Label	Element	Value
TCW Relative Value Dividend Appreciation Fund
Risk/Return:	rr_RiskReturnAbstract
Risk/Return [Heading]	rr_RiskReturnHeading	TCW Relative Value Dividend Appreciation Fund
Objective [Heading]	rr_ObjectiveHeading	Investment Objective
Objective, Primary [Text Block]	rr_ObjectivePrimaryTextBlock	The Fund’s investment objective is to seek to realize a high level of dividend income consistent with prudent investment management.
Objective, Secondary [Text Block]	rr_ObjectiveSecondaryTextBlock	Capital appreciation is a secondary objective.
Expense [Heading]	rr_ExpenseHeading	Fees and Expenses of the Fund
Expense Narrative [Text Block]	rr_ExpenseNarrativeTextBlock	This table describes the fees and expenses you may pay if you buy and hold shares of the Fund. You may pay additional fees or commissions to broker-dealers or other financial intermediaries for the purchase of Class I shares of the Fund, which are not reflected in the table below.
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)
Fee Waiver or Reimbursement over Assets, Date of Termination	rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination	March 1, 2022
Portfolio Turnover [Heading]	rr_PortfolioTurnoverHeading	Portfolio Turnover
Portfolio Turnover [Text Block]	rr_PortfolioTurnoverTextBlock	The Fund pays transaction costs when it buys and sells securities (or “turns over” its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when Fund shares are held in a taxable account. These costs, which are not reflected in annual fund operating expenses or in the Example, affect the Fund’s performance. During the most recent fiscal year, the Fund’s portfolio turnover rate was 19.68% of the average value of its portfolio.
Portfolio Turnover, Rate	rr_PortfolioTurnoverRate	19.68%
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. This example assumes that you invest $10,000 in the Fund for the time periods indicated and then redeem all your shares at the end of those periods. The example also assumes that your investment has a 5% return each year and that the Fund’s operating expenses remain the same. The cost of investing in the N share class of the Fund reflects the net expenses of the N share class of the Fund that result from the contractual expense limitation in the first year only. 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	Under normal circumstances, the Fund invests at least 80% of the value of its net assets, plus any borrowings for investment purposes, in equity securities of companies that have a record of paying dividends. If the Fund changes this investment policy, it will notify shareholders in writing at least 60 days in advance of the change. Equity securities include common and preferred stock; rights, warrants or options to purchase common or preferred stock; securities that may be converted into or exchanged for common or preferred stock, such as convertible preferred stock, convertible debt and Eurodollar convertible securities; equity securities of foreign companies listed on established exchanges, including NASDAQ; American Depository Receipts (ADRs); and other securities with equity characteristics. The portfolio manager analyzes economic and market conditions and identifies securities that the portfolio manager believes will make the best investments in the pursuit of the Fund’s investment objective. In selecting the Fund’s investments, the portfolio manager sometimes considers the extent to which businesses have leaders who prudently manage their environmental sustainability and social responsibilities with good governance and solid financial resources. Additionally, the portfolio manager considers various factors, including: •   a company’s market capitalization; •   a company’s price-to-book; •   a company’s price-to-earnings; •   a company’s price-to-sales; •   a company’s price-to-cash flow; and/or •   a company’s dividend yield. Portfolio securities may be sold for a number of reasons, including when a company fails to meet expectations or when the portfolio manager believes that (i) there has been a deterioration in the underlying fundamentals of a company, (ii) the intermediate- and long-term prospects for a company are poor, (iii) another security may offer a better investment opportunity, (iv) an individual security has reached its sell target, or (v) the portfolio should be rebalanced for diversification or portfolio weighting purposes.
