v3.26.1
Fair Value Measurement and Disclosures - Schedule of Investments and Derivatives Intruments in the Fair Value Hierarchy (Details) - ISQ Open Infrastructure Company LLC - Series II [Member] - USD ($)
Jun. 30, 2026
Dec. 31, 2025
Investments and derivative instruments at fair value    
Total Investments and derivative instruments at fair value $ 331,871,581 $ 183,179,945
Equity Investments [Member]    
Investments and derivative instruments at fair value    
Total Investments and derivative instruments at fair value 312,005,843 167,053,547
Debt Investments [Member]    
Investments and derivative instruments at fair value    
Total Investments and derivative instruments at fair value 19,890,343 16,126,398
Derivative Assets [Member]    
Investments and derivative instruments at fair value    
Derivative Liabilities (24,605)  
Level I [Member]    
Investments and derivative instruments at fair value    
Total Investments and derivative instruments at fair value
Level I [Member] | Equity Investments [Member]    
Investments and derivative instruments at fair value    
Total Investments and derivative instruments at fair value
Level I [Member] | Debt Investments [Member]    
Investments and derivative instruments at fair value    
Total Investments and derivative instruments at fair value
Level I [Member] | Derivative Assets [Member]    
Investments and derivative instruments at fair value    
Derivative Liabilities  
Level II [Member]    
Investments and derivative instruments at fair value    
Total Investments and derivative instruments at fair value (24,605)
Level II [Member] | Equity Investments [Member]    
Investments and derivative instruments at fair value    
Total Investments and derivative instruments at fair value
Level II [Member] | Debt Investments [Member]    
Investments and derivative instruments at fair value    
Total Investments and derivative instruments at fair value
Level II [Member] | Derivative Assets [Member]    
Investments and derivative instruments at fair value    
Derivative Liabilities (24,605)  
Level III [Member]    
Investments and derivative instruments at fair value    
Total Investments and derivative instruments at fair value 331,896,186 183,179,945
Level III [Member] | Equity Investments [Member]    
Investments and derivative instruments at fair value    
Total Investments and derivative instruments at fair value 312,005,843 167,053,547
Level III [Member] | Debt Investments [Member]    
Investments and derivative instruments at fair value    
Total Investments and derivative instruments at fair value 19,890,343 $ 16,126,398
Level III [Member] | Derivative Assets [Member]    
Investments and derivative instruments at fair value    
Derivative Liabilities