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Risk/Return: rr_RiskReturnAbstract  
Registrant Name dei_EntityRegistrantName TRANSAMERICA FUNDS
Prospectus Date rr_ProspectusDate Mar. 01, 2015
Transamerica Commodity Strategy  
Risk/Return: rr_RiskReturnAbstract  
Risk/Return [Heading] rr_RiskReturnHeading TRANSAMERICA COMMODITY STRATEGY
Objective [Heading] rr_ObjectiveHeading Investment Objective:
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock Seeks long-term total return.
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 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 portfolio turnover rate for the fund was 0% of the average value of its portfolio.

Derivative instruments and instruments with a maturity of one year or less at the time of acquisition are excluded from the portfolio turnover rate.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 0.00%rr_PortfolioTurnoverRate
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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 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 Principal Investment Strategies:
Strategy Narrative [Text Block] rr_StrategyNarrativeTextBlock The fund seeks to maintain substantial economic exposure to the performance of the commodities markets. The fund’s sub-adviser, Goldman Sachs Asset Management, L.P. (the “sub-adviser”), primarily gains exposure to commodities markets by investing in a wholly-owned subsidiary of the fund organized as a company under the laws of the Cayman Islands (the “Subsidiary”). The Subsidiary has the same investment objective as the fund and is advised by TAM and sub-advised by the sub-adviser.

The fund intends to seek exposure to commodities markets and returns linked to commodities markets and commodities-related indices, including the Bloomberg Commodity Index Total Return (the “Index”) by investing, through the Subsidiary, in leveraged or unleveraged commodity-linked investments. In pursuing its objective, the fund attempts to provide exposure to the returns of real assets that trade in the commodities markets without direct investment in physical commodities. Real assets include oil, gas, industrial and precious metals, livestock, and agricultural or meat products, or other items that have tangible properties. Commodity-linked investments may be more volatile and less liquid than the underlying commodities and their value may be affected by the performance of commodities as well as weather, tax, regulatory or political developments, overall market movements and other factors affecting the value of particular industries or commodities, such as disease, embargoes, acts of war or terrorism. The fund will also seek to add incremental returns through the use of “roll-timing” or similar strategies as described further below.

The fund’s portfolio will reflect greater than 25% exposure to commodity-related industries.

In pursuing its investment objective, the fund uses the Index as its performance benchmark and will attempt to produce returns that correspond to the performance of the Index, but the fund will not attempt to replicate the Index. The fund may, therefore, invest in securities or other instruments that are not included in the Index.

Investment in the Subsidiary. The fund may invest up to 25% of its total assets in the Subsidiary. The Subsidiary primarily obtains its commodity exposure by investing in commodity-linked swaps (which may include total return index swaps). Commodity-linked swaps are derivative instruments whereby the cash flows agreed upon between counterparties are dependent upon the price of the underlying commodity or commodity index over the life of the swap. The value of the swap will rise and fall in response to changes in the underlying commodity or commodity index. Commodity-linked swaps expose the Subsidiary and the fund economically to movements in commodity prices. Neither the fund nor the Subsidiary invests directly in commodities.

The Subsidiary may also invest in other instruments, including fixed income instruments, either as investments or to serve as margin or collateral for its derivative positions. The Subsidiary is not registered under the Investment Company Act of 1940, as amended (the “1940 Act”), and is not subject to the investor protections of the 1940 Act.

It is expected that certain of the Subsidiary's investments will produce leveraged exposure to the commodities markets.

The fund employs commodity roll-timing strategies. “Rolling” futures exposure is the process by which the holder of a particular futures contract or other instrument providing futures exposure (e.g. swaps) will sell such contract or instrument on or before the expiration date and simultaneously purchase a new contract or instrument with identical terms except for a later expiration date. This process allows a holder of the instrument to extend its current position through the original instrument’s expiration without delivering the underlying asset. The fund’s rolling may differ from that of the Index to the extent necessary to enable the fund to seek excess returns over the Index. The fund’s “roll-timing” strategies may include, for example, rolling the fund’s commodity exposure earlier or later versus the Index, or holding and rolling positions with longer or different expiration dates than the Index.

