Share-based Payment Expense - Summary of Fair Value Assumptions (Detail) - 2014 Performance Share Plan [member]	12 Months Ended
Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Disclosure Of Share Based Compensation Expense [line items]
Risk-free interest rate	(0.56%)	(0.61%)	(0.37%)
Expected volatility	35.10%	22.10%	23.20%

Risk free interest rate, other equity instruments granted.

No definition available.

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Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration