v3.26.3
Investments and Fair Value Measurement - Schedule of Valuation of Aggregator's Investments (Details) - BXINFRA Aggregator (CYM) L.P. - USD ($)
Sep. 30, 2026
Dec. 31, 2025
Assets    
Total Cash and Cash Equivalents $ 112,822,000 $ 64,744,000
Equity Investments 3,571,431,000 2,072,698,000
Debt Investments 1,420,735,000 1,166,894,000
Total Investments 4,992,166,000 3,239,592,000
Investments in Affiliated Investee Funds 2,077,385,000 920,479,000
Derivative Assets 12,204,000 143,000
Total assets, fair value 7,194,577,000 4,224,958,000
Liabilities    
Derivative Liabilities 180,000 265,000
Debt Investments - Infrastructure    
Assets    
Debt Investments 951,667,000 698,531,000
Debt Investment - Liquid    
Assets    
Debt Investments 469,068,000 468,363,000
Level I    
Assets    
Total Cash and Cash Equivalents 112,822,000 64,744,000
Equity Investments 0 0
Debt Investments 0 0
Total Investments 0 0
Investments in Affiliated Investee Funds 0 18,866,000
Derivative Assets 0 0
Total assets, fair value 112,822,000 83,610,000
Liabilities    
Derivative Liabilities 0 0
Level I | Debt Investments - Infrastructure    
Assets    
Debt Investments 0 0
Level I | Debt Investment - Liquid    
Assets    
Debt Investments 0 0
Level II    
Assets    
Total Cash and Cash Equivalents 0 0
Equity Investments 0 31,285,000
Debt Investments 1,169,462,000 959,721,000
Total Investments 1,169,462,000 991,006,000
Investments in Affiliated Investee Funds 0 55,268,000
Derivative Assets 12,204,000 143,000
Total assets, fair value 1,181,666,000 1,046,417,000
Liabilities    
Derivative Liabilities 180,000 265,000
Level II | Debt Investments - Infrastructure    
Assets    
Debt Investments 709,732,000 491,358,000
Level II | Debt Investment - Liquid    
Assets    
Debt Investments 459,730,000 468,363,000
Level III    
Assets    
Total Cash and Cash Equivalents 0 0
Equity Investments 3,571,431,000 2,041,413,000
Debt Investments 251,273,000 207,173,000
Total Investments 3,822,704,000 2,248,586,000
Investments in Affiliated Investee Funds 0 776,568,000
Derivative Assets 0 0
Total assets, fair value 3,822,704,000 3,025,154,000
Liabilities    
Derivative Liabilities 0 0
Level III | Debt Investments - Infrastructure    
Assets    
Debt Investments 241,935,000 207,173,000
Level III | Debt Investment - Liquid    
Assets    
Debt Investments 9,338,000 0
NAV    
Assets    
Total Cash and Cash Equivalents 0 0
Equity Investments 0 0
Debt Investments 0 0
Total Investments 0 0
Investments in Affiliated Investee Funds 2,077,385,000 69,777,000
Derivative Assets 0 0
Total assets, fair value 2,077,385,000 69,777,000
Liabilities    
Derivative Liabilities 0 0
NAV | Debt Investments - Infrastructure    
Assets    
Debt Investments 0 0
NAV | Debt Investment - Liquid    
Assets    
Debt Investments 0 0
Cash Held at Banks    
Assets    
Total Cash and Cash Equivalents 97,599,000 51,262,000
Cash Held at Banks | Level I    
Assets    
Total Cash and Cash Equivalents 97,599,000 51,262,000
Cash Held at Banks | Level II    
Assets    
Total Cash and Cash Equivalents 0 0
Cash Held at Banks | Level III    
Assets    
Total Cash and Cash Equivalents 0 0
Cash Held at Banks | NAV    
Assets    
Total Cash and Cash Equivalents 0 0
Money Market Fund    
Assets    
Total Cash and Cash Equivalents 15,223,000 13,482,000
Money Market Fund | Level I    
Assets    
Total Cash and Cash Equivalents 15,223,000 13,482,000
Money Market Fund | Level II    
Assets    
Total Cash and Cash Equivalents 0 0
Money Market Fund | Level III    
Assets    
Total Cash and Cash Equivalents 0 0
Money Market Fund | NAV    
Assets    
Total Cash and Cash Equivalents $ 0 $ 0