As discussed above, the fund, through the Subsidiary, primarily gains commodities exposure through the use of swaps and other derivative instruments. The use of swaps is a highly specialized activity which involves investment techniques and risk analyses different from those associated with ordinary portfolio securities transactions.
  • Fixed Income Investments – The fund attempts to enhance return by investing in investment grade fixed income securities, and may invest up to 10% of its assets in non-investment grade fixed income securities. The fund may invest in corporate securities, U.S. government securities, mortgage-backed securities, asset-backed securities, and municipal securities. The average duration will vary. The sub-adviser uses derivatives, including futures and swaps, to manage the duration of the fund's investment portfolio. As a result of the fund's use of derivatives, the fund may hold significant amounts of U.S. Treasury or short-term investments, including money market funds.
  • Other – The fund may also invest in forwards, futures and interest rate swaps to seek to increase total return and/or for hedging purposes. The fund may invest up to 35% of its net assets in foreign securities.
The fund is non-diversified.
Risk [Heading] rr_RiskHeading Principal Risks:
Risk Narrative [Text Block] rr_RiskNarrativeTextBlock Risk is inherent in all investing. Many factors affect the fund's performance. There is no assurance the fund will meet its investment objective. The value of your investment in the fund, as well as the amount of return you receive on your investment, may fluctuate significantly. You may lose part or all of your investment in the fund or your investment may not perform as well as other similar investments. The fund may take temporary defensive positions; in such a case, the fund will not be pursuing its principal investment strategies. The following is a summary description of principal risks (in alphabetical order) of investing in the fund (either directly or through its investments in the Subsidiary). You may lose money if you invest in this fund.
  • Aggressive Investment – The fund's investment strategies, techniques and/or portfolio investments differ from those of many other mutual funds and may be considered aggressive. This approach to investing may expose the fund to additional risks, make the fund a more volatile investment than other mutual funds and cause the fund to perform less favorably than other mutual funds under similar market or economic conditions.
  • CFTC Regulation – The Investment Adviser has registered as a "commodity pool operator" under the Commodity Exchange Act with respect to its service as investment adviser to the fund. The Investment Adviser is therefore subject to dual regulation by the SEC and the Commodity Futures Trading Commission ("CFTC"), and is a member of the National Futures Association and is also subject to its rules. Regulation of commodity investing continues to change, and additional compliance and other expenses may be incurred.
  • Commodities – To the extent the fund invests in commodities or instruments whose performance is linked to the price of an underlying commodity or commodity index, the fund will be subject to the risks of investing in commodities, including regulatory, economic and political developments, weather events and natural disasters and market disruptions. The fund's investment exposure to the commodities markets may subject the fund to greater volatility than investments in more traditional securities, such as stocks and bonds. Commodities and commodity-linked investments may be less liquid than other investments. Commodity-linked investments are subject to the credit risks associated with the issuer, and their values may decline substantially if the issuer's creditworthiness deteriorates.
  • Counterparty – The fund will be subject to credit risk (that is, where changes in an issuer's financial strength or credit rating may affect an instrument's value) with respect to the amount it expects to receive from counterparties to derivatives, repurchase agreements and other financial contracts entered into by the fund or held by special purpose or structured vehicles. If a counterparty becomes bankrupt or otherwise fails to perform its obligations due to financial difficulties, the value of your investment in the fund may decline.
  • Credit – If an issuer or other obligor (such as a party providing insurance or other credit enhancement) of a security held by the fund or a counterparty to a financial contract with the fund defaults or is downgraded, or is perceived to be less creditworthy, or if the value of any underlying assets declines, the value of your investment will typically decline. Below investment grade, high-yield debt securities (commonly known as "junk bonds") have a higher risk of default and are considered speculative. Subordinated securities are more likely to suffer a credit loss than non-subordinated securities of the same issuer and will be disproportionately affected by a default, downgrade or perceived decline in creditworthiness.
  • Currency – The value of investments in securities denominated in foreign currencies increases or decreases as the rates of exchange between those currencies and the U.S. dollar change. Currency conversion costs and currency fluctuations could reduce or eliminate investment gains or add to investment losses. Currency exchange rates can be volatile, and are affected by factors such as general economic conditions, the actions of the U.S. and foreign governments or central banks, the imposition of currency controls, and speculation.
  • Derivatives – Using derivatives exposes the fund to additional risks and can increase fund losses and reduce opportunities for gains when market prices, interest rates or the derivatives themselves behave in a way not anticipated by the fund. Using derivatives also can have a leveraging effect and increase fund volatility. The fund may also have to sell assets at inopportune times to satisfy its obligations. Derivatives may be difficult to sell, unwind or value, and the counterparty may default on its obligations to the fund. The fund's investments in derivative instruments may involve a small investment relative to the amount of investment exposure assumed and may result in losses exceeding the amounts invested in those instruments. Certain derivatives have the potential for unlimited loss, regardless of the size of the initial investment. The U.S. government is in the process of adopting and implementing regulations governing derivatives markets, including mandatory clearing of certain derivatives, margin and reporting requirements. The ultimate impact of the regulations remains unclear. Additional regulation of derivatives may make them more costly, may limit their availability, may disrupt markets or may otherwise adversely affect their value or performance.
  • Emerging Markets – Investments in the securities of issuers located in or principally doing business in emerging markets are subject to foreign investments risks. These risks are greater for investments in issuers in emerging market countries. Emerging market countries tend to have economic, political and legal systems that are less fully developed and are less stable than those of more developed countries. Emerging market securities are often particularly sensitive to market movements because their market prices tend to reflect speculative expectations. Low trading volumes may result in a lack of liquidity and in extreme price volatility.
  • Extension – When interest rates rise, repayments of fixed income securities, particularly asset- and mortgage-backed securities, may occur more slowly than anticipated, extending the effective duration of these fixed income securities at below market interest rates and causing their market prices to decline more than they would have declined due to the rise in interest rates alone. This may cause the fund's share price to be more volatile.
  • Fixed-Income Securities – The market prices of fixed-income securities may go up or down, sometimes rapidly and unpredictably, due to general market conditions, such as real or perceived adverse economic or political conditions, inflation, changes in interest rates, lack of liquidity in the bond markets or adverse investor sentiment. In addition, the market value of a fixed income security may decline if the issuer or other obligor of the security fails to pay principal and/or interest, otherwise defaults or has its credit rating downgraded or is perceived to be less creditworthy, or the credit quality or value of any underlying assets declines. When market prices fall, the value of your investment will go down. The value of your investment will generally go down when interest rates rise. Interest rates have been at historically low levels, so the fund faces a heightened risk that interest rates may rise. A rise in rates tends to have a greater impact on the prices of longer term or duration securities.
  • Focused Investing – To the extent the fund invests in one or more countries, regions, sectors or industries, or in a limited number of issuers, the fund will be more susceptible to negative events affecting those countries, regions, sectors, industries or issuers. Local events, such as political upheaval, financial troubles, or natural disasters may disrupt a country's or region's securities markets. Geographic risk is especially high in emerging markets.
  • Foreign Investments – Investing in securities of foreign issuers or issuers with significant exposure to foreign markets involves additional risk. Foreign countries in which the fund may invest may have markets that are less liquid, less regulated and more volatile than U.S. markets. The value of the fund's investments may decline because of factors affecting the particular issuer as well as foreign markets and issuers generally, such as unfavorable government actions, political or financial instability or other adverse economic or political developments. Lack of information and weaker accounting standards also may affect the value of these securities.
  • High-Yield Debt Securities – High-yield debt securities, commonly referred to as "junk bonds," are securities that are rated below "investment grade" (that is, securities rated below Baa/BBB) or, if unrated, determined to be below investment grade by the sub-adviser. Changes in interest rates, the market's perception of the issuers and the creditworthiness of the issuers may significantly affect the value of these bonds. Junk bonds are considered speculative, have a higher risk of default, tend to be less liquid and may be more difficult to value than higher grade securities. Junk bonds tend to be volatile and more susceptible to adverse events and negative sentiments.
  • Industry Concentration – The fund concentrates its investments in a specific industry or industries. Concentration in a particular industry subjects the fund to the risks associated with that industry. As a result, the fund may be subject to greater price volatility and risk of loss as a result of adverse economic, business or other developments affecting that industry than funds investing in a broader range of industries.
