Fair Value Measurement and Disclosures - Schedule of Quantitative Measures Used to Determine the Fair Values (Details) - ISQ Open Infrastructure Company LLC - Series II [Member]	9 Months Ended
	Dec. 31, 2025 USD ($)
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Valuation Methodology & Inputs	Discounted Cash Flow
Unobservable Input	Exit Multiple
Weighted Average	7.40%
Impact to Valuation from an Increase in Input	Increase
Equity Investments [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair Value	$ 167,053,547
Valuation Methodology & Inputs	Discounted Cash Flow
Unobservable Input	Discount Rate
Weighted Average	12.30%
Impact to Valuation from an Increase in Input	Decrease
Debt Investments [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair Value	$ 16,126,398
Valuation Methodology & Inputs	Discounted Cash Flow
Unobservable Input	Discount Rate
Weighted Average	10.40%
Impact to Valuation from an Increase in Input	Decrease
Minimum [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Range	5.00%
Minimum [Member] | Equity Investments [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Range	11.50%
Minimum [Member] | Debt Investments [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Range	9.00%
Maximum [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Range	15.00%
Maximum [Member] | Equity Investments [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Range	17.30%
Maximum [Member] | Debt Investments [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Range	13.00%