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A Fund also may identify its type or category (e.g., that it is a Money Market Fund or a balanced fund).Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 2 -Subsection a falsefalseObjective, Primary [Text Block]6false0rr_ExpenseHeadingrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<i>Fees and Expenses of the Balanced Fund:</i>falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringRisk/Return Summary Fee Table Includes the following information, in plain English under rule 421(d) under the Securities Act, after Item 2 Fees and expenses of the Fund This table describes the fees and expenses that you may pay if you buy and hold shared of the Fund. You may qualify for sales charge discounts if you and your family invest, or agree to invest in the future, at least $[_____] in [name of fund family] funds. Shareholder Fees (fees paid directly from your investment) Example 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 you redeem all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return per year and that the Fund's operating expenses remained the same. Although your actual costs may be higher or lower, based on these assumptions your costs would be You would pay the following expenses if you did not redeem your shares The Example does not reflect sales charges (loads) on reinvested dividends [and other distributions]. If these sales charges (loads) were included, your costs would be higher. Portfolio Turnover The Fund pays transaction costs, such as commissions, when it buys and sells securities (or "turns over" its portfolio). A higher portfolio turnover may indicate higher transaction costs. 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 __% of the average value of its whole portfolio. Instructions. A.3.instructions.6 New Funds. For purposes of this Item, a "New Fund" is a Fund that does not include in Form N-1A financial statements reporting operating results or that includes financial statements for the Fund's initial fiscal year reporting operating results for a period of 6 months or less. The following Instructions apply to New Funds.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 1 -Subparagraph d -Subsection instructions falsefalseExpense [Heading]7false0rr_ExpenseNarrativeTextBlockrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00This table describes the fees and expenses that you may pay if you buy and hold shares of the Balanced Fund. You may qualify for sales charge discounts if you or your family invest, or agree to invest in the future, at least $100,000 in a Fund&#8217;s Class A Shares. More information about these and other discounts is available from your financial professional and in the &#8220;Classes of Shares&#8221; section on page 42 of the Fund&#8217;s Prospectus and in &#8220;Purchase and Redemption of Shares&#8221; on page 51 of the Fund&#8217;s SAI.falsefalsefalsefalsefalseOtherus-types:textBlockItemTypestringThis table describes the fees and expenses that you may pay if you buy and hold shared of the Fund. You may qualify for sales charge discounts if you and your family invest, or agree to invest in the future, at least $[_____] in [name of fund family] funds. Include the narrative explanations in the order indicated. A Fund may modify the narrative explanations if the explanation contains comparable information to that shown.The narrative explanation regarding sales charge discounts is only required by a Fund that offers such discounts and should specify the minimum level of investment required to qualify for a discount. 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A Fund may include in a footnote to the table, if applicable, a tabular presentation showing the amount of deferred sales charges (loads) over time or a narrative explanation of the sales charges (loads) (e.g., __% in the first year after purchase, declining to __% in the __ year and eliminated thereafter). A.3.instructions.2.a.ii If more than one type of sales charge (load) is imposed (e.g., a deferred sales charge (load) and a front-end sales charge (load)), the first caption in the table should read "Maximum Sales Charge (Load)" and show the maximum cumulative percentage. 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Under an appropriate caption or a subcaption of "Other Expenses," disclose the amount of any distribution or similar expenses deducted from the Fund's assets other than pursuant to a rule 12b-1 plan.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 1 -Subparagraph 9 -Subsection table falsefalseDistribution and Service (Rule 12b-1) Expenses0rr_DistributionAndService12b1FeesOverAssetstruefalsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue0.00500.0050falsefalsefalsetruefalse2truetruetrue0.01000.0100falsefalsefalsetruefalse3truetruetrue0.01000.0100falsefalsefalsetruefalse4truetruetrue0.00000.0000falsefalsefalsetruefalseOthernanafalsefalseDistribution and Service (Rule 12b-1) Expenses4falseRowprimaryElement*7false0rr_OtherExpensesOverAssetsrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalsetotallabel1truetruetrue0.00240.0024falsefalsefalsetruefalse2truetruetrue0.00240.0024falsefalsefalsetruefalse3truetruetrue0.00240.0024falsefalsefalsetruefalse4truetruetrue0.00240.0024falsefalsefalsetruefalseOtherrr:NonNegativePure4Typepure"Other Expenses" include all expenses not otherwise disclosed in the table that are deducted from the Fund's assets or charged to all shareholder accounts. The amount of expenses deducted from the Fund's assets are the amounts shown as expenses in the Fund's statement of operations (including increases resulting from complying with paragraph 2(g) of rule 6-07 of Regulation S-X [17 CFR 210.6-07]). "Other Expenses" do not include extraordinary expenses as determined under generally accepted accounting principles (see Accounting Principles Board Opinion No. 30). If extraordinary expenses were incurred that materially affected the Fund's "Other Expenses," disclose in a footnote to the table what "Other Expenses" would have been had the extraordinary expenses been included.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 3 -Subparagraph c -Clause i -Subsection instructions truefalseOther Expenses0rr_OtherExpensesOverAssetstruefalsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue0.00240.0024falsefalsefalsetruefalse2truetruetrue0.00240.0024falsefalsefalsetruefalse3truetruetrue0.00240.0024falsefalsefalsetruefalse4truetruetrue0.00240.0024falsefalsefalsetruefalseOthernanafalsefalseOther Expenses5falseRowprimaryElement*8false0rr_ExpensesOverAssetsrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalsetotallabel1truetruetrue0.01490.0149falsefalsefalsetruefalse2truetruetrue0.01990.0199falsefalsefalsetruefalse3truetruetrue0.01990.0199falsefalsefalsetruefalse4truetruetrue0.00990.0099falsefalsefalsetruefalseOtherrr:NonNegativePure4TypepureTotal Annual Fund Operating Expenses. If the Fund is a Feeder Fund, reflect the aggregate expenses of the Feeder Fund and the Master Fund in a single fee table using the captions provided. In a footnote to the fee table, state that the table and Example reflect the expenses of both the Feeder and Master Funds. If the prospectus offers more than one Class of a Multiple Class Fund or more than one Feeder Fund that invests in the same Master Fund, provide a separate response for each Class or Feeder Fund. Base the percentages of "Annual Fund Operating Expenses" on amounts incurred during the Fund's most recent fiscal year, but include in expenses amounts that would have been incurred absent expense reimbursement or fee waiver arrangements. If the Fund has changed its fiscal year and, as a result, the most recent fiscal year is less than three months, use the fiscal year prior to the most recent fiscal year as the basis for determining "Annual Fund Operating Expenses."Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 3 -Subparagraph d -Subsection instructions truefalseTotal Annual Fund Operating Expenses0rr_ExpensesOverAssetstruefalsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue0.01490.0149falsefalsefalsetruefalse2truetruetrue0.01990.0199falsefalsefalsetruefalse3truetruetrue0.01990.0199falsefalsefalsetruefalse4truetruetrue0.00990.0099falsefalsefalsetruefalseOthernanafalsefalseTotal Annual Fund Operating Expenses45Annual Fund Operating Expenses - Gamco Westwood Balanced Fund (Class A, B, C and I) GAMCO Westwood Balanced Fund [Member] Prospectus, Class A, B, C and I Shares [Member]UnKnownUnKnownUnKnownUnKnownfalsetrueColumnperiodPeriod*Columndei_DocumentInformationDocumentAxisAxis*Columndei_LegalEntityAxisAxis*Columnrr_ProspectusShareClassAxisAxis*ColumnunitUnit*RowprimaryElement*falsefalsefalseOtherus-types:textBlockItemTypestringContains a command for the SEC Viewer for the role corresponding to OperatingExpensesData.No authoritative reference available.falsefalseAnnual Fund Operating Expenses [Table]12false0rr_ExpenseExampleHeadingrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<i>Expense Example</i>falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringHeading for Expense Example.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 4 -Subsection instructions falsefalseExpense Example [Heading]13false0rr_ExpenseExampleNarrativeTextBlockrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<p>This example is intended to help you compare the cost of investing in the Balanced Fund with the cost of investing in other mutual funds.</p><p>The example assumes that you invest $10,000 in the Balanced Fund for the time periods indicated and then redeem all of your shares at the end of those periods, except as noted. The example also assumes that your investment has a 5% return each year and that the Balanced Fund&#8217;s operating expenses remain the same. Although your actual costs may be higher or lower, based on these assumptions your costs would be:</p>falsefalsefalsefalsefalseOtherus-types:textBlockItemTypestringThe Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 1 -Subparagraph 1 -Subsection example falsefalseExpense Example Narrative [Text Block]14false0rr_ExpenseExampleWithRedemptionTableTextBlockrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<div> &lt;div style="display:none;" &gt;~ http://gabelli.com/role/ExpenseExampleGamcoWestwoodBalancedFundClassBCAndI column period compact * column rr_ProspectusShareClassAxis compact * row primary compact * column dei_LegalEntityAxis compact webax_S000001080_Member * row rr_DocumentInformationDocumentAxis compact webax_Prospectus_Two_Member * ~&lt;/div&gt; </div>falsefalse<div> &lt;div style="display:none;" &gt;~ http://gabelli.com/role/ExpenseExampleGamcoWestwoodBalancedFundClassBCAndI column period compact * column rr_ProspectusShareClassAxis compact * row primary compact * column dei_LegalEntityAxis compact webax_S000001080_Member * row rr_DocumentInformationDocumentAxis compact webax_Prospectus_Two_Member * ~&lt;/div&gt; </div>truehttp://gabelli.com/role/ExpenseExampleGamcoWestwoodBalancedFundClassBCAndIfalsefalse0200310 - Schedule - Expense Example - Gamco Westwood Balanced Fund (Class A, B, C and I) {Transposed}truefalsefalse1falseColumnprimaryElement*4false0rr_ExpenseExampleByYearColumnNamerrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00Class A Sharesfalsefalsefalsetruefalse2falsefalsefalse00Class B Sharesfalsefalsefalsetruefalse3falsefalsefalse00Class C Sharesfalsefalsefalsetruefalse4falsefalsefalse00Class I SharesfalsefalsefalsetruefalseOtherus-types:textBlockItemTypestringThe Example assumes that you invest $10,000 in the Fund for the time periods indicated and then you redeem all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return per year and that the Fund's operating expenses remained the same. Although your actual costs may be higher or lower.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 1 -Subparagraph 2 -Subsection example falsefalseExpense Example, By Year, Column [Text]falseUSDfalsefalse$2falseColumnprimaryElement*5false0rr_ExpenseExampleYear01rrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel1truefalsetrue546546falsefalsefalsetruefalse2truefalsetrue702702falsefalsefalsetruefalse3truefalsetrue302302falsefalsefalsetruefalse4truefalsetrue101101falsefalsefalsetruefalseMonetaryrr:NonNegativeMonetaryTypemonetaryThe Example assumes that you invest $10,000 in the Fund for the time periods indicated and then you redeem all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return per year and that the Fund's operating expenses remained the same. Although your actual costs may be higher or lower.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 4 -Subsection instructions falsefalse1 YearfalseUSDfalsefalse$3falseColumnprimaryElement*6false0rr_ExpenseExampleYear03rrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel1truefalsetrue852852falsefalsefalsetruefalse2truefalsetrue924924falsefalsefalsetruefalse3truefalsetrue624624falsefalsefalsetruefalse4truefalsetrue315315falsefalsefalsetruefalseMonetaryrr:NonNegativeMonetaryTypemonetaryThe Example assumes that you invest $10,000 in the Fund for the time periods indicated and then you redeem all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return per year and that the Fund's operating expenses remained the same. Although your actual costs may be higher or lower.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 1 -Subparagraph 2 -Subsection example falsefalse3 YearsfalseUSDfalsefalse$4falseColumnprimaryElement*7false0rr_ExpenseExampleYear05rrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel1truefalsetrue11811181falsefalsefalsetruefalse2truefalsetrue12731273falsefalsefalsetruefalse3truefalsetrue10731073falsefalsefalsetruefalse4truefalsetrue547547falsefalsefalsetruefalseMonetaryrr:NonNegativeMonetaryTypemonetaryThe Example assumes that you invest $10,000 in the Fund for the time periods indicated and then you redeem all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return per year and that the Fund's operating expenses remained the same. Although your actual costs may be higher or lower.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 1 -Subparagraph 2 -Subsection example falsefalse5 YearsfalseUSDfalsefalse$5falseColumnprimaryElement*8false0rr_ExpenseExampleYear10rrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel1truefalsetrue21082108falsefalsefalsetruefalse2truefalsetrue21882188falsefalsefalsetruefalse3truefalsetrue23172317falsefalsefalsetruefalse4truefalsetrue12131213falsefalsefalsetruefalseMonetaryrr:NonNegativeMonetaryTypemonetaryThe Example assumes that you invest $10,000 in the Fund for the time periods indicated and then you redeem all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return per year and that the Fund's operating expenses remained the same. Although your actual costs may be higher or lower.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 1 -Subparagraph 2 -Subsection example falsefalse10 YearsfalseUSDfalsefalse$1falseRowperiodPeriod*Rowdei_DocumentInformationDocumentAxisAxis*Rowdei_LegalEntityAxisAxis*Rowrr_ProspectusShareClassAxisAxis*RowunitUnit*duration2010-01-29T00:00:002011-01-31T00:00:00falsefalseGAMCO Westwood Balanced Fund [Member]dei_DocumentInformationDocumentAxisxbrldihttp://xbrl.org/2006/xbrldiwebax_S000001080Memberdei_DocumentInformationDocumentAxisexplicitMemberfalsefalseProspectus, Class A, B, C and I Shares [Member]dei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldiwebax_ProspectusTwoMemberdei_LegalEntityAxisexplicitMemberfalsefalseClass A, GAMCO Westwood Balanced Fund [Member]rr_ProspectusShareClassAxisxbrldihttp://xbrl.org/2006/xbrldiwebax_C000002911Memberrr_ProspectusShareClassAxisexplicitMemberGAMCO Westwood Balanced Fund [Member]Prospectus, Class A, B, C and I Shares [Member]Class A, GAMCO Westwood Balanced Fund [Member]USDStandardhttp://www.xbrl.org/2003/iso4217USDiso421700truefalsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00Class A SharesClass A Sharesfalsefalsefalsetruefalse2truefalsetrue546546falsefalsefalsetruefalse3truefalsetrue852852falsefalsefalsetruefalse4truefalsetrue11811181falsefalsefalsetruefalse5truefalsetrue21082108falsefalsefalsetruefalseOthernanafalsefalseClass A, GAMCO Westwood Balanced Fund [Member]2falseRowperiodPeriod*Rowdei_DocumentInformationDocumentAxisAxis*Rowdei_LegalEntityAxisAxis*Rowrr_ProspectusShareClassAxisAxis*RowunitUnit*duration2010-01-29T00:00:002011-01-31T00:00:00falsefalseGAMCO Westwood Balanced Fund [Member]dei_DocumentInformationDocumentAxisxbrldihttp://xbrl.org/2006/xbrldiwebax_S000001080Memberdei_DocumentInformationDocumentAxisexplicitMemberfalsefalseProspectus, Class A, B, C and I Shares [Member]dei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldiwebax_ProspectusTwoMemberdei_LegalEntityAxisexplicitMemberfalsefalseClass B, GAMCO Westwood Balanced Fund [Member]rr_ProspectusShareClassAxisxbrldihttp://xbrl.org/2006/xbrldiwebax_C000002913Memberrr_ProspectusShareClassAxisexplicitMemberGAMCO Westwood Balanced Fund [Member]Prospectus, Class A, B, C and I Shares [Member]Class B, GAMCO Westwood Balanced Fund [Member]USDStandardhttp://www.xbrl.org/2003/iso4217USDiso421700truefalsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00Class B SharesClass B Sharesfalsefalsefalsetruefalse2truefalsetrue702702falsefalsefalsetruefalse3truefalsetrue924924falsefalsefalsetruefalse4truefalsetrue12731273falsefalsefalsetruefalse5truefalsetrue21882188falsefalsefalsetruefalseOthernanafalsefalseClass B, GAMCO Westwood Balanced Fund [Member]3falseRowperiodPeriod*Rowdei_DocumentInformationDocumentAxisAxis*Rowdei_LegalEntityAxisAxis*Rowrr_ProspectusShareClassAxisAxis*RowunitUnit*duration2010-01-29T00:00:002011-01-31T00:00:00falsefalseGAMCO Westwood Balanced Fund [Member]dei_DocumentInformationDocumentAxisxbrldihttp://xbrl.org/2006/xbrldiwebax_S000001080Memberdei_DocumentInformationDocumentAxisexplicitMemberfalsefalseProspectus, Class A, B, C and I Shares [Member]dei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldiwebax_ProspectusTwoMemberdei_LegalEntityAxisexplicitMemberfalsefalseClass C, GAMCO Westwood Balanced Fund [Member]rr_ProspectusShareClassAxisxbrldihttp://xbrl.org/2006/xbrldiwebax_C000002914Memberrr_ProspectusShareClassAxisexplicitMemberGAMCO Westwood Balanced Fund [Member]Prospectus, Class A, B, C and I Shares [Member]Class C, GAMCO Westwood Balanced Fund [Member]USDStandardhttp://www.xbrl.org/2003/iso4217USDiso421700truefalsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00Class C SharesClass C Sharesfalsefalsefalsetruefalse2truefalsetrue302302falsefalsefalsetruefalse3truefalsetrue624624falsefalsefalsetruefalse4truefalsetrue10731073falsefalsefalsetruefalse5truefalsetrue23172317falsefalsefalsetruefalseOthernanafalsefalseClass C, GAMCO Westwood Balanced Fund [Member]4falseRowperiodPeriod*Rowdei_DocumentInformationDocumentAxisAxis*Rowdei_LegalEntityAxisAxis*Rowrr_ProspectusShareClassAxisAxis*RowunitUnit*duration2010-01-29T00:00:002011-01-31T00:00:00falsefalseGAMCO Westwood Balanced Fund [Member]dei_DocumentInformationDocumentAxisxbrldihttp://xbrl.org/2006/xbrldiwebax_S000001080Memberdei_DocumentInformationDocumentAxisexplicitMemberfalsefalseProspectus, Class A, B, C and I Shares [Member]dei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldiwebax_ProspectusTwoMemberdei_LegalEntityAxisexplicitMemberfalsefalseClass I, GAMCO Westwood Balanced Fund [Member]rr_ProspectusShareClassAxisxbrldihttp://xbrl.org/2006/xbrldiwebax_C000061063Memberrr_ProspectusShareClassAxisexplicitMemberGAMCO Westwood Balanced Fund [Member]Prospectus, Class A, B, C and I Shares [Member]Class I, GAMCO Westwood Balanced Fund [Member]USDStandardhttp://www.xbrl.org/2003/iso4217USDiso421700truefalsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00Class I SharesClass I Sharesfalsefalsefalsetruefalse2truefalsetrue101101falsefalsefalsetruefalse3truefalsetrue315315falsefalsefalsetruefalse4truefalsetrue547547falsefalsefalsetruefalse5truefalsetrue12131213falsefalsefalsetruefalseOthernanafalsefalseClass I, GAMCO Westwood Balanced Fund [Member]54Expense Example - Gamco Westwood Balanced Fund (Class A, B, C and I) GAMCO Westwood Balanced Fund [Member] Prospectus, Class A, B, C and I Shares [Member] (USD $)UnKnownUnKnownUnKnownUnKnownfalsetrueColumnprimaryElement*RowperiodPeriod*Rowdei_DocumentInformationDocumentAxisAxis*Rowdei_LegalEntityAxisAxis*Rowrr_ProspectusShareClassAxisAxis*RowunitUnit*falsefalsefalseOtherus-types:textBlockItemTypestringContains a command for the SEC Viewer for the role corresponding to ExpenseExample.No authoritative reference available.falsefalseExpense Example, With Redemption [Table]15false0rr_ExpenseExampleNoRedemptionNarrativeTextBlockrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00You would pay the following expenses if you did not redeem your shares of the Balanced Fund:falsefalsefalsefalsefalseOtherus-types:textBlockItemTypestringContains a command for the SEC Viewer for the role corresponding to ExpenseExampleNoRedemption.No authoritative reference available.falsefalseExpense Example, No Redemption Narrative [Text Block]16false0rr_ExpenseExampleNoRedemptionTableTextBlockrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<div> &lt;div style="display:none;" &gt;~ http://gabelli.com/role/ExpenseExampleNoRedemptionGamcoWestwoodBalancedFundClassBCAndI column period compact * column rr_ProspectusShareClassAxis compact * row primary compact * column dei_LegalEntityAxis compact webax_S000001080_Member * row rr_DocumentInformationDocumentAxis compact webax_Prospectus_Two_Member * ~&lt;/div&gt; </div>falsefalse<div> &lt;div style="display:none;" &gt;~ http://gabelli.com/role/ExpenseExampleNoRedemptionGamcoWestwoodBalancedFundClassBCAndI column period compact * column rr_ProspectusShareClassAxis compact * row primary compact * column dei_LegalEntityAxis compact webax_S000001080_Member * row rr_DocumentInformationDocumentAxis compact webax_Prospectus_Two_Member * ~&lt;/div&gt; </div>truehttp://gabelli.com/role/ExpenseExampleNoRedemptionGamcoWestwoodBalancedFundClassBCAndIfalsefalse0200407 - Schedule - Expense Example No Redemption - Gamco Westwood Balanced Fund (Class A, B, C and I) {Transposed}truefalsefalse1falseColumnprimaryElement*4false0rr_ExpenseExampleNoRedemptionByYearColumnNamerrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00Class A Sharesfalsefalsefalsetruefalse2falsefalsefalse00Class B Sharesfalsefalsefalsetruefalse3falsefalsefalse00Class C Sharesfalsefalsefalsetruefalse4falsefalsefalse00Class I SharesfalsefalsefalsetruefalseOtherus-types:textBlockItemTypestringYou would pay the following expenses if you did not redeem your shares.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 2 -Subparagraph 1 -Subsection example falsefalseExpense Example, No Redemption, By Year, Column [Text]falseUSDfalsefalse$2falseColumnprimaryElement*5false0rr_ExpenseExampleNoRedemptionYear01rrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel1truefalsetrue546546falsefalsefalsetruefalse2truefalsetrue202202falsefalsefalsetruefalse3truefalsetrue202202falsefalsefalsetruefalse4truefalsetrue101101falsefalsefalsetruefalseMonetaryrr:NonNegativeMonetaryTypemonetaryYou would pay the following expenses if you did not redeem your shares. Include the second 1-, 3-, 5-, and 10-year periods and related narrative explanation only if a sales charge (load) or other fee is charged upon redemption.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 2 -Subparagraph 1 -Subsection example falsefalse1 YearfalseUSDfalsefalse$3falseColumnprimaryElement*6false0rr_ExpenseExampleNoRedemptionYear03rrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel1truefalsetrue852852falsefalsefalsetruefalse2truefalsetrue624624falsefalsefalsetruefalse3truefalsetrue624624falsefalsefalsetruefalse4truefalsetrue315315falsefalsefalsetruefalseMonetaryrr:NonNegativeMonetaryTypemonetaryYou would pay the following expenses if you did not redeem your shares. Include the second 1-, 3-, 5-, and 10-year periods and related narrative explanation only if a sales charge (load) or other fee is charged upon redemption.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 2 -Subparagraph 1 -Subsection example falsefalse3 YearsfalseUSDfalsefalse$4falseColumnprimaryElement*7false0rr_ExpenseExampleNoRedemptionYear05rrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel1truefalsetrue11811181falsefalsefalsetruefalse2truefalsetrue10731073falsefalsefalsetruefalse3truefalsetrue10731073falsefalsefalsetruefalse4truefalsetrue547547falsefalsefalsetruefalseMonetaryrr:NonNegativeMonetaryTypemonetaryYou would pay the following expenses if you did not redeem your shares. Include the second 1-, 3-, 5-, and 10-year periods and related narrative explanation only if a sales charge (load) or other fee is charged upon redemption.