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Issued Capital - Movement of Ordinary Shares Issued (Detail) - shares
shares in Thousands
 12 Months Ended
Aug. 15, 2018
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Disclosure of classes of share capital [line items]        
Capital reduction       0
Ordinary shares [member]        
Disclosure of classes of share capital [line items]        
Beginning balance   727,265 856,059 856,754
Restricted shares – cancelled   (25) (349) (542)
Restricted shares – uncancelled     (23) (153)
Capital reduction 132,945   (128,422)  
Ending balance   727,240 727,265 856,059