Financial Highlights - Schedule of Financial Highlights (Details) - ISQ Open Infrastructure Company LLC - Series II [Member] - USD ($)		9 Months Ended
		Dec. 31, 2025	Mar. 27, 2025
ETE Shares [Member]
Per Share Data:
Net asset value at beginning of period
Distributions declared	[1]
Proceeds from issuance of shares		25
Premium/(Discount) on issuance of shares		0.01
Service fees
Net investment loss	[2]	(0.13)
Net realized and unrealized gain/(loss)	[3]	8.72
Net increase in net assets resulting from operations		33.6
Net asset value at end of period		$ 33.6
Shares outstanding at end of period (in Shares)		40
Weighted average shares outstanding (in Shares)		40
Ratio/Supplemental Data:
Net assets at end of period (in Dollars)		$ 1,344
Total expenses before expense support and after performance participation allocation	[4],[5],[6]	6.92%
Total expenses after expense support and after performance participation allocation	[4],[5],[6]	0.84%
Total expenses after expense support and before performance participation allocation	[4],[5],[6]	0.84%
Net investment loss	[5],[6]	(0.42%)
Total return	[5],[7]	34.40%
DTE Shares [Member]
Per Share Data:
Net asset value at beginning of period
Distributions declared	[1]
Proceeds from issuance of shares		25
Premium/(Discount) on issuance of shares
Service fees		(0.3)
Net investment loss	[2]	(1.23)
Net realized and unrealized gain/(loss)	[3]	8.65
Net increase in net assets resulting from operations		32.12
Net asset value at end of period		$ 32.12
Shares outstanding at end of period (in Shares)		100
Weighted average shares outstanding (in Shares)		100
Ratio/Supplemental Data:
Net assets at end of period (in Dollars)		$ 3,212
Total expenses before expense support and after performance participation allocation	[4],[5],[6]	10.72%
Total expenses after expense support and after performance participation allocation	[4],[5],[6]	4.59%
Total expenses after expense support and before performance participation allocation	[4],[5],[6]	1.22%
Net investment loss	[5],[6]	(4.18%)
Total return	[5],[7]	28.48%
ITE Shares [Member]
Per Share Data:
Net asset value at beginning of period
Distributions declared	[1]
Proceeds from issuance of shares		25
Premium/(Discount) on issuance of shares		(0.01)
Service fees
Net investment loss	[2]	(1.21)
Net realized and unrealized gain/(loss)	[3]	8.65
Net increase in net assets resulting from operations		32.43
Net asset value at end of period		$ 32.43
Shares outstanding at end of period (in Shares)		100
Weighted average shares outstanding (in Shares)		100
Ratio/Supplemental Data:
Net assets at end of period (in Dollars)		$ 3,243
Total expenses before expense support and after performance participation allocation	[4],[5],[6]	10.62%
Total expenses after expense support and after performance participation allocation	[4],[5],[6]	4.51%
Total expenses after expense support and before performance participation allocation	[4],[5],[6]	1.15%
Net investment loss	[5],[6]	(4.11%)
Total return	[5],[7]	29.72%
JTE Shares [Member]
Per Share Data:
Net asset value at beginning of period
Distributions declared	[1]
Proceeds from issuance of shares		25
Premium/(Discount) on issuance of shares		(0.01)
Service fees		(0.59)
Net investment loss	[2]	(1.24)
Net realized and unrealized gain/(loss)	[3]	8.64
Net increase in net assets resulting from operations		31.8
Net asset value at end of period		$ 31.8
Shares outstanding at end of period (in Shares)		100
Weighted average shares outstanding (in Shares)		100
Ratio/Supplemental Data:
Net assets at end of period (in Dollars)		$ 3,180
Total expenses before expense support and after performance participation allocation	[4],[5],[6]	10.78%
Total expenses after expense support and after performance participation allocation	[4],[5],[6]	4.64%
Total expenses after expense support and before performance participation allocation	[4],[5],[6]	1.26%
Net investment loss	[5],[6]	(4.23%)
Total return	[5],[7]	27.20%
STE Shares [Member]
Per Share Data:
Net asset value at beginning of period
Distributions declared	[1]
Proceeds from issuance of shares		25
Premium/(Discount) on issuance of shares
Service fees		(1.01)
Net investment loss	[2]	(1.27)
Net realized and unrealized gain/(loss)	[3]	8.64
Net increase in net assets resulting from operations		31.36
Net asset value at end of period		$ 31.36
Shares outstanding at end of period (in Shares)		100