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 4 -Subparagraph f -Subsection instructions falsefalse5 YearsfalseUSDfalsefalse$5falseColumnprimaryElement*8false0rr_ExpenseExampleNoRedemptionYear10rrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel1truefalsetrue21082108falsefalsefalsetruefalse2truefalsetrue21882188falsefalsefalsetruefalse3truefalsetrue23172317falsefalsefalsetruefalse4truefalsetrue12131213falsefalsefalsetruefalseMonetaryrr:NonNegativeMonetaryTypemonetaryYou would pay the following expenses if you did not redeem your shares. Include the second 1-, 3-, 5-, and 10-year periods and related narrative explanation only if a sales charge (load) or other fee is charged upon redemption.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 4 -Subparagraph f -Subsection instructions falsefalse10 YearsfalseUSDfalsefalse$1falseRowperiodPeriod*Rowdei_DocumentInformationDocumentAxisAxis*Rowdei_LegalEntityAxisAxis*Rowrr_ProspectusShareClassAxisAxis*RowunitUnit*duration2010-01-29T00:00:002011-01-31T00:00:00falsefalseGAMCO Westwood Balanced Fund [Member]dei_DocumentInformationDocumentAxisxbrldihttp://xbrl.org/2006/xbrldiwebax_S000001080Memberdei_DocumentInformationDocumentAxisexplicitMemberfalsefalseProspectus, Class A, B, C and I Shares [Member]dei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldiwebax_ProspectusTwoMemberdei_LegalEntityAxisexplicitMemberfalsefalseClass A, GAMCO Westwood Balanced Fund 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Foreign companies may also be subject to significantly higher levels of taxation than U.S. companies, including potentially confiscatory levels of taxation, thereby reducing their earnings potential, and amounts realized on foreign securities may be subject to high levels of foreign taxation for which no U.S. federal income tax deductions or credits will be available to shareholders.</p><p>Foreign securities may be denominated in foreign currencies. Therefore, the value of the Balanced Fund&#8217;s assets and income in U.S. dollars may be affected by changes in exchange rates and regulations, since exchange rates for foreign currencies change daily. The combination of currency risk and market risk tends to make securities traded in foreign markets more volatile than securities traded exclusively in the U.S. Although the Balanced Fund values its assets daily in U.S. dollars, it will not convert its holdings of foreign currencies to U.S. dollars daily. 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The Fund can select which Class to include (e.g., the oldest Class, the Class with the greatest net assets).Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subparagraph ii -Subsection b falsefalse20059false9false0rr_AnnualReturn2006rrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel1truetruefalse0.1210.121falsefalsefalsetruefalseOtherxbrli:pureItemTypepureIf the Fund has annual returns for at least one calendar year, provide a bar chart showing the Fund's annual total returns for each of the last 10 calendar years (or for the life of the Fund if less than 10 years), but only for periods subsequent to the effective date of the Fund's registration statement. Present the corresponding numerical return adjacent to each bar. If the Fund's fiscal year is other than a calendar year, include the year-to-date return information as of the end of the most recent quarter in a footnote to the bar chart. Following the bar chart, disclose the Fund's highest and lowest return for a quarter during the 10 years or other period of the bar chart. When a Multiple Class Fund offers more than one Class in the prospectus, provide annual total returns in the bar chart for only one of those Classes. The Fund can select which Class to include (e.g., the oldest Class, the Class with the greatest net assets).Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subparagraph ii -Subsection b falsefalse20060rr_AnnualReturn2006rrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel1truetruefalse0.1210.121falsefalsefalsetruefalseOtherxbrli:pureItemTypepureIf the Fund has annual returns for at least one calendar year, provide a bar chart showing the Fund's annual total returns for each of the last 10 calendar years (or for the life of the Fund if less than 10 years), but only for periods subsequent to the effective date of the Fund's registration statement. Present the corresponding numerical return adjacent to each bar. If the Fund's fiscal year is other than a calendar year, include the year-to-date return information as of the end of the most recent quarter in a footnote to the bar chart. Following the bar chart, disclose the Fund's highest and lowest return for a quarter during the 10 years or other period of the bar chart. When a Multiple Class Fund offers more than one Class in the prospectus, provide annual total returns in the bar chart for only one of those Classes. The Fund can select which Class to include (e.g., the oldest Class, the Class with the greatest net assets).Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subparagraph ii -Subsection b falsefalse200610false10false0rr_AnnualReturn2007rrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel1truetruefalse0.1000.100falsefalsefalsetruefalseOtherxbrli:pureItemTypepureIf the Fund has annual returns for at least one calendar year, provide a bar chart showing the Fund's annual total returns for each of the last 10 calendar years (or for the life of the Fund if less than 10 years), but only for periods subsequent to the effective date of the Fund's registration statement. Present the corresponding numerical return adjacent to each bar. If the Fund's fiscal year is other than a calendar year, include the year-to-date return information as of the end of the most recent quarter in a footnote to the bar chart. Following the bar chart, disclose the Fund's highest and lowest return for a quarter during the 10 years or other period of the bar chart. When a Multiple Class Fund offers more than one Class in the prospectus, provide annual total returns in the bar chart for only one of those Classes. The Fund can select which Class to include (e.g., the oldest Class, the Class with the greatest net assets).Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subparagraph instructions -Clause 3 -Exhibit a -Subsection b falsefalse20070rr_AnnualReturn2007rrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel1truetruefalse0.1000.100falsefalsefalsetruefalseOtherxbrli:pureItemTypepureIf the Fund has annual returns for at least one calendar year, provide a bar chart showing the Fund's annual total returns for each of the last 10 calendar years (or for the life of the Fund if less than 10 years), but only for periods subsequent to the effective date of the Fund's registration statement. Present the corresponding numerical return adjacent to each bar. If the Fund's fiscal year is other than a calendar year, include the year-to-date return information as of the end of the most recent quarter in a footnote to the bar chart. Following the bar chart, disclose the Fund's highest and lowest return for a quarter during the 10 years or other period of the bar chart. When a Multiple Class Fund offers more than one Class in the prospectus, provide annual total returns in the bar chart for only one of those Classes. The Fund can select which Class to include (e.g., the oldest Class, the Class with the greatest net assets).Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subparagraph instructions -Clause 3 -Exhibit a -Subsection b falsefalse200711false11false0rr_AnnualReturn2008rrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel1truetruefalse-0.195-0.195falsefalsefalsetruefalseOtherxbrli:pureItemTypepureIf the Fund has annual returns for at least one calendar year, provide a bar chart showing the Fund's annual total returns for each of the last 10 calendar years (or for the life of the Fund if less than 10 years), but only for periods subsequent to the effective date of the Fund's registration statement. Present the corresponding numerical return adjacent to each bar. If the Fund's fiscal year is other than a calendar year, include the year-to-date return information as of the end of the most recent quarter in a footnote to the bar chart. Following the bar chart, disclose the Fund's highest and lowest return for a quarter during the 10 years or other period of the bar chart. When a Multiple Class Fund offers more than one Class in the prospectus, provide annual total returns in the bar chart for only one of those Classes. The Fund can select which Class to include (e.g., the oldest Class, the Class with the greatest net assets).Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subparagraph ii -Subsection b falsefalse20080rr_AnnualReturn2008rrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel1truetruefalse-0.195-0.195falsefalsefalsetruefalseOtherxbrli:pureItemTypepureIf the Fund has annual returns for at least one calendar year, provide a bar chart showing the Fund's annual total returns for each of the last 10 calendar years (or for the life of the Fund if less than 10 years), but only for periods subsequent to the effective date of the Fund's registration statement. Present the corresponding numerical return adjacent to each bar. If the Fund's fiscal year is other than a calendar year, include the year-to-date return information as of the end of the most recent quarter in a footnote to the bar chart. 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Following the bar chart, disclose the Fund's highest and lowest return for a quarter during the 10 years or other period of the bar chart. When a Multiple Class Fund offers more than one Class in the prospectus, provide annual total returns in the bar chart for only one of those Classes. The Fund can select which Class to include (e.g., the oldest Class, the Class with the greatest net assets).Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subparagraph instructions -Clause 3 -Exhibit a -Subsection b falsefalse20090rr_AnnualReturn2009rrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel1truetruefalse0.0950.095falsefalsefalsetruefalseOtherxbrli:pureItemTypepureIf the Fund has annual returns for at least one calendar year, provide a bar chart showing the Fund's annual total returns for each of the last 10 calendar years (or for the life of the Fund if less than 10 years), but only for periods subsequent to the effective date of the Fund's registration statement. Present the corresponding numerical return adjacent to each bar. 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1/31/2011 TwelveMonthsEnded_31Jan2011_S000001080_Member_C000002911_Member_After_Taxes_On_Distributions_And_Sales_Member_Prospectus_Two_Memberhttp://www.sec.gov/CIK0000796229duration2010-01-29T00:00:002011-01-31T00:00:00falsefalseGAMCO Westwood Balanced Fund [Member]dei_DocumentInformationDocumentAxisxbrldihttp://xbrl.org/2006/xbrldiwebax_S000001080Memberdei_DocumentInformationDocumentAxisexplicitMemberfalsefalseProspectus, Class A, B, C and I Shares [Member]dei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldiwebax_ProspectusTwoMemberdei_LegalEntityAxisexplicitMemberfalsefalseReturn After Taxes on Distributions and Sale of Fund Shares [Member]rr_PerformanceMeasureAxisxbrldihttp://xbrl.org/2006/xbrldirr_AfterTaxesOnDistributionsAndSalesMemberrr_PerformanceMeasureAxisexplicitMemberfalsefalseClass A, GAMCO Westwood Balanced Fund [Member]rr_ProspectusShareClassAxisxbrldihttp://xbrl.org/2006/xbrldiwebax_C000002911Memberrr_ProspectusShareClassAxisexplicitMemberPureStandardhttp://www.xbrl.org/2003/instancepurexbrli08falsefalsetruefalse{dei_DocumentInformationDocumentAxis} : Barclays Capital Government/Credit Bond Index [Member] {dei_LegalEntityAxis} : Prospectus, Class A, B, C and I Shares [Member] 1/29/2010 - 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1/31/2011 TwelveMonthsEnded_31Jan2011_Sixty_Percent_S_And_P_Five_Hundred_Index_And_Forty_Percent_Barclays_Capital_Government_Credit_Bond_Index_Member_Prospectus_Two_Memberhttp://www.sec.gov/CIK0000796229duration2010-01-29T00:00:002011-01-31T00:00:00falsefalse60% S&P 500 Index and 40% Barclays Capital Government/Credit Bond Index [Member]dei_DocumentInformationDocumentAxisxbrldihttp://xbrl.org/2006/xbrldiwebax_SixtyPercentSAndPFiveHundredIndexAndFortyPercentBarclaysCapitalGovernmentCreditBondIndexMemberdei_DocumentInformationDocumentAxisexplicitMemberfalsefalseProspectus, Class A, B, C and I Shares [Member]dei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldiwebax_ProspectusTwoMemberdei_LegalEntityAxisexplicitMemberPureStandardhttp://www.xbrl.org/2003/instancepurexbrli011falsefalsetruefalse{dei_DocumentInformationDocumentAxis} : Barclays Capital Government/Corporate Bond Index [Member] {dei_LegalEntityAxis} : Prospectus, Class A, B, C and I Shares [Member] 1/29/2010 - 1/31/2011 TwelveMonthsEnded_31Jan2011_Barclays_Capital_Government_Corporate_Bond_Index_Member_Prospectus_Two_Memberhttp://www.sec.gov/CIK0000796229duration2010-01-29T00:00:002011-01-31T00:00:00falsefalseBarclays Capital Government/Corporate Bond Index [Member]dei_DocumentInformationDocumentAxisxbrldihttp://xbrl.org/2006/xbrldiwebax_BarclaysCapitalGovernmentCorporateBondIndexMemberdei_DocumentInformationDocumentAxisexplicitMemberfalsefalseProspectus, Class A, B, C and I Shares [Member]dei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldiwebax_ProspectusTwoMemberdei_LegalEntityAxisexplicitMemberPureStandardhttp://www.xbrl.org/2003/instancepurexbrli012falsefalsetruefalse{dei_DocumentInformationDocumentAxis} : 60% S&P 500 Index and 40% Barclays Capital Government/Corporate Bond Index [Member] {dei_LegalEntityAxis} : Prospectus, Class A, B, C and I Shares [Member] 1/29/2010 - 1/31/2011 TwelveMonthsEnded_31Jan2011_Sixty_Percent_S_And_P500_Index_And_Forty_Percent_Barclays_Capital_Government_Corporate_Bond_Index_Member_Prospectus_Two_Memberhttp://www.sec.gov/CIK0000796229duration2010-01-29T00:00:002011-01-31T00:00:00falsefalse60% S&P 500 Index and 40% Barclays Capital Government/Corporate Bond Index [Member]dei_DocumentInformationDocumentAxisxbrldihttp://xbrl.org/2006/xbrldiwebax_SixtyPercentSAndP500IndexAndFortyPercentBarclaysCapitalGovernmentCorporateBondIndexMemberdei_DocumentInformationDocumentAxisexplicitMemberfalsefalseProspectus, Class A, B, C and I Shares [Member]dei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldiwebax_ProspectusTwoMemberdei_LegalEntityAxisexplicitMemberPureStandardhttp://www.xbrl.org/2003/instancepurexbrli01false1false0natruenanaNo definition available.truefalsefalsefalsefalsefalsefalsefalsefalsefalsehttp://gabelli.com/role/averageannualtotalreturnsgamcowestwoodbalancedfundclassbcandi1falsefalsefalse00falsefalsefalsetruefalse2falsefalsefalse00falsefalsefalsetruefalse3falsefalsefalse00falsefalsefalsetruefalse4falsefalsefalse00falsefalsefalsetruefalse5falsefalsefalse00falsefalsefalsetruefalse6falsefalsefalse00falsefalsefalsetruefalse7falsefalsefalse00falsefalsefalsetruefalse8falsefalsefalse00falsefalsefalsetruefalse9falsefalsefalse00falsefalsefalsetruefalse10falsefalsefalse00falsefalsefalsetruefalse11falsefalsefalse00falsefalsefalsetruefalse12falsefalsefalse00falsefalsefalsetruefalseOthernaNo definition available.No authoritative reference available.falsefalseAverage Annual Total Returns - Gamco Westwood Balanced Fund (Class A, B, C and I)0natruenanaNo definition available.truefalsefalsefalsefalsefalsefalsefalsefalsefalsehttp://gabelli.com/role/averageannualtotalreturnsgamcowestwoodbalancedfundclassbcandi1falsefalsefalse00falsefalsefalsetruefalse2falsefalsefalse00falsefalsefalsetruefalse3falsefalsefalse00falsefalsefalsetruefalse4falsefalsefalse00falsefalsefalsetruefalse5falsefalsefalse00falsefalsefalsetruefalse6falsefalsefalse00falsefalsefalsetruefalse7falsefalsefalse00falsefalsefalsetruefalse8falsefalsefalse00falsefalsefalsetruefalse9falsefalsefalse00falsefalsefalsetruefalse10falsefalsefalse00falsefalsefalsetruefalse11falsefalsefalse00falsefalsefalsetruefalse12falsefalsefalse00falsefalsefalsetruefalseOthernaNo definition available.No authoritative reference available.falsefalseAverage Annual Total Returns - Gamco Westwood Balanced Fund (Class A, B, C and I)3true3true0rr_AverageAnnualReturnAbstractrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel1falsetruefalse00falsefalsefalsetruefalse2falsetruefalse00falsefalsefalsetruefalse3falsetruefalse00falsefalsefalsetruefalse4falsetruefalse00falsefalsefalsetruefalse5falsetruefalse00falsefalsefalsetruefalse6falsetruefalse00falsefalsefalsetruefalse7falsetruefalse00falsefalsefalsetruefalse8falsetruefalse00falsefalsefalsetruefalse9falsetruefalse00falsefalsefalsetruefalse10falsetruefalse00falsefalsefalsetruefalse11falsetruefalse00falsefalsefalsetruefalse12falsetruefalse00falsefalsefalsetruefalseOtherxbrli:stringItemTypestringNo definition available.falsefalseAverage Annual Total Returns0rr_AverageAnnualReturnAbstractrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel1falsetruefalse00falsefalsefalsetruefalse2falsetruefalse00falsefalsefalsetruefalse3falsetruefalse00falsefalsefalsetruefalse4falsetruefalse00falsefalsefalsetruefalse5falsetruefalse00falsefalsefalsetruefalse6falsetruefalse00falsefalsefalsetruefalse7falsetruefalse00falsefalsefalsetruefalse8falsetruefalse00falsefalsefalsetruefalse9falsetruefalse00falsefalsefalsetruefalse10falsetruefalse00falsefalsefalsetruefalse11falsetruefalse00falsefalsefalsetruefalse12falsetruefalse00falsefalsefalsetruefalseOtherxbrli:stringItemTypestringNo definition available.falsefalseAverage Annual Total Returns4false4false0rr_AverageAnnualReturnCaptionrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsetruefalse00Average Annual Total Returns (for the periods ended December 31, 2010)falsefalsefalsetruefalse2falsetruefalse00falsefalsefalsetruefalse3falsetruefalse00falsefalsefalsetruefalse4falsetruefalse00falsefalsefalsetruefalse5falsetruefalse00falsefalsefalsetruefalse6falsetruefalse00falsefalsefalsetruefalse7falsetruefalse00falsefalsefalsetruefalse8falsetruefalse00falsefalsefalsetruefalse9falsetruefalse00falsefalsefalsetruefalse10falsetruefalse00falsefalsefalsetruefalse11falsetruefalse00falsefalsefalsetruefalse12falsetruefalse00falsefalsefalsetruefalseOtherxbrli:stringItemTypestringThis item represents Average Anuual Total Returns. 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If a Multiple Class Fund offers a Class in the prospectus that converts into another Class after a stated period, compute average annual total returns in the table by using the returns of the other Class for the period after conversion.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subparagraph instructions -Clause 5 -Subsection b falsefalseCaption5false5false0rr_PerformanceTableDoesReflectSalesLoadsrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00with maximum sales charge, if applicablefalsefalsefalsetruefalse2falsefalsefalse00falsefalsefalsetruefalse3falsefalsefalse00falsefalsefalsetruefalse4falsefalsefalse00falsefalsefalsetruefalse5falsefalsefalse00falsefalsefalsetruefalse6falsefalsefalse00falsefalsefalsetruefalse7falsefalsefalse00falsefalsefalsetruefalse8falsefalsefalse00falsefalsefalsetruefalse9falsefalsefalse00falsefalsefalsetruefalse10falsefalsefalse00falsefalsefalsetruefalse11falsefalsefalse00falsefalsefalsetruefalse12falsefalsefalse00falsefalsefalsetruefalseOtherxbrli:stringItemTypestringIf the Fund has annual returns for at least one calendar year, provide a table showing the Fund's (A) average annual total return; (B) average annual total return (after taxes on distributions); and (C) average annual total return (after taxes on distributions and redemption). A Money Market Fund should show only the returns described in clause (A) of the preceding sentence. All returns should be shown for 1-, 5-, and 10- calendar year periods ending on the date of the most recently completed calendar year (or for the life of the Fund, if shorter), but only for periods subsequent to the effective date of the Fund's registration statement. The table also shouldshow the returns of an appropriate broadbased securities market index as defined in Instruction 5 to Item 22(b)(7) for the same periods. A Fund that has been in existence for more than 10 years also may include returns for the life of the Fund. A Money Market Fund may provide the Fund's 7-day yield ending on the date of the most recent calendar year or disclose a toll-free (or collect) telephone number that investors can use to obtain the Fund's current 7-day yield. For a Fund (other than a Money Market Fund or a Fund described in General Instruction C.3.(d)(iii)), provide the information in the following table with the specified captions AVERAGE ANNUAL TOTAL RETURNS (For the periods ended December 31, _____)Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subparagraph iii -Subsection b falsefalsePerformance Table Does Reflect Sales Loads0rr_PerformanceTableDoesReflectSalesLoadsrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00with maximum sales charge, if applicablewith maximum sales charge, if applicablefalsefalsefalsetruefalse2falsefalsefalse00falsefalsefalsetruefalse3falsefalsefalse00falsefalsefalsetruefalse4falsefalsefalse00falsefalsefalsetruefalse5falsefalsefalse00falsefalsefalsetruefalse6falsefalsefalse00falsefalsefalsetruefalse7falsefalsefalse00falsefalsefalsetruefalse8falsefalsefalse00falsefalsefalsetruefalse9falsefalsefalse00falsefalsefalsetruefalse10falsefalsefalse00falsefalsefalsetruefalse11falsefalsefalse00falsefalsefalsetruefalse12falsefalsefalse00falsefalsefalsetruefalseOtherxbrli:stringItemTypestringIf the Fund has annual returns for at least one calendar year, provide a table showing the Fund's (A) average annual total return; (B) average annual total return (after taxes on distributions); and (C) average annual total return (after taxes on distributions and redemption). A Money Market Fund should show only the returns described in clause (A) of the preceding sentence. All returns should be shown for 1-, 5-, and 10- calendar year periods ending on the date of the most recently completed calendar year (or for the life of the Fund, if shorter), but only for periods subsequent to the effective date of the Fund's registration statement. The table also shouldshow the returns of an appropriate broadbased securities market index as defined in Instruction 5 to Item 22(b)(7) for the same periods. A Fund that has been in existence for more than 10 years also may include returns for the life of the Fund. A Money Market Fund may provide the Fund's 7-day yield ending on the date of the most recent calendar year or disclose a toll-free (or collect) telephone number that investors can use to obtain the Fund's current 7-day yield. For a Fund (other than a Money Market Fund or a Fund described in General Instruction C.3.(d)(iii)), provide the information in the following table with the specified captions AVERAGE ANNUAL TOTAL RETURNS (For the periods ended December 31, _____)Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subparagraph iii -Subsection b falsefalsePerformance Table Does Reflect Sales Loads6false6false0rr_AverageAnnualReturnColumnNamerrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsetruefalse00falsefalsefalsetruefalse2falsetruefalse00GAMCO Westwood Balanced Fund Class A Sharesfalsefalsefalsetruefalse3falsetruefalse00GAMCO Westwood Balanced Fund Class B Shares (commenced operations on March 27, 2001)falsefalsefalsetruefalse4falsetruefalse00GAMCO Westwood Balanced Fund Class C Shares (commenced operations on September 25, 2001)falsefalsefalsetruefalse5falsetruefalse00GAMCO Westwood Balanced Fund Class I Shares (commenced operations on January 11, 2008)falsefalsefalsetruefalse6falsetruefalse00GAMCO Westwood Balanced Fund Class A Sharesfalsefalsefalsetruefalse7falsetruefalse00GAMCO Westwood Balanced Fund Class A Sharesfalsefalsefalsetruefalse8falsetruefalse00Indexesfalsefalsefalsetruefalse9falsetruefalse00Indexesfalsefalsefalsetruefalse10falsetruefalse00Indexesfalsefalsefalsetruefalse11falsetruefalse00Indexesfalsefalsefalsetruefalse12falsetruefalse00IndexesfalsefalsefalsetruefalseOtherus-types:textBlockItemTypestringThis item represents Average Anuual Total Returns. If a Multiple Class Fund offers a Class in the prospectus that converts into another Class after a stated period, compute average annual total returns in the table by using the returns of the other Class for the period after conversion.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subparagraph iii -Clause 1 -Exhibit 1 -Subsection b falsefalseColumn0rr_AverageAnnualReturnColumnNamerrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsetruefalse00falsefalsefalsetruefalse2falsetruefalse00GAMCO Westwood Balanced Fund Class A SharesGAMCO Westwood Balanced Fund Class A Sharesfalsefalsefalsetruefalse3falsetruefalse00GAMCO Westwood Balanced Fund Class B Shares (commenced operations on March 27, 2001)GAMCO Westwood Balanced Fund Class B Shares (commenced operations on March 27, 2001)falsefalsefalsetruefalse4falsetruefalse00GAMCO Westwood Balanced Fund Class C Shares (commenced operations on September 25, 2001)GAMCO Westwood Balanced Fund Class C Shares (commenced operations on September 25, 2001)falsefalsefalsetruefalse5falsetruefalse00GAMCO Westwood Balanced Fund Class I Shares (commenced operations on January 11, 2008)GAMCO Westwood Balanced Fund Class I Shares (commenced operations on January 11, 2008)falsefalsefalsetruefalse6falsetruefalse00GAMCO Westwood Balanced Fund Class A SharesGAMCO Westwood Balanced Fund Class A Sharesfalsefalsefalsetruefalse7falsetruefalse00GAMCO Westwood Balanced Fund Class A SharesGAMCO Westwood Balanced Fund Class A Sharesfalsefalsefalsetruefalse8falsetruefalse00IndexesIndexesfalsefalsefalsetruefalse9falsetruefalse00IndexesIndexesfalsefalsefalsetruefalse10falsetruefalse00IndexesIndexesfalsefalsefalsetruefalse11falsetruefalse00IndexesIndexesfalsefalsefalsetruefalse12falsetruefalse00IndexesIndexesfalsefalsefalsetruefalseOtherus-types:textBlockItemTypestringThis item represents Average Anuual Total Returns. 