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Auditor's Remuneration Paid to Ernst & Young LLP - Summary of Auditor's Remuneration Paid (Parenthetical) (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2018
Auditor's remuneration [abstract]
Audit fees for specific procedures performed in relation to the implementation of new accounting standards		$ 0.4
Audit fee not yet incurred	$ 0.2

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- References

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- Definition

Audit fee not yet incurred.

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No definition available.

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- Definition

Audit fees for specific procedures performed in relation to the implementation of new accounting standards.

+ References

No definition available.

+ Details

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