Weighted average shares outstanding (in Shares)		100
Ratio/Supplemental Data:
Net assets at end of period (in Dollars)		$ 3,136
Total expenses before expense support and after performance participation allocation	[4],[5],[6]	10.92%
Total expenses after expense support and after performance participation allocation	[4],[5],[6]	4.76%
Total expenses after expense support and before performance participation allocation	[4],[5],[6]	1.37%
Net investment loss	[5],[6]	(4.35%)
Total return	[5],[7]	25.44%
F-STE Shares [Member]
Per Share Data:
Net asset value at beginning of period
Distributions declared	[1]
Proceeds from issuance of shares		25
Premium/(Discount) on issuance of shares		0.91
Service fees		(1.85)
Net investment loss	[2]	(1.08)
Net realized and unrealized gain/(loss)	[3]	7.56
Net increase in net assets resulting from operations		30.54
Net asset value at end of period		$ 30.54
Shares outstanding at end of period (in Shares)		105,792
Weighted average shares outstanding (in Shares)		62,711
Ratio/Supplemental Data:
Net assets at end of period (in Dollars)		$ 3,231,299
Total expenses before expense support and after performance participation allocation	[4],[5],[6]	9.40%
Total expenses after expense support and after performance participation allocation	[4],[5],[6]	5.05%
Total expenses after expense support and before performance participation allocation	[4],[5],[6]	1.36%
Net investment loss	[5],[6]	(4.60%)
Total return	[5],[7]	22.16%
F-ITE Shares [Member]
Per Share Data:
Net asset value at beginning of period
Distributions declared	[1]
Proceeds from issuance of shares		25
Premium/(Discount) on issuance of shares		(0.17)
Service fees
Net investment loss	[2]	(1.14)
Net realized and unrealized gain/(loss)	[3]	8.75
Net increase in net assets resulting from operations		32.44
Net asset value at end of period		$ 32.44
Shares outstanding at end of period (in Shares)		40,677
Weighted average shares outstanding (in Shares)		32,144
Ratio/Supplemental Data:
Net assets at end of period (in Dollars)		$ 1,319,688
Total expenses before expense support and after performance participation allocation	[4],[5],[6]	10.83%
Total expenses after expense support and after performance participation allocation	[4],[5],[6]	5.21%
Total expenses after expense support and before performance participation allocation	[4],[5],[6]	1.26%
Net investment loss	[5],[6]	(4.73%)
Total return	[5],[7]	29.76%
F-JTE Shares [Member]
Per Share Data:
Net asset value at beginning of period
Distributions declared	[1]
Proceeds from issuance of shares		25
Premium/(Discount) on issuance of shares		0.08
Service fees		(0.87)
Net investment loss	[2]	(1.15)
Net realized and unrealized gain/(loss)	[3]	8.67
Net increase in net assets resulting from operations		31.73
Net asset value at end of period		$ 31.73
Shares outstanding at end of period (in Shares)		572,307
Weighted average shares outstanding (in Shares)		408,021
Ratio/Supplemental Data:
Net assets at end of period (in Dollars)		$ 18,158,680
Total expenses before expense support and after performance participation allocation	[4],[5],[6]	9.91%
Total expenses after expense support and after performance participation allocation	[4],[5],[6]	5.23%
Total expenses after expense support and before performance participation allocation	[4],[5],[6]	1.40%
Net investment loss	[5],[6]	(4.77%)
Total return	[5],[7]	26.92%
F-DTE Shares [Member]
Per Share Data:
Net asset value at beginning of period
Distributions declared	[1]
Proceeds from issuance of shares		25
Premium/(Discount) on issuance of shares		(0.08)
Service fees		(0.3)
Net investment loss	[2]	(1.17)
Net realized and unrealized gain/(loss)	[3]	8.74
Net increase in net assets resulting from operations		32.19
Net asset value at end of period		$ 32.19
Shares outstanding at end of period (in Shares)		400,100
Weighted average shares outstanding (in Shares)		395,799
Ratio/Supplemental Data:
Net assets at end of period (in Dollars)		$ 12,878,001
Total expenses before expense support and after performance participation allocation	[4],[5],[6]	13.31%
Total expenses after expense support and after performance participation allocation	[4],[5],[6]	5.54%
Total expenses after expense support and before performance participation allocation	[4],[5],[6]	1.40%
Net investment loss	[5],[6]	(5.00%)
Total return	[5],[7]	28.76%
E Shares [Member]
