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Earnings Per Share - Summary of Number of Shares Attributable to Equity Holders (Detail) - shares
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Weighted average ordinary shares and adjusted weighted average ordinary shares [abstract]        
Weighted average number of ordinary shares used to calculate basic earnings per share 134,562,177 105,557,517 134,517,869 105,553,573
Effect of other dilutive potential ordinary shares 4,471,455 1,146,397 4,515,005 1,150,819
Weighted average number of ordinary shares used to calculate diluted earnings per share 139,033,632 106,703,914 139,032,874 106,704,392