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Share Capital - Summary of Weighted Average Assumptions (Detail)
12 Months Ended
Dec. 31, 2018
yr
$ / shares
Disclosure of terms and conditions of share-based payment arrangement [abstract]  
Volatility in the price of the Company's shares 24.12%
Risk-free interest rate 2.10%
Expected hold period to exercise (years) | yr 3.50
Dividend yield 1.668%
Exercise price | $ / shares $ 32.98