  • Interest Rate – Interest rates in the U.S. have been at historically low levels, so the fund faces a heightened risk that interest rates may rise. The value of fixed income securities generally goes down when interest rates rise, and therefore the value of your investment in the fund may also go down. Debt securities have varying levels of sensitivity to changes in interest rates. A rise in rates tends to have a greater impact on the prices of longer term or duration securities.
  • Leveraging – The value of your investment may be more volatile to the extent that the fund borrows or uses derivatives or other investments that have a leveraging effect on the fund. Other risks also will be compounded. This is because leverage generally magnifies the effect of a change in the value of an asset and creates a risk of loss of value on a larger pool of assets than the fund would otherwise have had. The use of leverage is considered to be a speculative investment practice and may result in the loss of a substantial amount, and possibly all, of the fund's assets. The fund also may have to sell assets at inopportune times to satisfy its obligations.
  • Liquidity – The fund may make investments that are illiquid or that become illiquid after purchase. The liquidity and value of investments can deteriorate rapidly and those investments may be difficult or impossible to sell, particularly during times of market turmoil. These illiquid investments may also be difficult to value. If the fund is forced to sell an illiquid investment to meet redemption requests or other cash needs, the fund may be forced to sell at a loss.
  • Manager – The fund is subject to the risk that the sub-adviser's judgments and investment decisions, as well as the methods, tools, resources, information and data, and the analyses employed or relied on by the sub-adviser to make those judgments and decisions may be incorrect or otherwise may not produce the desired results. This could cause the fund to lose value or its results to lag relevant benchmarks or other funds with similar objectives.
  • Market – The market prices of the fund's securities may go up or down, sometimes rapidly or unpredictably, due to general market conditions, such as real or perceived adverse economic or political conditions, inflation, changes in interest rates or currency rates, lack of liquidity in the markets or adverse investor sentiment. Adverse market conditions may be prolonged and may not have the same impact on all types of securities. Market prices of securities also may go down due to events or conditions that affect particular sectors, industries or issuers. When market prices fall, the value of your investment will go down. The fund may experience a substantial or complete loss on any individual security. Financial markets in the U.S., Europe and elsewhere have experienced increased volatility and decreased liquidity since the global financial crisis began in 2008. Governmental and non-governmental issuers defaulted on, or were forced to restructure, their debts. These market conditions may continue, worsen or spread. The U.S. government and the Federal Reserve, as well as certain foreign governments and their central banks have taken steps to support financial markets, including keeping interest rates at historically low levels. More recently, the Federal Reserve has reduced its market support activities. Further reduction or withdrawal of this support, or other related efforts in response to the crisis could negatively affect financial markets generally and increase market volatility as well as result in higher interest rates and reduce the value and liquidity of certain securities. This environment could make identifying investment risks and opportunities especially difficult for the sub-adviser. Whether or not the fund invests in securities of issuers located in or with significant exposure to countries experiencing economic and financial difficulties, the value and liquidity of the fund's investments may be negatively affected. In addition, policy and legislative changes in the United States and in other countries are affecting many aspects of financial regulation, and in some instances may contribute to decreased liquidity and increased volatility in the financial markets.
  • Mortgage-Related and Asset-Backed Securities– The value of mortgage-related and asset-backed securities will be influenced by factors affecting the housing market and the assets underlying such securities. As a result, during periods of declining asset values, difficult or frozen credit markets, swings in interest rates, or deteriorating economic conditions, mortgage-related and asset-backed securities may decline in value, face valuation difficulties, become more volatile and/or become illiquid. Mortgage-backed securities may be issued by private issuers, by government-sponsored entities such as Fannie Mae or Freddie Mac or by agencies of the U.S. government, such as Ginnie Mae. Mortgage-backed securities represent direct or indirect participations in, or are collateralized by and payable from, mortgage loans secured by real property. Unlike mortgage-related securities issued or guaranteed by agencies of the U.S. government or government-sponsored entities, mortgage-related securities issued by private issuers do not have a government or government-sponsored entity guarantee (but may have other credit enhancement), and may, and frequently do, have less favorable collateral, credit risk or other underwriting characteristics. Asset-backed securities represent participations in, or are secured by and payable from, assets such as installment sales or loan contracts, leases, credit card receivables and other categories of receivables. The value of mortgage-backed and asset-backed securities may be affected by changes in credit quality or value of the mortgage loans or other assets that support the securities. Mortgage-backed and asset-backed securities are subject to prepayment or call and extension risks. Some of these securities may receive little or no collateral protection from the underlying assets. The risk of default is generally higher in the case of mortgage-backed investments that include so-called "sub-prime" mortgages. The structure of some of these securities may be complex and there may be less information available than for other types of debt securities. Upon the occurrence of certain triggering events or defaults, the fund may become the holder of underlying assets at a time when those assets may be difficult to sell or may be sold only at a loss.
