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Share-Based Compensation - Summary of Movements in Shares (Detail)
 6 Months Ended
Jun. 30, 2019
shares
Disclosure of movement of potential shares [line items]  
Potential Shares, Beginning balance 4,455,601
Potential Shares, Granted 1,974,638
Potential Shares, Over performance 21,802
Potential Shares, Vested (856,224)
Potential Shares, Forfeited (99,543)
Potential Shares, Ending balance 5,496,274
Performance-Based RSU [member]  
Disclosure of movement of potential shares [line items]  
Potential Shares, Beginning balance 3,085,164
Potential Shares, Granted 1,028,342
Potential Shares, Over performance 21,802
Potential Shares, Vested (807,665)
Potential Shares, Forfeited (78,806)
Potential Shares, Ending balance 3,248,837
Restricted Stock Units [member]  
Disclosure of movement of potential shares [line items]  
Potential Shares, Beginning balance 1,312,524
Potential Shares, Granted 899,926
Potential Shares, Vested (6,000)
Potential Shares, Forfeited (20,737)
Potential Shares, Ending balance 2,185,713
Equity Awards Plans [member]  
Disclosure of movement of potential shares [line items]  
Potential Shares, Beginning balance 57,913
Potential Shares, Granted 46,370
Potential Shares, Vested (42,559)
Potential Shares, Ending balance 61,724