v3.26.1
Financial Highlights - Schedule of Financial Highlights (Details) - ISQ Open Infrastructure Company LLC - Series I [Member] - USD ($)
 6 Months Ended
Jun. 30, 2026
Mar. 31, 2026
Dec. 31, 2025
F-STE Shares [Member]      
Per Share Data:      
Net asset value at beginning of period $ 30.05    
Premium/(Discount) on issuance of shares 1.84    
Distributions declared [1] (0.79)    
Service fees (1.51)    
Net investment income [2] (0.3)    
Net realized and unrealized gain/(loss) [3] 1.26    
Reallocation of unrealized gain/(loss) 0.46    
Net increase (decrease) in net assets resulting from operations 1.42    
Net asset value at end of period $ 31.01    
Shares outstanding at end of period (in Shares) 1,225,853 517,755 107,654
Weighted average shares outstanding (in Shares) 766,822    
Ratio/Supplemental Data:      
Net assets at end of period (in Dollars) $ 38,019,759   $ 3,235,263
Total expenses before expense support [4],[5] 8.27%    
Total expenses after expense support [4],[5] 4.22%    
Net investment loss (in Shares) [5] (1.9)    
Total return [6] 5.83%    
F-DTE Shares [Member]      
Per Share Data:      
Net asset value at beginning of period $ 32.12    
Premium/(Discount) on issuance of shares 0    
Distributions declared [1] (0.79)    
Service fees 0.01    
Net investment income [2] (0.65)    
Net realized and unrealized gain/(loss) [3] 1.63    
Reallocation of unrealized gain/(loss) (0.79)    
Net increase (decrease) in net assets resulting from operations 0.19    
Net asset value at end of period $ 31.53    
Shares outstanding at end of period (in Shares) 405,809 401,563 400,110
Weighted average shares outstanding (in Shares) 402,745    
Ratio/Supplemental Data:      
Net assets at end of period (in Dollars) $ 12,795,774   $ 12,853,300
Total expenses before expense support [4],[5] 10.79%    
Total expenses after expense support [4],[5] 6.64%    
Net investment loss (in Shares) [5] (4.16)    
Total return [6] 0.63%    
F-ITE Shares [Member]      
Per Share Data:      
Net asset value at beginning of period $ 32.16    
Premium/(Discount) on issuance of shares (0.24)    
Distributions declared [1] (0.79)    
Service fees    
Net investment income [2] (0.18)    
Net realized and unrealized gain/(loss) [3] 1.29    
Reallocation of unrealized gain/(loss) (0.04)    
Net increase (decrease) in net assets resulting from operations 1.07    
Net asset value at end of period $ 32.2    
Shares outstanding at end of period (in Shares) 154,274 72,324 41,020
Weighted average shares outstanding (in Shares) 89,811    
Ratio/Supplemental Data:      
Net assets at end of period (in Dollars) $ 4,967,794   $ 1,319,365
Total expenses before expense support [4],[5] 7.76%    
Total expenses after expense support [4],[5] 3.65%    
Net investment loss (in Shares) [5] (1.15)    
Total return [6] 2.59%    
F-JTE Shares [Member]      
Per Share Data:      
Net asset value at beginning of period $ 31.38    
Premium/(Discount) on issuance of shares (0.03)    
Distributions declared [1] (0.79)    
Service fees (0.1)    
Net investment income [2] (0.59)    
Net realized and unrealized gain/(loss) [3] 1.58    
Reallocation of unrealized gain/(loss) (0.12)    
Net increase (decrease) in net assets resulting from operations 0.87    
Net asset value at end of period $ 31.33    
Shares outstanding at end of period (in Shares) 749,143 708,472 578,956
Weighted average shares outstanding (in Shares) 709,456    
Ratio/Supplemental Data:      
Net assets at end of period (in Dollars) $ 23,473,964   $ 18,167,268
Total expenses before expense support [4],[5] 10.43%    
Total expenses after expense support [4],[5] 6.25%    
Net investment loss (in Shares) [5] (3.78)    
Total return [6] 2.37%    
STE Shares [Member]      
Per Share Data:      
Net asset value at beginning of period $ 31.47    
Premium/(Discount) on issuance of shares 0    
Distributions declared [1] (0.79)    
Service fees 0.06    
Net investment income [2] (0.72)    
Net realized and unrealized gain/(loss) [3] 1.48    
Reallocation of unrealized gain/(loss) (0.73)    
Net increase (decrease) in net assets resulting from operations 0.03    
Net asset value at end of period $ 30.77    
Shares outstanding at end of period (in Shares) 110 110 110
Weighted average shares outstanding (in Shares) 110    
Ratio/Supplemental Data:      
Net assets at end of period (in Dollars) $ 3,385   $ 3,462
Total expenses before expense support [4],[5] 10.87%    
Total expenses after expense support [4],[5] 7.01%    
Net investment loss (in Shares) [5] (4.69)    
Total return [6] 0.29%    
DTE Shares [Member]      
Per Share Data:      
Net asset value at beginning of period $ 32.15    
Premium/(Discount) on issuance of shares (0.01)    
