolio turnover rate was 28% of the average value of its portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 28.00%
Expense Example: rr_ExpenseExampleAbstract  
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 following example does not include the effect of contract charges. For more information about contract charges see your contract.

The example assumes that you invest $10,000 in shares of the Fund for the time periods indicated. The example assumes a 5% return each year and that the Fund’s operating expenses remain the same as shown in the chart above. The figures shown would be the same whether or not you sold your shares at the end of each period. Although your actual costs may be higher or lower, based on these assumptions your costs would be:
Expense Example, No Redemption: rr_ExpenseExampleNoRedemptionAbstract  
Strategy [Heading] rr_StrategyHeading
Investments, Risks and Performance
Principal Investment Strategies.
Strategy Narrative [Text Block] rr_StrategyNarrativeTextBlock

The Fund invests primarily in common stock and other securities convertible into common stock. Those investments can include American Depository Receipts, which are dollar-denominated certificates representing a right to receive securities of a foreign issuer.

The Fund’s portfolio managers seek to invest in medium to large companies that they believe possess sustainable, above-market growth in revenues, earnings, and cash flows and reasonable valuations, resulting in a portfolio that exhibits growth characteristics blended with valuations comparable to that of the market.
Risk [Heading] rr_RiskHeading
Principal Risks of Investing in the Fund.
Risk Narrative [Text Block] rr_RiskNarrativeTextBlock

All investments have risks to some degree. Please remember that an investment in the Fund is subject to investment risks. Loss of money is a risk of investing in the Fund.

Equity securities risk. There is the risk that the value or price of a particular stock or other equity or equity-related security owned by the Fund could go down and you could lose money. In addition to an individual stock losing value, the value of the equity markets or a sector of those markets in which the Fund invests could go down.

Growth style risk. There is a risk that the growth investment style may be out of favor for a period of time. Investors often expect growth companies to increase their earnings at a certain rate.

Market and management risk. Markets in which the Fund invests may experience volatility and go down in value, and possibly sharply and unpredictably. All decisions by an adviser require judgment and are based on imperfect information. Additionally, the investment techniques, risk analysis and investment strategies used by an adviser in making investment decisions for the Fund may not produce the desired results.

Expense risk. Your actual cost of investing in the Fund may be higher than the expenses shown in “Annual Fund Operating Expenses,” above for a variety of reasons, including, for example, if the Fund’s average net assets decreases significantly.
Risk Lose Money [Text] rr_RiskLoseMoney Loss of money is a risk of investing in the Fund.
Bar Chart and Performance Table [Heading] rr_BarChartAndPerformanceTableHeading
Past Performance.
Performance Narrative [Text Block] rr_PerformanceNarrativeTextBlock The information provided below provides some indication of the risks of investing in the Fund by showing changes in the Fund’s performance from year to year and by showing how the Fund’s average annual total returns for 1, 5, and 10 years compare with those of a broad measure of market performance and a group of similar mutual funds. Past performance does not mean that the Fund will achieve similar results in the future. The Fund’s returns are shown after deduction of Fund expenses. They do not include any charges under the investment contracts or variable annuity contracts. If those contract charges were included, the annual returns would be lower than those shown.
Performance Information Illustrates Variability of Returns [Text] rr_PerformanceInformationIllustratesVariabilityOfReturns The information provided below provides some indication of the risks of investing in the Fund by showing changes in the Fund’s performance from year to year and by showing how the Fund’s average annual total returns for 1, 5, and 10 years compare with those of a broad measure of market performance and a group of similar mutual funds.
Performance Past Does Not Indicate Future [Text] rr_PerformancePastDoesNotIndicateFuture Past performance does not mean that the Fund will achieve similar results in the future.
Bar Chart Table: rr_BarChartTableAbstract  
Bar Chart [Heading] rr_BarChartHeading
Annual Total Returns (Class I Shares)
Bar Chart Closing [Text Block] rr_BarChartClosingTextBlock
Best Quarter: Worst Quarter:
15.27% 2nd Quarter 2003 -21.77% 4th Quarter 2008
Average Annual Return: rr_AverageAnnualReturnAbstract  
Performance Table Heading rr_PerformanceTableHeading
Average Annual Total Returns % (For the periods ended December 31, 2011)
PRUDENTIALS GIBRALTAR FUND | PRUDENTIALS GIBRALTAR FUND
  
Operating Expenses: rr_OperatingExpensesAbstract  
Management Fees rr_ManagementFeesOverAssets 0.55%
Distribution (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Other Expenses rr_OtherExpensesOverAssets 0.07%
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 0.62%
Expense Example: rr_ExpenseExampleAbstract  
1 Year rr_ExpenseExampleYear01 63
3 Years rr_ExpenseExampleYear03 199
5 Years rr_ExpenseExampleYear05 346
10 Years rr_ExpenseExampleYear10 774
Expense Example, No Redemption: rr_ExpenseExampleNoRedemptionAbstract  
1 Year rr_ExpenseExampleNoRedemptionYear01 63
3 Years rr_ExpenseExampleNoRedemptionYear03 199
5 Years rr_ExpenseExampleNoRedemptionYear05 346
10 Years rr_ExpenseExampleNoRedemptionYear10 774
Bar Chart Table: rr_BarChartTableAbstract  
2002 rr_AnnualReturn2002 (26.23%)
2003 rr_AnnualReturn2003 29.99%
2004 rr_AnnualReturn2004 11.27%
2005 rr_AnnualReturn2005 11.74%
2006 rr_AnnualReturn2006 5.32%
2007 rr_AnnualReturn2007 11.72%
2008 rr_AnnualReturn2008 (35.21%)
2009 rr_AnnualReturn2009 40.15%
2010 rr_AnnualReturn2010 6.54%
2011 rr_AnnualReturn2011 1.57%
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel Best Quarter:
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Jun. 30, 2003
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 15.27%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel Worst Quarter:
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Dec. 31, 2008
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (21.77%)
Average Annual Return: rr_AverageAnnualReturnAbstract  
One Year rr_AverageAnnualReturnYear01 1.57%
Five Years rr_AverageAnnualReturnYear05 1.88%
Ten Years rr_AverageAnnualReturnYear10 3.26%
PRUDENTIALS GIBRALTAR FUND | S&P 500 Index (reflects no deduction for fees, expenses or taxes)
  
Average Annual Return: rr_AverageAnnualReturnAbstract  
One Year rr_AverageAnnualReturnYear01 2.09%
Five Years rr_AverageAnnualReturnYear05 (0.25%)
Ten Years rr_AverageAnnualReturnYear10 2.92%
PRUDENTIALS GIBRALTAR FUND | Lipper Average (reflects no deduction for fees, expenses or taxes)
  
Average Annual Return: rr_AverageAnnualReturnAbstract  
One Year rr_AverageAnnualReturnYear01 (1.01%)
Five Years rr_AverageAnnualReturnYear05 (1.17%)
Ten Years rr_AverageAnnualReturnYear10 2.41%