  • Municipal Securities – Municipal issuers may be adversely affected by rising health care costs, increasing unfunded pension liabilities, and by the phasing out of federal programs providing financial support. Unfavorable conditions and developments relating to projects financed with municipal securities can result in lower revenues to issuers of municipal securities, potentially resulting in defaults. The value of municipal securities can also be adversely affected by changes in the financial condition of one or more individual municipal issuers or insurers of municipal issuers, regulatory and political developments, tax law changes or other legislative actions, and by uncertainties and public perceptions concerning these and other factors. To the extent the fund invests significantly in a single state or in securities the payments on which are dependent upon a single project or source of revenues, or that relate to a sector or industry, the fund will be more susceptible to associated risks and developments. In recent periods an increasing number of municipal issuers have defaulted on obligations, commenced insolvency proceedings, or suffered credit downgrading. Financial difficulties of municipal issuers may continue or get worse.
  • Non-Diversification – The fund is classified as "non-diversified," which means it may invest a larger percentage of its assets in a smaller number of issuers than a diversified fund. To the extent the fund invests its assets in a smaller number of issuers, the fund will be more susceptible to negative events affecting those issuers than a diversified fund.
  • Portfolio Selection – The value of your investment may decrease if the sub-adviser's judgment about the quality, relative yield, value or market trends affecting a particular security or issuer, industry, sector, region or market segment, or about the economy or interest rates is incorrect.
  • Precious Metals-Related Securities – Investments in precious metals-related securities are considered speculative and are affected by a variety of worldwide economic, financial and political factors. Prices of precious metals and of precious metals-related securities historically have been very volatile. The high volatility of precious metals prices may adversely affect the financial condition of companies involved with precious metals. The production and sale of precious metals by governments or central banks or other larger holders can be affected by various economic, financial, social and political factors, which may be unpredictable and may have a significant impact on the prices of precious metals. Other factors that may affect the prices of precious metals and securities related to them include changes in inflation, the outlook for inflation and changes in industrial and commercial demand for precious metals.
  • Prepayment or Call – Many issuers have a right to prepay their securities. If interest rates fall, an issuer may exercise this right. If this happens, the fund will not benefit from the rise in market price that normally accompanies a decline in interest rates, and will be forced to reinvest prepayment proceeds at a time when yields on securities available in the market are lower than the yield on the prepaid security. The fund also may lose any premium it paid on the security.
  • Structured Instruments – The fund may invest in, or have exposure to, various types of structured instruments, including securities that have demand, tender or put features, or interest rate reset features. Structured instruments are a type of derivative instrument and the payment and credit qualities of these instruments derive from the assets embedded in the structure from which they are issued. Structured instruments may behave in ways not anticipated by the fund, or they may not receive tax, accounting or regulatory treatment anticipated by the fund.
  • Subsidiary – By investing in the Subsidiary, the fund will be indirectly exposed to the risks associated with the Subsidiary's investments. The derivatives and other investments that will be held by the Subsidiary are generally similar to those that are permitted to be held by the fund and will be subject to the same risks that apply to similar investments if held directly by the fund. There can be no assurance that the investment objective of the Subsidiary will be achieved. The Subsidiary is not registered under the Investment Company Act, and, unless otherwise noted in this prospectus, is not subject to the investor protections of the Investment Company Act. The fund relies on a private letter ruling from the Internal Revenue Service (the "IRS") with respect to the investment in the Subsidiary. Changes in the laws of the United States and/or the Cayman Islands could result in the inability of the fund and/or the Subsidiary to operate as described in this prospectus and the SAI and could adversely affect the fund.