Risk [Heading]	rr_RiskHeading	Principal Risks
Risk Narrative [Text Block]	rr_RiskNarrativeTextBlock	Since the Fund holds securities with fluctuating market prices, the value of the Fund’s shares will vary as its portfolio securities increase or decrease in value. Therefore, the value of your investment in the Fund could go down as well as up. You can lose money by investing in the Fund. The principal risks affecting the Fund that can cause a decline in value are:   •   equity risk: the risk that stocks and other equity securities generally fluctuate in value more than bonds and may decline in value over short or extended periods as a result of changes in a company’s financial condition or in overall market, economic and political conditions. •   market risk: the risk that returns from the securities in which the Fund invests may underperform returns from the general securities markets or other types of securities. •   public health emergency risks: the risk that pandemics and other public health emergencies, including outbreaks of infectious diseases such as the current outbreak of the novel coronavirus (“COVID-19”), can result, and in the case of COVID-19 is resulting, in market volatility and disruption, and materially and adversely impact economic conditions in ways that cannot be predicted, all of which could result in substantial investment losses. Containment efforts and related restrictive actions by governments and businesses have significantly diminished and disrupted     global economic activity across many industries. Less developed countries and their health systems may be more vulnerable to these impacts. The ultimate impact of COVID-19 or other health emergencies on global economic conditions and businesses is impossible to predict accurately. Ongoing and potential additional material adverse economic effects of indeterminate duration and severity are possible. The resulting adverse impact on the value of an investment in the Fund could be significant and prolonged. •   dividend-paying stock risk: the risk that dividend-paying stocks may underperform the broader stock market and that issuers of dividend-paying stocks may not declare dividends at current levels in the future. •   price volatility risk: the risk that the value of the Fund’s investment portfolio will change as the prices of its investments go up or down. •   value investing risk: the risk of investing in undervalued stocks, which may not realize their perceived value for extended periods of time or may never realize their perceived value. Value stocks may respond differently to market and other developments than other types of stocks. The value investment style may be out of favor or may not produce the best results over short or longer time periods and may increase the volatility of the Fund’s share price. Value-oriented funds typically underperform when growth investing is in favor. •   issuer risk: the risk that the value of a security may decline for reasons directly related to the issuer such as management performance, financial leverage and reduced demand for the issuer’s goods or services. •   liquidity risk: the risk that lack of a ready market or restrictions on resale may limit the ability of the Fund to sell a security at an advantageous time or price. The liquidity of the Fund’s assets may change over time. •   financial services sector risk: the risk that the Fund may be susceptible to the impact of market, economic, regulatory, and other factors affecting the financial services sector and that the value of the Fund may fluctuate more widely than it would for a fund that invests more broadly across varying sectors. Companies in the financial services sector may be affected by the overall economic conditions as well as by factors particular to the financial services sector, including changes in government regulations, changes in interest rates, availability of capital and cost to borrow, credit rating downgrades, and decreased liquidity in the credit market. •   portfolio management risk: the risk that an investment strategy may fail to produce the intended results. •   securities selection risk: the risk that the securities held by the Fund may underperform those held by other funds investing in the same asset class or benchmarks that are representative of the asset class because of the portfolio manager’s choice of securities. •   foreign investing risk: the risk that Fund share prices will fluctuate with market conditions, currency exchange rates and the economic and political climates of the foreign countries in which the Fund invests or has exposure. •   information technology sector risk: the risk that the Fund may be susceptible to the impact of market, economic, regulatory, and other factors affecting the information technology sector and that the value of the Fund may fluctuate more widely than it would for a fund that invests more broadly across varying sectors. Companies in the information technology sector may be affected by the overall economic conditions as well as by factors particular to the information technology sector, including intense competition, short product cycle, rapid product obsolescence, possible loss or impairment of intellectual property rights, and changes in government regulations. Please see “Principal Risks of the Funds” for a more detailed description of the risks of investing in the Fund. Your investment in the Fund is not a bank deposit and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency entity or person.
Risk Lose Money [Text]	rr_RiskLoseMoney	You can lose money by investing in the Fund.
Risk Not Insured Depository Institution [Text]	rr_RiskNotInsuredDepositoryInstitution	Your investment in the Fund is not a bank deposit and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency entity or person.
Bar Chart and Performance Table [Heading]	rr_BarChartAndPerformanceTableHeading	Investment Results
Performance Narrative [Text Block]	rr_PerformanceNarrativeTextBlock	The bar chart below shows how the Fund’s investment results have varied from year to year and the table below shows how the Fund’s average annual total returns for various periods compare with a broad measure of market performance. This information provides some indication of the risks of investing in the Fund by showing changes in the Fund’s performance from year to year. The bar chart shows performance of the Fund’s Class I shares. Class N performance may be lower than Class I performance because of the potentially lower expenses paid by Class I shares. Past results (before and after taxes) are not predictive of future results. Updated information on the Fund’s investment results can be obtained by visiting www.TCW.com.
