Lease Accounting - Schedule of Aggregate Lease Costs by Lease Classification (Parenthetical) (Detail) - USD ($) $ in Millions |
3 Months Ended | 9 Months Ended | ||||
|---|---|---|---|---|---|---|
Sep. 30, 2026 |
Sep. 30, 2025 |
Sep. 30, 2026 |
Sep. 30, 2025 |
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| Lease Cost [Line Items] | ||||||
| Lease payments | $ 210.1 | $ 204.2 | ||||
| Equipment | Location, Statement of Income, Balance [Axis]: us-gaap:OtherCostAndExpenseOperating | ||||||
| Lease Cost [Line Items] | ||||||
| Short term lease payments | $ 1.2 | $ 1.0 | 3.3 | 2.9 | ||
| Real Estate | Location, Statement of Income, Balance [Axis]: cnk:FacilityLeaseExpense | ||||||
| Lease Cost [Line Items] | ||||||
| Variable lease payments | [1] | 22.4 | 15.6 | 56.2 | 45.1 | |
| Office and equipment leases | Location, Statement of Income, Balance [Axis]: us-gaap:GeneralAndAdministrativeExpense | ||||||
| Lease Cost [Line Items] | ||||||
| Lease payments | $ 0.5 | $ 0.4 | $ 1.3 | $ 1.1 | ||
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