Distributions declared [1] (0.79)    
Service fees 0.02    
Net investment income [2] (0.67)    
Net realized and unrealized gain/(loss) [3] 1.48    
Reallocation of unrealized gain/(loss) (0.73)    
Net increase (decrease) in net assets resulting from operations 0.08    
Net asset value at end of period $ 31.45    
Shares outstanding at end of period (in Shares) 110 110 110
Weighted average shares outstanding (in Shares) 110    
Ratio/Supplemental Data:      
Net assets at end of period (in Dollars) $ 3,460   $ 3,537
Total expenses before expense support [4],[5] 10.33%    
Total expenses after expense support [4],[5] 6.56%    
Net investment loss (in Shares) [5] (4.3)    
Total return [6] 0.29%    
ITE Shares [Member]      
Per Share Data:      
Net asset value at beginning of period $ 32.44    
Premium/(Discount) on issuance of shares (0.01)    
Distributions declared [1] (0.79)    
Service fees    
Net investment income [2] (0.65)    
Net realized and unrealized gain/(loss) [3] 1.49    
Reallocation of unrealized gain/(loss) (0.73)    
Net increase (decrease) in net assets resulting from operations 0.11    
Net asset value at end of period $ 31.75    
Shares outstanding at end of period (in Shares) 110 110 110
Weighted average shares outstanding (in Shares) 110    
Ratio/Supplemental Data:      
Net assets at end of period (in Dollars) $ 3,492   $ 3,568
Total expenses before expense support [4],[5] 10.12%    
Total expenses after expense support [4],[5] 6.38%    
Net investment loss (in Shares) [5] (4.14)    
Total return [6] 0.32%    
JTE Shares [Member]      
Per Share Data:      
Net asset value at beginning of period $ 31.87    
Premium/(Discount) on issuance of shares 3.34    
Distributions declared [1] (0.79)    
Service fees (3.01)    
Net investment income [2] (0.32)    
Net realized and unrealized gain/(loss) [3] 0.34    
Reallocation of unrealized gain/(loss)    
Net increase (decrease) in net assets resulting from operations 0.02    
Net asset value at end of period $ 31.43    
Shares outstanding at end of period (in Shares) 86,453 110 110
Weighted average shares outstanding (in Shares) 17,884    
Ratio/Supplemental Data:      
Net assets at end of period (in Dollars) $ 2,717,147   $ 3,506
Total expenses before expense support [4],[5] 10.14%    
Total expenses after expense support [4],[5] 5.75%    
Net investment loss (in Shares) [5] (2.05)    
Total return [6] 1.11%    
ETE Shares [Member]      
Per Share Data:      
Net asset value at beginning of period $ 33.36    
Premium/(Discount) on issuance of shares 0.05    
Distributions declared [1] (0.79)    
Service fees    
Net investment income [2] (0.11)    
Net realized and unrealized gain/(loss) [3] 0.83    
Reallocation of unrealized gain/(loss) (0.39)    
Net increase (decrease) in net assets resulting from operations 0.33    
Net asset value at end of period $ 32.95    
Shares outstanding at end of period (in Shares) 81 80 80
Weighted average shares outstanding (in Shares) 80    
Ratio/Supplemental Data:      
Net assets at end of period (in Dollars) $ 2,669   $ 2,669
Total expenses before expense support [4],[5] 3.93%    
Total expenses after expense support [4],[5] 1.89%    
Net investment loss (in Shares) [5] (0.68)    
Total return [6] 1.15%    
[1] The per share data for distributions was derived by using the actual shares outstanding at the date of the relevant transaction (refer to Note 4).
[2] The per share data was derived by using the weighted average shares outstanding during the applicable period.
[3] The amount shown at this caption is the balancing amount derived from the other figures in the table. The amount shown at this caption for a share outstanding throughout the period may not agree with the change in the aggregate gains and losses in investments for the period because of the timing of sales of Series I shares in relation to fluctuating market value for the portfolio.
[4] Actual results may not be indicative of future results. Additionally, an individual shareholder's ratio may vary from the ratios presented for a share class as a whole.
[5] The ratios were derived using the simple average net assets during the applicable period.
[6] The total return is calculated for each share class as the change in the net asset value for such share class during the period plus any distributions per share declared in the period, and assumes any distributions are reinvested in accordance with our distribution reinvestment plan. The Series I performance changes over time and currently may be different than that shown above. Past performance is no guarantee of future results. Investment performance is presented without regard to sales load that may be incurred by Shareholders in the purchase of the Series I shares.