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Related Party Transactions (Details) - USD ($)			9 Months Ended
Related Party Transactions (Details) - USD ($)	Oct. 03, 2025	Oct. 02, 2025	Dec. 31, 2025
ISQ Open Infrastructure Company LLC - Series I [Member]
Related Party Considerations [Line Items]
Expenses			$ 642,214
Due from manager			476,948
Expense			1,287,838
Organizational expenses cost			328,197
Organizational costs payable			268,457
Offering costs			221,784
Deferred offering costs			48,587
Other expenses			1,000
Offering costs			48,587
Professional fees			288,945
ISQ Open Infrastructure Company LLC - Series II [Member]
Related Party Considerations [Line Items]
Due from manager			4,360,335
Organizational expenses cost			2,867,509
Organizational costs payable			2,559,348
Offering costs			1,734,837
Deferred offering costs			411,159
Unpaid management fee			$ 212,689
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			4,360,335
accrued cost			372,221
Other expenses			464,045
Organizational costs payable			2,559,348
Offering costs			411,159
Portfolio from affiliates composed	$ 80,653,445	$ 80,653,445
Transactions cost			4,014,224
Incurred interest costs			1,563,143
Manager support service			6,371,865
Payable to Manager			849
Professional fees			1,935,077
Affiliate investors contributed			$ 9,641,438
Investor Shares Member] \| ISQ Open Infrastructure Company LLC - Series II [Member]
Related Party Considerations [Line Items]
Total Return attributable			12.50%
High Water Mark [Member] \| ISQ Open Infrastructure Company LLC - Series II [Member]
Related Party Considerations [Line Items]
Total Return attributable			5.00%
Performance Participation Allocation [Member] \| ISQ Open Infrastructure Company LLC - Series II [Member]
Related Party Considerations [Line Items]
Manager earned			$ 3,415,609
Expense Limitation Agreement [Member] \| ISQ Open Infrastructure Company LLC - Series II [Member]
Related Party Considerations [Line Items]
Manager agreed to reimburse expenses			6,371,865
National Express LLC [Member] \| ISQ Open Infrastructure Company LLC - Series II [Member]
Related Party Considerations [Line Items]
Transactions cost			455,820
ENTEK Technology Holdings LLC [Member] \| ISQ Open Infrastructure Company LLC - Series II [Member]
Related Party Considerations [Line Items]
Transactions cost			6,645,179
Matterhorn Express Pipeline LLC [Member] \| ISQ Open Infrastructure Company LLC - Series II [Member]
Related Party Considerations [Line Items]
Transactions cost			13,331,455
Manager [Member] \| ISQ Open Infrastructure Company LLC - Series II [Member]
Related Party Considerations [Line Items]
Organizational expenses cost			77,126
Paid to manager			0
Other expenses			12,312
Offering costs			2,145,996
Manager support service			849
Professional fees			218,888
Investment related expenses [Member] \| ISQ Open Infrastructure Company LLC - Series II [Member]
Related Party Considerations [Line Items]
Other expenses			$ 372,221
Class F-D Shares [Member] \| ISQ Open Infrastructure Company LLC - Series II [Member]
Related Party Considerations [Line Items]
Management fee			0.75%
Class S Shares [Member] \| ISQ Open Infrastructure Company LLC - Series II [Member]
Related Party Considerations [Line Items]
Management fee			1.25%
Maximum [Member] \| Affiliated Entity [Member] \| ISQ Open Infrastructure Company LLC - Series I [Member]
Related Party Considerations [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 Considerations [Line Items]
Percentage of net assets do not exceed			0.75%
Maximum [Member] \| Affiliated Entity [Member] \| Expense Limitation and Reimbursement Agreement [Member] \| ISQ Open Infrastructure Company LLC - Series I [Member]
Related Party Considerations [Line Items]
Percentage of net assets do not exceed			0.75%
Maximum [Member] \| Affiliated Entity [Member] \| Expense Limitation and Reimbursement Agreement [Member] \| ISQ Open Infrastructure Company LLC - Series II [Member]
Related Party Considerations [Line Items]
Percentage of net assets do not exceed			0.75%