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This tag is used when this is reflected in a footnote.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subparagraph iii -Clause 1 -Exhibit 5 -Subsection b falsefalseIndex No Deduction for Fees, Expenses, Taxes [Text]0rr_IndexNoDeductionForFeesExpensesTaxesrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00falsefalsefalsetruefalse2falsefalsefalse00falsefalsefalsetruefalse3falsefalsefalse00falsefalsefalsetruefalse4falsefalsefalse00falsefalsefalsetruefalse5falsefalsefalse00falsefalsefalsetruefalse6falsefalsefalse00falsefalsefalsetruefalse7falsefalsefalse00falsefalsefalsetruefalse8falsefalsefalse00(reflects no deduction for fees, expenses or taxes)(reflects no deduction for fees, expenses or taxes)falsefalsefalsetruefalse9falsefalsefalse00(reflects no deduction for fees, expenses or taxes)(reflects no deduction for fees, expenses or taxes)falsefalsefalsetruefalse10falsefalsefalse00(reflects no deduction for fees, expenses or taxes)(reflects no deduction for fees, expenses or taxes)falsefalsefalsetruefalse11falsefalsefalse00(reflects no deduction for fees, expenses or taxes)(reflects no deduction for fees, expenses or taxes)falsefalsefalsetruefalse12falsefalsefalse00(reflects no deduction for fees, expenses or taxes)(reflects no deduction for fees, expenses or taxes)falsefalsefalsetruefalseOtherxbrli:stringItemTypestringThe Performance Table includes a parenthetical, indicating that the Index "(reflects no deduction for fees, expenses or taxes)". This tag is used when this is reflected in a footnote.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subparagraph iii -Clause 1 -Exhibit 5 -Subsection b falsefalseIndex No Deduction for Fees, Expenses, Taxes [Text]9false9false0rr_AverageAnnualReturnLabelrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsetruefalse00falsefalsefalsetruefalse2falsetruefalse00Return Before Taxesfalsefalsefalsetruefalse3falsetruefalse00Return Before Taxesfalsefalsefalsetruefalse4falsetruefalse00Return Before Taxesfalsefalsefalsetruefalse5falsetruefalse00Return Before Taxesfalsefalsefalsetruefalse6falsetruefalse00Return After Taxes on Distributionsfalsefalsefalsetruefalse7falsetruefalse00Return After Taxes on Distributions and Sale of Fund Sharesfalsefalsefalsetruefalse8falsetruefalse00Barclays Capital Government/Credit Bond Indexfalsefalsefalsetruefalse9falsetruefalse00S&P 500 Indexfalsefalsefalsetruefalse10falsetruefalse0060% S&P 500 Index and 40% Barclays Capital Government/Credit Bond Indexfalsefalsefalsetruefalse11falsetruefalse00Barclays Capital Government/Corporate Bond Indexfalsefalsefalsetruefalse12falsetruefalse0060% S&P 500 Index and 40% Barclays Capital Government/Corporate Bond IndexfalsefalsefalsetruefalseOtherxbrli:stringItemTypestringThis item represents Average Anuual Total Returns. If a Multiple Class Fund offers a Class in the prospectus that converts into another Class after a stated period, compute average annual total returns in the table by using the returns of the other Class for the period after conversion.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subparagraph iii -Clause 1 -Exhibit 2 -Subsection b falsefalseLabel0rr_AverageAnnualReturnLabelrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsetruefalse00falsefalsefalsetruefalse2falsetruefalse00Return Before TaxesReturn Before Taxesfalsefalsefalsetruefalse3falsetruefalse00Return Before TaxesReturn Before Taxesfalsefalsefalsetruefalse4falsetruefalse00Return Before TaxesReturn Before Taxesfalsefalsefalsetruefalse5falsetruefalse00Return Before TaxesReturn Before Taxesfalsefalsefalsetruefalse6falsetruefalse00Return After Taxes on DistributionsReturn After Taxes on Distributionsfalsefalsefalsetruefalse7falsetruefalse00Return After Taxes on Distributions and Sale of Fund SharesReturn After Taxes on Distributions and Sale of Fund Sharesfalsefalsefalsetruefalse8falsetruefalse00Barclays Capital Government/Credit Bond IndexBarclays Capital Government/Credit Bond Indexfalsefalsefalsetruefalse9falsetruefalse00S&P 500 IndexS&P 500 Indexfalsefalsefalsetruefalse10falsetruefalse0060% S&P 500 Index and 40% Barclays Capital Government/Credit Bond Index60% S&P 500 Index and 40% Barclays Capital Government/Credit Bond Indexfalsefalsefalsetruefalse11falsetruefalse00Barclays Capital Government/Corporate Bond IndexBarclays Capital Government/Corporate Bond Indexfalsefalsefalsetruefalse12falsetruefalse0060% S&P 500 Index and 40% Barclays Capital Government/Corporate Bond Index60% S&P 500 Index and 40% Barclays Capital Government/Corporate Bond IndexfalsefalsefalsetruefalseOtherxbrli:stringItemTypestringThis item represents Average Anuual Total Returns. If a Multiple Class Fund offers a Class in the prospectus that converts into another Class after a stated period, compute average annual total returns in the table by using the returns of the other Class for the period after conversion.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subparagraph iii -Clause 1 -Exhibit 2 -Subsection b falsefalseLabel10false10false0rr_AverageAnnualReturnYear01rrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel1falsetruetrue00falsefalsefalsetruefalse2truetruetrue0.04510.0451falsefalsefalsetruefalse3truetruetrue0.03410.0341falsefalsefalsetruefalse4truetruetrue0.07410.0741falsefalsefalsetruefalse5truetruetrue0.09410.0941falsefalsefalsetruefalse6truetruetrue0.04310.0431falsefalsefalsetruefalse7truetruetrue0.03140.0314falsefalsefalsetruefalse8truetruetrue0.06590.0659[1],[2]falsefalsefalsetruefalse9truetruetrue0.15080.1508falsefalsefalsetruefalse10truetruetrue0.09990.0999[1]falsefalsefalsetruefalse11truetruetrue0.06610.0661[1],[2]falsefalsefalsetruefalse12truetruetrue0.11690.1169[1]falsefalsefalsetruefalseOtherxbrli:pureItemTypepureReturn Before Taxes.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subparagraph iii -Clause 1 -Exhibit 2 -Subsection b falsefalsePast One Year0rr_AverageAnnualReturnYear01rrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel1falsetruetrue00falsefalsefalsetruefalse2truetruetrue0.04510.0451falsefalsefalsetruefalse3truetruetrue0.03410.0341falsefalsefalsetruefalse4truetruetrue0.07410.0741falsefalsefalsetruefalse5truetruetrue0.09410.0941falsefalsefalsetruefalse6truetruetrue0.04310.0431falsefalsefalsetruefalse7truetruetrue0.03140.0314falsefalsefalsetruefalse8truetruetrue0.06590.0659[1],[2]falsefalsefalsetruefalse9truetruetrue0.15080.1508falsefalsefalsetruefalse10truetruetrue0.09990.0999[1]falsefalsefalsetruefalse11truetruetrue0.06610.0661[1],[2]falsefalsefalsetruefalse12truetruetrue0.11690.1169[1]falsefalsefalsetruefalseOtherxbrli:pureItemTypepureReturn Before Taxes.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subparagraph iii -Clause 1 -Exhibit 2 -Subsection b falsefalsePast One Year11false11false0rr_AverageAnnualReturnYear05rrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel1falsetruetrue00falsefalsefalsetruefalse2truetruetrue0.02600.0260falsefalsefalsetruefalse3truetruetrue0.02540.0254falsefalsefalsetruefalse4truetruetrue0.02930.0293falsefalsefalsetruefalse5truetruetrue0.03840.0384falsefalsefalsetruefalse6truetruetrue0.01520.0152falsefalsefalsetruefalse7truetruetrue0.01960.0196falsefalsefalsetruefalse8truetruetrue0.05560.0556[1],[2]falsefalsefalsetruefalse9truetruetrue0.02290.0229falsefalsefalsetruefalse10truetruetrue0.04250.0425[1]falsefalsefalsetruefalse11truetruetrue0.05530.0553[1],[2]falsefalsefalsetruefalse12truetruetrue0.03590.0359[1]falsefalsefalsetruefalseOtherxbrli:pureItemTypepureReturn Before Taxes.