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Equity - Additional Information (Detail)
shares in Thousands
 12 Months Ended
Dec. 31, 2017
$ / shares
$ / shares
shares
Oct. 13, 2017
shares
Jul. 13, 2017
shares
Dec. 31, 2016
shares
Disclosure of classes of share capital [line items]        
Par value of ordinary shares issued | $ / shares $ 10      
Shares included in authorized shares not yet completed share registration process 500,000     500,000
Number of ordinary shares issued   323,094 101,164  
Percentage of legal reserve 10.00%      
Percentage of legal reserve on share capital 25.00%      
Percentage of ordinary shares repurchased 1.53%      
Average repurchase price per share | $ / shares $ 44.45      
Converted bonds [member]        
Disclosure of classes of share capital [line items]        
Ordinary shares issued under conversion of Bonds 424,258      
Top of range [member]        
Disclosure of classes of share capital [line items]        
Percentage of cash dividend on dividend distribution 30.00%      
Number of ordinary shares approved for repurchase 120,000      
American depository shares (ADs) [member]        
Disclosure of classes of share capital [line items]        
Number of shares represented by each ADS 5      
Number of shares outstanding 115,261     125,518
Ordinary shares [member]        
Disclosure of classes of share capital [line items]        
Number of shares outstanding 576,305     627,590
Cash capital increase [member]        
Disclosure of classes of share capital [line items]        
Number of ordinary shares issued 300,000      
Share price | $ / shares $ 34.3