  • Tax – The fund may seek to gain exposure to the commodity markets primarily through investments in commodity-linked notes and through investments in the Subsidiary. The tax treatment of commodity-linked notes, other commodity-linked derivatives and the fund's investments in the Subsidiary may be adversely affected by future legislation, Treasury Regulations and/or guidance issued by the IRS that could, among other things, affect the character, timing and/or amount of the fund's taxable income or gains and of distributions made by the fund.
  • U.S. Government Agency Obligations – Government agency obligations have different levels of credit support and, therefore, different degrees of credit risk. Securities issued by agencies and instrumentalities of the U.S. government that are supported by the full faith and credit of the U.S. generally present a lesser degree of credit risk than securities issued by agencies and instrumentalities sponsored by the U.S. government that are supported only by the issuer's right to borrow from the U.S. Treasury and securities issued by agencies and instrumentalities sponsored by the U.S. government that are supported only by the credit of the issuing agencies. Although the U.S. government has provided financial support to the Federal National Mortgage Association ("Fannie Mae") and the Federal Home Loan Mortgage Corporation ("Freddie Mac") in the past, there can be no assurance that it will support these or other government sponsored entities in the future.
  • Valuation – The sales price the fund could receive for any particular portfolio investment may differ from the fund's valuation of the investment, particularly for securities that trade in thin or volatile markets, that are priced based upon valuations provided by third-party pricing services that use matrix or evaluated pricing systems, or that are valued using a fair value methodology.
Risk Lose Money [Text] rr_RiskLoseMoney You may lose money if you invest in this fund.
Risk Nondiversified Status [Text] rr_RiskNondiversifiedStatus
  • Non-Diversification – The fund is classified as "non-diversified," which means it may invest a larger percentage of its assets in a smaller number of issuers than a diversified fund. To the extent the fund invests its assets in a smaller number of issuers, the fund will be more susceptible to negative events affecting those issuers than a diversified fund.
Bar Chart and Performance Table [Heading] rr_BarChartAndPerformanceTableHeading Performance:
Performance Narrative [Text Block] rr_PerformanceNarrativeTextBlock The bar chart and the table below provide some indication of the risks of investing in the fund. The bar chart shows how the fund’s performance has varied from year to year. The table shows how the fund’s average annual total returns for different periods compare to the returns of a broad measure of market performance.Absent any limitation of the fund’s expenses, total returns would be lower. Index returns are since the inception of the oldest share class.

As with all mutual funds, past performance (before and after taxes) is not a prediction of future results. Updated performance information is available on our website at www.transamerica.com/individual/products/mutual-funds/performance/index.html or by calling 1-888-233-4339.

Prior to September 30, 2010, the fund was named Transamerica BlackRock Natural Resources, had a different sub-adviser, a different investment objective and used different investment strategies. The performance set forth prior to that date is attributable to a previous sub-adviser.
Performance Information Illustrates Variability of Returns [Text] rr_PerformanceInformationIllustratesVariabilityOfReturns The bar chart and the table below provide some indication of the risks of investing in the fund. The bar chart shows how the fund’s performance has varied from year to year. The table shows how the fund’s average annual total returns for different periods compare to the returns of a broad measure of market performance.
Performance Availability Phone [Text] rr_PerformanceAvailabilityPhone 1-888-233-4339
Performance Availability Website Address [Text] rr_PerformanceAvailabilityWebSiteAddress www.transamerica.com/individual/products/mutual-funds/performance/index.html
Performance Past Does Not Indicate Future [Text] rr_PerformancePastDoesNotIndicateFuture As with all mutual funds, past performance (before and after taxes) is not a prediction of future results.
Bar Chart [Heading] rr_BarChartHeading Annual Total Returns (calendar years ended December 31) - Class I2
Bar Chart Closing [Text Block] rr_BarChartClosingTextBlock
 Quarter EndedReturn
Best Quarter:06/30/200922.13%
Worst Quarter:12/31/2008-34.42%
Performance Table Heading rr_PerformanceTableHeading Average Annual Total Returns (periods ended December 31, 2014)
Performance Table Uses Highest Federal Rate rr_PerformanceTableUsesHighestFederalRate The after-tax returns are calculated using the historic 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 may depend on the investor’s individual tax situation and may differ from those shown. After-tax returns may not be relevant if the investment is made through a tax-exempt or tax-deferred account, such as a 401(k) plan.