Per Share Data:
Net asset value at beginning of period
Distributions declared	[1]
Proceeds from issuance of shares		25
Premium/(Discount) on issuance of shares		(0.1)
Service fees
Net investment loss	[2]	(0.13)
Net realized and unrealized gain/(loss)	[3]	8.8
Net increase in net assets resulting from operations		33.57
Net asset value at end of period		$ 33.57
Shares outstanding at end of period (in Shares)		377,933
Weighted average shares outstanding (in Shares)		351,196
Ratio/Supplemental Data:
Net assets at end of period (in Dollars)		$ 12,685,360
Total expenses before expense support and after performance participation allocation	[4],[5],[6]	5.98%
Total expenses after expense support and after performance participation allocation	[4],[5],[6]	0.80%
Total expenses after expense support and before performance participation allocation	[4],[5],[6]	0.80%
Net investment loss	[5],[6]	(0.41%)
Total return	[5],[7]	34.28%
F-S Shares [Member]
Per Share Data:
Net asset value at beginning of period
Distributions declared	[1]
Proceeds from issuance of shares		25
Premium/(Discount) on issuance of shares		0.31
Service fees		(1.54)
Net investment loss	[2]	(1.06)
Net realized and unrealized gain/(loss)	[3]	7.41
Net increase in net assets resulting from operations		30.12
Net asset value at end of period		$ 30.12
Shares outstanding at end of period (in Shares)		448,694
Weighted average shares outstanding (in Shares)		308,316
Ratio/Supplemental Data:
Net assets at end of period (in Dollars)		$ 13,513,460
Total expenses before expense support and after performance participation allocation	[4],[5],[6]	8.52%
Total expenses after expense support and after performance participation allocation	[4],[5],[6]	3.91%
Total expenses after expense support and before performance participation allocation	[4],[5],[6]	1.21%
Net investment loss	[5],[6]	(3.54%)
Total return	[5],[7]	20.48%
F-I Shares [Member]
Per Share Data:
Net asset value at beginning of period
Distributions declared	[1]
Proceeds from issuance of shares		25
Premium/(Discount) on issuance of shares		(0.19)
Service fees
Net investment loss	[2]	(1.09)
Net realized and unrealized gain/(loss)	[3]	8.35
Net increase in net assets resulting from operations		32.07
Net asset value at end of period		$ 32.07
Shares outstanding at end of period (in Shares)		207,668
Weighted average shares outstanding (in Shares)		176,433
Ratio/Supplemental Data:
Net assets at end of period (in Dollars)		$ 6,660,049
Total expenses before expense support and after performance participation allocation	[4],[5],[6]	9.01%
Total expenses after expense support and after performance participation allocation	[4],[5],[6]	3.91%
Total expenses after expense support and before performance participation allocation	[4],[5],[6]	0.97%
Net investment loss	[5],[6]	(3.53%)
Total return	[5],[7]	28.28%
F-J Shares [Member]
Per Share Data:
Net asset value at beginning of period
Distributions declared	[1]
Proceeds from issuance of shares		25
Premium/(Discount) on issuance of shares		(0.09)
Service fees		(0.72)
Net investment loss	[2]	(1.12)
Net realized and unrealized gain/(loss)	[3]	8.26
Net increase in net assets resulting from operations		31.33
Net asset value at end of period		$ 31.33
Shares outstanding at end of period (in Shares)		2,862,789
Weighted average shares outstanding (in Shares)		2,408,621
Ratio/Supplemental Data:
Net assets at end of period (in Dollars)		$ 89,697,782
Total expenses before expense support and after performance participation allocation	[4],[5],[6]	9.26%
Total expenses after expense support and after performance participation allocation	[4],[5],[6]	4.07%
Total expenses after expense support and before performance participation allocation	[4],[5],[6]	1.13%
Net investment loss	[5],[6]	(3.69%)
Total return	[5],[7]	25.32%

[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 7).

[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 II 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] Not annualized.

[6] The ratios were derived using the simple average net assets during the applicable period.

[7] 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. Amounts are not representative of total return as calculated for purposes of the Performance Participation Allocation as described in Note 6. The Series II 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 II shares.