Performance Information Illustrates Variability of Returns [Text]	rr_PerformanceInformationIllustratesVariabilityOfReturns	The bar chart below shows how the Fund’s investment results have varied from year to year and the table below shows how the Fund’s average annual total returns for various periods compare with a broad measure of market performance.
Performance Availability Website Address [Text]	rr_PerformanceAvailabilityWebSiteAddress	www.TCW.com
Performance Past Does Not Indicate Future [Text]	rr_PerformancePastDoesNotIndicateFuture	Past results (before and after taxes) are not predictive of future results.
Bar Chart [Heading]	rr_BarChartHeading	Calendar Year Total Returns For Class I Shares
Bar Chart Closing [Text Block]	rr_BarChartClosingTextBlock	Highest/Lowest quarterly results during this period were:Highest 18.35% (quarter ended 12/31/2020) Lowest -29.15% (quarter ended 3/31/2020)
Performance Table Heading	rr_PerformanceTableHeading	Average Annual Total Returns (For the period ended December 31, 2020)
Performance Table Uses Highest Federal Rate	rr_PerformanceTableUsesHighestFederalRate	After-tax returns are calculated using the highest individual federal income tax rates in effect each year and do not reflect the impact of state and local taxes.
Performance Table Not Relevant to Tax Deferred	rr_PerformanceTableNotRelevantToTaxDeferred	Your actual after-tax returns depend on your individual tax situation and likely will differ from the results shown above, and after-tax returns shown are not relevant if you hold your Fund shares through a tax-deferred arrangement, such as a 401(k) plan or individual retirement account (IRA).
Performance Table One Class of after Tax Shown [Text]	rr_PerformanceTableOneClassOfAfterTaxShown	After-tax returns are shown for only one class of shares, and after-tax returns for the other class of shares will vary.
Performance Table Narrative	rr_PerformanceTableNarrativeTextBlock	After-tax returns are calculated using the highest individual federal income tax rates in effect each year and do not reflect the impact of state and local taxes. Your actual after-tax returns depend on your individual tax situation and likely will differ from the results shown above, and after-tax returns shown are not relevant if you hold your Fund shares through a tax-deferred arrangement, such as a 401(k) plan or individual retirement account (IRA). After-tax returns are shown for only one class of shares, and after-tax returns for the other class of shares will vary.
TCW Relative Value Dividend Appreciation Fund | Class I
Risk/Return:	rr_RiskReturnAbstract
Shareholder Fees (Fees paid directly from your investment)	rr_ShareholderFeeOther	none
Management Fees	rr_ManagementFeesOverAssets	0.60%
Distribution and/or Service (12b-1) Fees	rr_DistributionAndService12b1FeesOverAssets	none
Other Expenses	rr_OtherExpensesOverAssets	0.15%
Total Annual Fund Operating Expenses	rr_ExpensesOverAssets	0.75%
Fee Waiver and/or Expense Reimbursement	rr_FeeWaiverOrReimbursementOverAssets	0.05%	[1]
Total Annual Operating Expenses After Fee Waiver and/or Expense Reimbursement	rr_NetExpensesOverAssets	0.70%	[1]
1 Year	rr_ExpenseExampleYear01	$ 72
3 Years	rr_ExpenseExampleYear03	235
5 Years	rr_ExpenseExampleYear05	412
10 Years	rr_ExpenseExampleYear10	$ 926
2011	rr_AnnualReturn2011	(1.78%)
2012	rr_AnnualReturn2012	20.73%
2013	rr_AnnualReturn2013	35.33%
2014	rr_AnnualReturn2014	9.84%
2015	rr_AnnualReturn2015	(4.76%)
