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Loans and borrowings - Summary of Loans and borrowings (Detail) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
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%