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subparagraph iii -Clause 1 -Exhibit 2 -Subsection b falsefalsePast Five Years0rr_AverageAnnualReturnYear05rrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel1falsetruetrue00falsefalsefalsetruefalse2truetruetrue0.02600.0260falsefalsefalsetruefalse3truetruetrue0.02540.0254falsefalsefalsetruefalse4truetruetrue0.02930.0293falsefalsefalsetruefalse5truetruetrue0.03840.0384falsefalsefalsetruefalse6truetruetrue0.01520.0152falsefalsefalsetruefalse7truetruetrue0.01960.0196falsefalsefalsetruefalse8truetruetrue0.05560.0556[1],[2]falsefalsefalsetruefalse9truetruetrue0.02290.0229falsefalsefalsetruefalse10truetruetrue0.04250.0425[1]falsefalsefalsetruefalse11truetruetrue0.05530.0553[1],[2]falsefalsefalsetruefalse12truetruetrue0.03590.0359[1]falsefalsefalsetruefalseOtherxbrli:pureItemTypepureReturn Before Taxes.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subparagraph iii -Clause 1 -Exhibit 2 -Subsection b falsefalsePast Five Years12false12false0rr_AverageAnnualReturnYear10rrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel1falsetruetrue00falsefalsefalsetruefalse2truetruetrue0.03230.0323falsefalsefalsetruefalse3truetruetrue0.03130.0313falsefalsefalsetruefalse4truetruetrue0.03180.0318falsefalsefalsetruefalse5truetruetrue0.03980.0398falsefalsefalsetruefalse6truetruetrue0.02340.0234falsefalsefalsetruefalse7truetruetrue0.02510.0251falsefalsefalsetruefalse8truetruetrue0.05830.0583[1],[2]falsefalsefalsetruefalse9truetruetrue0.01420.0142falsefalsefalsetruefalse10truetruetrue0.04070.0407[1]falsefalsefalsetruefalse11truetruetrue0.05780.0578[1],[2]falsefalsefalsetruefalse12truetruetrue0.03160.0316[1]falsefalsefalsetruefalseOtherxbrli:pureItemTypepureReturn Before Taxes.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subparagraph iii -Clause 1 -Exhibit 2 -Subsection b falsefalsePast Ten Years0rr_AverageAnnualReturnYear10rrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel1falsetruetrue00falsefalsefalsetruefalse2truetruetrue0.03230.0323falsefalsefalsetruefalse3truetruetrue0.03130.0313falsefalsefalsetruefalse4truetruetrue0.03180.0318falsefalsefalsetruefalse5truetruetrue0.03980.0398falsefalsefalsetruefalse6truetruetrue0.02340.0234falsefalsefalsetruefalse7truetruetrue0.02510.0251falsefalsefalsetruefalse8truetruetrue0.05830.0583[1],[2]falsefalsefalsetruefalse9truetruetrue0.01420.0142falsefalsefalsetruefalse10truetruetrue0.04070.0407[1]falsefalsefalsetruefalse11truetruetrue0.05780.0578[1],[2]falsefalsefalsetruefalse12truetruetrue0.03160.0316[1]falsefalsefalsetruefalseOtherxbrli:pureItemTypepureReturn Before Taxes.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subparagraph iii -Clause 1 -Exhibit 2 -Subsection b falsefalsePast Ten Years1Effective January 31, 2011, the Fund is changing its broad based benchmark from 60% S&P 500 Index and 40% Barclays Capital Government/Corporate Bond Index to 60% S&P 500 Index and 40% Barclays Capital Government/Credit Bond Index. For purposes of this Prospectus, we have included the Fund's old broad based benchmark, its new broad based benchmark - the Barclays Capital Government/Credit Bond Index - and its old benchmark - 60% S&P 500 Index and 40% Barclays Capital Government/Corporate Bond Index. Going forward, we will show the Fund's performance against components of the Barclays Capital Government/Credit Bond Index and the S&P 500 Index, rather than the Barclays Capital Government/Corporate Bond Index, as the Adviser believes the Barclays Capital Government/Corporate Bond Index is no longer an appropriate broad based benchmark for the Fund. The Adviser believes the Barclays Capital Government/Credit Bond Index is a better broad based benchmark because of the Index's small exposure to corporate bonds, which is more representative of the Fund's investment strategy. 2Effective January 31, 2011, the Fund is changing its broad based benchmark from the Barclays Capital Government/Corporate Bond Index to the Barclays Capital Government/Credit Bond Index. For purposes of this Prospectus, we have included the Fund's old broad based benchmark and its new broad based benchmark - the Barclays Capital Government/Credit Bond Index. Going forward, we will show the Fund's performance against the Barclays Capital Government/Credit Bond Index rather than the Barclays Capital Government/Corporate Bond Index, as the Adviser believes the Barclays Capital Government/Corporate Bond Index is no longer an appropriate broad based benchmark for the Fund. The Adviser believes the Barclays Capital Government/Credit Bond Index is a better broad based benchmark because of the Index's small exposure to corporate bonds, which is more representative of the Fund's investment strategy. 1211Average Annual Total Returns - Gamco Westwood Balanced Fund (Class A, B, C and I)UnKnownUnKnownUnKnownUnKnowntruetrueColumnperiodPeriod*ColumnprimaryElement*Columnrr_DocumentInformationDocumentAxisAxiswebax_Prospectus_Two_MemberRowdei_LegalEntityAxisAxiswebax_S000001080_MemberRowrr_ProspectusShareClassAxisAxis*Rowrr_PerformanceMeasureAxisAxis*Rowdei_DocumentInformationDocumentAxisAxis*RowunitUnit*falsefalsefalseOtherus-types:textBlockItemTypestringContains a command for the SEC Viewer for the role corresponding to PerformanceTableData.No authoritative reference available.falsefalsePerformance [Table]29false0rr_PerformanceTableNarrativeTextBlockrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<p>The returns shown for Class B, Class C, and Class I Shares prior to their actual inception dates are those of the Class AAA Shares of the Balanced Fund which are not offered in this Prospectus. All Classes of the Balanced Fund would have substantially similar annual returns because the shares are invested in the same portfolio of securities and the annual returns would differ only to the extent that the Classes do not have the same expenses.</p> <p>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 the investor&#8217;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 401(k) plans or IRAs.</p>falsefalsefalsefalsefalseOtherus-types:textBlockItemTypestringIf the Fund has annual returns for at least one calendar year, provide a table showing the Fund's (A) average annual total return; (B) average annual total return (after taxes on distributions); and (C) average annual total return (after taxes on distributions and redemption). A Money Market Fund should show only the returns described in clause (A) of the preceding sentence. All returns should be shown for 1-, 5-, and 10- calendar year periods ending on the date of the most recently completed calendar year (or for the life of the Fund, if shorter), but only for periods subsequent to the effective date of the Fund's registration statement. The table also shouldshow the returns of an appropriate broadbased securities market index as defined in Instruction 5 to Item 22(b)(7) for the same periods. A Fund that has been in existence for more than 10 years also may include returns for the life of the Fund. A Money Market Fund may provide the Fund's 7-day yield ending on the date of the most recent calendar year or disclose a toll-free (or collect) telephone number that investors can use to obtain the Fund's current 7-day yield. For a Fund (other than a Money Market Fund or a Fund described in General Instruction C.3.(d)(iii)), provide the information in the following table with the specified captions AVERAGE ANNUAL TOTAL RETURNS (For the periods ended December 31, _____). For a Fund that provides annual total returns for only one calendar year or for a Fund that does not include the bar chart because it does not have annual returns for a full calendar year, modify, as appropriate, the narrative explanation required by paragraph (c)(2)(i) (e.g., by stating that the information gives some indication of the risks of an investment in the Fund by comparing the Fund's performance with a broad measure of market performance).Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subparagraph iv -Subsection b falsefalsePerformance Table Narrative1Sales loads are not reflected in the above chart. If sales loads were reflected, the Balanced Fund's returns would be less than those shown. 128Risk/Return Summary - Gamco Westwood Balanced Fund (Class A, B C and I Shares) (GAMCO Westwood Balanced Fund [Member], Prospectus, Class A, B, C and I Shares [Member])UnKnownUnKnownUnKnownUnKnownfalsetrue