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Loans and borrowings - Summary of Senior convertible notes (Detail) - USD ($)
$ in Thousands
 1 Months Ended 12 Months Ended
Apr. 30, 2020
Dec. 31, 2020
Disclosure of Detailed Information Of Senior Convertible Notes Explanatory [Line Items]    
Proceeds from Issue of Convertible Notes   $ 342,900
Senior Convertible Notes [Member]    
Disclosure of Detailed Information Of Senior Convertible Notes Explanatory [Line Items]    
Debt Instrument Maturity Date Apr. 15, 2025 Apr. 30, 2020
Nominal issue $ 350,000 $ 350,000
Borrowing costs recognised as expense   (7,102)
Proceeds from Issue of Convertible Notes   $ 342,898