Class R Shares [Member] Class I Shares [Member] Class Y Shares [Member] Investment Related Risks [Member] Closed-end Interval Fund [Member] General Infrastructure Investment Risks [Member] Public Infrastructure Risks [Member] Infrastructure Industry Concentration Risk [Member] Co-Investment Risks [Member] Risks of Regulation [Member] Infrastructure Valuation Risk [Member] Infrastructure Taxation [Member] Development Risks [Member] Concessions, Leases and Public Ways [Member] Energy Sector Risk [Member] Taxation [Member] Failure to Qualify as a RIC or Satisfy Distribution Requirement [Member] Difficulty Meeting RIC Requirements [Member] Corporate-Level Income Tax [Member] Changes in Tax Laws [Member] Prepayment Risk [Member] Follow-on Investments [Member] Commitment Strategy [Member] Control Positions [Member] Derivative Instruments and Hedging [Member] Inflation and Interest Risks [Member] Currency Risk [Member] Eurozone Risk [Member] Risks Relating to Accounting, Auditing and Financial Reporting, etc [Member] Investments in the Debt Securities of Small or Middle-Market Portfolio Companies Risk [Member] First Lien Senior Secured Loans, Second Lien Senior Secured Loans and Unitranche Debt Risk [Member] Mezzanine Investments Risk [Member] Risks Associated with Covenant-Lite Loans [Member] High Yield Securities and Distressed Securities Risk [Member] Risks Pertaining to Investments in Portfolio Funds [Member] Investments in the Portfolio Funds Generally; Dependence on the Portfolio Fund Managers [Member] Portfolio Funds are Not Registered [Member] Portfolio Funds are Generally Non-Diversified [Member] Portfolio Funds’ Securities are Generally Illiquid [Member] Portfolio Fund and SPV Operations Not Transparent [Member] Valuation of the Fund’s Interests in Portfolio Funds [Member] Multiple Levels of Fees and Expenses [Member] Inability to Vote [Member] Consortium or Offsetting Investments [Member] Limitations on Ability to Invest in Portfolio Funds [Member] Indemnification of Portfolio Funds and Portfolio Fund Managers [Member] Termination of the Fund’s Interest in a Portfolio Fund [Member] Risks Specific to Secondary Investments [Member] General Risks of Secondary Investments [Member] Non-Traditional Secondary Investments; Joint Investments; Other Investments [Member] Restrictions on Transfers of Secondary Interests [Member] Competition for Investments by Secondary Funds [Member] Limitations in Secondary Investments [Member] Business, Structure and Management Related Risks [Member] Reliance on the Adviser and Key Personnel [Member] Competition for Investment Opportunities [Member] Risks of Investing with Other Parties; Non-Controlling Investments [Member] Limited Information Concerning Potential Investments; Limited Availability of Information [Member] Fair Valuation for Portfolio Investments [Member] Amount or Frequency of Distributions Not Guaranteed [Member] Divergence of Resources [Member] Transactions with Affiliates [Member] Fluctuations in Performance [Member] General Risks [Member] Limited Operating History [Member] Repurchase Offer Risks [Member] Limited Liquidity; No Market for Shares [Member] Payment In-Kind for Repurchased Shares [Member] Non-Diversified Status [Member] Market Disruption and Geopolitical Risk [Member] Legal, Tax and Regulatory Risks [Member] Valuation Risk [Member] Substantial Repurchases [Member] Temporary Investments [Member] Cybersecurity Risk [Member] Regulatory Risks of Portfolio Funds [Member] Limits of Risks Disclosure [Member]