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Loans and borrowings - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands | 1 Months Ended | 12 Months Ended
--- | --- | ---
Apr. 30, 2020 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Disclosure of detailed information about borrowings [line items] |  |  |  |
Debt including current maturities |  | $ 1,163,900 | $ 1,060,765 |
Support from Export-Import Bank for net purchase price of aircraft |  | 80.00% |  |
Net change in fair value of derivatives |  | $ (107,139) | 0 | $ 0
Export-Import Bank of United States [member] |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Outstanding indebtedness |  | 160,700 | 227,300 |
Borrowing on which fixed applicable interest rate is exercised |  | $ 83,600 | 128,100 |
Senior Convertible Notes [Member] |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Debt Instrument Maturity Date | Apr. 15, 2025 | Apr. 30, 2020 |  |
Description of conversion ratio of senior convertible notes |  | The initial conversion rate is 19.3564 shares per $1,000 principal amount of notes |  |
Conversion price per principal amount |  | $ 51.66 |  |
Net change in fair value of derivatives |  | $ (107,100) |  |
Borrowing interest rate | 4.50% |  |  |
Nominal Issue | $ 350,000 | 350,000 |  |
Fair Value |  | 245,600 |  |
Fair value of the embedded derivative at initial recognition | $ 138,400 |  |  |
Finance lease [member] | Fixed interest rate [member] |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Debt including current maturities |  | 579,700 | 608,300 |
Finance lease [member] | Floating interest rate [member] |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Debt including current maturities |  | $ 202,600 | $ 225,200 |

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