v3.25.4
Net Assets - Summary of the Aggregate Distributions Declared and Payable (Detail) - Unit Distribution [Member]
12 Months Ended
Dec. 31, 2025
$ / shares
March 31, 2025  
Distribution Made to Limited Partner [Line Items]  
Distribution Made to Limited Partner, Declaration Date Apr. 29, 2025
Distribution Made to Limited Partner, Date of Record Mar. 31, 2025 [1]
Distribution Made to Limited Partner, Distribution Date May 02, 2025
March 31, 2025 | BXINFRA Aggregator CYM LP [Member]  
Distribution Made to Limited Partner [Line Items]  
Distribution Made to Limited Partner, Declaration Date Apr. 29, 2025
Distribution Made to Limited Partner, Date of Record Mar. 31, 2025 [1]
Distribution Made to Limited Partner, Distribution Date May 02, 2025
June 30, 2025  
Distribution Made to Limited Partner [Line Items]  
Distribution Made to Limited Partner, Declaration Date Jul. 29, 2025
Distribution Made to Limited Partner, Date of Record Jun. 30, 2025 [2]
Distribution Made to Limited Partner, Distribution Date Aug. 01, 2025
June 30, 2025 | BXINFRA Aggregator CYM LP [Member]  
Distribution Made to Limited Partner [Line Items]  
Distribution Made to Limited Partner, Declaration Date Jul. 29, 2025
Distribution Made to Limited Partner, Date of Record Jun. 30, 2025 [2]
Distribution Made to Limited Partner, Distribution Date Aug. 01, 2025
September 30, 2025  
Distribution Made to Limited Partner [Line Items]  
Distribution Made to Limited Partner, Declaration Date Oct. 22, 2025
Distribution Made to Limited Partner, Date of Record Sep. 30, 2025 [2]
Distribution Made to Limited Partner, Distribution Date Nov. 03, 2025
September 30, 2025 | BXINFRA Aggregator CYM LP [Member]  
Distribution Made to Limited Partner [Line Items]  
Distribution Made to Limited Partner, Declaration Date Oct. 22, 2025
Distribution Made to Limited Partner, Date of Record Sep. 30, 2025 [2]
Distribution Made to Limited Partner, Distribution Date Nov. 03, 2025
December 31, 2025  
Distribution Made to Limited Partner [Line Items]  
Distribution Made to Limited Partner, Declaration Date Jan. 28, 2026
Distribution Made to Limited Partner, Date of Record Dec. 31, 2025 [2]
Distribution Made to Limited Partner, Distribution Date Feb. 04, 2026
December 31, 2025 | BXINFRA Aggregator CYM LP [Member]  
Distribution Made to Limited Partner [Line Items]  
Distribution Made to Limited Partner, Declaration Date Jan. 28, 2026
Distribution Made to Limited Partner, Date of Record Dec. 31, 2025 [2]
Distribution Made to Limited Partner, Distribution Date Feb. 04, 2026
Class I Units [Member]  
Distribution Made to Limited Partner [Line Items]  
Distributions per Unit $ 0.7146
Class I Units [Member] | March 31, 2025  
Distribution Made to Limited Partner [Line Items]  
Distributions per Unit 0.0958
Class I Units [Member] | June 30, 2025  
Distribution Made to Limited Partner [Line Items]  
Distributions per Unit 0.1998
Class I Units [Member] | September 30, 2025  
Distribution Made to Limited Partner [Line Items]  
Distributions per Unit 0.1996
Class I Units [Member] | December 31, 2025  
Distribution Made to Limited Partner [Line Items]  
Distributions per Unit 0.2194
Class S Units [Member]  
Distribution Made to Limited Partner [Line Items]  
Distributions per Unit 0.7146
Class S Units [Member] | March 31, 2025  
Distribution Made to Limited Partner [Line Items]  
Distributions per Unit 0.0958
Class S Units [Member] | June 30, 2025  
Distribution Made to Limited Partner [Line Items]  
Distributions per Unit 0.1998
Class S Units [Member] | September 30, 2025  
Distribution Made to Limited Partner [Line Items]  
Distributions per Unit 0.1996
Class S Units [Member] | December 31, 2025  
Distribution Made to Limited Partner [Line Items]  
Distributions per Unit 0.2194
Class D Units [Member]  
Distribution Made to Limited Partner [Line Items]  
Distributions per Unit 0.7146
Class D Units [Member] | March 31, 2025  
Distribution Made to Limited Partner [Line Items]  
Distributions per Unit 0.0958
Class D Units [Member] | June 30, 2025  
Distribution Made to Limited Partner [Line Items]  
Distributions per Unit 0.1998
Class D Units [Member] | September 30, 2025  
Distribution Made to Limited Partner [Line Items]  
Distributions per Unit 0.1996
Class D Units [Member] | December 31, 2025  
Distribution Made to Limited Partner [Line Items]  
Distributions per Unit 0.2194
Class A Units [Member] | BXINFRA Aggregator CYM LP [Member]  
Distribution Made to Limited Partner [Line Items]  
Distributions per Unit 0.7162
Class A Units [Member] | March 31, 2025 | BXINFRA Aggregator CYM LP [Member]  
Distribution Made to Limited Partner [Line Items]  
Distributions per Unit 0.0962
Class A Units [Member] | June 30, 2025 | BXINFRA Aggregator CYM LP [Member]  
Distribution Made to Limited Partner [Line Items]  
Distributions per Unit 0.2
Class A Units [Member] | September 30, 2025 | BXINFRA Aggregator CYM LP [Member]  
Distribution Made to Limited Partner [Line Items]  
Distributions per Unit 0.2
Class A Units [Member] | December 31, 2025 | BXINFRA Aggregator CYM LP [Member]  
Distribution Made to Limited Partner [Line Items]  
Distributions per Unit $ 0.22
[1] To unitholders of record immediately following the close of business.
[2] To unitholders of record as of the open of business.