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Earnings Per Share - Summary of Weighted Average Shares and Adjusted Weighted Average Shares (Detail) - shares
shares in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Weighted average ordinary shares and adjusted weighted average ordinary shares [abstract]    
Weighted average number of ordinary shares used in the calculation of basic earnings per share 753,565 716,587
Diluted impact of stock options   6
Weighted average number of ordinary shares used in the calculation of diluted earnings per share 753,565 716,593