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Loans and borrowings - Additional Information (Detail) $ in Thousands |  | 12 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 18, 2023 USD ($) shares | Dec. 31, 2025 USD ($) | Dec. 31, 2024 USD ($) | Dec. 31, 2023 USD ($) shares | Jul. 14, 2023 shares | Apr. 30, 2020 USD ($)
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |
Debt including current maturities |  | $ 1,980,441 | $ 1,670,807 |  |  |
Conversion ratio per $1,000 principal amount of Notes (in shares) | shares |  |  |  |  | 0.0201603 |
Share settlement convertible notes |  |  |  | $ 349,495 |  |
Shares settlement convertible notes, not converted by holders | $ 349,000 |  |  |  |  |
Remeasurement of convertible notes |  |  |  | 87,900 |  |
Net change in fair value of derivatives |  | $ (4,325) | 4,469 | $ (98,347) |  |
Class A common stock |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |
Share settlement convertible notes (in shares) | shares | (3,700,000) |  |  | (3,694,845) |  |
Bottom of range |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |
Support from Export-Import Bank for net purchase price of aircraft |  | 80.00% |  |  |  |
Top of range |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |
Support from Export-Import Bank for net purchase price of aircraft |  | 85.00% |  |  |  |
Export-Import Bank of United States |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |
Outstanding indebtedness |  | $ 336,100 | 376,700 |  |  |
Senior Convertible Notes |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |
Principal amount |  |  |  |  |  | $ 350,000
Effective interest rates of borrowings |  |  |  |  |  | 4.50%
Number of trading days immediately before maturity date |  |  |  |  |  | 40 days
Conversion price percentage |  |  |  |  |  | 1.30
Percentage redemption price on convertible notes | 1 |  |  |  |  |
Shares settlement convertible notes, not converted by holders | $ 1,000 |  |  |  |  |
Fair value of the embedded derivative at initial recognition |  |  |  | $ 98,300 |  |
Finance lease | Long term fixed rate debt |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |
Debt including current maturities |  | 726,800 | 700,700 |  |  |
Finance lease | Long term variable rate debt |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |
Debt including current maturities |  | $ 917,500 | $ 593,400 |  |  |

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