v3.26.3
Borrowings - Additional Information (Detail) - BXINFRA Aggregator (CYM) L.P. - USD ($)
3 Months Ended 9 Months Ended 12 Months Ended
Jan. 26, 2026
Oct. 09, 2025
Sep. 30, 2026
Sep. 30, 2026
Dec. 31, 2025
Mar. 03, 2025
Aggregator Credit Agreement | Line of Credit            
Debt Instrument [Line Items]            
Maximum borrowing capacity $ 400,000,000.0   $ 1,000,000,000.0 $ 1,000,000,000.0    
First Unused Amount            
Debt Instrument [Line Items]            
Unused commitment fee percentage       1.00%    
Second Unused Amount            
Debt Instrument [Line Items]            
Unused commitment fee percentage       0.30%    
Brentwood Credit Facility            
Debt Instrument [Line Items]            
Maximum borrowing capacity           $ 300,000,000.0
Variable rate     0.30%      
Maximum amount outstanding       $ 0 $ 0  
Brentwood Credit Facility | SOFR            
Debt Instrument [Line Items]            
Variable rate     1.35%      
Jutland Credit Facility            
Debt Instrument [Line Items]            
Maximum borrowing capacity   $ 150,000,000.0        
Unused commitment fee percentage   0.45%        
Maximum amount outstanding       $ 60,000,000.0 $ 70,000,000.0  
Interest rate       5.24% 5.15%  
Interest rate percentage   1.45%        
Minimum utilization percentage one   40.00%        
Minimum utilization percentage two   50.00%        
Minimum utilization percentage three   65.00%        
Average utilization fee   1.45%        
Aggregator Credit Agreement            
Debt Instrument [Line Items]            
Interest rate 22.50%          
Default rate increase percentage 2.50%          
Aggregator Credit Agreement | SOFR            
Debt Instrument [Line Items]            
Variable rate 3.00%          
Aggregator Credit Agreement | Base Rate            
Debt Instrument [Line Items]            
Variable rate 2.00%          
Aggregator Credit Agreement | Minimum            
Debt Instrument [Line Items]            
Unused commitment fee percentage 0.45%          
Aggregator Credit Agreement | Maximum            
Debt Instrument [Line Items]            
Unused commitment fee percentage 0.65%