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Loans and borrowings - Summary of Loans and borrowings (Detail) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
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Disclosure of detailed information about borrowings [line items] |  |
Debt including current maturities | $ 1,163,900 | $ 1,060,765
Current maturities | (127,946) | (122,582)
Loans and borrowings long-term | 1,035,954 | 938,183
Borrowing due through 2029 [member] | Fixed interest rate [member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Debt including current maturities | 663,293 | 736,790
Borrowing due through 2029 [member] | Floating interest rate [member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Debt including current maturities | 279,778 | $ 323,975
Senior Convertible Notes Due Through 2025 [Member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Debt including current maturities | $ 220,829 |
Effective interest rates of borrowings | 14.68% |
Bottom of range [member] | Borrowing due through 2029 [member] | Fixed interest rate [member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Effective interest rates of borrowings | 1.49% | 1.49%
Bottom of range [member] | Borrowing due through 2029 [member] | Floating interest rate [member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Effective interest rates of borrowings | 0.42% | 2.15%
Top of range [member] | Borrowing due through 2029 [member] | Fixed interest rate [member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Effective interest rates of borrowings | 4.45% | 4.90%
Top of range [member] | Borrowing due through 2029 [member] | Floating interest rate [member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Effective interest rates of borrowings | 1.66% | 3.50%

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