Performance Table Narrative rr_PerformanceTableNarrativeTextBlock The after-tax returns are calculated using the historic highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. Actual after-tax returns may depend on the investor’s individual tax situation and may differ from those shown. After-tax returns may not be relevant if the investment is made through a tax-exempt or tax-deferred account, such as a 401(k) plan.
Transamerica Commodity Strategy | I2  
Risk/Return: rr_RiskReturnAbstract  
Maximum sales charge (load) imposed on purchases (as a percentage of offering price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum deferred sales charge (load) (as a percentage of purchase price or redemption proceeds, whichever is lower) rr_MaximumDeferredSalesChargeOverOther none
Management fees rr_ManagementFeesOverAssets 0.72%rr_ManagementFeesOverAssets
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Distribution and service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets none
Other expenses rr_OtherExpensesOverAssets 0.14%rr_OtherExpensesOverAssets
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Total annual fund operating expenses rr_ExpensesOverAssets 0.86%rr_ExpensesOverAssets
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Fee waiver and/or expense reimbursement rr_FeeWaiverOrReimbursementOverAssets 0.11%rr_FeeWaiverOrReimbursementOverAssets
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[1]
Total annual fund operating expenses after fee waiver and/or expense reimbursement rr_NetExpensesOverAssets 0.75%rr_NetExpensesOverAssets
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1 year rr_ExpenseExampleYear01 77rr_ExpenseExampleYear01
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3 years rr_ExpenseExampleYear03 263rr_ExpenseExampleYear03
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5 years rr_ExpenseExampleYear05 466rr_ExpenseExampleYear05
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10 years rr_ExpenseExampleYear10 1,051rr_ExpenseExampleYear10
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2008 rr_AnnualReturn2008 (48.47%)rr_AnnualReturn2008
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2009 rr_AnnualReturn2009 51.01%rr_AnnualReturn2009
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2010 rr_AnnualReturn2010 15.88%rr_AnnualReturn2010
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2011 rr_AnnualReturn2011 (10.16%)rr_AnnualReturn2011
/ dei_LegalEntityAxis
= tf_S000015034Member
/ rr_ProspectusShareClassAxis
= tf_C000040882Member
2012 rr_AnnualReturn2012 (2.67%)rr_AnnualReturn2012
/ dei_LegalEntityAxis
= tf_S000015034Member
/ rr_ProspectusShareClassAxis
= tf_C000040882Member
2013 rr_AnnualReturn2013 (10.35%)rr_AnnualReturn2013
/ dei_LegalEntityAxis
= tf_S000015034Member
/ rr_ProspectusShareClassAxis
= tf_C000040882Member
2014 rr_AnnualReturn2014 (16.37%)rr_AnnualReturn2014
/ dei_LegalEntityAxis
= tf_S000015034Member
/ rr_ProspectusShareClassAxis
= tf_C000040882Member
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel Best Quarter:
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Jun. 30, 2009
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 22.13%rr_BarChartHighestQuarterlyReturn
/ dei_LegalEntityAxis
= tf_S000015034Member
/ rr_ProspectusShareClassAxis
= tf_C000040882Member
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel Worst Quarter:
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Dec. 31, 2008
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (34.42%)rr_BarChartLowestQuarterlyReturn
/ dei_LegalEntityAxis
= tf_S000015034Member
/ rr_ProspectusShareClassAxis
= tf_C000040882Member
1 Year rr_AverageAnnualReturnYear01 (16.37%)rr_AverageAnnualReturnYear01
/ dei_LegalEntityAxis
= tf_S000015034Member
/ rr_ProspectusShareClassAxis
