Institutional [Member] Investment Risks - Institutional - Harding Loevner Frontier Emerging Markets Portfolio |
Oct. 31, 2025 |
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| Currency Risk [Member] | |
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| Risk [Text Block] | Currency Risk. Foreign currencies may experience steady or sudden devaluation relative to the U.S. dollar, adversely affecting the value of the Portfolio’s investments. Because the Portfolio’s net asset value is determined on the basis of U.S. dollars, if the local currency of a foreign market depreciates against the U.S. dollar, you may lose money even if the foreign market prices of the Portfolio’s holdings rise.
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| Foreign Investment Risk [Member] | |
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| Risk [Text Block] | Foreign Investment Risk. Securities issued by foreign entities involve risks not associated with U.S. investments. These risks include additional taxation, political, economic, social, geopolitical or diplomatic instability, and the above-mentioned possibility of changes in foreign currency exchange rates. There may also be less publicly-available information about a foreign issuer. Such risks may be magnified with respect to securities of issuers in frontier emerging markets.
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| Frontier Emerging Market Risk [Member] | |
| Prospectus [Line Items] | |
| Risk [Text Block] | Frontier Emerging Market Risk. Frontier emerging market securities involve certain risks, such as exposure to economies less diverse and mature than that of the United States or more established foreign markets. Economic or political instability may cause larger price changes in frontier emerging market securities than in securities of issuers based in more developed foreign countries, including securities of issuers based in larger emerging markets. Frontier emerging markets generally receive less investor attention than developed markets and larger emerging markets.
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| Concentration Risk [Member] | |
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| Risk [Text Block] | Concentration Risk. The Portfolio may invest up to 35% of its total assets in securities of companies in any one industry if, at the time of investment, that industry represents 20% or more of the Portfolio’s benchmark index, currently the MSCI Frontier Emerging Markets Index. Accordingly, at any time the Portfolio has such a concentration of investments in a single industry group, it will be particularly vulnerable to factors that adversely affect that industry group.
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| Large Shareholder Transactions Risk [Member] | |
| Prospectus [Line Items] | |
| Risk [Text Block] | Large Shareholder Transactions Risk. A Portfolio may experience adverse effects when certain large shareholders, such as other funds, institutional investors (including those trading by use of non-discretionary mathematical formulas), financial intermediaries (who may make investment decisions on behalf of underlying clients and/or include the Portfolio in their investment model), individuals, accounts and affiliates of Harding Loevner, purchase or redeem large amounts of shares of the Portfolio. Such large shareholder redemptions, which may occur rapidly or unexpectedly, may cause a Portfolio to sell portfolio securities at times when it would not otherwise do so, which may negatively impact the Portfolio’s NAV and liquidity. Similarly, large Portfolio share purchases may adversely affect a Portfolio’s performance to the extent that the Portfolio is delayed in investing new cash or otherwise maintains a larger cash position than it ordinarily would. These transactions may also accelerate the realization of taxable income to shareholders if such sales of investments resulted in gains, and may also increase transaction costs. In addition, a large redemption could result in a Portfolio’s current expenses being allocated over a smaller asset base, leading to an increase in the Portfolio’s expense ratio.
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| NAV Risk [Member] | |
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| Risk [Text Block] | NAV Risk. The net asset value of the Portfolio and the value of your investment will fluctuate.
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| Financials Sector Risk [Member] | |
| Prospectus [Line Items] | |
| Risk [Text Block] | Financials Sector Risk. The Portfolio is vulnerable to events affecting companies in the financials sector. Examples of risks affecting the financials sector include changes in governmental regulation, issues relating to the availability and cost of capital, changes in interest rates and/or monetary policy, bank failures and price competition. In addition, financials companies are often more highly leveraged than other companies, making them inherently riskier. As of October 31, 2025, the Portfolio had 36.1] of net assets invested in the financials sector.
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| Depositary Receipts Risk [Member] | |
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| Risk [Text Block] | Depositary Receipts Risk. ADRs as well as other forms of depositary receipts, including EDRs and GDRs, are certificates evidencing ownership of shares of a foreign issuer. These certificates are issued by depository banks and generally trade on an established market in the United States or elsewhere. The underlying shares are held in trust by a custodian bank or similar financial institution in the issuer’s home country. ADRs, EDRs and GDRs are alternatives to directly purchasing the underlying foreign securities in their national markets. However, ADRs, EDRs, and GDRs are subject to many of the risks associated with investing directly in foreign securities, including currency risk and the political, economic, and social risks of the underlying issuer’s country.
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| Market Risks [Member] | |
| Prospectus [Line Items] | |
| Risk [Text Block] | Market Risk. The value of investments in the Portfolio may fluctuate suddenly and unexpectedly as a result of various market and economic factors, including those affecting individual companies, issuers or particular industries.
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| Risk Lose Money [Member] | |
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| Risk [Text Block] | The Portfolio is subject to numerous risks, any of which could cause an investor to lose money. |