v3.25.4
Investments and Fair Value Measurement - Summary of Fair Value Assets Measured on Recurring Basis Unobservable Input Reconciliation (Detail) - BXINFRA Aggregator (CYM) L.P. [Member]
$ in Thousands
 12 Months Ended
Dec. 31, 2025
USD ($)
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]  
Balance, Beginning of Period $ 0
Purchases 2,669,479
Sales and Proceeds from Investments (28,667)
Transfer Out of Level III 0 [1]
Change in Gain Included in Net Assets 384,342
Balance, End of Period 3,025,154
Changes in Unrealized Gain (Loss) Included in Earnings Related to Financial Assets Still Held at the Reporting Date $ 384,342
Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] Gain (Loss), Investment and Derivative, Operating, and Foreign Currency Transaction, before Tax
Fair Value, Asset, Recurring Basis, Unobservable Input Reconciliation, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] Gain (Loss), Investment and Derivative, Operating, and Foreign Currency Transaction, before Tax
Equity Investments [Member]  
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]  
Balance, Beginning of Period $ 0
Purchases 1,827,077
Sales and Proceeds from Investments (11,176)
Transfer Out of Level III 0 [1]
Change in Gain Included in Net Assets 225,512
Balance, End of Period 2,041,413
Changes in Unrealized Gain (Loss) Included in Earnings Related to Financial Assets Still Held at the Reporting Date 225,512
Infrastructure Debt Investment [Member]  
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]  
Balance, Beginning of Period 0
Purchases 140,914
Sales and Proceeds from Investments (3,510)
Transfer Out of Level III 0 [1]
Change in Gain Included in Net Assets 69,769
Balance, End of Period 207,173
Changes in Unrealized Gain (Loss) Included in Earnings Related to Financial Assets Still Held at the Reporting Date 69,769
Investments in Affiliates [Member]  
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]  
Balance, Beginning of Period 0
Purchases 701,488
Sales and Proceeds from Investments (13,981)
Transfer Out of Level III 0 [1]
Change in Gain Included in Net Assets 89,061
Balance, End of Period 776,568
Changes in Unrealized Gain (Loss) Included in Earnings Related to Financial Assets Still Held at the Reporting Date $ 89,061
[1] The transfers out of Level III financial assets were primarily due to a change of observability of inputs used in the valuations of such assets.