= tf_C000040882Member
5 Years rr_AverageAnnualReturnYear05 (5.35%)rr_AverageAnnualReturnYear05
/ dei_LegalEntityAxis
= tf_S000015034Member
/ rr_ProspectusShareClassAxis
= tf_C000040882Member
Since Inception rr_AverageAnnualReturnSinceInception (2.30%)rr_AverageAnnualReturnSinceInception
/ dei_LegalEntityAxis
= tf_S000015034Member
/ rr_ProspectusShareClassAxis
= tf_C000040882Member
Inception Date rr_AverageAnnualReturnInceptionDate Jan. 03, 2007
Transamerica Commodity Strategy | Return after taxes on distributions | I2  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 (16.37%)rr_AverageAnnualReturnYear01
/ dei_LegalEntityAxis
= tf_S000015034Member
/ rr_PerformanceMeasureAxis
= rr_AfterTaxesOnDistributionsMember
/ rr_ProspectusShareClassAxis
= tf_C000040882Member
5 Years rr_AverageAnnualReturnYear05 (6.02%)rr_AverageAnnualReturnYear05
/ dei_LegalEntityAxis
= tf_S000015034Member
/ rr_PerformanceMeasureAxis
= rr_AfterTaxesOnDistributionsMember
/ rr_ProspectusShareClassAxis
= tf_C000040882Member
Since Inception rr_AverageAnnualReturnSinceInception (2.81%)rr_AverageAnnualReturnSinceInception
/ dei_LegalEntityAxis
= tf_S000015034Member
/ rr_PerformanceMeasureAxis
= rr_AfterTaxesOnDistributionsMember
/ rr_ProspectusShareClassAxis
= tf_C000040882Member
Inception Date rr_AverageAnnualReturnInceptionDate Jan. 03, 2007
Transamerica Commodity Strategy | Return after taxes on distributions and sale of fund shares | I2  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 (9.27%)rr_AverageAnnualReturnYear01
/ dei_LegalEntityAxis
= tf_S000015034Member
/ rr_PerformanceMeasureAxis
= rr_AfterTaxesOnDistributionsAndSalesMember
/ rr_ProspectusShareClassAxis
= tf_C000040882Member
5 Years rr_AverageAnnualReturnYear05 (3.88%)rr_AverageAnnualReturnYear05
/ dei_LegalEntityAxis
= tf_S000015034Member
/ rr_PerformanceMeasureAxis
= rr_AfterTaxesOnDistributionsAndSalesMember
/ rr_ProspectusShareClassAxis
= tf_C000040882Member
Since Inception rr_AverageAnnualReturnSinceInception (1.66%)rr_AverageAnnualReturnSinceInception
/ dei_LegalEntityAxis
= tf_S000015034Member
/ rr_PerformanceMeasureAxis
= rr_AfterTaxesOnDistributionsAndSalesMember
/ rr_ProspectusShareClassAxis
= tf_C000040882Member
Inception Date rr_AverageAnnualReturnInceptionDate Jan. 03, 2007
Transamerica Commodity Strategy | Bloomberg Commodity Index Total Return (reflects no deduction for fees, expenses or taxes)  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 (17.01%)rr_AverageAnnualReturnYear01
/ dei_LegalEntityAxis
= tf_S000015034Member
/ rr_PerformanceMeasureAxis
= tf_BloombergCommodityIndexTotalReturnMember
5 Years rr_AverageAnnualReturnYear05 (5.53%)rr_AverageAnnualReturnYear05
/ dei_LegalEntityAxis
= tf_S000015034Member
/ rr_PerformanceMeasureAxis
= tf_BloombergCommodityIndexTotalReturnMember
Since Inception rr_AverageAnnualReturnSinceInception (4.90%)rr_AverageAnnualReturnSinceInception
/ dei_LegalEntityAxis
= tf_S000015034Member
/ rr_PerformanceMeasureAxis
= tf_BloombergCommodityIndexTotalReturnMember
[1] Management fees include the management fees borne by the fund as the sole shareholder of the Subsidiary (defined below). Transamerica Asset Management, Inc. ("TAM") has contractually agreed to waive a portion of the fund's management fee in an amount equal to the management fee paid to TAM by the Subsidiary. The Subsidiary has entered into a separate contract with the fund's investment adviser, TAM, for the management of the Subsidiary portfolio pursuant to which the Subsidiary pays TAM a fee that is the same, as a percentage of net assets, as the management fee of the fund. This management fee waiver, which is reflected in the "fee waiver and/or expense reimbursement" line, may not be discontinued by TAM as long as its contract with the Subsidiary is in place.