v3.26.1
Related Party Transactions (Details) - USD ($)
3 Months Ended 6 Months Ended 9 Months Ended 12 Months Ended
Jun. 30, 2026
Mar. 31, 2026
Jun. 30, 2025
Jun. 30, 2025
Mar. 31, 2025
Jun. 30, 2026
Dec. 31, 2025
Dec. 31, 2025
Related Party Transactions [Line Items]                
Offering costs       $ 196,119        
ISQ Open Infrastructure Company LLC Series I [Member]                
Related Party Transactions [Line Items]                
Expenses           $ 198,020 $ 642,214  
Due from manager $ 275,614         275,614 476,948 $ 476,948
Expense 606,333         1,077,526 1,287,838  
Deferred offering costs 115,465 $ 57,732       115,465    
Manager support service           840,234    
ISQ Open Infrastructure Company LLC - Series II [Member]                
Related Party Transactions [Line Items]                
Due from manager 1,667,568         1,667,568 4,360,335 4,360,335
Deferred offering costs 441,226         441,226    
Unpaid management fee 556,484         $ 929,209    
Total Return attributable           100.00%    
Loss carryforward excess profits percentage           100.00%    
Manager equals percentage           12.50%    
Remaining excess profits percentage           12.50%    
Manager earned              
Due from manager 1,667,568         $ 1,667,568 4,360,335 4,360,335
accrued cost 278,813         278,813    
Organizational costs payable   0   1,657,772        
Offering cost payable     $ 1,411,303 1,411,303        
Incurred interest costs 560,668     0   1,151,137    
Manager support service           $ 10,781,807    
Manager support service           $304    
Payable to Manager       0   $ 3,719,797 849  
Affiliate investors contributed 2,744,000   0 0   $ 2,744,000    
Investor Shares Member] | ISQ Open Infrastructure Company LLC - Series II [Member]                
Related Party Transactions [Line Items]                
Total Return attributable           12.50%    
High Water Mark [Member] | ISQ Open Infrastructure Company LLC - Series II [Member]                
Related Party Transactions [Line Items]                
Total Return attributable           5.00%    
Performance Participation Allocation [Member] | ISQ Open Infrastructure Company LLC - Series II [Member]                
Related Party Transactions [Line Items]                
Manager earned 44,204         $ 1,712,216    
Expense Limitation Agreement [Member] | ISQ Open Infrastructure Company LLC - Series II [Member]                
Related Party Transactions [Line Items]                
Manager agreed to reimburse expenses 4,409,942           6,371,865  
Transport Equipment Network [Member] | ISQ Open Infrastructure Company LLC - Series II [Member]                
Related Party Transactions [Line Items]                
Transactions cost           22,420,955    
Entek Technology Holdings LLC [Member] | ISQ Open Infrastructure Company LLC - Series II [Member]                
Related Party Transactions [Line Items]                
Transactions cost           25,570,193    
Ezee Fiber Texas LLC [Member] | ISQ Open Infrastructure Company LLC - Series II [Member]                
Related Party Transactions [Line Items]                
Transactions cost           2,800,000    
Manager Support Services [Member] | ISQ Open Infrastructure Company LLC - Series II [Member]                
Related Party Transactions [Line Items]                
Manager support service           304    
Related Party [Member] | ISQ Open Infrastructure Company LLC Series I [Member]                
Related Party Transactions [Line Items]                
Organizational expenses cost     $ 656,241 1,854,336        
Manager support service         $ 97,847 100,173   642,214
Related Party [Member] | ISQ Open Infrastructure Company LLC - Series II [Member]                
Related Party Transactions [Line Items]                
Organizational expenses cost 0         590,533    
Manager support service   $ 2,017,077       2,392,865   6,371,865
Manager [Member] | ISQ Open Infrastructure Company LLC - Series II [Member]                
Related Party Transactions [Line Items]                
Organizational expenses cost 395,791         401,842    
Deferred offering costs 882,452         882,452    
Paid to manager              
Professional fees 553,554         940,150    
Investment related expenses [Member] | ISQ Open Infrastructure Company LLC - Series II [Member]                
Related Party Transactions [Line Items]                
Other expenses 412,002         553,255    
Series II acquired Liberty Tire Recycling LLC [Member] | ISQ Open Infrastructure Company LLC - Series II [Member]                
Related Party Transactions [Line Items]                
Portfolio from affiliates composed           40,195,508    
Cube Safety Holdco Limited [Member] | ISQ Open Infrastructure Company LLC - Series II [Member]                
Related Party Transactions [Line Items]                
Portfolio from affiliates composed           19,480,438    
Kio Networks [Member] | ISQ Open Infrastructure Company LLC - Series II [Member]                
Related Party Transactions [Line Items]                
Portfolio from affiliates composed           10,000,000    
ISQ Orchid Fund [Member] | ISQ Open Infrastructure Company LLC - Series II [Member]                
Related Party Transactions [Line Items]                
Portfolio from affiliates composed           18,000,000    
Expense Limitation and Reimbursement Agreement [Member] | ISQ Open Infrastructure Company LLC Series I [Member]                
Related Party Transactions [Line Items]                
Due from manager $ 275,614         $ 275,614 $ 476,948 $ 476,948
Maximum [Member] | Affiliated Entity [Member] | ISQ Open Infrastructure Company LLC Series I [Member]                
Related Party Transactions [Line Items]                
Percentage of net assets do not exceed           0.75%    
Maximum [Member] | Affiliated Entity [Member] | ISQ Open Infrastructure Company LLC - Series II [Member]                
Related Party Transactions [Line Items]                
Percentage of net assets do not exceed 0.75%              
Maximum [Member] | Expense Limitation and Reimbursement Agreement [Member] | Affiliated Entity [Member] | ISQ Open Infrastructure Company LLC Series I [Member]                
Related Party Transactions [Line Items]                
Percentage of net assets do not exceed           0.75%    
Maximum [Member] | Expense Limitation and Reimbursement Agreement [Member] | Affiliated Entity [Member] | ISQ Open Infrastructure Company LLC - Series II [Member]                
Related Party Transactions [Line Items]                
Percentage of net assets do not exceed 0.75%              
Class F-D Shares [Member] | ISQ Open Infrastructure Company LLC - Series II [Member]                
Related Party Transactions [Line Items]                
Management fee           0.75%    
Class S Shares [Member] | ISQ Open Infrastructure Company LLC - Series II [Member]                
Related Party Transactions [Line Items]                
Management fee           1.25%    
Operational Service Costs [Member] | ISQ Open Infrastructure Company LLC - Series II [Member]                
Related Party Transactions [Line Items]                
Manager support service       $ 0