Blackstone Alternative Multi-Strategy Fund S000045538 [Member] HFRX Global Hedge Fund Index (reflects no deductions for fees, expenses, or taxes) HFRX Global Hedge Fund Index [Member] MSCI World Index TR (reflects no deductions for fees, expenses, or taxes) MSCI World Index TR [Member] Bloomberg Global Aggregate Bond Index (reflects no deductions for fees, expenses, or taxes) Bloomberg Global Aggregate Bond Index [Member] Class I C000141764 [Member] Class D Shares C000145025 [Member] Class R Shares C000145026 [Member] Class Y Shares C000145027 [Member] Equity Securities Risk [Member] Derivatives Risks [Member] Debt Securities Risk [Member] Counterparty Credit Risk [Member] Liquidity Risk [Member] Inflation Risk [Member] Short Sales Risk [Member] Risks Specific to Investments in Investment Funds [Member] California Carbon Allowance CCA Futures Risk [Member] Mortgage and Asset Backed Securities Risk [Member] Commodities Related Investments Risk [Member] Structured Products Risk [Member] Real Estate and REIT Investment Risk [Member] Foreign Investments and Emerging Markets Risk [Member] Event Driven Trading Risk [Member] Sovereign Debt Risk [Member] Collateralized Debt Obligations Risk [Member] Leverage Risk [Member] Below Investment Grade Instruments Risk [Member] Investment Company and ETF Risk [Member] TBA Risk [Member] New Issue Risk [Member] Loan Risk [Member] Special Purpose Acquisition Company SPAC Risk [Member] Warrants and Rights Risk [Member] Relative Value Strategies Risk [Member] Market Capitalization Risk [Member] Arbitrage Strategies Risk [Member] Distressed Securities Risk [Member] Bankruptcy Process and Trade Claims Risk [Member] Macro Strategy Risk [Member] Focused Investment Risk [Member] Convertible Securities Risk [Member] Non Exchange Traded Securities Risk [Member] Government Issued Securities Risk [Member] Repurchase Agreements Risk [Member] Event Linked Instrument Risk [Member] Activist Strategies Risk [Member] Allocation Risk [Member] Multi Manager Risk [Member] Large Purchase or Redemption Risk [Member] Conflicts of Interest Risk [Member] Limitations on Transactions with Affiliates [Member] Cybersecurity Risk [Member] AI Technologies Developments Risk [Member] Valuation Risk [Member] Tax Risk [Member] Model and Technology Risk [Member] Regulatory Risk [Member] Long Short Strategies Risk [Member] Hedging Transactions Risk [Member] High Portfolio Turnover Risk [Member] Limited Capacity Risk [Member] Risk Control Framework Risk [Member] Subsidiary Risk [Member] Borrowing Risk [Member] Investment Style Risk [Member] Defensive Investing Risk [Member] Systematic Trading Risk [Member] Securities Lending Risk [Member] Market Risk and Selection Risk [Member]