2016	rr_AnnualReturn2016	16.68%
2017	rr_AnnualReturn2017	11.17%
2018	rr_AnnualReturn2018	(14.07%)
2019	rr_AnnualReturn2019	26.83%
2020	rr_AnnualReturn2020	4.07%
Highest Quarterly Return, Label	rr_HighestQuarterlyReturnLabel	Highest
Highest Quarterly Return, Date	rr_BarChartHighestQuarterlyReturnDate	Dec. 31, 2020
Highest Quarterly Return	rr_BarChartHighestQuarterlyReturn	18.35%
Lowest Quarterly Return, Label	rr_LowestQuarterlyReturnLabel	Lowest
Lowest Quarterly Return, Date	rr_BarChartLowestQuarterlyReturnDate	Mar. 31, 2020
Lowest Quarterly Return	rr_BarChartLowestQuarterlyReturn	(29.15%)
1 Year	rr_AverageAnnualReturnYear01	4.07%
5 Years	rr_AverageAnnualReturnYear05	7.93%
10 Years	rr_AverageAnnualReturnYear10	9.42%
TCW Relative Value Dividend Appreciation Fund | Class N
Risk/Return:	rr_RiskReturnAbstract
Shareholder Fees (Fees paid directly from your investment)	rr_ShareholderFeeOther	none
Management Fees	rr_ManagementFeesOverAssets	0.60%
Distribution and/or Service (12b-1) Fees	rr_DistributionAndService12b1FeesOverAssets	0.25%
Other Expenses	rr_OtherExpensesOverAssets	0.17%
Total Annual Fund Operating Expenses	rr_ExpensesOverAssets	1.02%
Fee Waiver and/or Expense Reimbursement	rr_FeeWaiverOrReimbursementOverAssets	0.12%	[1]
Total Annual Operating Expenses After Fee Waiver and/or Expense Reimbursement	rr_NetExpensesOverAssets	0.90%	[1]
1 Year	rr_ExpenseExampleYear01	$ 92
3 Years	rr_ExpenseExampleYear03	313
5 Years	rr_ExpenseExampleYear05	552
10 Years	rr_ExpenseExampleYear10	$ 1,237
1 Year	rr_AverageAnnualReturnYear01	3.88%
5 Years	rr_AverageAnnualReturnYear05	7.70%
10 Years	rr_AverageAnnualReturnYear10	9.14%
TCW Relative Value Dividend Appreciation Fund | After taxes on distributions | Class I
Risk/Return:	rr_RiskReturnAbstract
1 Year	rr_AverageAnnualReturnYear01	3.38%
5 Years	rr_AverageAnnualReturnYear05	6.54%
10 Years	rr_AverageAnnualReturnYear10	8.52%
TCW Relative Value Dividend Appreciation Fund | After taxes on distributions and sale of fund shares | Class I
Risk/Return:	rr_RiskReturnAbstract
1 Year	rr_AverageAnnualReturnYear01	2.73%
5 Years	rr_AverageAnnualReturnYear05	6.07%
10 Years	rr_AverageAnnualReturnYear10	7.62%
TCW Relative Value Dividend Appreciation Fund | Russell 1000® Value Index (reflects no deduction for fees, expenses or taxes)
Risk/Return:	rr_RiskReturnAbstract
1 Year	rr_AverageAnnualReturnYear01	2.80%	[2]
5 Years	rr_AverageAnnualReturnYear05	9.74%	[2]
10 Years	rr_AverageAnnualReturnYear10	10.50%	[2]

[1] The Fund’s investment advisor has agreed to waive fees and/or reimburse expenses to limit the Fund’s total annual operating expenses (excluding interest, brokerage, extraordinary expenses and acquired fund fees and expenses, if any) to 0.70% of average daily net assets with respect to Class I shares and 0.90% of average daily net assets with respect to Class N shares. This contractual fee waiver/expense reimbursement will remain in place through March 1, 2022 and before that date, the investment advisor may not terminate this arrangement without approval of the Board of Directors. At the conclusion of this period, the Fund’s investment advisor may, in its sole discretion, terminate the contractual fee waiver/expense reimbursement or, with the Board of Directors’ approval, extend or modify that arrangement.

[2] The Russell 1000^® Value Index measures the performance of those companies in the Russell 1000^® Index with lower price-to-book ratios and lower forecasted growth values.