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Equity - Summary of Equity Share Capital (Parenthetical) (Detail) | Dec. 31, 2021 £ / shares | Dec. 31, 2020 £ / shares | Dec. 31, 2019 $ / shares | Dec. 31, 2018 $ / shares
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Ordinary shares [Member] | Equity share capital [member] |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |
Nominal value per share | (per share) | £ 0.20852 | £ 0.20852 | $ 0.20852 | $ 0.19810

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